| /* exif-mnote-data-canon.c |
| * |
| * Copyright (c) 2002, 2003 Lutz Mueller <lutz@users.sourceforge.net> |
| * Copyright (c) 2003 Matthieu Castet <mat-c@users.sourceforge.net> |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the |
| * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301 USA. |
| */ |
| |
| #include <config.h> |
| #include "exif-mnote-data-canon.h" |
| |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <libexif/exif-byte-order.h> |
| #include <libexif/exif-utils.h> |
| #include <libexif/exif-data.h> |
| |
| #define DEBUG |
| |
| static void |
| exif_mnote_data_canon_clear (ExifMnoteDataCanon *n) |
| { |
| ExifMnoteData *d = (ExifMnoteData *) n; |
| unsigned int i; |
| |
| if (!n) return; |
| |
| if (n->entries) { |
| for (i = 0; i < n->count; i++) |
| if (n->entries[i].data) { |
| exif_mem_free (d->mem, n->entries[i].data); |
| n->entries[i].data = NULL; |
| } |
| exif_mem_free (d->mem, n->entries); |
| n->entries = NULL; |
| n->count = 0; |
| } |
| } |
| |
| static void |
| exif_mnote_data_canon_free (ExifMnoteData *n) |
| { |
| if (!n) return; |
| |
| exif_mnote_data_canon_clear ((ExifMnoteDataCanon *) n); |
| } |
| |
| static void |
| exif_mnote_data_canon_get_tags (ExifMnoteDataCanon *dc, unsigned int n, |
| unsigned int *m, unsigned int *s) |
| { |
| unsigned int from = 0, to; |
| |
| if (!dc || !m) return; |
| for (*m = 0; *m < dc->count; (*m)++) { |
| to = from + mnote_canon_entry_count_values (&dc->entries[*m]); |
| if (to > n) { |
| if (s) *s = n - from; |
| break; |
| } |
| from = to; |
| } |
| } |
| |
| static char * |
| exif_mnote_data_canon_get_value (ExifMnoteData *note, unsigned int n, char *val, unsigned int maxlen) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| unsigned int m, s; |
| |
| if (!dc) return NULL; |
| exif_mnote_data_canon_get_tags (dc, n, &m, &s); |
| if (m >= dc->count) return NULL; |
| return mnote_canon_entry_get_value (&dc->entries[m], s, val, maxlen); |
| } |
| |
| static void |
| exif_mnote_data_canon_set_byte_order (ExifMnoteData *d, ExifByteOrder o) |
| { |
| ExifByteOrder o_orig; |
| ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) d; |
| unsigned int i; |
| |
| if (!n) return; |
| |
| o_orig = n->order; |
| n->order = o; |
| for (i = 0; i < n->count; i++) { |
| n->entries[i].order = o; |
| exif_array_set_byte_order (n->entries[i].format, n->entries[i].data, |
| n->entries[i].components, o_orig, o); |
| } |
| } |
| |
| static void |
| exif_mnote_data_canon_set_offset (ExifMnoteData *n, unsigned int o) |
| { |
| if (n) ((ExifMnoteDataCanon *) n)->offset = o; |
| } |
| |
| static void |
| exif_mnote_data_canon_save (ExifMnoteData *ne, |
| unsigned char **buf, unsigned int *buf_size) |
| { |
| ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne; |
| size_t i, o, s, doff; |
| unsigned char *t; |
| size_t ts; |
| |
| if (!n || !buf || !buf_size) return; |
| |
| /* |
| * Allocate enough memory for all entries and the number |
| * of entries. |
| */ |
| *buf_size = 2 + n->count * 12 + 4; |
| *buf = exif_mem_alloc (ne->mem, sizeof (char) * *buf_size); |
| if (!*buf) { |
| EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", *buf_size); |
| return; |
| } |
| |
| /* Save the number of entries */ |
| exif_set_short (*buf, n->order, (ExifShort) n->count); |
| |
| /* Save each entry */ |
| for (i = 0; i < n->count; i++) { |
| o = 2 + i * 12; |
| exif_set_short (*buf + o + 0, n->order, (ExifShort) n->entries[i].tag); |
| exif_set_short (*buf + o + 2, n->order, (ExifShort) n->entries[i].format); |
| exif_set_long (*buf + o + 4, n->order, |
| n->entries[i].components); |
| o += 8; |
| s = exif_format_get_size (n->entries[i].format) * |
| n->entries[i].components; |
| if (s > 65536) { |
