Project import
diff --git a/giflib/Android.mk b/giflib/Android.mk
new file mode 100644
index 0000000..427c1ee
--- /dev/null
+++ b/giflib/Android.mk
@@ -0,0 +1,18 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_SDK_VERSION := 9
+
+LOCAL_SRC_FILES := \
+ dgif_lib.c \
+ egif_lib.c \
+ gifalloc.c \
+ gif_err.c \
+ gif_hash.c \
+ quantize.c
+
+LOCAL_CFLAGS += -Wno-format -Wno-sign-compare -Wno-unused-parameter -DHAVE_CONFIG_H
+LOCAL_SDK_VERSION := 8
+LOCAL_MODULE:= libgif
+
+include $(BUILD_STATIC_LIBRARY)
diff --git a/giflib/CleanSpec.mk b/giflib/CleanSpec.mk
new file mode 100644
index 0000000..b84e1b6
--- /dev/null
+++ b/giflib/CleanSpec.mk
@@ -0,0 +1,49 @@
+# Copyright (C) 2007 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# If you don't need to do a full clean build but would like to touch
+# a file or delete some intermediate files, add a clean step to the end
+# of the list. These steps will only be run once, if they haven't been
+# run before.
+#
+# E.g.:
+# $(call add-clean-step, touch -c external/sqlite/sqlite3.h)
+# $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/STATIC_LIBRARIES/libz_intermediates)
+#
+# Always use "touch -c" and "rm -f" or "rm -rf" to gracefully deal with
+# files that are missing or have been moved.
+#
+# Use $(PRODUCT_OUT) to get to the "out/target/product/blah/" directory.
+# Use $(OUT_DIR) to refer to the "out" directory.
+#
+# If you need to re-do something that's already mentioned, just copy
+# the command and add it to the bottom of the list. E.g., if a change
+# that you made last week required touching a file and a change you
+# made today requires touching the same file, just copy the old
+# touch step and add it to the end of the list.
+#
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
+
+# For example:
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/APPS/AndroidTests_intermediates)
+#$(call add-clean-step, rm -rf $(OUT_DIR)/target/common/obj/JAVA_LIBRARIES/core_intermediates)
+#$(call add-clean-step, find $(OUT_DIR) -type f -name "IGTalkSession*" -print0 | xargs -0 rm -f)
+#$(call add-clean-step, rm -rf $(PRODUCT_OUT)/data/*)
+
+# ************************************************
+# NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST
+# ************************************************
diff --git a/giflib/MODULE_LICENSE_MIT b/giflib/MODULE_LICENSE_MIT
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/giflib/MODULE_LICENSE_MIT
diff --git a/giflib/NOTICE b/giflib/NOTICE
new file mode 100644
index 0000000..b9c0b50
--- /dev/null
+++ b/giflib/NOTICE
@@ -0,0 +1,19 @@
+The GIFLIB distribution is Copyright (c) 1997 Eric S. Raymond
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/giflib/config.h b/giflib/config.h
new file mode 100644
index 0000000..3193a1b
--- /dev/null
+++ b/giflib/config.h
@@ -0,0 +1,13 @@
+
+// giflib config.h
+
+#ifndef GIF_CONFIG_H_DEFINED
+#define GIF_CONFIG_H_DEFINED
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <fcntl.h>
+
+typedef uint32_t UINT32;
+
+#endif
diff --git a/giflib/dgif_lib.c b/giflib/dgif_lib.c
new file mode 100644
index 0000000..744a2f9
--- /dev/null
+++ b/giflib/dgif_lib.c
@@ -0,0 +1,1168 @@
+/******************************************************************************
+
+dgif_lib.c - GIF decoding
+
+The functions here and in egif_lib.c are partitioned carefully so that
+if you only require one of read and write capability, only one of these
+two modules will be linked. Preserve this property!
+
+*****************************************************************************/
+
+#include <stdlib.h>
+#include <limits.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef _WIN32
+#include <io.h>
+#endif /* _WIN32 */
+
+#include "gif_lib.h"
+#include "gif_lib_private.h"
+
+/* compose unsigned little endian value */
+#define UNSIGNED_LITTLE_ENDIAN(lo, hi) ((lo) | ((hi) << 8))
+
+/* avoid extra function call in case we use fread (TVT) */
+#define READ(_gif,_buf,_len) \
+ (((GifFilePrivateType*)_gif->Private)->Read ? \
+ ((GifFilePrivateType*)_gif->Private)->Read(_gif,_buf,_len) : \
+ fread(_buf,1,_len,((GifFilePrivateType*)_gif->Private)->File))
+
+static int DGifGetWord(GifFileType *GifFile, GifWord *Word);
+static int DGifSetupDecompress(GifFileType *GifFile);
+static int DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line,
+ int LineLen);
+static int DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode);
+static int DGifDecompressInput(GifFileType *GifFile, int *Code);
+static int DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf,
+ GifByteType *NextByte);
+
+/******************************************************************************
+ Open a new GIF file for read, given by its name.
+ Returns dynamically allocated GifFileType pointer which serves as the GIF
+ info record.
+******************************************************************************/
+GifFileType *
+DGifOpenFileName(const char *FileName, int *Error)
+{
+ int FileHandle;
+ GifFileType *GifFile;
+
+ if ((FileHandle = open(FileName, O_RDONLY)) == -1) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_OPEN_FAILED;
+ return NULL;
+ }
+
+ GifFile = DGifOpenFileHandle(FileHandle, Error);
+ // cppcheck-suppress resourceLeak
+ return GifFile;
+}
+
+/******************************************************************************
+ Update a new GIF file, given its file handle.
+ Returns dynamically allocated GifFileType pointer which serves as the GIF
+ info record.
+******************************************************************************/
+GifFileType *
+DGifOpenFileHandle(int FileHandle, int *Error)
+{
+ char Buf[GIF_STAMP_LEN + 1];
+ GifFileType *GifFile;
+ GifFilePrivateType *Private;
+ FILE *f;
+
+ GifFile = (GifFileType *)malloc(sizeof(GifFileType));
+ if (GifFile == NULL) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ (void)close(FileHandle);
+ return NULL;
+ }
+
+ /*@i1@*/memset(GifFile, '\0', sizeof(GifFileType));
+
+ /* Belt and suspenders, in case the null pointer isn't zero */
+ GifFile->SavedImages = NULL;
+ GifFile->SColorMap = NULL;
+
+ Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
+ if (Private == NULL) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ (void)close(FileHandle);
+ free((char *)GifFile);
+ return NULL;
+ }
+#ifdef _WIN32
+ _setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */
+#endif /* _WIN32 */
+
+ f = fdopen(FileHandle, "rb"); /* Make it into a stream: */
+
+ /*@-mustfreeonly@*/
+ GifFile->Private = (void *)Private;
+ Private->FileHandle = FileHandle;
+ Private->File = f;
+ Private->FileState = FILE_STATE_READ;
+ Private->Read = NULL; /* don't use alternate input method (TVT) */
+ GifFile->UserData = NULL; /* TVT */
+ /*@=mustfreeonly@*/
+
+ /* Let's see if this is a GIF file: */
+ if (READ(GifFile, (unsigned char *)Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_READ_FAILED;
+ (void)fclose(f);
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ /* Check for GIF prefix at start of file */
+ Buf[GIF_STAMP_LEN] = 0;
+ if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_GIF_FILE;
+ (void)fclose(f);
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
+ (void)fclose(f);
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ GifFile->Error = 0;
+
+ /* What version of GIF? */
+ Private->gif89 = (Buf[GIF_VERSION_POS] == '9');
+
+ return GifFile;
+}
+
+/******************************************************************************
+ GifFileType constructor with user supplied input function (TVT)
+******************************************************************************/
+GifFileType *
+DGifOpen(void *userData, InputFunc readFunc, int *Error)
+{
+ char Buf[GIF_STAMP_LEN + 1];
+ GifFileType *GifFile;
+ GifFilePrivateType *Private;
+
+ GifFile = (GifFileType *)malloc(sizeof(GifFileType));
+ if (GifFile == NULL) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+ memset(GifFile, '\0', sizeof(GifFileType));
+
+ /* Belt and suspenders, in case the null pointer isn't zero */
+ GifFile->SavedImages = NULL;
+ GifFile->SColorMap = NULL;
+
+ Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
+ if (!Private) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ GifFile->Private = (void *)Private;
+ Private->FileHandle = 0;
+ Private->File = NULL;
+ Private->FileState = FILE_STATE_READ;
+
+ Private->Read = readFunc; /* TVT */
+ GifFile->UserData = userData; /* TVT */
+
+ /* Lets see if this is a GIF file: */
+ if (READ(GifFile, (unsigned char *)Buf, GIF_STAMP_LEN) != GIF_STAMP_LEN) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_READ_FAILED;
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ /* Check for GIF prefix at start of file */
+ Buf[GIF_STAMP_LEN] = '\0';
+ if (strncmp(GIF_STAMP, Buf, GIF_VERSION_POS) != 0) {
+ if (Error != NULL)
+ *Error = D_GIF_ERR_NOT_GIF_FILE;
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ if (DGifGetScreenDesc(GifFile) == GIF_ERROR) {
+ free((char *)Private);
+ free((char *)GifFile);
+ return NULL;
+ }
+
+ GifFile->Error = 0;
+
+ /* What version of GIF? */
+ Private->gif89 = (Buf[GIF_VERSION_POS] == '9');
+
+ return GifFile;
+}
+
+/******************************************************************************
+ This routine should be called before any other DGif calls. Note that
+ this routine is called automatically from DGif file open routines.
+******************************************************************************/
+int
+DGifGetScreenDesc(GifFileType *GifFile)
+{
+ int BitsPerPixel;
+ bool SortFlag;
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ /* Put the screen descriptor into the file: */
+ if (DGifGetWord(GifFile, &GifFile->SWidth) == GIF_ERROR ||
+ DGifGetWord(GifFile, &GifFile->SHeight) == GIF_ERROR)
+ return GIF_ERROR;
+
+ if (READ(GifFile, Buf, 3) != 3) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ GifFreeMapObject(GifFile->SColorMap);
+ GifFile->SColorMap = NULL;
+ return GIF_ERROR;
+ }
+ GifFile->SColorResolution = (((Buf[0] & 0x70) + 1) >> 4) + 1;
+ SortFlag = (Buf[0] & 0x08) != 0;
+ BitsPerPixel = (Buf[0] & 0x07) + 1;
+ GifFile->SBackGroundColor = Buf[1];
+ GifFile->AspectByte = Buf[2];
+ if (Buf[0] & 0x80) { /* Do we have global color map? */
+ int i;
+
+ GifFile->SColorMap = GifMakeMapObject(1 << BitsPerPixel, NULL);
+ if (GifFile->SColorMap == NULL) {
+ GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+
+ /* Get the global color map: */
+ GifFile->SColorMap->SortFlag = SortFlag;
+ for (i = 0; i < GifFile->SColorMap->ColorCount; i++) {
+ if (READ(GifFile, Buf, 3) != 3) {
+ GifFreeMapObject(GifFile->SColorMap);
+ GifFile->SColorMap = NULL;
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ GifFile->SColorMap->Colors[i].Red = Buf[0];
+ GifFile->SColorMap->Colors[i].Green = Buf[1];
+ GifFile->SColorMap->Colors[i].Blue = Buf[2];
+ }
+ } else {
+ GifFile->SColorMap = NULL;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine should be called before any attempt to read an image.
+******************************************************************************/
+int
+DGifGetRecordType(GifFileType *GifFile, GifRecordType* Type)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (READ(GifFile, &Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+
+ switch (Buf) {
+ case DESCRIPTOR_INTRODUCER:
+ *Type = IMAGE_DESC_RECORD_TYPE;
+ break;
+ case EXTENSION_INTRODUCER:
+ *Type = EXTENSION_RECORD_TYPE;
+ break;
+ case TERMINATOR_INTRODUCER:
+ *Type = TERMINATE_RECORD_TYPE;
+ break;
+ default:
+ *Type = UNDEFINED_RECORD_TYPE;
+ GifFile->Error = D_GIF_ERR_WRONG_RECORD;
+ return GIF_ERROR;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine should be called before any attempt to read an image.
+ Note it is assumed the Image desc. header has been read.
+******************************************************************************/
+int
+DGifGetImageDesc(GifFileType *GifFile)
+{
+ unsigned int BitsPerPixel;
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+ SavedImage *sp;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (DGifGetWord(GifFile, &GifFile->Image.Left) == GIF_ERROR ||
+ DGifGetWord(GifFile, &GifFile->Image.Top) == GIF_ERROR ||
+ DGifGetWord(GifFile, &GifFile->Image.Width) == GIF_ERROR ||
+ DGifGetWord(GifFile, &GifFile->Image.Height) == GIF_ERROR)
+ return GIF_ERROR;
+ if (READ(GifFile, Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ GifFreeMapObject(GifFile->Image.ColorMap);
+ GifFile->Image.ColorMap = NULL;
+ return GIF_ERROR;
+ }
+ BitsPerPixel = (Buf[0] & 0x07) + 1;
+ GifFile->Image.Interlace = (Buf[0] & 0x40) ? true : false;
+
+ /* Setup the colormap */
+ if (GifFile->Image.ColorMap) {
+ GifFreeMapObject(GifFile->Image.ColorMap);
+ GifFile->Image.ColorMap = NULL;
+ }
+ /* Does this image have local color map? */
+ if (Buf[0] & 0x80) {
+ unsigned int i;
+
+ GifFile->Image.ColorMap = GifMakeMapObject(1 << BitsPerPixel, NULL);
+ if (GifFile->Image.ColorMap == NULL) {
+ GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+
+ /* Get the image local color map: */
+ for (i = 0; i < GifFile->Image.ColorMap->ColorCount; i++) {
+ if (READ(GifFile, Buf, 3) != 3) {
+ GifFreeMapObject(GifFile->Image.ColorMap);
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ GifFile->Image.ColorMap = NULL;
+ return GIF_ERROR;
+ }
+ GifFile->Image.ColorMap->Colors[i].Red = Buf[0];
+ GifFile->Image.ColorMap->Colors[i].Green = Buf[1];
+ GifFile->Image.ColorMap->Colors[i].Blue = Buf[2];
+ }
+ }
+
+ if (GifFile->SavedImages) {
+ if ((GifFile->SavedImages = (SavedImage *)realloc(GifFile->SavedImages,
+ sizeof(SavedImage) *
+ (GifFile->ImageCount + 1))) == NULL) {
+ GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+ } else {
+ if ((GifFile->SavedImages =
+ (SavedImage *) malloc(sizeof(SavedImage))) == NULL) {
+ GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+ }
+
+ sp = &GifFile->SavedImages[GifFile->ImageCount];
+ memcpy(&sp->ImageDesc, &GifFile->Image, sizeof(GifImageDesc));
+ if (GifFile->Image.ColorMap != NULL) {
+ sp->ImageDesc.ColorMap = GifMakeMapObject(
+ GifFile->Image.ColorMap->ColorCount,
+ GifFile->Image.ColorMap->Colors);
+ if (sp->ImageDesc.ColorMap == NULL) {
+ GifFile->Error = D_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+ }
+ sp->RasterBits = (unsigned char *)NULL;
+ sp->ExtensionBlockCount = 0;
+ sp->ExtensionBlocks = (ExtensionBlock *) NULL;
+
+ GifFile->ImageCount++;
+
+ Private->PixelCount = (long)GifFile->Image.Width *
+ (long)GifFile->Image.Height;
+
+ /* Reset decompress algorithm parameters. */
+ (void)DGifSetupDecompress(GifFile);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Get one full scanned line (Line) of length LineLen from GIF file.
+******************************************************************************/
+int
+DGifGetLine(GifFileType *GifFile, GifPixelType *Line, int LineLen)
+{
+ GifByteType *Dummy;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (!LineLen)
+ LineLen = GifFile->Image.Width;
+
+ if ((Private->PixelCount -= LineLen) > 0xffff0000UL) {
+ GifFile->Error = D_GIF_ERR_DATA_TOO_BIG;
+ return GIF_ERROR;
+ }
+
+ if (DGifDecompressLine(GifFile, Line, LineLen) == GIF_OK) {
+ if (Private->PixelCount == 0) {
+ /* We probably won't be called any more, so let's clean up
+ * everything before we return: need to flush out all the
+ * rest of image until an empty block (size 0)
+ * detected. We use GetCodeNext.
