| /* Conversion module for ISO-2022-CN. |
| Copyright (C) 1999, 2000-2002, 2007, 2008 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@cygnus.com>, 1999. |
| |
| The GNU C 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 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C 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 the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <dlfcn.h> |
| #include <gconv.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include "gb2312.h" |
| #include "cns11643l1.h" |
| #include "cns11643l2.h" |
| |
| #include <assert.h> |
| |
| /* This makes obvious what everybody knows: 0x1b is the Esc character. */ |
| #define ESC 0x1b |
| |
| /* We have single-byte shift-in and shift-out sequences, and the single |
| shift sequence SS2 which replaces the SS2 designation for the next |
| two bytes. */ |
| #define SI 0x0f |
| #define SO 0x0e |
| #define SS2_0 ESC |
| #define SS2_1 0x4e |
| |
| /* Definitions used in the body of the `gconv' function. */ |
| #define CHARSET_NAME "ISO-2022-CN//" |
| #define DEFINE_INIT 1 |
| #define DEFINE_FINI 1 |
| #define FROM_LOOP from_iso2022cn_loop |
| #define TO_LOOP to_iso2022cn_loop |
| #define FROM_LOOP_MIN_NEEDED_FROM 1 |
| #define FROM_LOOP_MAX_NEEDED_FROM 4 |
| #define FROM_LOOP_MIN_NEEDED_TO 4 |
| #define FROM_LOOP_MAX_NEEDED_TO 4 |
| #define TO_LOOP_MIN_NEEDED_FROM 4 |
| #define TO_LOOP_MAX_NEEDED_FROM 4 |
| #define TO_LOOP_MIN_NEEDED_TO 1 |
| #define TO_LOOP_MAX_NEEDED_TO 6 |
| #define PREPARE_LOOP \ |
| int save_set; \ |
| int *setp = &data->__statep->__count; |
| #define EXTRA_LOOP_ARGS , setp |
| |
| |
| /* The COUNT element of the state keeps track of the currently selected |
| character set. The possible values are: */ |
| enum |
| { |
| ASCII_set = 0, |
| GB2312_set = 8, |
| CNS11643_1_set = 16, |
| CNS11643_2_set = 24, |
| CURRENT_SEL_MASK = 24, |
| GB2312_ann = 32, |
| CNS11643_1_ann = 64, |
| CNS11643_2_ann = 128, |
| CURRENT_ANN_MASK = 224 |
| }; |
| |
| |
| /* Since this is a stateful encoding we have to provide code which resets |
| the output state to the initial state. This has to be done during the |
| flushing. */ |
| #define EMIT_SHIFT_TO_INIT \ |
| if (data->__statep->__count != ASCII_set) \ |
| { \ |
| if (FROM_DIRECTION) \ |
| /* It's easy, we don't have to emit anything, we just reset the \ |
| state for the input. */ \ |
| data->__statep->__count = ASCII_set; \ |
| else \ |
| { \ |
| /* We are not in the initial state. To switch back we have \ |
| to emit `SI'. */ \ |
| if (__builtin_expect (outbuf == outend, 0)) \ |
| /* We don't have enough room in the output buffer. */ \ |
| status = __GCONV_FULL_OUTPUT; \ |
| else \ |
| { \ |
| /* Write out the shift sequence. */ \ |
| *outbuf++ = SI; \ |
| data->__statep->__count = ASCII_set; \ |
| } \ |
| } \ |
| } |
| |
| |
| /* Since we might have to reset input pointer we must be able to save |
| and retore the state. */ |
| #define SAVE_RESET_STATE(Save) \ |
| if (Save) \ |
| save_set = *setp; \ |
| else \ |
| *setp = save_set |
| |
| |
| /* First define the conversion function from ISO-2022-CN to UCS4. */ |
| #define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM |
| #define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO |
| #define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_NEEDED_TO |
| #define LOOPFCT FROM_LOOP |
| #define BODY \ |
| { \ |
| uint32_t ch = *inptr; \ |
| \ |
| /* This is a 7bit character set, disallow all 8bit characters. */ \ |
| if (__builtin_expect (ch >= 0x7f, 0)) \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (1); \ |
| \ |
| /* Recognize escape sequences. */ \ |
| if (__builtin_expect (ch, 0) == ESC) \ |
| { \ |
| /* There are two kinds of escape sequences we have to handle: \ |