| /* Corrupt data: EXIF data size is limited to the |
| * maximum size of a JPEG segment (64 kb). |
| */ |
| continue; |
| } |
| if (s > 4) { |
| ts = *buf_size + s; |
| |
| /* Ensure even offsets. Set padding bytes to 0. */ |
| if (s & 1) ts += 1; |
| t = exif_mem_realloc (ne->mem, *buf, |
| sizeof (char) * ts); |
| if (!t) { |
| EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", ts); |
| return; |
| } |
| *buf = t; |
| *buf_size = ts; |
| doff = *buf_size - s; |
| if (s & 1) { doff--; *(*buf + *buf_size - 1) = '\0'; } |
| exif_set_long (*buf + o, n->order, n->offset + doff); |
| } else |
| doff = o; |
| |
| /* |
| * Write the data. Fill unneeded bytes with 0. Do not |
| * crash if data is NULL. |
| */ |
| if (!n->entries[i].data) memset (*buf + doff, 0, s); |
| else memcpy (*buf + doff, n->entries[i].data, s); |
| if (s < 4) memset (*buf + doff + s, 0, (4 - s)); |
| } |
| } |
| |
| /* XXX |
| * FIXME: exif_mnote_data_canon_load() may fail and there is no |
| * semantics to express that. |
| * See bug #1054323 for details, especially the comment by liblit |
| * after it has supposedly been fixed: |
| * |
| * https://sourceforge.net/tracker/?func=detail&aid=1054323&group_id=12272&atid=112272 |
| * Unfortunately, the "return" statements aren't commented at |
| * all, so it isn't trivial to find out what is a normal |
| * return, and what is a reaction to an error condition. |
| */ |
| |
| static void |
| exif_mnote_data_canon_load (ExifMnoteData *ne, |
| const unsigned char *buf, unsigned int buf_size) |
| { |
| ExifMnoteDataCanon *n = (ExifMnoteDataCanon *) ne; |
| ExifShort c; |
| size_t i, tcount, o, datao; |
| |
| if (!n || !buf || !buf_size) { |
| exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| "ExifMnoteCanon", "Short MakerNote"); |
| return; |
| } |
| datao = 6 + n->offset; |
| if ((datao + 2 < datao) || (datao + 2 < 2) || (datao + 2 > buf_size)) { |
| exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| "ExifMnoteCanon", "Short MakerNote"); |
| return; |
| } |
| |
| /* Read the number of tags */ |
| c = exif_get_short (buf + datao, n->order); |
| datao += 2; |
| |
| /* Remove any old entries */ |
| exif_mnote_data_canon_clear (n); |
| |
| /* Reserve enough space for all the possible MakerNote tags */ |
| n->entries = exif_mem_alloc (ne->mem, sizeof (MnoteCanonEntry) * c); |
| if (!n->entries) { |
| EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", sizeof (MnoteCanonEntry) * c); |
| return; |
| } |
| |
| /* Parse the entries */ |
| tcount = 0; |
| for (i = c, o = datao; i; --i, o += 12) { |
| size_t s; |
| if ((o + 12 < o) || (o + 12 < 12) || (o + 12 > buf_size)) { |
| exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| "ExifMnoteCanon", "Short MakerNote"); |
| break; |
| } |
| |
| n->entries[tcount].tag = exif_get_short (buf + o, n->order); |
| n->entries[tcount].format = exif_get_short (buf + o + 2, n->order); |
| n->entries[tcount].components = exif_get_long (buf + o + 4, n->order); |
| n->entries[tcount].order = n->order; |
| |
| exif_log (ne->log, EXIF_LOG_CODE_DEBUG, "ExifMnoteCanon", |
| "Loading entry 0x%x ('%s')...", n->entries[tcount].tag, |
| mnote_canon_tag_get_name (n->entries[tcount].tag)); |
| |
| /* |
| * Size? If bigger than 4 bytes, the actual data is not |
| * in the entry but somewhere else (offset). |
| */ |
| s = exif_format_get_size (n->entries[tcount].format) * |
| n->entries[tcount].components; |
| n->entries[tcount].size = s; |
| if (!s) { |
| exif_log (ne->log, EXIF_LOG_CODE_CORRUPT_DATA, |
| "ExifMnoteCanon", |
| "Invalid zero-length tag size"); |
| continue; |
| |
| } else { |
| size_t dataofs = o + 8; |
| if (s > 4) dataofs = exif_get_long (buf + dataofs, n->order) + 6; |