+ */
+ do
+ if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
+ return GIF_ERROR;
+ while (Dummy != NULL) ;
+ }
+ return GIF_OK;
+ } else
+ return GIF_ERROR;
+}
+
+/******************************************************************************
+ Put one pixel (Pixel) into GIF file.
+******************************************************************************/
+int
+DGifGetPixel(GifFileType *GifFile, GifPixelType Pixel)
+{
+ GifByteType *Dummy;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+ if (--Private->PixelCount > 0xffff0000UL)
+ {
+ GifFile->Error = D_GIF_ERR_DATA_TOO_BIG;
+ return GIF_ERROR;
+ }
+
+ if (DGifDecompressLine(GifFile, &Pixel, 1) == GIF_OK) {
+ if (Private->PixelCount == 0) {
+ /* We probably won't be called any more, so let's clean up
+ * everything before we return: need to flush out all the
+ * rest of image until an empty block (size 0)
+ * detected. We use GetCodeNext.
+ */
+ do
+ if (DGifGetCodeNext(GifFile, &Dummy) == GIF_ERROR)
+ return GIF_ERROR;
+ while (Dummy != NULL) ;
+ }
+ return GIF_OK;
+ } else
+ return GIF_ERROR;
+}
+
+/******************************************************************************
+ Get an extension block (see GIF manual) from GIF file. This routine only
+ returns the first data block, and DGifGetExtensionNext should be called
+ after this one until NULL extension is returned.
+ The Extension should NOT be freed by the user (not dynamically allocated).
+ Note it is assumed the Extension description header has been read.
+******************************************************************************/
+int
+DGifGetExtension(GifFileType *GifFile, int *ExtCode, GifByteType **Extension)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (READ(GifFile, &Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ *ExtCode = Buf;
+
+ return DGifGetExtensionNext(GifFile, Extension);
+}
+
+/******************************************************************************
+ Get a following extension block (see GIF manual) from GIF file. This
+ routine should be called until NULL Extension is returned.
+ The Extension should NOT be freed by the user (not dynamically allocated).
+******************************************************************************/
+int
+DGifGetExtensionNext(GifFileType *GifFile, GifByteType ** Extension)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (READ(GifFile, &Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ if (Buf > 0) {
+ *Extension = Private->Buf; /* Use private unused buffer. */
+ (*Extension)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
+ /* coverity[tainted_data] */
+ if (READ(GifFile, &((*Extension)[1]), Buf) != Buf) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ } else
+ *Extension = NULL;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Extract a Graphics Control Block from raw extension data
+******************************************************************************/
+
+int DGifExtensionToGCB(const size_t GifExtensionLength,
+ const GifByteType *GifExtension,
+ GraphicsControlBlock *GCB)
+{
+ if (GifExtensionLength != 4) {
+ return GIF_ERROR;
+ }
+
+ GCB->DisposalMode = (GifExtension[0] >> 2) & 0x07;
+ GCB->UserInputFlag = (GifExtension[0] & 0x02) != 0;
+ GCB->DelayTime = UNSIGNED_LITTLE_ENDIAN(GifExtension[1], GifExtension[2]);
+ if (GifExtension[0] & 0x01)
+ GCB->TransparentColor = (int)GifExtension[3];
+ else
+ GCB->TransparentColor = NO_TRANSPARENT_COLOR;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Extract the Graphics Control Block for a saved image, if it exists.
+******************************************************************************/
+
+int DGifSavedExtensionToGCB(GifFileType *GifFile,
+ int ImageIndex, GraphicsControlBlock *GCB)
+{
+ int i;
+
+ if (ImageIndex < 0 || ImageIndex > GifFile->ImageCount - 1)
+ return GIF_ERROR;
+
+ GCB->DisposalMode = DISPOSAL_UNSPECIFIED;
+ GCB->UserInputFlag = false;
+ GCB->DelayTime = 0;
+ GCB->TransparentColor = NO_TRANSPARENT_COLOR;
+
+ for (i = 0; i < GifFile->SavedImages[ImageIndex].ExtensionBlockCount; i++) {
+ ExtensionBlock *ep = &GifFile->SavedImages[ImageIndex].ExtensionBlocks[i];
+ if (ep->Function == GRAPHICS_EXT_FUNC_CODE)
+ return DGifExtensionToGCB(ep->ByteCount, ep->Bytes, GCB);
+ }
+
+ return GIF_ERROR;
+}
+
+/******************************************************************************
+ This routine should be called last, to close the GIF file.
+******************************************************************************/
+int
+DGifCloseFile(GifFileType *GifFile)
+{
+ GifFilePrivateType *Private;
+
+ if (GifFile == NULL || GifFile->Private == NULL)
+ return GIF_ERROR;
+
+ if (GifFile->Image.ColorMap) {
+ GifFreeMapObject(GifFile->Image.ColorMap);
+ GifFile->Image.ColorMap = NULL;
+ }
+
+ if (GifFile->SColorMap) {
+ GifFreeMapObject(GifFile->SColorMap);
+ GifFile->SColorMap = NULL;
+ }
+
+ if (GifFile->SavedImages) {
+ GifFreeSavedImages(GifFile);
+ GifFile->SavedImages = NULL;
+ }
+
+ GifFreeExtensions(&GifFile->ExtensionBlockCount, &GifFile->ExtensionBlocks);
+
+ Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (Private->File && (fclose(Private->File) != 0)) {
+ GifFile->Error = D_GIF_ERR_CLOSE_FAILED;
+ return GIF_ERROR;
+ }
+
+ free((char *)GifFile->Private);
+
+ /*
+ * Without the #ifndef, we get spurious warnings because Coverity mistakenly
+ * thinks the GIF structure is freed on an error return.
+ */
+#ifndef __COVERITY__
+ free(GifFile);
+#endif /* __COVERITY__ */
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Get 2 bytes (word) from the given file:
+******************************************************************************/
+static int
+DGifGetWord(GifFileType *GifFile, GifWord *Word)
+{
+ unsigned char c[2];
+
+ if (READ(GifFile, c, 2) != 2) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+
+ *Word = (GifWord)UNSIGNED_LITTLE_ENDIAN(c[0], c[1]);
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Get the image code in compressed form. This routine can be called if the
+ information needed to be piped out as is. Obviously this is much faster
+ than decoding and encoding again. This routine should be followed by calls
+ to DGifGetCodeNext, until NULL block is returned.
+ The block should NOT be freed by the user (not dynamically allocated).
+******************************************************************************/
+int
+DGifGetCode(GifFileType *GifFile, int *CodeSize, GifByteType **CodeBlock)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ *CodeSize = Private->BitsPerPixel;
+
+ return DGifGetCodeNext(GifFile, CodeBlock);
+}
+
+/******************************************************************************
+ Continue to get the image code in compressed form. This routine should be
+ called until NULL block is returned.
+ The block should NOT be freed by the user (not dynamically allocated).
+******************************************************************************/
+int
+DGifGetCodeNext(GifFileType *GifFile, GifByteType **CodeBlock)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ /* coverity[tainted_data_argument] */
+ if (READ(GifFile, &Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+
+ /* coverity[lower_bounds] */
+ if (Buf > 0) {
+ *CodeBlock = Private->Buf; /* Use private unused buffer. */
+ (*CodeBlock)[0] = Buf; /* Pascal strings notation (pos. 0 is len.). */
+ /* coverity[tainted_data] */
+ if (READ(GifFile, &((*CodeBlock)[1]), Buf) != Buf) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ } else {
+ *CodeBlock = NULL;
+ Private->Buf[0] = 0; /* Make sure the buffer is empty! */
+ Private->PixelCount = 0; /* And local info. indicate image read. */
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Setup the LZ decompression for this image:
+******************************************************************************/
+static int
+DGifSetupDecompress(GifFileType *GifFile)
+{
+ int i, BitsPerPixel;
+ GifByteType CodeSize;
+ GifPrefixType *Prefix;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ READ(GifFile, &CodeSize, 1); /* Read Code size from file. */
+ BitsPerPixel = CodeSize;
+
+ Private->Buf[0] = 0; /* Input Buffer empty. */
+ Private->BitsPerPixel = BitsPerPixel;
+ Private->ClearCode = (1 << BitsPerPixel);
+ Private->EOFCode = Private->ClearCode + 1;
+ Private->RunningCode = Private->EOFCode + 1;
+ Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */
+ Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */
+ Private->StackPtr = 0; /* No pixels on the pixel stack. */
+ Private->LastCode = NO_SUCH_CODE;
+ Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */
+ Private->CrntShiftDWord = 0;
+
+ Prefix = Private->Prefix;
+ for (i = 0; i <= LZ_MAX_CODE; i++)
+ Prefix[i] = NO_SUCH_CODE;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ The LZ decompression routine:
+ This version decompress the given GIF file into Line of length LineLen.
+ This routine can be called few times (one per scan line, for example), in
+ order the complete the whole image.
+******************************************************************************/
+static int
+DGifDecompressLine(GifFileType *GifFile, GifPixelType *Line, int LineLen)
+{
+ int i = 0;
+ int j, CrntCode, EOFCode, ClearCode, CrntPrefix, LastCode, StackPtr;
+ GifByteType *Stack, *Suffix;
+ GifPrefixType *Prefix;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ StackPtr = Private->StackPtr;
+ Prefix = Private->Prefix;
+ Suffix = Private->Suffix;
+ Stack = Private->Stack;
+ EOFCode = Private->EOFCode;
+ ClearCode = Private->ClearCode;
+ LastCode = Private->LastCode;
+
+ if (StackPtr > LZ_MAX_CODE) {
+ return GIF_ERROR;
+ }
+
+ if (StackPtr != 0) {
+ /* Let pop the stack off before continueing to read the GIF file: */
+ while (StackPtr != 0 && i < LineLen)
+ Line[i++] = Stack[--StackPtr];
+ }
+
+ while (i < LineLen) { /* Decode LineLen items. */
+ if (DGifDecompressInput(GifFile, &CrntCode) == GIF_ERROR)
+ return GIF_ERROR;
+
+ if (CrntCode == EOFCode) {
+ /* Note however that usually we will not be here as we will stop
+ * decoding as soon as we got all the pixel, or EOF code will
+ * not be read at all, and DGifGetLine/Pixel clean everything. */
+ GifFile->Error = D_GIF_ERR_EOF_TOO_SOON;
+ return GIF_ERROR;
+ } else if (CrntCode == ClearCode) {
+ /* We need to start over again: */
+ for (j = 0; j <= LZ_MAX_CODE; j++)
+ Prefix[j] = NO_SUCH_CODE;
+ Private->RunningCode = Private->EOFCode + 1;
+ Private->RunningBits = Private->BitsPerPixel + 1;
+ Private->MaxCode1 = 1 << Private->RunningBits;
+ LastCode = Private->LastCode = NO_SUCH_CODE;
+ } else {
+ /* Its regular code - if in pixel range simply add it to output
+ * stream, otherwise trace to codes linked list until the prefix
+ * is in pixel range: */
+ if (CrntCode < ClearCode) {
+ /* This is simple - its pixel scalar, so add it to output: */
+ Line[i++] = CrntCode;
+ } else {
+ /* Its a code to needed to be traced: trace the linked list
+ * until the prefix is a pixel, while pushing the suffix
+ * pixels on our stack. If we done, pop the stack in reverse
+ * (thats what stack is good for!) order to output. */
+ if (Prefix[CrntCode] == NO_SUCH_CODE) {
+ /* Only allowed if CrntCode is exactly the running code:
+ * In that case CrntCode = XXXCode, CrntCode or the
+ * prefix code is last code and the suffix char is
+ * exactly the prefix of last code! */
+ if (CrntCode == Private->RunningCode - 2) {
+ CrntPrefix = LastCode;
+ Suffix[Private->RunningCode - 2] =
+ Stack[StackPtr++] = DGifGetPrefixChar(Prefix,
+ LastCode,
+ ClearCode);
+ } else {
+ GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
+ return GIF_ERROR;
+ }
+ } else
+ CrntPrefix = CrntCode;
+
+ /* Now (if image is O.K.) we should not get a NO_SUCH_CODE
+ * during the trace. As we might loop forever, in case of
+ * defective image, we use StackPtr as loop counter and stop
+ * before overflowing Stack[]. */
+ while (StackPtr < LZ_MAX_CODE &&
+ CrntPrefix > ClearCode && CrntPrefix <= LZ_MAX_CODE) {
+ Stack[StackPtr++] = Suffix[CrntPrefix];
+ CrntPrefix = Prefix[CrntPrefix];
+ }
+ if (StackPtr >= LZ_MAX_CODE || CrntPrefix > LZ_MAX_CODE) {
+ GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
+ return GIF_ERROR;
+ }
+ /* Push the last character on stack: */
+ Stack[StackPtr++] = CrntPrefix;
+
+ /* Now lets pop all the stack into output: */
+ while (StackPtr != 0 && i < LineLen)
+ Line[i++] = Stack[--StackPtr];
+ }
+ if (LastCode != NO_SUCH_CODE && Prefix[Private->RunningCode - 2] == NO_SUCH_CODE) {
+ Prefix[Private->RunningCode - 2] = LastCode;
+
+ if (CrntCode == Private->RunningCode - 2) {
+ /* Only allowed if CrntCode is exactly the running code:
+ * In that case CrntCode = XXXCode, CrntCode or the
+ * prefix code is last code and the suffix char is
+ * exactly the prefix of last code! */
+ Suffix[Private->RunningCode - 2] =
+ DGifGetPrefixChar(Prefix, LastCode, ClearCode);
+ } else {
+ Suffix[Private->RunningCode - 2] =
+ DGifGetPrefixChar(Prefix, CrntCode, ClearCode);
+ }
+ }
+ LastCode = CrntCode;
+ }
+ }
+
+ Private->LastCode = LastCode;
+ Private->StackPtr = StackPtr;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Routine to trace the Prefixes linked list until we get a prefix which is
+ not code, but a pixel value (less than ClearCode). Returns that pixel value.
+ If image is defective, we might loop here forever, so we limit the loops to
+ the maximum possible if image O.k. - LZ_MAX_CODE times.
+******************************************************************************/
+static int
+DGifGetPrefixChar(GifPrefixType *Prefix, int Code, int ClearCode)
+{
+ int i = 0;
+
+ while (Code > ClearCode && i++ <= LZ_MAX_CODE) {
+ if (Code > LZ_MAX_CODE) {
+ return NO_SUCH_CODE;
+ }
+ Code = Prefix[Code];
+ }
+ return Code;
+}
+
+/******************************************************************************
+ Interface for accessing the LZ codes directly. Set Code to the real code
+ (12bits), or to -1 if EOF code is returned.
+******************************************************************************/
+int
+DGifGetLZCodes(GifFileType *GifFile, int *Code)
+{
+ GifByteType *CodeBlock;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_READABLE(Private)) {
+ /* This file was NOT open for reading: */
+ GifFile->Error = D_GIF_ERR_NOT_READABLE;
+ return GIF_ERROR;
+ }
+
+ if (DGifDecompressInput(GifFile, Code) == GIF_ERROR)
+ return GIF_ERROR;
+
+ if (*Code == Private->EOFCode) {
+ /* Skip rest of codes (hopefully only NULL terminating block): */
+ do {
+ if (DGifGetCodeNext(GifFile, &CodeBlock) == GIF_ERROR)
+ return GIF_ERROR;
+ } while (CodeBlock != NULL) ;
+
+ *Code = -1;
+ } else if (*Code == Private->ClearCode) {
+ /* We need to start over again: */
+ Private->RunningCode = Private->EOFCode + 1;
+ Private->RunningBits = Private->BitsPerPixel + 1;
+ Private->MaxCode1 = 1 << Private->RunningBits;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ The LZ decompression input routine:
+ This routine is responsable for the decompression of the bit stream from
+ 8 bits (bytes) packets, into the real codes.
+ Returns GIF_OK if read successfully.