| - those announcing the use of GB and CNS characters on the \ |
| line; we can simply ignore them \ |
| - the initial byte of the SS2 sequence. \ |
| */ \ |
| if (__builtin_expect (inptr + 2 > inend, 0) \ |
| || (inptr[1] == '$' \ |
| && (__builtin_expect (inptr + 3 > inend, 0) \ |
| || (inptr[2] == ')' \ |
| && __builtin_expect (inptr + 4 > inend, 0)) \ |
| || (inptr[2] == '*' \ |
| && __builtin_expect (inptr + 4 > inend, 0)))) \ |
| || (inptr[1] == SS2_1 \ |
| && __builtin_expect (inptr + 4 > inend, 0))) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| if (inptr[1] == '$' \ |
| && ((inptr[2] == ')' && (inptr[3] == 'A' || inptr[3] == 'G')) \ |
| || (inptr[2] == '*' && inptr[3] == 'H'))) \ |
| { \ |
| /* OK, we accept those character sets. */ \ |
| if (inptr[3] == 'A') \ |
| ann = GB2312_ann; \ |
| else if (inptr[3] == 'G') \ |
| ann = CNS11643_1_ann; \ |
| inptr += 4; \ |
| continue; \ |
| } \ |
| } \ |
| else if (__builtin_expect (ch, 0) == SO) \ |
| { \ |
| /* Switch to use GB2312 or CNS 11643 plane 1, depending on which \ |
| S0 designation came last. The only problem is what to do with \ |
| faulty input files where no designator came. \ |
| XXX For now I'll default to use GB2312. If this is not the \ |
| best behaviour (e.g., we should flag an error) let me know. */ \ |
| ++inptr; \ |
| set = ann == CNS11643_1_ann ? CNS11643_1_set : GB2312_set; \ |
| continue; \ |
| } \ |
| else if (__builtin_expect (ch, 0) == SI) \ |
| { \ |
| /* Switch to use ASCII. */ \ |
| ++inptr; \ |
| set = ASCII_set; \ |
| continue; \ |
| } \ |
| \ |
| if (__builtin_expect (ch, 0) == ESC && inptr[1] == SS2_1) \ |
| { \ |
| /* This is a character from CNS 11643 plane 2. \ |
| XXX We could test here whether the use of this character \ |
| set was announced. */ \ |
| inptr += 2; \ |
| ch = cns11643l2_to_ucs4 (&inptr, 2, 0); \ |
| if (__builtin_expect (ch, 0) == __UNKNOWN_10646_CHAR) \ |
| { \ |
| inptr -= 2; \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (2); \ |
| } \ |
| } \ |
| else if (set == ASCII_set) \ |
| { \ |
| /* Almost done, just advance the input pointer. */ \ |
| ++inptr; \ |
| } \ |
| else \ |
| { \ |
| /* That's pretty easy, we have a dedicated functions for this. */ \ |
| if (set == GB2312_set) \ |
| ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0); \ |
| else \ |
| { \ |
| assert (set == CNS11643_1_set); \ |
| ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0); \ |
| } \ |
| \ |
| if (__builtin_expect (ch, 1) == 0) \ |
| { \ |
| result = __GCONV_INCOMPLETE_INPUT; \ |
| break; \ |
| } \ |
| else if (__builtin_expect (ch, 1) == __UNKNOWN_10646_CHAR) \ |
| { \ |
| STANDARD_FROM_LOOP_ERR_HANDLER (1); \ |
| } \ |
| } \ |
| \ |
| put32 (outptr, ch); \ |
| outptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS , int *setp |
| #define INIT_PARAMS int set = *setp & CURRENT_SEL_MASK; \ |
| int ann = *setp & CURRENT_ANN_MASK |
| #define UPDATE_PARAMS *setp = set | ann |
| #include <iconv/loop.c> |
| |
| |
| /* Next, define the other direction. */ |
| #define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM |
| #define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM |
| #define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO |
| #define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO |
| #define LOOPFCT TO_LOOP |
| #define BODY \ |
| { \ |
| uint32_t ch = get32 (inptr); \ |
| \ |
| /* First see whether we can write the character using the currently \ |
| selected character set. */ \ |
| if (ch < 0x80) \ |
| { \ |
| if (set != ASCII_set) \ |
| { \ |
| *outptr++ = SI; \ |
| set = ASCII_set; \ |
| if (__builtin_expect (outptr == outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| } \ |
| \ |
| *outptr++ = ch; \ |
| \ |