| if ((dataofs + s < s) || (dataofs + s < dataofs) || (dataofs + s > buf_size)) { |
| exif_log (ne->log, EXIF_LOG_CODE_DEBUG, |
| "ExifMnoteCanon", |
| "Tag data past end of buffer (%zu > %u)", |
| dataofs + s, buf_size); |
| continue; |
| } |
| |
| n->entries[tcount].data = exif_mem_alloc (ne->mem, s); |
| if (!n->entries[tcount].data) { |
| EXIF_LOG_NO_MEMORY(ne->log, "ExifMnoteCanon", s); |
| continue; |
| } |
| memcpy (n->entries[tcount].data, buf + dataofs, s); |
| } |
| |
| /* Tag was successfully parsed */ |
| ++tcount; |
| } |
| /* Store the count of successfully parsed tags */ |
| n->count = tcount; |
| } |
| |
| static unsigned int |
| exif_mnote_data_canon_count (ExifMnoteData *n) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) n; |
| unsigned int i, c; |
| |
| for (i = c = 0; dc && (i < dc->count); i++) |
| c += mnote_canon_entry_count_values (&dc->entries[i]); |
| return c; |
| } |
| |
| static unsigned int |
| exif_mnote_data_canon_get_id (ExifMnoteData *d, unsigned int i) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) d; |
| unsigned int m; |
| |
| if (!dc) return 0; |
| exif_mnote_data_canon_get_tags (dc, i, &m, NULL); |
| if (m >= dc->count) return 0; |
| return dc->entries[m].tag; |
| } |
| |
| static const char * |
| exif_mnote_data_canon_get_name (ExifMnoteData *note, unsigned int i) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| unsigned int m, s; |
| |
| if (!dc) return NULL; |
| exif_mnote_data_canon_get_tags (dc, i, &m, &s); |
| if (m >= dc->count) return NULL; |
| return mnote_canon_tag_get_name_sub (dc->entries[m].tag, s, dc->options); |
| } |
| |
| static const char * |
| exif_mnote_data_canon_get_title (ExifMnoteData *note, unsigned int i) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| unsigned int m, s; |
| |
| if (!dc) return NULL; |
| exif_mnote_data_canon_get_tags (dc, i, &m, &s); |
| if (m >= dc->count) return NULL; |
| return mnote_canon_tag_get_title_sub (dc->entries[m].tag, s, dc->options); |
| } |
| |
| static const char * |
| exif_mnote_data_canon_get_description (ExifMnoteData *note, unsigned int i) |
| { |
| ExifMnoteDataCanon *dc = (ExifMnoteDataCanon *) note; |
| unsigned int m; |
| |
| if (!dc) return NULL; |
| exif_mnote_data_canon_get_tags (dc, i, &m, NULL); |
| if (m >= dc->count) return NULL; |
| return mnote_canon_tag_get_description (dc->entries[m].tag); |
| } |
| |
| int |
| exif_mnote_data_canon_identify (const ExifData *ed, const ExifEntry *e) |
| { |
| char value[8]; |
| ExifEntry *em = exif_data_get_entry (ed, EXIF_TAG_MAKE); |
| if (!em) |
| return 0; |
| return !strcmp (exif_entry_get_value (em, value, sizeof (value)), "Canon"); |
| } |
| |
| ExifMnoteData * |
| exif_mnote_data_canon_new (ExifMem *mem, ExifDataOption o) |
| { |
| ExifMnoteData *d; |
| ExifMnoteDataCanon *dc; |
| |
| if (!mem) return NULL; |
| |
| d = exif_mem_alloc (mem, sizeof (ExifMnoteDataCanon)); |
| if (!d) |
| return NULL; |
| |
| exif_mnote_data_construct (d, mem); |
| |
| /* Set up function pointers */ |
| d->methods.free = exif_mnote_data_canon_free; |
| d->methods.set_byte_order = exif_mnote_data_canon_set_byte_order; |
| d->methods.set_offset = exif_mnote_data_canon_set_offset; |
| d->methods.load = exif_mnote_data_canon_load; |
| d->methods.save = exif_mnote_data_canon_save; |
| d->methods.count = exif_mnote_data_canon_count; |
| d->methods.get_id = exif_mnote_data_canon_get_id; |
| d->methods.get_name = exif_mnote_data_canon_get_name; |
| d->methods.get_title = exif_mnote_data_canon_get_title; |
| d->methods.get_description = exif_mnote_data_canon_get_description; |
| d->methods.get_value = exif_mnote_data_canon_get_value; |
| |
| dc = (ExifMnoteDataCanon*)d; |
| dc->options = o; |
| return d; |
| } |