+******************************************************************************/
+static int
+DGifDecompressInput(GifFileType *GifFile, int *Code)
+{
+ static const unsigned short CodeMasks[] = {
+ 0x0000, 0x0001, 0x0003, 0x0007,
+ 0x000f, 0x001f, 0x003f, 0x007f,
+ 0x00ff, 0x01ff, 0x03ff, 0x07ff,
+ 0x0fff
+ };
+
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ GifByteType NextByte;
+
+ /* The image can't contain more than LZ_BITS per code. */
+ if (Private->RunningBits > LZ_BITS) {
+ GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
+ return GIF_ERROR;
+ }
+
+ while (Private->CrntShiftState < Private->RunningBits) {
+ /* Needs to get more bytes from input stream for next code: */
+ if (DGifBufferedInput(GifFile, Private->Buf, &NextByte) == GIF_ERROR) {
+ return GIF_ERROR;
+ }
+ Private->CrntShiftDWord |=
+ ((unsigned long)NextByte) << Private->CrntShiftState;
+ Private->CrntShiftState += 8;
+ }
+ *Code = Private->CrntShiftDWord & CodeMasks[Private->RunningBits];
+
+ Private->CrntShiftDWord >>= Private->RunningBits;
+ Private->CrntShiftState -= Private->RunningBits;
+
+ /* If code cannot fit into RunningBits bits, must raise its size. Note
+ * however that codes above 4095 are used for special signaling.
+ * If we're using LZ_BITS bits already and we're at the max code, just
+ * keep using the table as it is, don't increment Private->RunningCode.
+ */
+ if (Private->RunningCode < LZ_MAX_CODE + 2 &&
+ ++Private->RunningCode > Private->MaxCode1 &&
+ Private->RunningBits < LZ_BITS) {
+ Private->MaxCode1 <<= 1;
+ Private->RunningBits++;
+ }
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routines read one GIF data block at a time and buffers it internally
+ so that the decompression routine could access it.
+ The routine returns the next byte from its internal buffer (or read next
+ block in if buffer empty) and returns GIF_OK if succesful.
+******************************************************************************/
+static int
+DGifBufferedInput(GifFileType *GifFile, GifByteType *Buf, GifByteType *NextByte)
+{
+ if (Buf[0] == 0) {
+ /* Needs to read the next buffer - this one is empty: */
+ if (READ(GifFile, Buf, 1) != 1) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ /* There shouldn't be any empty data blocks here as the LZW spec
+ * says the LZW termination code should come first. Therefore we
+ * shouldn't be inside this routine at that point.
+ */
+ if (Buf[0] == 0) {
+ GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
+ return GIF_ERROR;
+ }
+ /* There shouldn't be any empty data blocks here as the LZW spec
+ * says the LZW termination code should come first. Therefore we
+ * shouldn't be inside this routine at that point.
+ */
+ if (Buf[0] == 0) {
+ GifFile->Error = D_GIF_ERR_IMAGE_DEFECT;
+ return GIF_ERROR;
+ }
+ if (READ(GifFile, &Buf[1], Buf[0]) != Buf[0]) {
+ GifFile->Error = D_GIF_ERR_READ_FAILED;
+ return GIF_ERROR;
+ }
+ *NextByte = Buf[1];
+ Buf[1] = 2; /* We use now the second place as last char read! */
+ Buf[0]--;
+ } else {
+ *NextByte = Buf[Buf[1]++];
+ Buf[0]--;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine reads an entire GIF into core, hanging all its state info off
+ the GifFileType pointer. Call DGifOpenFileName() or DGifOpenFileHandle()
+ first to initialize I/O. Its inverse is EGifSpew().
+*******************************************************************************/
+int
+DGifSlurp(GifFileType *GifFile)
+{
+ size_t ImageSize;
+ GifRecordType RecordType;
+ SavedImage *sp;
+ GifByteType *ExtData;
+ int ExtFunction;
+
+ GifFile->ExtensionBlocks = NULL;
+ GifFile->ExtensionBlockCount = 0;
+
+ do {
+ if (DGifGetRecordType(GifFile, &RecordType) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ switch (RecordType) {
+ case IMAGE_DESC_RECORD_TYPE:
+ if (DGifGetImageDesc(GifFile) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ sp = &GifFile->SavedImages[GifFile->ImageCount - 1];
+ /* Allocate memory for the image */
+ if (sp->ImageDesc.Width < 0 && sp->ImageDesc.Height < 0 &&
+ sp->ImageDesc.Width > (INT_MAX / sp->ImageDesc.Height)) {
+ return GIF_ERROR;
+ }
+ ImageSize = sp->ImageDesc.Width * sp->ImageDesc.Height;
+
+ if (ImageSize > (SIZE_MAX / sizeof(GifPixelType))) {
+ return GIF_ERROR;
+ }
+ sp->RasterBits = (unsigned char *)malloc(ImageSize *
+ sizeof(GifPixelType));
+
+ if (sp->RasterBits == NULL) {
+ return GIF_ERROR;
+ }
+
+ if (sp->ImageDesc.Interlace) {
+ int i, j;
+ /*
+ * The way an interlaced image should be read -
+ * offsets and jumps...
+ */
+ int InterlacedOffset[] = { 0, 4, 2, 1 };
+ int InterlacedJumps[] = { 8, 8, 4, 2 };
+ /* Need to perform 4 passes on the image */
+ for (i = 0; i < 4; i++)
+ for (j = InterlacedOffset[i];
+ j < sp->ImageDesc.Height;
+ j += InterlacedJumps[i]) {
+ if (DGifGetLine(GifFile,
+ sp->RasterBits+j*sp->ImageDesc.Width,
+ sp->ImageDesc.Width) == GIF_ERROR)
+ return GIF_ERROR;
+ }
+ }
+ else {
+ if (DGifGetLine(GifFile,sp->RasterBits,ImageSize)==GIF_ERROR)
+ return (GIF_ERROR);
+ }
+
+ if (GifFile->ExtensionBlocks) {
+ sp->ExtensionBlocks = GifFile->ExtensionBlocks;
+ sp->ExtensionBlockCount = GifFile->ExtensionBlockCount;
+
+ GifFile->ExtensionBlocks = NULL;
+ GifFile->ExtensionBlockCount = 0;
+ }
+ break;
+
+ case EXTENSION_RECORD_TYPE:
+ if (DGifGetExtension(GifFile,&ExtFunction,&ExtData) == GIF_ERROR)
+ return (GIF_ERROR);
+ /* Create an extension block with our data */
+ if (ExtData != NULL) {
+ if (GifAddExtensionBlock(&GifFile->ExtensionBlockCount,
+ &GifFile->ExtensionBlocks,
+ ExtFunction, ExtData[0], &ExtData[1])
+ == GIF_ERROR)
+ return (GIF_ERROR);
+ }
+ while (ExtData != NULL) {
+ if (DGifGetExtensionNext(GifFile, &ExtData) == GIF_ERROR)
+ return (GIF_ERROR);
+ /* Continue the extension block */
+ if (ExtData != NULL)
+ if (GifAddExtensionBlock(&GifFile->ExtensionBlockCount,
+ &GifFile->ExtensionBlocks,
+ CONTINUE_EXT_FUNC_CODE,
+ ExtData[0], &ExtData[1]) == GIF_ERROR)
+ return (GIF_ERROR);
+ }
+ break;
+
+ case TERMINATE_RECORD_TYPE:
+ break;
+
+ default: /* Should be trapped by DGifGetRecordType */
+ break;
+ }
+ } while (RecordType != TERMINATE_RECORD_TYPE);
+
+ return (GIF_OK);
+}
+
+/* end */
diff --git a/giflib/egif_lib.c b/giflib/egif_lib.c
new file mode 100644
index 0000000..4e353ba
--- /dev/null
+++ b/giflib/egif_lib.c
@@ -0,0 +1,1149 @@
+/******************************************************************************
+
+egif_lib.c - GIF encoding
+
+The functions here and in dgif_lib.c are partitioned carefully so that
+if you only require one of read and write capability, only one of these
+two modules will be linked. Preserve this property!
+
+*****************************************************************************/
+
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+
+#ifdef _WIN32
+#include <io.h>
+#else
+#include <sys/types.h>
+#endif /* _WIN32 */
+#include <sys/stat.h>
+
+#include "gif_lib.h"
+#include "gif_lib_private.h"
+
+/* Masks given codes to BitsPerPixel, to make sure all codes are in range: */
+/*@+charint@*/
+static const GifPixelType CodeMask[] = {
+ 0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff
+};
+/*@-charint@*/
+
+static int EGifPutWord(int Word, GifFileType * GifFile);
+static int EGifSetupCompress(GifFileType * GifFile);
+static int EGifCompressLine(GifFileType * GifFile, GifPixelType * Line,
+ int LineLen);
+static int EGifCompressOutput(GifFileType * GifFile, int Code);
+static int EGifBufferedOutput(GifFileType * GifFile, GifByteType * Buf,
+ int c);
+
+/* extract bytes from an unsigned word */
+#define LOBYTE(x) ((x) & 0xff)
+#define HIBYTE(x) (((x) >> 8) & 0xff)
+
+/******************************************************************************
+ Open a new GIF file for write, specified by name. If TestExistance then
+ if the file exists this routines fails (returns NULL).
+ Returns a dynamically allocated GifFileType pointer which serves as the GIF
+ info record. The Error member is cleared if successful.
+******************************************************************************/
+GifFileType *
+EGifOpenFileName(const char *FileName, const bool TestExistence, int *Error)
+{
+
+ int FileHandle;
+ GifFileType *GifFile;
+
+ if (TestExistence)
+ /* android-changed: changed "S_IREAD | S_IWRITE" to "S_IRUSR | S_IWUSR" */
+ FileHandle = open(FileName, O_WRONLY | O_CREAT | O_EXCL,
+ S_IRUSR | S_IWUSR);
+ else
+ /* android-changed: changed "S_IREAD | S_IWRITE" to "S_IRUSR | S_IWUSR" */
+ FileHandle = open(FileName, O_WRONLY | O_CREAT | O_TRUNC,
+ S_IRUSR | S_IWUSR);
+
+ if (FileHandle == -1) {
+ if (Error != NULL)
+ *Error = E_GIF_ERR_OPEN_FAILED;
+ return NULL;
+ }
+ GifFile = EGifOpenFileHandle(FileHandle, Error);
+ if (GifFile == (GifFileType *) NULL)
+ (void)close(FileHandle);
+ return GifFile;
+}
+
+/******************************************************************************
+ Update a new GIF file, given its file handle, which must be opened for
+ write in binary mode.
+ Returns dynamically allocated a GifFileType pointer which serves as the GIF
+ info record.
+ Only fails on a memory allocation error.
+******************************************************************************/
+GifFileType *
+EGifOpenFileHandle(const int FileHandle, int *Error)
+{
+ GifFileType *GifFile;
+ GifFilePrivateType *Private;
+ FILE *f;
+
+ GifFile = (GifFileType *) malloc(sizeof(GifFileType));
+ if (GifFile == NULL) {
+ return NULL;
+ }
+
+ memset(GifFile, '\0', sizeof(GifFileType));
+
+ Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
+ if (Private == NULL) {
+ free(GifFile);
+ if (Error != NULL)
+ *Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+ if ((Private->HashTable = _InitHashTable()) == NULL) {
+ free(GifFile);
+ free(Private);
+ if (Error != NULL)
+ *Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+#ifdef _WIN32
+ _setmode(FileHandle, O_BINARY); /* Make sure it is in binary mode. */
+#endif /* _WIN32 */
+
+ f = fdopen(FileHandle, "wb"); /* Make it into a stream: */
+
+ GifFile->Private = (void *)Private;
+ Private->FileHandle = FileHandle;
+ Private->File = f;
+ Private->FileState = FILE_STATE_WRITE;
+
+ Private->Write = (OutputFunc) 0; /* No user write routine (MRB) */
+ GifFile->UserData = (void *)NULL; /* No user write handle (MRB) */
+
+ GifFile->Error = 0;
+
+ return GifFile;
+}
+
+/******************************************************************************
+ Output constructor that takes user supplied output function.
+ Basically just a copy of EGifOpenFileHandle. (MRB)
+******************************************************************************/
+GifFileType *
+EGifOpen(void *userData, OutputFunc writeFunc, int *Error)
+{
+ GifFileType *GifFile;
+ GifFilePrivateType *Private;
+
+ GifFile = (GifFileType *)malloc(sizeof(GifFileType));
+ if (GifFile == NULL) {
+ if (Error != NULL)
+ *Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+ memset(GifFile, '\0', sizeof(GifFileType));
+
+ Private = (GifFilePrivateType *)malloc(sizeof(GifFilePrivateType));
+ if (Private == NULL) {
+ free(GifFile);
+ if (Error != NULL)
+ *Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+ Private->HashTable = _InitHashTable();
+ if (Private->HashTable == NULL) {
+ free (GifFile);
+ free (Private);
+ if (Error != NULL)
+ *Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return NULL;
+ }
+
+ GifFile->Private = (void *)Private;
+ Private->FileHandle = 0;
+ Private->File = (FILE *) 0;
+ Private->FileState = FILE_STATE_WRITE;
+
+ Private->Write = writeFunc; /* User write routine (MRB) */
+ GifFile->UserData = userData; /* User write handle (MRB) */
+
+ Private->gif89 = false; /* initially, write GIF87 */
+
+ GifFile->Error = 0;
+
+ return GifFile;
+}
+
+/******************************************************************************
+ Routine to compute the GIF version that will be written on output.
+******************************************************************************/
+char *
+EGifGetGifVersion(GifFileType *GifFile)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+ int i, j;
+
+ /*
+ * Bulletproofing - always write GIF89 if we need to.
+ * Note, we don't clear the gif89 flag here because
+ * users of the sequential API might have called EGifSetGifVersion()
+ * in order to set that flag.
+ */
+ for (i = 0; i < GifFile->ImageCount; i++) {
+ for (j = 0; j < GifFile->SavedImages[i].ExtensionBlockCount; j++) {
+ int function =
+ GifFile->SavedImages[i].ExtensionBlocks[j].Function;
+
+ if (function == COMMENT_EXT_FUNC_CODE
+ || function == GRAPHICS_EXT_FUNC_CODE
+ || function == PLAINTEXT_EXT_FUNC_CODE
+ || function == APPLICATION_EXT_FUNC_CODE)
+ Private->gif89 = true;
+ }
+ }
+ for (i = 0; i < GifFile->ExtensionBlockCount; i++) {
+ int function = GifFile->ExtensionBlocks[i].Function;
+
+ if (function == COMMENT_EXT_FUNC_CODE
+ || function == GRAPHICS_EXT_FUNC_CODE
+ || function == PLAINTEXT_EXT_FUNC_CODE
+ || function == APPLICATION_EXT_FUNC_CODE)
+ Private->gif89 = true;
+ }
+
+ if (Private->gif89)
+ return GIF89_STAMP;
+ else
+ return GIF87_STAMP;
+}
+
+/******************************************************************************
+ Set the GIF version. In the extremely unlikely event that there is ever
+ another version, replace the bool argument with an enum in which the
+ GIF87 value is 0 (numerically the same as bool false) and the GIF89 value
+ is 1 (numerically the same as bool true). That way we'll even preserve
+ object-file compatibility!
+******************************************************************************/
+void EGifSetGifVersion(GifFileType *GifFile, const bool gif89)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ Private->gif89 = gif89;
+}
+
+/******************************************************************************
+ All writes to the GIF should go through this.
+******************************************************************************/
+static int InternalWrite(GifFileType *GifFileOut,
+ const unsigned char *buf, size_t len)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType*)GifFileOut->Private;
+ if (Private->Write)
+ return Private->Write(GifFileOut,buf,len);
+ else
+ return fwrite(buf, 1, len, Private->File);
+}
+
+/******************************************************************************
+ This routine should be called before any other EGif calls, immediately
+ following the GIF file opening.
+******************************************************************************/
+int
+EGifPutScreenDesc(GifFileType *GifFile,
+ const int Width,
+ const int Height,
+ const int ColorRes,
+ const int BackGround,
+ const ColorMapObject *ColorMap)
+{
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+ char *write_version;
+
+ if (Private->FileState & FILE_STATE_SCREEN) {
+ /* If already has screen descriptor - something is wrong! */
+ GifFile->Error = E_GIF_ERR_HAS_SCRN_DSCR;
+ return GIF_ERROR;
+ }
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ write_version = EGifGetGifVersion(GifFile);
+
+ /* First write the version prefix into the file. */
+ if (InternalWrite(GifFile, (unsigned char *)write_version,
+ strlen(write_version)) != strlen(write_version)) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+
+ GifFile->SWidth = Width;
+ GifFile->SHeight = Height;
+ GifFile->SColorResolution = ColorRes;
+ GifFile->SBackGroundColor = BackGround;
+ if (ColorMap) {
+ GifFile->SColorMap = GifMakeMapObject(ColorMap->ColorCount,
+ ColorMap->Colors);
+ if (GifFile->SColorMap == NULL) {
+ GifFile->Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+ } else
+ GifFile->SColorMap = NULL;
+
+ /*
+ * Put the logical screen descriptor into the file:
+ */
+ /* Logical Screen Descriptor: Dimensions */
+ (void)EGifPutWord(Width, GifFile);
+ (void)EGifPutWord(Height, GifFile);
+
+ /* Logical Screen Descriptor: Packed Fields */
+ /* Note: We have actual size of the color table default to the largest
+ * possible size (7+1 == 8 bits) because the decoder can use it to decide
+ * how to display the files.