| /* At the end of the line we have to clear the `ann' flags since \ |
| every line must contain this information again. */ \ |
| if (ch == L'\n') \ |
| ann = 0; \ |
| } \ |
| else \ |
| { \ |
| unsigned char buf[2]; \ |
| /* Fake initialization to keep gcc quiet. */ \ |
| asm ("" : "=m" (buf)); \ |
| \ |
| int used; \ |
| size_t written = 0; \ |
| \ |
| if (set == GB2312_set || (ann & CNS11643_1_ann) == 0) \ |
| { \ |
| written = ucs4_to_gb2312 (ch, buf, 2); \ |
| used = GB2312_set; \ |
| } \ |
| else \ |
| { \ |
| written = ucs4_to_cns11643l1 (ch, buf, 2); \ |
| used = CNS11643_1_set; \ |
| } \ |
| \ |
| if (written == __UNKNOWN_10646_CHAR) \ |
| { \ |
| /* Cannot convert it using the currently selected SO set. \ |
| Next try the SS2 set. */ \ |
| written = ucs4_to_cns11643l2 (ch, buf, 2); \ |
| if (written != __UNKNOWN_10646_CHAR) \ |
| /* Yep, that worked. */ \ |
| used = CNS11643_2_set; \ |
| else \ |
| { \ |
| /* Well, see whether we have to change the SO set. */ \ |
| if (used == GB2312_set) \ |
| written = ucs4_to_cns11643l1 (ch, buf, 2); \ |
| else \ |
| written = ucs4_to_gb2312 (ch, buf, 2); \ |
| \ |
| if (__builtin_expect (written, 0) != __UNKNOWN_10646_CHAR) \ |
| /* Oh well, then switch SO. */ \ |
| used = GB2312_set + CNS11643_1_set - used; \ |
| else \ |
| { \ |
| UNICODE_TAG_HANDLER (ch, 4); \ |
| \ |
| /* Even this does not work. Error. */ \ |
| STANDARD_TO_LOOP_ERR_HANDLER (4); \ |
| } \ |
| } \ |
| } \ |
| assert (written == 2); \ |
| \ |
| /* See whether we have to emit an escape sequence. */ \ |
| if (set != used) \ |
| { \ |
| /* First see whether we announced that we use this \ |
| character set. */ \ |
| if ((ann & (16 << (used >> 3))) == 0) \ |
| { \ |
| const char *escseq; \ |
| \ |
| if (__builtin_expect (outptr + 4 > outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| assert ((used >> 3) >= 1 && (used >> 3) <= 3); \ |
| escseq = ")A)G*H" + ((used >> 3) - 1) * 2; \ |
| *outptr++ = ESC; \ |
| *outptr++ = '$'; \ |
| *outptr++ = *escseq++; \ |
| *outptr++ = *escseq++; \ |
| \ |
| if (used == GB2312_set) \ |
| ann = (ann & CNS11643_2_ann) | GB2312_ann; \ |
| else if (used == CNS11643_1_set) \ |
| ann = (ann & CNS11643_2_ann) | CNS11643_1_ann; \ |
| else \ |
| ann |= CNS11643_2_ann; \ |
| } \ |
| \ |
| if (used == CNS11643_2_set) \ |
| { \ |
| if (__builtin_expect (outptr + 2 > outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = SS2_0; \ |
| *outptr++ = SS2_1; \ |
| } \ |
| else \ |
| { \ |
| /* We only have to emit something is currently ASCII is \ |
| selected. Otherwise we are switching within the \ |
| SO charset. */ \ |
| if (set == ASCII_set) \ |
| { \ |
| if (__builtin_expect (outptr + 1 > outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| *outptr++ = SO; \ |
| } \ |
| } \ |
| \ |
| /* Always test the length here since we have used up all the \ |
| guaranteed output buffer slots. */ \ |
| if (__builtin_expect (outptr + 2 > outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| } \ |
| else if (__builtin_expect (outptr + 2 > outend, 0)) \ |
| { \ |
| result = __GCONV_FULL_OUTPUT; \ |
| break; \ |
| } \ |
| \ |
| *outptr++ = buf[0]; \ |
| *outptr++ = buf[1]; \ |
| set = used; \ |
| } \ |
| \ |
| /* Now that we wrote the output increment the input pointer. */ \ |
| inptr += 4; \ |
| } |
| #define LOOP_NEED_FLAGS |
| #define EXTRA_LOOP_DECLS , int *setp |
| #define INIT_PARAMS int set = *setp & CURRENT_SEL_MASK; \ |
| int ann = *setp & CURRENT_ANN_MASK |
| #define REINIT_PARAMS do \ |
| { \ |
| set = *setp & CURRENT_SEL_MASK; \ |
| ann = *setp & CURRENT_ANN_MASK; \ |
| } \ |
| while (0) |
| #define UPDATE_PARAMS *setp = set | ann |
| #include <iconv/loop.c> |
| |
| |
| /* Now define the toplevel functions. */ |
| #include <iconv/skeleton.c> |