+ */
+ Buf[0] = (ColorMap ? 0x80 : 0x00) | /* Yes/no global colormap */
+ ((ColorRes - 1) << 4) | /* Bits allocated to each primary color */
+ (ColorMap ? ColorMap->BitsPerPixel - 1 : 0x07 ); /* Actual size of the
+ color table. */
+ if (ColorMap != NULL && ColorMap->SortFlag)
+ Buf[0] |= 0x08;
+ Buf[1] = BackGround; /* Index into the ColorTable for background color */
+ Buf[2] = GifFile->AspectByte; /* Pixel Aspect Ratio */
+ InternalWrite(GifFile, Buf, 3);
+
+ /* If we have Global color map - dump it also: */
+ if (ColorMap != NULL) {
+ int i;
+ for (i = 0; i < ColorMap->ColorCount; i++) {
+ /* Put the ColorMap out also: */
+ Buf[0] = ColorMap->Colors[i].Red;
+ Buf[1] = ColorMap->Colors[i].Green;
+ Buf[2] = ColorMap->Colors[i].Blue;
+ if (InternalWrite(GifFile, Buf, 3) != 3) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ }
+ }
+
+ /* Mark this file as has screen descriptor, and no pixel written yet: */
+ Private->FileState |= FILE_STATE_SCREEN;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine should be called before any attempt to dump an image - any
+ call to any of the pixel dump routines.
+******************************************************************************/
+int
+EGifPutImageDesc(GifFileType *GifFile,
+ const int Left,
+ const int Top,
+ const int Width,
+ const int Height,
+ const bool Interlace,
+ const ColorMapObject *ColorMap)
+{
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (Private->FileState & FILE_STATE_IMAGE &&
+ Private->PixelCount > 0xffff0000UL) {
+ /* If already has active image descriptor - something is wrong! */
+ GifFile->Error = E_GIF_ERR_HAS_IMAG_DSCR;
+ return GIF_ERROR;
+ }
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+ GifFile->Image.Left = Left;
+ GifFile->Image.Top = Top;
+ GifFile->Image.Width = Width;
+ GifFile->Image.Height = Height;
+ GifFile->Image.Interlace = Interlace;
+ if (ColorMap) {
+ GifFile->Image.ColorMap = GifMakeMapObject(ColorMap->ColorCount,
+ ColorMap->Colors);
+ if (GifFile->Image.ColorMap == NULL) {
+ GifFile->Error = E_GIF_ERR_NOT_ENOUGH_MEM;
+ return GIF_ERROR;
+ }
+ } else {
+ GifFile->Image.ColorMap = NULL;
+ }
+
+ /* Put the image descriptor into the file: */
+ Buf[0] = DESCRIPTOR_INTRODUCER; /* Image separator character. */
+ InternalWrite(GifFile, Buf, 1);
+ (void)EGifPutWord(Left, GifFile);
+ (void)EGifPutWord(Top, GifFile);
+ (void)EGifPutWord(Width, GifFile);
+ (void)EGifPutWord(Height, GifFile);
+ Buf[0] = (ColorMap ? 0x80 : 0x00) |
+ (Interlace ? 0x40 : 0x00) |
+ (ColorMap ? ColorMap->BitsPerPixel - 1 : 0);
+ InternalWrite(GifFile, Buf, 1);
+
+ /* If we have Global color map - dump it also: */
+ if (ColorMap != NULL) {
+ int i;
+ for (i = 0; i < ColorMap->ColorCount; i++) {
+ /* Put the ColorMap out also: */
+ Buf[0] = ColorMap->Colors[i].Red;
+ Buf[1] = ColorMap->Colors[i].Green;
+ Buf[2] = ColorMap->Colors[i].Blue;
+ if (InternalWrite(GifFile, Buf, 3) != 3) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ }
+ }
+ if (GifFile->SColorMap == NULL && GifFile->Image.ColorMap == NULL) {
+ GifFile->Error = E_GIF_ERR_NO_COLOR_MAP;
+ return GIF_ERROR;
+ }
+
+ /* Mark this file as has screen descriptor: */
+ Private->FileState |= FILE_STATE_IMAGE;
+ Private->PixelCount = (long)Width *(long)Height;
+
+ /* Reset compress algorithm parameters. */
+ (void)EGifSetupCompress(GifFile);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Put one full scanned line (Line) of length LineLen into GIF file.
+******************************************************************************/
+int
+EGifPutLine(GifFileType * GifFile, GifPixelType *Line, int LineLen)
+{
+ int i;
+ GifPixelType Mask;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ if (!LineLen)
+ LineLen = GifFile->Image.Width;
+ if (Private->PixelCount < (unsigned)LineLen) {
+ GifFile->Error = E_GIF_ERR_DATA_TOO_BIG;
+ return GIF_ERROR;
+ }
+ Private->PixelCount -= LineLen;
+
+ /* Make sure the codes are not out of bit range, as we might generate
+ * wrong code (because of overflow when we combine them) in this case: */
+ Mask = CodeMask[Private->BitsPerPixel];
+ for (i = 0; i < LineLen; i++)
+ Line[i] &= Mask;
+
+ return EGifCompressLine(GifFile, Line, LineLen);
+}
+
+/******************************************************************************
+ Put one pixel (Pixel) into GIF file.
+******************************************************************************/
+int
+EGifPutPixel(GifFileType *GifFile, GifPixelType Pixel)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ if (Private->PixelCount == 0) {
+ GifFile->Error = E_GIF_ERR_DATA_TOO_BIG;
+ return GIF_ERROR;
+ }
+ --Private->PixelCount;
+
+ /* Make sure the code is not out of bit range, as we might generate
+ * wrong code (because of overflow when we combine them) in this case: */
+ Pixel &= CodeMask[Private->BitsPerPixel];
+
+ return EGifCompressLine(GifFile, &Pixel, 1);
+}
+
+/******************************************************************************
+ Put a comment into GIF file using the GIF89 comment extension block.
+******************************************************************************/
+int
+EGifPutComment(GifFileType *GifFile, const char *Comment)
+{
+ unsigned int length = strlen(Comment);
+ char *buf;
+
+ length = strlen(Comment);
+ if (length <= 255) {
+ return EGifPutExtension(GifFile, COMMENT_EXT_FUNC_CODE,
+ length, Comment);
+ } else {
+ buf = (char *)Comment;
+ if (EGifPutExtensionLeader(GifFile, COMMENT_EXT_FUNC_CODE)
+ == GIF_ERROR) {
+ return GIF_ERROR;
+ }
+
+ /* Break the comment into 255 byte sub blocks */
+ while (length > 255) {
+ if (EGifPutExtensionBlock(GifFile, 255, buf) == GIF_ERROR) {
+ return GIF_ERROR;
+ }
+ buf = buf + 255;
+ length -= 255;
+ }
+ /* Output any partial block and the clear code. */
+ if (length > 0) {
+ if (EGifPutExtensionBlock(GifFile, length, buf) == GIF_ERROR) {
+ return GIF_ERROR;
+ }
+ }
+ if (EGifPutExtensionTrailer(GifFile) == GIF_ERROR) {
+ return GIF_ERROR;
+ }
+ }
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Begin an extension block (see GIF manual). More
+ extensions can be dumped using EGifPutExtensionBlock until
+ EGifPutExtensionTrailer is invoked.
+******************************************************************************/
+int
+EGifPutExtensionLeader(GifFileType *GifFile, const int ExtCode)
+{
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ Buf[0] = EXTENSION_INTRODUCER;
+ Buf[1] = ExtCode;
+ InternalWrite(GifFile, Buf, 2);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Put extension block data (see GIF manual) into a GIF file.
+******************************************************************************/
+int
+EGifPutExtensionBlock(GifFileType *GifFile,
+ const int ExtLen,
+ const void *Extension)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ Buf = ExtLen;
+ InternalWrite(GifFile, &Buf, 1);
+ InternalWrite(GifFile, Extension, ExtLen);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Put a terminating block (see GIF manual) into a GIF file.
+******************************************************************************/
+int
+EGifPutExtensionTrailer(GifFileType *GifFile) {
+
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ /* Write the block terminator */
+ Buf = 0;
+ InternalWrite(GifFile, &Buf, 1);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Put an extension block (see GIF manual) into a GIF file.
+ Warning: This function is only useful for Extension blocks that have at
+ most one subblock. Extensions with more than one subblock need to use the
+ EGifPutExtension{Leader,Block,Trailer} functions instead.
+******************************************************************************/
+int
+EGifPutExtension(GifFileType *GifFile,
+ const int ExtCode,
+ const int ExtLen,
+ const void *Extension) {
+
+ GifByteType Buf[3];
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ if (ExtCode == 0)
+ InternalWrite(GifFile, (GifByteType *)&ExtLen, 1);
+ else {
+ Buf[0] = EXTENSION_INTRODUCER;
+ Buf[1] = ExtCode; /* Extension Label */
+ Buf[2] = ExtLen; /* Extension length */
+ InternalWrite(GifFile, Buf, 3);
+ }
+ InternalWrite(GifFile, Extension, ExtLen);
+ Buf[0] = 0;
+ InternalWrite(GifFile, Buf, 1);
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Render a Graphics Control Block as raw extension data
+******************************************************************************/
+
+size_t EGifGCBToExtension(const GraphicsControlBlock *GCB,
+ GifByteType *GifExtension)
+{
+ GifExtension[0] = 0;
+ GifExtension[0] |= (GCB->TransparentColor == NO_TRANSPARENT_COLOR) ? 0x00 : 0x01;
+ GifExtension[0] |= GCB->UserInputFlag ? 0x02 : 0x00;
+ GifExtension[0] |= ((GCB->DisposalMode & 0x07) << 2);
+ GifExtension[1] = LOBYTE(GCB->DelayTime);
+ GifExtension[2] = HIBYTE(GCB->DelayTime);
+ GifExtension[3] = (char)GCB->TransparentColor;
+ return 4;
+}
+
+/******************************************************************************
+ Replace the Graphics Control Block for a saved image, if it exists.
+******************************************************************************/
+
+int EGifGCBToSavedExtension(const GraphicsControlBlock *GCB,
+ GifFileType *GifFile, int ImageIndex)
+{
+ int i;
+ size_t Len;
+ GifByteType buf[sizeof(GraphicsControlBlock)]; /* a bit dodgy... */
+
+ if (ImageIndex < 0 || ImageIndex > GifFile->ImageCount - 1)
+ return GIF_ERROR;
+
+ for (i = 0; i < GifFile->SavedImages[ImageIndex].ExtensionBlockCount; i++) {
+ ExtensionBlock *ep = &GifFile->SavedImages[ImageIndex].ExtensionBlocks[i];
+ if (ep->Function == GRAPHICS_EXT_FUNC_CODE) {
+ EGifGCBToExtension(GCB, ep->Bytes);
+ return GIF_OK;
+ }
+ }
+
+ Len = EGifGCBToExtension(GCB, (GifByteType *)buf);
+ if (GifAddExtensionBlock(&GifFile->SavedImages[ImageIndex].ExtensionBlockCount,
+ &GifFile->SavedImages[ImageIndex].ExtensionBlocks,
+ GRAPHICS_EXT_FUNC_CODE,
+ Len,
+ (unsigned char *)buf) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ return (GIF_OK);
+}
+
+/******************************************************************************
+ Put the image code in compressed form. This routine can be called if the
+ information needed to be piped out as is. Obviously this is much faster
+ than decoding and encoding again. This routine should be followed by calls
+ to EGifPutCodeNext, until NULL block is given.
+ The block should NOT be freed by the user (not dynamically allocated).
+******************************************************************************/
+int
+EGifPutCode(GifFileType *GifFile, int CodeSize, const GifByteType *CodeBlock)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ /* No need to dump code size as Compression set up does any for us: */
+ /*
+ * Buf = CodeSize;
+ * if (InternalWrite(GifFile, &Buf, 1) != 1) {
+ * GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ * return GIF_ERROR;
+ * }
+ */
+
+ return EGifPutCodeNext(GifFile, CodeBlock);
+}
+
+/******************************************************************************
+ Continue to put the image code in compressed form. This routine should be
+ called with blocks of code as read via DGifGetCode/DGifGetCodeNext. If
+ given buffer pointer is NULL, empty block is written to mark end of code.
+******************************************************************************/
+int
+EGifPutCodeNext(GifFileType *GifFile, const GifByteType *CodeBlock)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *)GifFile->Private;
+
+ if (CodeBlock != NULL) {
+ if (InternalWrite(GifFile, CodeBlock, CodeBlock[0] + 1)
+ != (unsigned)(CodeBlock[0] + 1)) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ } else {
+ Buf = 0;
+ if (InternalWrite(GifFile, &Buf, 1) != 1) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ Private->PixelCount = 0; /* And local info. indicate image read. */
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine should be called last, to close the GIF file.
+******************************************************************************/
+int
+EGifCloseFile(GifFileType *GifFile)
+{
+ GifByteType Buf;
+ GifFilePrivateType *Private;
+ FILE *File;
+
+ if (GifFile == NULL)
+ return GIF_ERROR;
+
+ Private = (GifFilePrivateType *) GifFile->Private;
+ if (Private == NULL)
+ return GIF_ERROR;
+ if (!IS_WRITEABLE(Private)) {
+ /* This file was NOT open for writing: */
+ GifFile->Error = E_GIF_ERR_NOT_WRITEABLE;
+ return GIF_ERROR;
+ }
+
+ File = Private->File;
+
+ Buf = TERMINATOR_INTRODUCER;
+ InternalWrite(GifFile, &Buf, 1);
+
+ if (GifFile->Image.ColorMap) {
+ GifFreeMapObject(GifFile->Image.ColorMap);
+ GifFile->Image.ColorMap = NULL;
+ }
+ if (GifFile->SColorMap) {
+ GifFreeMapObject(GifFile->SColorMap);
+ GifFile->SColorMap = NULL;
+ }
+ if (Private) {
+ if (Private->HashTable) {
+ free((char *) Private->HashTable);
+ }
+ free((char *) Private);
+ }
+
+ if (File && fclose(File) != 0) {
+ GifFile->Error = E_GIF_ERR_CLOSE_FAILED;
+ return GIF_ERROR;
+ }
+
+ /*
+ * Without the #ifndef, we get spurious warnings because Coverity mistakenly
+ * thinks the GIF structure is freed on an error return.
+ */
+#ifndef __COVERITY__
+ free(GifFile);
+#endif /* __COVERITY__ */
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Put 2 bytes (a word) into the given file in little-endian order:
+******************************************************************************/
+static int
+EGifPutWord(int Word, GifFileType *GifFile)
+{
+ unsigned char c[2];
+
+ c[0] = LOBYTE(Word);
+ c[1] = HIBYTE(Word);
+ if (InternalWrite(GifFile, c, 2) == 2)
+ return GIF_OK;
+ else
+ return GIF_ERROR;
+}
+
+/******************************************************************************
+ Setup the LZ compression for this image:
+******************************************************************************/
+static int
+EGifSetupCompress(GifFileType *GifFile)
+{
+ int BitsPerPixel;
+ GifByteType Buf;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ /* Test and see what color map to use, and from it # bits per pixel: */
+ if (GifFile->Image.ColorMap)
+ BitsPerPixel = GifFile->Image.ColorMap->BitsPerPixel;
+ else if (GifFile->SColorMap)
+ BitsPerPixel = GifFile->SColorMap->BitsPerPixel;
+ else {
+ GifFile->Error = E_GIF_ERR_NO_COLOR_MAP;
+ return GIF_ERROR;
+ }
+
+ Buf = BitsPerPixel = (BitsPerPixel < 2 ? 2 : BitsPerPixel);
+ InternalWrite(GifFile, &Buf, 1); /* Write the Code size to file. */
+
+ Private->Buf[0] = 0; /* Nothing was output yet. */
+ Private->BitsPerPixel = BitsPerPixel;
+ Private->ClearCode = (1 << BitsPerPixel);
+ Private->EOFCode = Private->ClearCode + 1;
+ Private->RunningCode = Private->EOFCode + 1;
+ Private->RunningBits = BitsPerPixel + 1; /* Number of bits per code. */
+ Private->MaxCode1 = 1 << Private->RunningBits; /* Max. code + 1. */
+ Private->CrntCode = FIRST_CODE; /* Signal that this is first one! */
+ Private->CrntShiftState = 0; /* No information in CrntShiftDWord. */
+ Private->CrntShiftDWord = 0;
+
+ /* Clear hash table and send Clear to make sure the decoder do the same. */
+ _ClearHashTable(Private->HashTable);
+
+ if (EGifCompressOutput(GifFile, Private->ClearCode) == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ return GIF_OK;
+}
+
+/******************************************************************************
+ The LZ compression routine:
+ This version compresses the given buffer Line of length LineLen.
+ This routine can be called a few times (one per scan line, for example), in
+ order to complete the whole image.
+******************************************************************************/
+static int
+EGifCompressLine(GifFileType *GifFile,
+ GifPixelType *Line,
+ const int LineLen)
+{
+ int i = 0, CrntCode, NewCode;
+ unsigned long NewKey;
+ GifPixelType Pixel;
+ GifHashTableType *HashTable;
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+
+ HashTable = Private->HashTable;
+
+ if (Private->CrntCode == FIRST_CODE) /* Its first time! */
+ CrntCode = Line[i++];
+ else
+ CrntCode = Private->CrntCode; /* Get last code in compression. */
+
+ while (i < LineLen) { /* Decode LineLen items. */
+ Pixel = Line[i++]; /* Get next pixel from stream. */
+ /* Form a new unique key to search hash table for the code combines
+ * CrntCode as Prefix string with Pixel as postfix char.
+ */
+ NewKey = (((uint32_t) CrntCode) << 8) + Pixel;
+ if ((NewCode = _ExistsHashTable(HashTable, NewKey)) >= 0) {
+ /* This Key is already there, or the string is old one, so
+ * simple take new code as our CrntCode:
+ */
+ CrntCode = NewCode;
+ } else {
+ /* Put it in hash table, output the prefix code, and make our
+ * CrntCode equal to Pixel.
+ */
+ if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ CrntCode = Pixel;
+
+ /* If however the HashTable if full, we send a clear first and
+ * Clear the hash table.
+ */
+ if (Private->RunningCode >= LZ_MAX_CODE) {
+ /* Time to do some clearance: */
+ if (EGifCompressOutput(GifFile, Private->ClearCode)
+ == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ Private->RunningCode = Private->EOFCode + 1;
+ Private->RunningBits = Private->BitsPerPixel + 1;
+ Private->MaxCode1 = 1 << Private->RunningBits;
+ _ClearHashTable(HashTable);
+ } else {
+ /* Put this unique key with its relative Code in hash table: */
+ _InsertHashTable(HashTable, NewKey, Private->RunningCode++);
+ }
+ }
+
+ }
+
+ /* Preserve the current state of the compression algorithm: */
+ Private->CrntCode = CrntCode;
+
+ if (Private->PixelCount == 0) {
+ /* We are done - output last Code and flush output buffers: */
+ if (EGifCompressOutput(GifFile, CrntCode) == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ if (EGifCompressOutput(GifFile, Private->EOFCode) == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ if (EGifCompressOutput(GifFile, FLUSH_OUTPUT) == GIF_ERROR) {
+ GifFile->Error = E_GIF_ERR_DISK_IS_FULL;
+ return GIF_ERROR;
+ }
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ The LZ compression output routine:
+ This routine is responsible for the compression of the bit stream into
+ 8 bits (bytes) packets.
+ Returns GIF_OK if written successfully.
+******************************************************************************/
+static int
+EGifCompressOutput(GifFileType *GifFile,
+ const int Code)
+{
+ GifFilePrivateType *Private = (GifFilePrivateType *) GifFile->Private;
+ int retval = GIF_OK;
+
+ if (Code == FLUSH_OUTPUT) {
+ while (Private->CrntShiftState > 0) {
+ /* Get Rid of what is left in DWord, and flush it. */
+ if (EGifBufferedOutput(GifFile, Private->Buf,
+ Private->CrntShiftDWord & 0xff) == GIF_ERROR)
+ retval = GIF_ERROR;
+ Private->CrntShiftDWord >>= 8;
+ Private->CrntShiftState -= 8;
+ }
+ Private->CrntShiftState = 0; /* For next time. */
+ if (EGifBufferedOutput(GifFile, Private->Buf,
+ FLUSH_OUTPUT) == GIF_ERROR)
+ retval = GIF_ERROR;
+ } else {
+ Private->CrntShiftDWord |= ((long)Code) << Private->CrntShiftState;
+ Private->CrntShiftState += Private->RunningBits;
+ while (Private->CrntShiftState >= 8) {
+ /* Dump out full bytes: */
+ if (EGifBufferedOutput(GifFile, Private->Buf,
+ Private->CrntShiftDWord & 0xff) == GIF_ERROR)
+ retval = GIF_ERROR;
+ Private->CrntShiftDWord >>= 8;
+ Private->CrntShiftState -= 8;
+ }
+ }
+
+ /* If code cannt fit into RunningBits bits, must raise its size. Note */
+ /* however that codes above 4095 are used for special signaling. */
+ if (Private->RunningCode >= Private->MaxCode1 && Code <= 4095) {
+ Private->MaxCode1 = 1 << ++Private->RunningBits;
+ }
+
+ return retval;
+}
+
+/******************************************************************************
+ This routines buffers the given characters until 255 characters are ready
+ to be output. If Code is equal to -1 the buffer is flushed (EOF).
+ The buffer is Dumped with first byte as its size, as GIF format requires.
+ Returns GIF_OK if written successfully.
+******************************************************************************/
+static int
+EGifBufferedOutput(GifFileType *GifFile,
+ GifByteType *Buf,
+ int c)
+{
+ if (c == FLUSH_OUTPUT) {
+ /* Flush everything out. */
+ if (Buf[0] != 0
+ && InternalWrite(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ /* Mark end of compressed data, by an empty block (see GIF doc): */
+ Buf[0] = 0;
+ if (InternalWrite(GifFile, Buf, 1) != 1) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ } else {
+ if (Buf[0] == 255) {
+ /* Dump out this buffer - it is full: */
+ if (InternalWrite(GifFile, Buf, Buf[0] + 1) != (unsigned)(Buf[0] + 1)) {
+ GifFile->Error = E_GIF_ERR_WRITE_FAILED;
+ return GIF_ERROR;
+ }
+ Buf[0] = 0;
+ }
+ Buf[++Buf[0]] = c;
+ }
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ This routine writes to disk an in-core representation of a GIF previously
+ created by DGifSlurp().
+******************************************************************************/
+
+static int
+EGifWriteExtensions(GifFileType *GifFileOut,
+ ExtensionBlock *ExtensionBlocks,
+ int ExtensionBlockCount)
+{
+ if (ExtensionBlocks) {
+ ExtensionBlock *ep;
+ int j;
+
+ for (j = 0; j < ExtensionBlockCount; j++) {
+ ep = &ExtensionBlocks[j];
+ if (ep->Function != CONTINUE_EXT_FUNC_CODE)
+ if (EGifPutExtensionLeader(GifFileOut, ep->Function) == GIF_ERROR)
+ return (GIF_ERROR);
+ if (EGifPutExtensionBlock(GifFileOut, ep->ByteCount, ep->Bytes) == GIF_ERROR)
+ return (GIF_ERROR);
+ if (j == ExtensionBlockCount - 1 || (ep+1)->Function != CONTINUE_EXT_FUNC_CODE)
+ if (EGifPutExtensionTrailer(GifFileOut) == GIF_ERROR)
+ return (GIF_ERROR);
+ }
+ }
+
+ return (GIF_OK);
+}
+
+int
+EGifSpew(GifFileType *GifFileOut)
+{
+ int i, j;
+
+ if (EGifPutScreenDesc(GifFileOut,
+ GifFileOut->SWidth,
+ GifFileOut->SHeight,
+ GifFileOut->SColorResolution,
+ GifFileOut->SBackGroundColor,
+ GifFileOut->SColorMap) == GIF_ERROR) {
+ return (GIF_ERROR);
+ }
+
+ for (i = 0; i < GifFileOut->ImageCount; i++) {
+ SavedImage *sp = &GifFileOut->SavedImages[i];
+ int SavedHeight = sp->ImageDesc.Height;
+ int SavedWidth = sp->ImageDesc.Width;
+
+ /* this allows us to delete images by nuking their rasters */
+ if (sp->RasterBits == NULL)
+ continue;
+
+ if (EGifWriteExtensions(GifFileOut,
+ sp->ExtensionBlocks,
+ sp->ExtensionBlockCount) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ if (EGifPutImageDesc(GifFileOut,
+ sp->ImageDesc.Left,
+ sp->ImageDesc.Top,
+ SavedWidth,
+ SavedHeight,
+ sp->ImageDesc.Interlace,
+ sp->ImageDesc.ColorMap) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ if (sp->ImageDesc.Interlace) {
+ /*
+ * The way an interlaced image should be written -
+ * offsets and jumps...
+ */
+ int InterlacedOffset[] = { 0, 4, 2, 1 };
+ int InterlacedJumps[] = { 8, 8, 4, 2 };
+ int k;
+ /* Need to perform 4 passes on the images: */
+ for (k = 0; k < 4; k++)
+ for (j = InterlacedOffset[k];
+ j < SavedHeight;
+ j += InterlacedJumps[k]) {
+ if (EGifPutLine(GifFileOut,
+ sp->RasterBits + j * SavedWidth,
+ SavedWidth) == GIF_ERROR)
+ return (GIF_ERROR);
+ }
+ } else {
+ for (j = 0; j < SavedHeight; j++) {
+ if (EGifPutLine(GifFileOut,
+ sp->RasterBits + j * SavedWidth,
+ SavedWidth) == GIF_ERROR)
+ return (GIF_ERROR);
+ }
+ }
+ }
+
+ if (EGifWriteExtensions(GifFileOut,
+ GifFileOut->ExtensionBlocks,
+ GifFileOut->ExtensionBlockCount) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ if (EGifCloseFile(GifFileOut) == GIF_ERROR)
+ return (GIF_ERROR);
+
+ return (GIF_OK);
+}
+
+/* end */
diff --git a/giflib/gif_err.c b/giflib/gif_err.c
new file mode 100644
index 0000000..8de72a0
--- /dev/null
+++ b/giflib/gif_err.c
@@ -0,0 +1,97 @@
+/*****************************************************************************
+
+gif_err.c - handle error reporting for the GIF library.
+
+****************************************************************************/
+
+#include <stdio.h>
+
+#include "gif_lib.h"
+#include "gif_lib_private.h"
+
+/*****************************************************************************
+ Return a string description of the last GIF error
+*****************************************************************************/
+char *
+GifErrorString(int ErrorCode)
+{
+ char *Err;
+
+ switch (ErrorCode) {
+ case E_GIF_ERR_OPEN_FAILED:
+ Err = "Failed to open given file";
+ break;
+ case E_GIF_ERR_WRITE_FAILED:
+ Err = "Failed to write to given file";
+ break;
+ case E_GIF_ERR_HAS_SCRN_DSCR:
+ Err = "Screen descriptor has already been set";
+ break;
+ case E_GIF_ERR_HAS_IMAG_DSCR:
+ Err = "Image descriptor is still active";
+ break;
+ case E_GIF_ERR_NO_COLOR_MAP:
+ Err = "Neither global nor local color map";
+ break;
+ case E_GIF_ERR_DATA_TOO_BIG:
+ Err = "Number of pixels bigger than width * height";
+ break;
+ case E_GIF_ERR_NOT_ENOUGH_MEM:
+ Err = "Failed to allocate required memory";
+ break;
+ case E_GIF_ERR_DISK_IS_FULL:
+ Err = "Write failed (disk full?)";
+ break;
+ case E_GIF_ERR_CLOSE_FAILED:
+ Err = "Failed to close given file";
+ break;
+ case E_GIF_ERR_NOT_WRITEABLE:
+ Err = "Given file was not opened for write";
+ break;
+ case D_GIF_ERR_OPEN_FAILED:
+ Err = "Failed to open given file";
+ break;
+ case D_GIF_ERR_READ_FAILED:
+ Err = "Failed to read from given file";
+ break;
+ case D_GIF_ERR_NOT_GIF_FILE:
+ Err = "Data is not in GIF format";
+ break;
+ case D_GIF_ERR_NO_SCRN_DSCR:
+ Err = "No screen descriptor detected";
+ break;
+ case D_GIF_ERR_NO_IMAG_DSCR:
+ Err = "No Image Descriptor detected";
+ break;
+ case D_GIF_ERR_NO_COLOR_MAP:
+ Err = "Neither global nor local color map";
+ break;
+ case D_GIF_ERR_WRONG_RECORD:
+ Err = "Wrong record type detected";
+ break;
+ case D_GIF_ERR_DATA_TOO_BIG:
+ Err = "Number of pixels bigger than width * height";
+ break;
+ case D_GIF_ERR_NOT_ENOUGH_MEM:
+ Err = "Failed to allocate required memory";
+ break;
+ case D_GIF_ERR_CLOSE_FAILED:
+ Err = "Failed to close given file";
+ break;
+ case D_GIF_ERR_NOT_READABLE:
+ Err = "Given file was not opened for read";
+ break;
+ case D_GIF_ERR_IMAGE_DEFECT:
+ Err = "Image is defective, decoding aborted";
+ break;
+ case D_GIF_ERR_EOF_TOO_SOON:
+ Err = "Image EOF detected before image complete";
+ break;
+ default:
+ Err = NULL;
+ break;
+ }
+ return Err;
+}
+
+/* end */
diff --git a/giflib/gif_hash.c b/giflib/gif_hash.c
new file mode 100644
index 0000000..61a4d13
--- /dev/null
+++ b/giflib/gif_hash.c
@@ -0,0 +1,132 @@
+/*****************************************************************************
+
+gif_hash.c -- module to support the following operations:
+
+1. InitHashTable - initialize hash table.
+2. ClearHashTable - clear the hash table to an empty state.
+2. InsertHashTable - insert one item into data structure.
+3. ExistsHashTable - test if item exists in data structure.
+
+This module is used to hash the GIF codes during encoding.
+
+*****************************************************************************/
+
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "gif_lib.h"
+#include "gif_hash.h"
+#include "gif_lib_private.h"
+
+/* #define DEBUG_HIT_RATE Debug number of misses per hash Insert/Exists. */
+
+#ifdef DEBUG_HIT_RATE
+static long NumberOfTests = 0,
+ NumberOfMisses = 0;
+#endif /* DEBUG_HIT_RATE */
+
+static int KeyItem(uint32_t Item);
+
+/******************************************************************************
+ Initialize HashTable - allocate the memory needed and clear it. *
+******************************************************************************/
+GifHashTableType *_InitHashTable(void)
+{
+ GifHashTableType *HashTable;
+
+ if ((HashTable = (GifHashTableType *) malloc(sizeof(GifHashTableType)))
+ == NULL)
+ return NULL;
+
+ _ClearHashTable(HashTable);
+
+ return HashTable;
+}
+
+/******************************************************************************
+ Routine to clear the HashTable to an empty state. *
+ This part is a little machine depended. Use the commented part otherwise. *
+******************************************************************************/
+void _ClearHashTable(GifHashTableType *HashTable)
+{
+ memset(HashTable -> HTable, 0xFF, HT_SIZE * sizeof(uint32_t));
+}
+
+/******************************************************************************
+ Routine to insert a new Item into the HashTable. The data is assumed to be *
+ new one. *
+******************************************************************************/
+void _InsertHashTable(GifHashTableType *HashTable, uint32_t Key, int Code)
+{
+ int HKey = KeyItem(Key);
+ uint32_t *HTable = HashTable -> HTable;
+
+#ifdef DEBUG_HIT_RATE
+ NumberOfTests++;
+ NumberOfMisses++;
+#endif /* DEBUG_HIT_RATE */
+
+ while (HT_GET_KEY(HTable[HKey]) != 0xFFFFFL) {
+#ifdef DEBUG_HIT_RATE
+ NumberOfMisses++;
+#endif /* DEBUG_HIT_RATE */
+ HKey = (HKey + 1) & HT_KEY_MASK;
+ }
+ HTable[HKey] = HT_PUT_KEY(Key) | HT_PUT_CODE(Code);
+}
+
+/******************************************************************************
+ Routine to test if given Key exists in HashTable and if so returns its code *
+ Returns the Code if key was found, -1 if not. *
+******************************************************************************/
+int _ExistsHashTable(GifHashTableType *HashTable, uint32_t Key)
+{
+ int HKey = KeyItem(Key);
+ uint32_t *HTable = HashTable -> HTable, HTKey;
+
+#ifdef DEBUG_HIT_RATE
+ NumberOfTests++;
+ NumberOfMisses++;
+#endif /* DEBUG_HIT_RATE */
+
+ while ((HTKey = HT_GET_KEY(HTable[HKey])) != 0xFFFFFL) {
+#ifdef DEBUG_HIT_RATE
+ NumberOfMisses++;
+#endif /* DEBUG_HIT_RATE */
+ if (Key == HTKey) return HT_GET_CODE(HTable[HKey]);
+ HKey = (HKey + 1) & HT_KEY_MASK;
+ }
+
+ return -1;
+}
+
+/******************************************************************************
+ Routine to generate an HKey for the hashtable out of the given unique key. *
+ The given Key is assumed to be 20 bits as follows: lower 8 bits are the *
+ new postfix character, while the upper 12 bits are the prefix code. *
+ Because the average hit ratio is only 2 (2 hash references per entry), *
+ evaluating more complex keys (such as twin prime keys) does not worth it! *
+******************************************************************************/
+static int KeyItem(uint32_t Item)
+{
+ return ((Item >> 12) ^ Item) & HT_KEY_MASK;
+}
+
+#ifdef DEBUG_HIT_RATE
+/******************************************************************************
+ Debugging routine to print the hit ratio - number of times the hash table *
+ was tested per operation. This routine was used to test the KeyItem routine *
+******************************************************************************/
+void HashTablePrintHitRatio(void)
+{
+ printf("Hash Table Hit Ratio is %ld/%ld = %ld%%.\n",
+ NumberOfMisses, NumberOfTests,
+ NumberOfMisses * 100 / NumberOfTests);
+}
+#endif /* DEBUG_HIT_RATE */
+
+/* end */
diff --git a/giflib/gif_hash.h b/giflib/gif_hash.h
new file mode 100644
index 0000000..ac20a43
--- /dev/null
+++ b/giflib/gif_hash.h
@@ -0,0 +1,39 @@
+/******************************************************************************
+
+gif_hash.h - magfic constants and declarations for GIF LZW
+
+******************************************************************************/
+
+#ifndef _GIF_HASH_H_
+#define _GIF_HASH_H_
+
+#include <unistd.h>
+#include <stdint.h>
+
+#define HT_SIZE 8192 /* 12bits = 4096 or twice as big! */
+#define HT_KEY_MASK 0x1FFF /* 13bits keys */
+#define HT_KEY_NUM_BITS 13 /* 13bits keys */
+#define HT_MAX_KEY 8191 /* 13bits - 1, maximal code possible */
+#define HT_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+
+/* The 32 bits of the long are divided into two parts for the key & code: */
+/* 1. The code is 12 bits as our compression algorithm is limited to 12bits */
+/* 2. The key is 12 bits Prefix code + 8 bit new char or 20 bits. */
+/* The key is the upper 20 bits. The code is the lower 12. */
+#define HT_GET_KEY(l) (l >> 12)
+#define HT_GET_CODE(l) (l & 0x0FFF)
+#define HT_PUT_KEY(l) (l << 12)
+#define HT_PUT_CODE(l) (l & 0x0FFF)
+
+typedef struct GifHashTableType {
+ uint32_t HTable[HT_SIZE];
+} GifHashTableType;
+
+GifHashTableType *_InitHashTable(void);
+void _ClearHashTable(GifHashTableType *HashTable);
+void _InsertHashTable(GifHashTableType *HashTable, uint32_t Key, int Code);
+int _ExistsHashTable(GifHashTableType *HashTable, uint32_t Key);
+
+#endif /* _GIF_HASH_H_ */
+
+/* end */
diff --git a/giflib/gif_lib.h b/giflib/gif_lib.h
new file mode 100644
index 0000000..23df861
--- /dev/null
+++ b/giflib/gif_lib.h
@@ -0,0 +1,281 @@
+/******************************************************************************
+
+gif_lib.h - service library for decoding and encoding GIF images
+
+*****************************************************************************/
+
+#ifndef _GIF_LIB_H_
+#define _GIF_LIB_H_ 1
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#define GIFLIB_MAJOR 5
+#define GIFLIB_MINOR 0
+#define GIFLIB_RELEASE 4
+
+#define GIF_ERROR 0
+#define GIF_OK 1
+
+#include <stdbool.h>
+
+#define GIF_STAMP "GIFVER" /* First chars in file - GIF stamp. */
+#define GIF_STAMP_LEN sizeof(GIF_STAMP) - 1
+#define GIF_VERSION_POS 3 /* Version first character in stamp. */
+#define GIF87_STAMP "GIF87a" /* First chars in file - GIF stamp. */
+#define GIF89_STAMP "GIF89a" /* First chars in file - GIF stamp. */
+
+typedef unsigned char GifPixelType;
+typedef unsigned char *GifRowType;
+typedef unsigned char GifByteType;
+typedef unsigned int GifPrefixType;
+typedef int GifWord;
+
+typedef struct GifColorType {
+ GifByteType Red, Green, Blue;
+} GifColorType;
+
+typedef struct ColorMapObject {
+ int ColorCount;
+ int BitsPerPixel;
+ bool SortFlag;
+ GifColorType *Colors; /* on malloc(3) heap */
+} ColorMapObject;
+
+typedef struct GifImageDesc {
+ GifWord Left, Top, Width, Height; /* Current image dimensions. */
+ bool Interlace; /* Sequential/Interlaced lines. */
+ ColorMapObject *ColorMap; /* The local color map */
+} GifImageDesc;
+
+typedef struct ExtensionBlock {
+ int ByteCount;
+ GifByteType *Bytes; /* on malloc(3) heap */
+ int Function; /* The block function code */
+#define CONTINUE_EXT_FUNC_CODE 0x00 /* continuation subblock */
+#define COMMENT_EXT_FUNC_CODE 0xfe /* comment */
+#define GRAPHICS_EXT_FUNC_CODE 0xf9 /* graphics control (GIF89) */
+#define PLAINTEXT_EXT_FUNC_CODE 0x01 /* plaintext */
+#define APPLICATION_EXT_FUNC_CODE 0xff /* application block */
+} ExtensionBlock;
+
+typedef struct SavedImage {
+ GifImageDesc ImageDesc;
+ GifByteType *RasterBits; /* on malloc(3) heap */
+ int ExtensionBlockCount; /* Count of extensions before image */
+ ExtensionBlock *ExtensionBlocks; /* Extensions before image */
+} SavedImage;
+
+typedef struct GifFileType {
+ GifWord SWidth, SHeight; /* Size of virtual canvas */
+ GifWord SColorResolution; /* How many colors can we generate? */
+ GifWord SBackGroundColor; /* Background color for virtual canvas */
+ GifByteType AspectByte; /* Used to compute pixel aspect ratio */
+ ColorMapObject *SColorMap; /* Global colormap, NULL if nonexistent. */
+ int ImageCount; /* Number of current image (both APIs) */
+ GifImageDesc Image; /* Current image (low-level API) */
+ SavedImage *SavedImages; /* Image sequence (high-level API) */
+ int ExtensionBlockCount; /* Count extensions past last image */
+ ExtensionBlock *ExtensionBlocks; /* Extensions past last image */
+ int Error; /* Last error condition reported */
+ void *UserData; /* hook to attach user data (TVT) */
+ void *Private; /* Don't mess with this! */
+} GifFileType;
+
+#define GIF_ASPECT_RATIO(n) ((n)+15.0/64.0)
+
+typedef enum {
+ UNDEFINED_RECORD_TYPE,
+ SCREEN_DESC_RECORD_TYPE,
+ IMAGE_DESC_RECORD_TYPE, /* Begin with ',' */
+ EXTENSION_RECORD_TYPE, /* Begin with '!' */
+ TERMINATE_RECORD_TYPE /* Begin with ';' */
+} GifRecordType;
+
+/* func type to read gif data from arbitrary sources (TVT) */
+typedef int (*InputFunc) (GifFileType *, GifByteType *, int);
+
+/* func type to write gif data to arbitrary targets.
+ * Returns count of bytes written. (MRB)
+ */
+typedef int (*OutputFunc) (GifFileType *, const GifByteType *, int);
+
+/******************************************************************************
+ GIF89 structures
+******************************************************************************/
+
+typedef struct GraphicsControlBlock {
+ int DisposalMode;
+#define DISPOSAL_UNSPECIFIED 0 /* No disposal specified. */
+#define DISPOSE_DO_NOT 1 /* Leave image in place */
+#define DISPOSE_BACKGROUND 2 /* Set area too background color */
+#define DISPOSE_PREVIOUS 3 /* Restore to previous content */
+ bool UserInputFlag; /* User confirmation required before disposal */
+ int DelayTime; /* pre-display delay in 0.01sec units */
+ int TransparentColor; /* Palette index for transparency, -1 if none */
+#define NO_TRANSPARENT_COLOR -1
+} GraphicsControlBlock;
+
+/******************************************************************************
+ GIF encoding routines
+******************************************************************************/
+
+/* Main entry points */
+GifFileType *EGifOpenFileName(const char *GifFileName,
+ const bool GifTestExistence, int *Error);
+GifFileType *EGifOpenFileHandle(const int GifFileHandle, int *Error);
+GifFileType *EGifOpen(void *userPtr, OutputFunc writeFunc, int *Error);
+int EGifSpew(GifFileType * GifFile);
+char *EGifGetGifVersion(GifFileType *GifFile); /* new in 5.x */
+int EGifCloseFile(GifFileType * GifFile);
+
+#define E_GIF_ERR_OPEN_FAILED 1 /* And EGif possible errors. */
+#define E_GIF_ERR_WRITE_FAILED 2
+#define E_GIF_ERR_HAS_SCRN_DSCR 3
+#define E_GIF_ERR_HAS_IMAG_DSCR 4
+#define E_GIF_ERR_NO_COLOR_MAP 5
+#define E_GIF_ERR_DATA_TOO_BIG 6
+#define E_GIF_ERR_NOT_ENOUGH_MEM 7
+#define E_GIF_ERR_DISK_IS_FULL 8
+#define E_GIF_ERR_CLOSE_FAILED 9
+#define E_GIF_ERR_NOT_WRITEABLE 10
+
+/* These are legacy. You probably do not want to call them directly */
+int EGifPutScreenDesc(GifFileType *GifFile,
+ const int GifWidth, const int GifHeight,
+ const int GifColorRes,
+ const int GifBackGround,
+ const ColorMapObject *GifColorMap);
+int EGifPutImageDesc(GifFileType *GifFile,
+ const int GifLeft, const int GifTop,
+ const int GifWidth, const int GifHeight,
+ const bool GifInterlace,
+ const ColorMapObject *GifColorMap);
+void EGifSetGifVersion(GifFileType *GifFile, const bool gif89);
+int EGifPutLine(GifFileType *GifFile, GifPixelType *GifLine,
+ int GifLineLen);
+int EGifPutPixel(GifFileType *GifFile, const GifPixelType GifPixel);
+int EGifPutComment(GifFileType *GifFile, const char *GifComment);
+int EGifPutExtensionLeader(GifFileType *GifFile, const int GifExtCode);
+int EGifPutExtensionBlock(GifFileType *GifFile,
+ const int GifExtLen, const void *GifExtension);
+int EGifPutExtensionTrailer(GifFileType *GifFile);
+int EGifPutExtension(GifFileType *GifFile, const int GifExtCode,
+ const int GifExtLen,
+ const void *GifExtension);
+int EGifPutCode(GifFileType *GifFile, int GifCodeSize,
+ const GifByteType *GifCodeBlock);
+int EGifPutCodeNext(GifFileType *GifFile,
+ const GifByteType *GifCodeBlock);
+
+/******************************************************************************
+ GIF decoding routines
+******************************************************************************/
+
+/* Main entry points */
+GifFileType *DGifOpenFileName(const char *GifFileName, int *Error);
+GifFileType *DGifOpenFileHandle(int GifFileHandle, int *Error);
+int DGifSlurp(GifFileType * GifFile);
+GifFileType *DGifOpen(void *userPtr, InputFunc readFunc, int *Error); /* new one (TVT) */
+int DGifCloseFile(GifFileType * GifFile);
+
+#define D_GIF_ERR_OPEN_FAILED 101 /* And DGif possible errors. */
+#define D_GIF_ERR_READ_FAILED 102
+#define D_GIF_ERR_NOT_GIF_FILE 103
+#define D_GIF_ERR_NO_SCRN_DSCR 104
+#define D_GIF_ERR_NO_IMAG_DSCR 105
+#define D_GIF_ERR_NO_COLOR_MAP 106
+#define D_GIF_ERR_WRONG_RECORD 107
+#define D_GIF_ERR_DATA_TOO_BIG 108
+#define D_GIF_ERR_NOT_ENOUGH_MEM 109
+#define D_GIF_ERR_CLOSE_FAILED 110
+#define D_GIF_ERR_NOT_READABLE 111
+#define D_GIF_ERR_IMAGE_DEFECT 112
+#define D_GIF_ERR_EOF_TOO_SOON 113
+
+/* These are legacy. You probably do not want to call them directly */
+int DGifGetScreenDesc(GifFileType *GifFile);
+int DGifGetRecordType(GifFileType *GifFile, GifRecordType *GifType);
+int DGifGetImageDesc(GifFileType *GifFile);
+int DGifGetLine(GifFileType *GifFile, GifPixelType *GifLine, int GifLineLen);
+int DGifGetPixel(GifFileType *GifFile, GifPixelType GifPixel);
+int DGifGetComment(GifFileType *GifFile, char *GifComment);
+int DGifGetExtension(GifFileType *GifFile, int *GifExtCode,
+ GifByteType **GifExtension);
+int DGifGetExtensionNext(GifFileType *GifFile, GifByteType **GifExtension);
+int DGifGetCode(GifFileType *GifFile, int *GifCodeSize,
+ GifByteType **GifCodeBlock);
+int DGifGetCodeNext(GifFileType *GifFile, GifByteType **GifCodeBlock);
+int DGifGetLZCodes(GifFileType *GifFile, int *GifCode);
+
+
+/******************************************************************************
+ Color table quantization (deprecated)
+******************************************************************************/
+int GifQuantizeBuffer(unsigned int Width, unsigned int Height,
+ int *ColorMapSize, GifByteType * RedInput,
+ GifByteType * GreenInput, GifByteType * BlueInput,
+ GifByteType * OutputBuffer,
+ GifColorType * OutputColorMap);
+
+/******************************************************************************
+ Error handling and reporting.
+******************************************************************************/
+extern char *GifErrorString(int ErrorCode); /* new in 2012 - ESR */
+
+/*****************************************************************************
+ Everything below this point is new after version 1.2, supporting `slurp
+ mode' for doing I/O in two big belts with all the image-bashing in core.
+******************************************************************************/
+
+/******************************************************************************
+ Color map handling from gif_alloc.c
+******************************************************************************/
+
+extern ColorMapObject *GifMakeMapObject(int ColorCount,
+ const GifColorType *ColorMap);
+extern void GifFreeMapObject(ColorMapObject *Object);
+extern ColorMapObject *GifUnionColorMap(const ColorMapObject *ColorIn1,
+ const ColorMapObject *ColorIn2,
+ GifPixelType ColorTransIn2[]);
+extern int GifBitSize(int n);
+
+/******************************************************************************
+ Support for the in-core structures allocation (slurp mode).
+******************************************************************************/
+
+extern void GifApplyTranslation(SavedImage *Image, GifPixelType Translation[]);
+extern int GifAddExtensionBlock(int *ExtensionBlock_Count,
+ ExtensionBlock **ExtensionBlocks,
+ int Function,
+ unsigned int Len, unsigned char ExtData[]);
+extern void GifFreeExtensions(int *ExtensionBlock_Count,
+ ExtensionBlock **ExtensionBlocks);
+extern SavedImage *GifMakeSavedImage(GifFileType *GifFile,
+ const SavedImage *CopyFrom);
+extern void GifFreeSavedImages(GifFileType *GifFile);
+
+/******************************************************************************
+ 5.x functions for GIF89 graphics control blocks
+******************************************************************************/
+
+int DGifExtensionToGCB(const size_t GifExtensionLength,
+ const GifByteType *GifExtension,
+ GraphicsControlBlock *GCB);
+size_t EGifGCBToExtension(const GraphicsControlBlock *GCB,
+ GifByteType *GifExtension);
+
+int DGifSavedExtensionToGCB(GifFileType *GifFile,
+ int ImageIndex,
+ GraphicsControlBlock *GCB);
+int EGifGCBToSavedExtension(const GraphicsControlBlock *GCB,
+ GifFileType *GifFile,
+ int ImageIndex);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* _GIF_LIB_H */
+
+/* end */
diff --git a/giflib/gif_lib_private.h b/giflib/gif_lib_private.h
new file mode 100644
index 0000000..adaf557
--- /dev/null
+++ b/giflib/gif_lib_private.h
@@ -0,0 +1,59 @@
+/****************************************************************************
+
+gif_lib_private.h - internal giflib routines and structures
+
+****************************************************************************/
+
+#ifndef _GIF_LIB_PRIVATE_H
+#define _GIF_LIB_PRIVATE_H
+
+#include "gif_lib.h"
+#include "gif_hash.h"
+
+#define EXTENSION_INTRODUCER 0x21
+#define DESCRIPTOR_INTRODUCER 0x2c
+#define TERMINATOR_INTRODUCER 0x3b
+
+#define LZ_MAX_CODE 4095 /* Biggest code possible in 12 bits. */
+#define LZ_BITS 12
+
+#define FLUSH_OUTPUT 4096 /* Impossible code, to signal flush. */
+#define FIRST_CODE 4097 /* Impossible code, to signal first. */
+#define NO_SUCH_CODE 4098 /* Impossible code, to signal empty. */
+
+#define FILE_STATE_WRITE 0x01
+#define FILE_STATE_SCREEN 0x02
+#define FILE_STATE_IMAGE 0x04
+#define FILE_STATE_READ 0x08
+
+#define IS_READABLE(Private) (Private->FileState & FILE_STATE_READ)
+#define IS_WRITEABLE(Private) (Private->FileState & FILE_STATE_WRITE)
+
+typedef struct GifFilePrivateType {
+ GifWord FileState, FileHandle, /* Where all this data goes to! */
+ BitsPerPixel, /* Bits per pixel (Codes uses at least this + 1). */
+ ClearCode, /* The CLEAR LZ code. */
+ EOFCode, /* The EOF LZ code. */
+ RunningCode, /* The next code algorithm can generate. */
+ RunningBits, /* The number of bits required to represent RunningCode. */
+ MaxCode1, /* 1 bigger than max. possible code, in RunningBits bits. */
+ LastCode, /* The code before the current code. */
+ CrntCode, /* Current algorithm code. */
+ StackPtr, /* For character stack (see below). */
+ CrntShiftState; /* Number of bits in CrntShiftDWord. */
+ unsigned long CrntShiftDWord; /* For bytes decomposition into codes. */
+ unsigned long PixelCount; /* Number of pixels in image. */
+ FILE *File; /* File as stream. */
+ InputFunc Read; /* function to read gif input (TVT) */
+ OutputFunc Write; /* function to write gif output (MRB) */
+ GifByteType Buf[256]; /* Compressed input is buffered here. */
+ GifByteType Stack[LZ_MAX_CODE]; /* Decoded pixels are stacked here. */
+ GifByteType Suffix[LZ_MAX_CODE + 1]; /* So we can trace the codes. */
+ GifPrefixType Prefix[LZ_MAX_CODE + 1];
+ GifHashTableType *HashTable;
+ bool gif89;
+} GifFilePrivateType;
+
+#endif /* _GIF_LIB_PRIVATE_H */
+
+/* end */
diff --git a/giflib/gifalloc.c b/giflib/gifalloc.c
new file mode 100644
index 0000000..4cb8cde
--- /dev/null
+++ b/giflib/gifalloc.c
@@ -0,0 +1,402 @@
+/*****************************************************************************
+
+ GIF construction tools
+
+****************************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "gif_lib.h"
+
+#define MAX(x, y) (((x) > (y)) ? (x) : (y))
+
+/******************************************************************************
+ Miscellaneous utility functions
+******************************************************************************/
+
+/* return smallest bitfield size n will fit in */
+int
+GifBitSize(int n)
+{
+ register int i;
+
+ for (i = 1; i <= 8; i++)
+ if ((1 << i) >= n)
+ break;
+ return (i);
+}
+
+/******************************************************************************
+ Color map object functions
+******************************************************************************/
+
+/*
+ * Allocate a color map of given size; initialize with contents of
+ * ColorMap if that pointer is non-NULL.
+ */
+ColorMapObject *
+GifMakeMapObject(int ColorCount, const GifColorType *ColorMap)
+{
+ ColorMapObject *Object;
+
+ /*** FIXME: Our ColorCount has to be a power of two. Is it necessary to
+ * make the user know that or should we automatically round up instead? */
+ if (ColorCount != (1 << GifBitSize(ColorCount))) {
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object = (ColorMapObject *)malloc(sizeof(ColorMapObject));
+ if (Object == (ColorMapObject *) NULL) {
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object->Colors = (GifColorType *)calloc(ColorCount, sizeof(GifColorType));
+ if (Object->Colors == (GifColorType *) NULL) {
+ free(Object);
+ return ((ColorMapObject *) NULL);
+ }
+
+ Object->ColorCount = ColorCount;
+ Object->BitsPerPixel = GifBitSize(ColorCount);
+
+ if (ColorMap != NULL) {
+ memcpy((char *)Object->Colors,
+ (char *)ColorMap, ColorCount * sizeof(GifColorType));
+ }
+
+ return (Object);
+}
+
+/*******************************************************************************
+Free a color map object
+*******************************************************************************/
+void
+GifFreeMapObject(ColorMapObject *Object)
+{
+ if (Object != NULL) {
+ (void)free(Object->Colors);
+ (void)free(Object);
+ }
+}
+
+#ifdef DEBUG
+void
+DumpColorMap(ColorMapObject *Object,
+ FILE * fp)
+{
+ if (Object != NULL) {
+ int i, j, Len = Object->ColorCount;
+
+ for (i = 0; i < Len; i += 4) {
+ for (j = 0; j < 4 && j < Len; j++) {
+ (void)fprintf(fp, "%3d: %02x %02x %02x ", i + j,
+ Object->Colors[i + j].Red,
+ Object->Colors[i + j].Green,
+ Object->Colors[i + j].Blue);
+ }
+ (void)fprintf(fp, "\n");
+ }
+ }
+}
+#endif /* DEBUG */
+
+/*******************************************************************************
+ Compute the union of two given color maps and return it. If result can't
+ fit into 256 colors, NULL is returned, the allocated union otherwise.
+ ColorIn1 is copied as is to ColorUnion, while colors from ColorIn2 are
+ copied iff they didn't exist before. ColorTransIn2 maps the old
+ ColorIn2 into the ColorUnion color map table./
+*******************************************************************************/
+ColorMapObject *
+GifUnionColorMap(const ColorMapObject *ColorIn1,
+ const ColorMapObject *ColorIn2,
+ GifPixelType ColorTransIn2[])
+{
+ int i, j, CrntSlot, RoundUpTo, NewGifBitSize;
+ ColorMapObject *ColorUnion;
+
+ /*
+ * We don't worry about duplicates within either color map; if
+ * the caller wants to resolve those, he can perform unions
+ * with an empty color map.
+ */
+
+ /* Allocate table which will hold the result for sure. */
+ ColorUnion = GifMakeMapObject(MAX(ColorIn1->ColorCount,
+ ColorIn2->ColorCount) * 2, NULL);
+
+ if (ColorUnion == NULL)
+ return (NULL);
+
+ /*
+ * Copy ColorIn1 to ColorUnion.
+ */
+ for (i = 0; i < ColorIn1->ColorCount; i++)
+ ColorUnion->Colors[i] = ColorIn1->Colors[i];
+ CrntSlot = ColorIn1->ColorCount;
+
+ /*
+ * Potentially obnoxious hack:
+ *
+ * Back CrntSlot down past all contiguous {0, 0, 0} slots at the end
+ * of table 1. This is very useful if your display is limited to
+ * 16 colors.
+ */
+ while (ColorIn1->Colors[CrntSlot - 1].Red == 0
+ && ColorIn1->Colors[CrntSlot - 1].Green == 0
+ && ColorIn1->Colors[CrntSlot - 1].Blue == 0)
+ CrntSlot--;
+
+ /* Copy ColorIn2 to ColorUnion (use old colors if they exist): */
+ for (i = 0; i < ColorIn2->ColorCount && CrntSlot <= 256; i++) {
+ /* Let's see if this color already exists: */
+ for (j = 0; j < ColorIn1->ColorCount; j++)
+ if (memcmp (&ColorIn1->Colors[j], &ColorIn2->Colors[i],
+ sizeof(GifColorType)) == 0)
+ break;
+
+ if (j < ColorIn1->ColorCount)
+ ColorTransIn2[i] = j; /* color exists in Color1 */
+ else {
+ /* Color is new - copy it to a new slot: */
+ ColorUnion->Colors[CrntSlot] = ColorIn2->Colors[i];
+ ColorTransIn2[i] = CrntSlot++;
+ }
+ }
+
+ if (CrntSlot > 256) {
+ GifFreeMapObject(ColorUnion);
+ return ((ColorMapObject *) NULL);
+ }
+
+ NewGifBitSize = GifBitSize(CrntSlot);
+ RoundUpTo = (1 << NewGifBitSize);
+
+ if (RoundUpTo != ColorUnion->ColorCount) {
+ register GifColorType *Map = ColorUnion->Colors;
+
+ /*
+ * Zero out slots up to next power of 2.
+ * We know these slots exist because of the way ColorUnion's
+ * start dimension was computed.
+ */
+ for (j = CrntSlot; j < RoundUpTo; j++)
+ Map[j].Red = Map[j].Green = Map[j].Blue = 0;
+
+ /* perhaps we can shrink the map? */
+ if (RoundUpTo < ColorUnion->ColorCount)
+ ColorUnion->Colors = (GifColorType *)realloc(Map,
+ sizeof(GifColorType) * RoundUpTo);
+ }
+
+ ColorUnion->ColorCount = RoundUpTo;
+ ColorUnion->BitsPerPixel = NewGifBitSize;
+
+ return (ColorUnion);
+}
+
+/*******************************************************************************
+ Apply a given color translation to the raster bits of an image
+*******************************************************************************/
+void
+GifApplyTranslation(SavedImage *Image, GifPixelType Translation[])
+{
+ register int i;
+ register int RasterSize = Image->ImageDesc.Height * Image->ImageDesc.Width;
+
+ for (i = 0; i < RasterSize; i++)
+ Image->RasterBits[i] = Translation[Image->RasterBits[i]];
+}
+
+/******************************************************************************
+ Extension record functions
+******************************************************************************/
+int
+GifAddExtensionBlock(int *ExtensionBlockCount,
+ ExtensionBlock **ExtensionBlocks,
+ int Function,
+ unsigned int Len,
+ unsigned char ExtData[])
+{
+ ExtensionBlock *ep;
+
+ if (*ExtensionBlocks == NULL)
+ *ExtensionBlocks=(ExtensionBlock *)malloc(sizeof(ExtensionBlock));
+ else
+ *ExtensionBlocks = (ExtensionBlock *)realloc(*ExtensionBlocks,
+ sizeof(ExtensionBlock) *
+ (*ExtensionBlockCount + 1));
+
+ if (*ExtensionBlocks == NULL)
+ return (GIF_ERROR);
+
+ ep = &(*ExtensionBlocks)[(*ExtensionBlockCount)++];
+
+ ep->Function = Function;
+ ep->ByteCount=Len;
+ ep->Bytes = (GifByteType *)malloc(ep->ByteCount);
+ if (ep->Bytes == NULL)
+ return (GIF_ERROR);
+
+ if (ExtData != NULL) {
+ memcpy(ep->Bytes, ExtData, Len);
+ }
+
+ return (GIF_OK);
+}
+
+void
+GifFreeExtensions(int *ExtensionBlockCount,
+ ExtensionBlock **ExtensionBlocks)
+{
+ ExtensionBlock *ep;
+
+ if (*ExtensionBlocks == NULL)
+ return;
+
+ for (ep = *ExtensionBlocks;
+ ep < (*ExtensionBlocks + *ExtensionBlockCount);
+ ep++)
+ (void)free((char *)ep->Bytes);
+ (void)free((char *)*ExtensionBlocks);
+ *ExtensionBlocks = NULL;
+ *ExtensionBlockCount = 0;
+}
+
+/******************************************************************************
+ Image block allocation functions
+******************************************************************************/
+
+/* Private Function:
+ * Frees the last image in the GifFile->SavedImages array
+ */
+void
+FreeLastSavedImage(GifFileType *GifFile)
+{
+ SavedImage *sp;
+
+ if ((GifFile == NULL) || (GifFile->SavedImages == NULL))
+ return;
+
+ /* Remove one SavedImage from the GifFile */
+ GifFile->ImageCount--;
+ sp = &GifFile->SavedImages[GifFile->ImageCount];
+
+ /* Deallocate its Colormap */
+ if (sp->ImageDesc.ColorMap != NULL) {
+ GifFreeMapObject(sp->ImageDesc.ColorMap);
+ sp->ImageDesc.ColorMap = NULL;
+ }
+
+ /* Deallocate the image data */
+ if (sp->RasterBits != NULL)
+ free((char *)sp->RasterBits);
+
+ /* Deallocate any extensions */
+ GifFreeExtensions(&sp->ExtensionBlockCount, &sp->ExtensionBlocks);
+
+ /*** FIXME: We could realloc the GifFile->SavedImages structure but is
+ * there a point to it? Saves some memory but we'd have to do it every
+ * time. If this is used in GifFreeSavedImages then it would be inefficient
+ * (The whole array is going to be deallocated.) If we just use it when
+ * we want to free the last Image it's convenient to do it here.
+ */
+}
+
+/*
+ * Append an image block to the SavedImages array
+ */
+SavedImage *
+GifMakeSavedImage(GifFileType *GifFile, const SavedImage *CopyFrom)
+{
+ SavedImage *sp;
+
+ if (GifFile->SavedImages == NULL)
+ GifFile->SavedImages = (SavedImage *)malloc(sizeof(SavedImage));
+ else
+ GifFile->SavedImages = (SavedImage *)realloc(GifFile->SavedImages,
+ sizeof(SavedImage) * (GifFile->ImageCount + 1));
+
+ if (GifFile->SavedImages == NULL)
+ return ((SavedImage *)NULL);
+ else {
+ sp = &GifFile->SavedImages[GifFile->ImageCount++];
+ memset((char *)sp, '\0', sizeof(SavedImage));
+
+ if (CopyFrom != NULL) {
+ memcpy((char *)sp, CopyFrom, sizeof(SavedImage));
+
+ /*
+ * Make our own allocated copies of the heap fields in the
+ * copied record. This guards against potential aliasing
+ * problems.
+ */
+
+ /* first, the local color map */
+ if (sp->ImageDesc.ColorMap != NULL) {
+ sp->ImageDesc.ColorMap = GifMakeMapObject(
+ CopyFrom->ImageDesc.ColorMap->ColorCount,
+ CopyFrom->ImageDesc.ColorMap->Colors);
+ if (sp->ImageDesc.ColorMap == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ }
+
+ /* next, the raster */
+ sp->RasterBits = (unsigned char *)malloc(sizeof(GifPixelType) *
+ CopyFrom->ImageDesc.Height *
+ CopyFrom->ImageDesc.Width);
+ if (sp->RasterBits == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ memcpy(sp->RasterBits, CopyFrom->RasterBits,
+ sizeof(GifPixelType) * CopyFrom->ImageDesc.Height *
+ CopyFrom->ImageDesc.Width);
+
+ /* finally, the extension blocks */
+ if (sp->ExtensionBlocks != NULL) {
+ sp->ExtensionBlocks = (ExtensionBlock *)malloc(
+ sizeof(ExtensionBlock) *
+ CopyFrom->ExtensionBlockCount);
+ if (sp->ExtensionBlocks == NULL) {
+ FreeLastSavedImage(GifFile);
+ return (SavedImage *)(NULL);
+ }
+ memcpy(sp->ExtensionBlocks, CopyFrom->ExtensionBlocks,
+ sizeof(ExtensionBlock) * CopyFrom->ExtensionBlockCount);
+ }
+ }
+
+ return (sp);
+ }
+}
+
+void
+GifFreeSavedImages(GifFileType *GifFile)
+{
+ SavedImage *sp;
+
+ if ((GifFile == NULL) || (GifFile->SavedImages == NULL)) {
+ return;
+ }
+ for (sp = GifFile->SavedImages;
+ sp < GifFile->SavedImages + GifFile->ImageCount; sp++) {
+ if (sp->ImageDesc.ColorMap != NULL) {
+ GifFreeMapObject(sp->ImageDesc.ColorMap);
+ sp->ImageDesc.ColorMap = NULL;
+ }
+
+ if (sp->RasterBits != NULL)
+ free((char *)sp->RasterBits);
+
+ GifFreeExtensions(&sp->ExtensionBlockCount, &sp->ExtensionBlocks);
+ }
+ free((char *)GifFile->SavedImages);
+ GifFile->SavedImages = NULL;
+}
+
+/* end */
diff --git a/giflib/quantize.c b/giflib/quantize.c
new file mode 100644
index 0000000..fc31f36
--- /dev/null
+++ b/giflib/quantize.c
@@ -0,0 +1,309 @@
+/*****************************************************************************
+
+ quantize.c - quantize a high resolution image into lower one
+
+ Based on: "Color Image Quantization for frame buffer Display", by
+ Paul Heckbert SIGGRAPH 1982 page 297-307.
+
+ This doesn't really belong in the core library, was undocumented,
+ and was removed in 4.2. Then it turned out some client apps were
+ actually using it, so it was restored in 5.0.
+
+******************************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "gif_lib.h"
+#include "gif_lib_private.h"
+
+#define ABS(x) ((x) > 0 ? (x) : (-(x)))
+
+#define COLOR_ARRAY_SIZE 32768
+#define BITS_PER_PRIM_COLOR 5
+#define MAX_PRIM_COLOR 0x1f
+
+static int SortRGBAxis;
+
+typedef struct QuantizedColorType {
+ GifByteType RGB[3];
+ GifByteType NewColorIndex;
+ long Count;
+ struct QuantizedColorType *Pnext;
+} QuantizedColorType;
+
+typedef struct NewColorMapType {
+ GifByteType RGBMin[3], RGBWidth[3];
+ unsigned int NumEntries; /* # of QuantizedColorType in linked list below */
+ unsigned long Count; /* Total number of pixels in all the entries */
+ QuantizedColorType *QuantizedColors;
+} NewColorMapType;
+
+static int SubdivColorMap(NewColorMapType * NewColorSubdiv,
+ unsigned int ColorMapSize,
+ unsigned int *NewColorMapSize);
+static int SortCmpRtn(const void *Entry1, const void *Entry2);
+
+/******************************************************************************
+ Quantize high resolution image into lower one. Input image consists of a
+ 2D array for each of the RGB colors with size Width by Height. There is no
+ Color map for the input. Output is a quantized image with 2D array of
+ indexes into the output color map.
+ Note input image can be 24 bits at the most (8 for red/green/blue) and
+ the output has 256 colors at the most (256 entries in the color map.).
+ ColorMapSize specifies size of color map up to 256 and will be updated to
+ real size before returning.
+ Also non of the parameter are allocated by this routine.
+ This function returns GIF_OK if successful, GIF_ERROR otherwise.
+******************************************************************************/
+int
+GifQuantizeBuffer(unsigned int Width,
+ unsigned int Height,
+ int *ColorMapSize,
+ GifByteType * RedInput,
+ GifByteType * GreenInput,
+ GifByteType * BlueInput,
+ GifByteType * OutputBuffer,
+ GifColorType * OutputColorMap) {
+
+ unsigned int Index, NumOfEntries;
+ int i, j, MaxRGBError[3];
+ unsigned int NewColorMapSize;
+ long Red, Green, Blue;
+ NewColorMapType NewColorSubdiv[256];
+ QuantizedColorType *ColorArrayEntries, *QuantizedColor;
+
+ ColorArrayEntries = (QuantizedColorType *)malloc(
+ sizeof(QuantizedColorType) * COLOR_ARRAY_SIZE);
+ if (ColorArrayEntries == NULL) {
+ return GIF_ERROR;
+ }
+
+ for (i = 0; i < COLOR_ARRAY_SIZE; i++) {
+ ColorArrayEntries[i].RGB[0] = i >> (2 * BITS_PER_PRIM_COLOR);
+ ColorArrayEntries[i].RGB[1] = (i >> BITS_PER_PRIM_COLOR) &
+ MAX_PRIM_COLOR;
+ ColorArrayEntries[i].RGB[2] = i & MAX_PRIM_COLOR;
+ ColorArrayEntries[i].Count = 0;
+ }
+
+ /* Sample the colors and their distribution: */
+ for (i = 0; i < (int)(Width * Height); i++) {
+ Index = ((RedInput[i] >> (8 - BITS_PER_PRIM_COLOR)) <<
+ (2 * BITS_PER_PRIM_COLOR)) +
+ ((GreenInput[i] >> (8 - BITS_PER_PRIM_COLOR)) <<
+ BITS_PER_PRIM_COLOR) +
+ (BlueInput[i] >> (8 - BITS_PER_PRIM_COLOR));
+ ColorArrayEntries[Index].Count++;
+ }
+
+ /* Put all the colors in the first entry of the color map, and call the
+ * recursive subdivision process. */
+ for (i = 0; i < 256; i++) {
+ NewColorSubdiv[i].QuantizedColors = NULL;
+ NewColorSubdiv[i].Count = NewColorSubdiv[i].NumEntries = 0;
+ for (j = 0; j < 3; j++) {
+ NewColorSubdiv[i].RGBMin[j] = 0;
+ NewColorSubdiv[i].RGBWidth[j] = 255;
+ }
+ }
+
+ /* Find the non empty entries in the color table and chain them: */
+ for (i = 0; i < COLOR_ARRAY_SIZE; i++)
+ if (ColorArrayEntries[i].Count > 0)
+ break;
+ QuantizedColor = NewColorSubdiv[0].QuantizedColors = &ColorArrayEntries[i];
+ NumOfEntries = 1;
+ while (++i < COLOR_ARRAY_SIZE)
+ if (ColorArrayEntries[i].Count > 0) {
+ QuantizedColor->Pnext = &ColorArrayEntries[i];
+ QuantizedColor = &ColorArrayEntries[i];
+ NumOfEntries++;
+ }
+ QuantizedColor->Pnext = NULL;
+
+ NewColorSubdiv[0].NumEntries = NumOfEntries; /* Different sampled colors */
+ NewColorSubdiv[0].Count = ((long)Width) * Height; /* Pixels */
+ NewColorMapSize = 1;
+ if (SubdivColorMap(NewColorSubdiv, *ColorMapSize, &NewColorMapSize) !=
+ GIF_OK) {
+ free((char *)ColorArrayEntries);
+ return GIF_ERROR;
+ }
+ if (NewColorMapSize < *ColorMapSize) {
+ /* And clear rest of color map: */
+ for (i = NewColorMapSize; i < *ColorMapSize; i++)
+ OutputColorMap[i].Red = OutputColorMap[i].Green =
+ OutputColorMap[i].Blue = 0;
+ }
+
+ /* Average the colors in each entry to be the color to be used in the
+ * output color map, and plug it into the output color map itself. */
+ for (i = 0; i < NewColorMapSize; i++) {
+ if ((j = NewColorSubdiv[i].NumEntries) > 0) {
+ QuantizedColor = NewColorSubdiv[i].QuantizedColors;
+ Red = Green = Blue = 0;
+ while (QuantizedColor) {
+ QuantizedColor->NewColorIndex = i;
+ Red += QuantizedColor->RGB[0];
+ Green += QuantizedColor->RGB[1];
+ Blue += QuantizedColor->RGB[2];
+ QuantizedColor = QuantizedColor->Pnext;
+ }
+ OutputColorMap[i].Red = (Red << (8 - BITS_PER_PRIM_COLOR)) / j;
+ OutputColorMap[i].Green = (Green << (8 - BITS_PER_PRIM_COLOR)) / j;
+ OutputColorMap[i].Blue = (Blue << (8 - BITS_PER_PRIM_COLOR)) / j;
+ }
+ }
+
+ /* Finally scan the input buffer again and put the mapped index in the
+ * output buffer. */
+ MaxRGBError[0] = MaxRGBError[1] = MaxRGBError[2] = 0;
+ for (i = 0; i < (int)(Width * Height); i++) {
+ Index = ((RedInput[i] >> (8 - BITS_PER_PRIM_COLOR)) <<
+ (2 * BITS_PER_PRIM_COLOR)) +
+ ((GreenInput[i] >> (8 - BITS_PER_PRIM_COLOR)) <<
+ BITS_PER_PRIM_COLOR) +
+ (BlueInput[i] >> (8 - BITS_PER_PRIM_COLOR));
+ Index = ColorArrayEntries[Index].NewColorIndex;
+ OutputBuffer[i] = Index;
+ if (MaxRGBError[0] < ABS(OutputColorMap[Index].Red - RedInput[i]))
+ MaxRGBError[0] = ABS(OutputColorMap[Index].Red - RedInput[i]);
+ if (MaxRGBError[1] < ABS(OutputColorMap[Index].Green - GreenInput[i]))
+ MaxRGBError[1] = ABS(OutputColorMap[Index].Green - GreenInput[i]);
+ if (MaxRGBError[2] < ABS(OutputColorMap[Index].Blue - BlueInput[i]))
+ MaxRGBError[2] = ABS(OutputColorMap[Index].Blue - BlueInput[i]);
+ }
+
+#ifdef DEBUG
+ fprintf(stderr,
+ "Quantization L(0) errors: Red = %d, Green = %d, Blue = %d.\n",
+ MaxRGBError[0], MaxRGBError[1], MaxRGBError[2]);
+#endif /* DEBUG */
+
+ free((char *)ColorArrayEntries);
+
+ *ColorMapSize = NewColorMapSize;
+
+ return GIF_OK;
+}
+
+/******************************************************************************
+ Routine to subdivide the RGB space recursively using median cut in each
+ axes alternatingly until ColorMapSize different cubes exists.
+ The biggest cube in one dimension is subdivide unless it has only one entry.
+ Returns GIF_ERROR if failed, otherwise GIF_OK.
+*******************************************************************************/
+static int
+SubdivColorMap(NewColorMapType * NewColorSubdiv,
+ unsigned int ColorMapSize,
+ unsigned int *NewColorMapSize) {
+
+ int MaxSize;
+ unsigned int i, j, Index = 0, NumEntries, MinColor, MaxColor;
+ long Sum, Count;
+ QuantizedColorType *QuantizedColor, **SortArray;
+
+ while (ColorMapSize > *NewColorMapSize) {
+ /* Find candidate for subdivision: */
+ MaxSize = -1;
+ for (i = 0; i < *NewColorMapSize; i++) {
+ for (j = 0; j < 3; j++) {
+ if ((((int)NewColorSubdiv[i].RGBWidth[j]) > MaxSize) &&
+ (NewColorSubdiv[i].NumEntries > 1)) {
+ MaxSize = NewColorSubdiv[i].RGBWidth[j];
+ Index = i;
+ SortRGBAxis = j;
+ }
+ }
+ }
+
+ if (MaxSize == -1)
+ return GIF_OK;
+
+ /* Split the entry Index into two along the axis SortRGBAxis: */
+
+ /* Sort all elements in that entry along the given axis and split at
+ * the median. */
+ SortArray = (QuantizedColorType **)malloc(
+ sizeof(QuantizedColorType *) *
+ NewColorSubdiv[Index].NumEntries);
+ if (SortArray == NULL)
+ return GIF_ERROR;
+ for (j = 0, QuantizedColor = NewColorSubdiv[Index].QuantizedColors;
+ j < NewColorSubdiv[Index].NumEntries && QuantizedColor != NULL;
+ j++, QuantizedColor = QuantizedColor->Pnext)
+ SortArray[j] = QuantizedColor;
+
+ qsort(SortArray, NewColorSubdiv[Index].NumEntries,
+ sizeof(QuantizedColorType *), SortCmpRtn);
+
+ /* Relink the sorted list into one: */
+ for (j = 0; j < NewColorSubdiv[Index].NumEntries - 1; j++)
+ SortArray[j]->Pnext = SortArray[j + 1];
+ SortArray[NewColorSubdiv[Index].NumEntries - 1]->Pnext = NULL;
+ NewColorSubdiv[Index].QuantizedColors = QuantizedColor = SortArray[0];
+ free((char *)SortArray);
+
+ /* Now simply add the Counts until we have half of the Count: */
+ Sum = NewColorSubdiv[Index].Count / 2 - QuantizedColor->Count;
+ NumEntries = 1;
+ Count = QuantizedColor->Count;
+ while (QuantizedColor->Pnext != NULL &&
+ (Sum -= QuantizedColor->Pnext->Count) >= 0 &&
+ QuantizedColor->Pnext->Pnext != NULL) {
+ QuantizedColor = QuantizedColor->Pnext;
+ NumEntries++;
+ Count += QuantizedColor->Count;
+ }
+ /* Save the values of the last color of the first half, and first
+ * of the second half so we can update the Bounding Boxes later.
+ * Also as the colors are quantized and the BBoxes are full 0..255,
+ * they need to be rescaled.
+ */
+ MaxColor = QuantizedColor->RGB[SortRGBAxis]; /* Max. of first half */
+ /* coverity[var_deref_op] */
+ MinColor = QuantizedColor->Pnext->RGB[SortRGBAxis]; /* of second */
+ MaxColor <<= (8 - BITS_PER_PRIM_COLOR);
+ MinColor <<= (8 - BITS_PER_PRIM_COLOR);
+
+ /* Partition right here: */
+ NewColorSubdiv[*NewColorMapSize].QuantizedColors =
+ QuantizedColor->Pnext;
+ QuantizedColor->Pnext = NULL;
+ NewColorSubdiv[*NewColorMapSize].Count = Count;
+ NewColorSubdiv[Index].Count -= Count;
+ NewColorSubdiv[*NewColorMapSize].NumEntries =
+ NewColorSubdiv[Index].NumEntries - NumEntries;
+ NewColorSubdiv[Index].NumEntries = NumEntries;
+ for (j = 0; j < 3; j++) {
+ NewColorSubdiv[*NewColorMapSize].RGBMin[j] =
+ NewColorSubdiv[Index].RGBMin[j];
+ NewColorSubdiv[*NewColorMapSize].RGBWidth[j] =
+ NewColorSubdiv[Index].RGBWidth[j];
+ }
+ NewColorSubdiv[*NewColorMapSize].RGBWidth[SortRGBAxis] =
+ NewColorSubdiv[*NewColorMapSize].RGBMin[SortRGBAxis] +
+ NewColorSubdiv[*NewColorMapSize].RGBWidth[SortRGBAxis] - MinColor;
+ NewColorSubdiv[*NewColorMapSize].RGBMin[SortRGBAxis] = MinColor;
+
+ NewColorSubdiv[Index].RGBWidth[SortRGBAxis] =
+ MaxColor - NewColorSubdiv[Index].RGBMin[SortRGBAxis];
+
+ (*NewColorMapSize)++;
+ }
+
+ return GIF_OK;
+}
+
+/****************************************************************************
+ Routine called by qsort to compare two entries.
+*****************************************************************************/
+static int
+SortCmpRtn(const void *Entry1,
+ const void *Entry2) {
+
+ return (*((QuantizedColorType **) Entry1))->RGB[SortRGBAxis] -
+ (*((QuantizedColorType **) Entry2))->RGB[SortRGBAxis];
+}
+
+/* end */
