/* Conversion module for ISO-2022-CN-EXT. Copyright (C) 2000, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000. 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 <stdlib.h> #include <string.h> #include "gb2312.h" #include "iso-ir-165.h" #include "cns11643.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 sequences SS2 and SS3 which replaces the SS2/SS3 designation for the next two bytes. */ #define SI 0x0f #define SO 0x0e #define SS2_0 ESC #define SS2_1 0x4e #define SS3_0 ESC #define SS3_1 0x4f /* Definitions used in the body of the `gconv' function. */ #define CHARSET_NAME "ISO-2022-CN-EXT//" #define DEFINE_INIT 1 #define DEFINE_FINI 1 #define FROM_LOOP from_iso2022cn_ext_loop #define TO_LOOP to_iso2022cn_ext_loop #define MIN_NEEDED_FROM 1 #define MAX_NEEDED_FROM 4 #define MIN_NEEDED_TO 4 #define MAX_NEEDED_TO 4 #define PREPARE_LOOP \ int save_set; \ int *setp = &data->__statep->__count; #define EXTRA_LOOP_ARGS , setp /* The charsets GB/T 12345-90, GB 7589-87, GB/T 13131-9X, GB 7590-87, and GB/T 13132-9X are not registered to the best of my knowledge and therefore have no escape sequence assigned. We cannot handle them for this reason. Tell the implementation about this. */ #define X12345 '\0' #define X7589 '\0' #define X13131 '\0' #define X7590 '\0' #define X13132 '\0' /* The COUNT element of the state keeps track of the currently selected character set. The possible values are: */ enum { ASCII_set = 0, GB2312_set, GB12345_set, CNS11643_1_set, ISO_IR_165_set, SO_mask = 7, GB7589_set = 1 << 3, GB13131_set = 2 << 3, CNS11643_2_set = 3 << 3, SS2_mask = 3 << 3, GB7590_set = 1 << 5, GB13132_set = 2 << 5, CNS11643_3_set = 3 << 5, CNS11643_4_set = 4 << 5, CNS11643_5_set = 5 << 5, CNS11643_6_set = 6 << 5, CNS11643_7_set = 7 << 5, SS3_mask = 7 << 5, #define CURRENT_MASK (SO_mask | SS2_mask | SS3_mask) GB2312_ann = 1 << 8, GB12345_ann = 2 << 8, CNS11643_1_ann = 3 << 8, ISO_IR_165_ann = 4 << 8, SO_ann = 7 << 8, GB7589_ann = 1 << 11, GB13131_ann = 2 << 11, CNS11643_2_ann = 3 << 11, SS2_ann = 3 << 11, GB7590_ann = 1 << 13, GB13132_ann = 2 << 13, CNS11643_3_ann = 3 << 13, CNS11643_4_ann = 4 << 13, CNS11643_5_ann = 5 << 13, CNS11643_6_ann = 6 << 13, CNS11643_7_ann = 7 << 13, SS3_ann = 7 << 13 }; /* 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 >> 3 != 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 << 3; \ 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; \ if (data->__flags & __GCONV_IS_LAST) \ *irreversible += 1; \ data->__statep->__count = ASCII_set << 3; \ } \ } \ } /* 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 MIN_NEEDED_FROM #define MAX_NEEDED_INPUT MAX_NEEDED_FROM #define MIN_NEEDED_OUTPUT MIN_NEEDED_TO #define LOOPFCT FROM_LOOP #define BODY \ { \ uint32_t ch = *inptr; \ \ /* This is a 7bit character set, disallow all 8bit characters. */ \ if (ch > 0x7f) \ { \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ ++inptr; \ ++*irreversible; \ continue; \ } \ \ /* Recognize escape sequences. */ \ if (ch == ESC) \ { \ /* There are three 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. \ - the initial byte of the SS3 sequence. \ */ \ if (inptr + 2 > inend \ || (inptr[1] == '$' \ && (inptr + 3 > inend \ || (inptr[2] == ')' && inptr + 4 > inend) \ || (inptr[2] == '*' && inptr + 4 > inend) \ || (inptr[2] == '+' && inptr + 4 > inend))) \ || (inptr[1] == SS2_1 && inptr + 4 > inend) \ || (inptr[1] == SS3_1 && inptr + 4 > inend)) \ { \ result = __GCONV_INCOMPLETE_INPUT; \ break; \ } \ if (inptr[1] == '$' \ && ((inptr[2] == ')' \ && (inptr[3] == 'A' \ || (X12345 != '\0' && inptr[3] == X12345) \ || inptr[3] == 'E' || inptr[3] == 'G')) \ || (inptr[2] == '*' \ && ((X7589 != '\0' && inptr[3] == X7589) \ || (X13131 != '\0' && inptr[3] == X13131) \ || inptr[3] == 'H')) \ || (inptr[2] == '+' \ && ((X7590 != '\0' && inptr[3] == X7590) \ || (X13132 != '\0' && inptr[3] == X13132) \ || inptr[3] == 'I' || inptr[3] == 'J' \ || inptr[3] == 'K' || inptr[3] == 'L' \ || inptr[3] == 'M')))) \ { \ /* OK, we accept those character sets. */ \ if (inptr[3] == 'A') \ ann = (ann & ~SO_ann) | GB2312_ann; \ else if (inptr[3] == 'G') \ ann = (ann & ~SO_ann) | CNS11643_1_ann; \ else if (inptr[3] == 'E') \ ann = (ann & ~SO_ann) | ISO_IR_165_ann; \ else if (X12345 != '\0' && inptr[3] == X12345) \ ann = (ann & ~SO_ann) | GB12345_ann; \ else if (inptr[3] == 'H') \ ann = (ann & ~SS2_ann) | CNS11643_2_ann; \ else if (X7589 != '\0' && inptr[3] == X7589) \ ann = (ann & ~SS2_ann) | GB7589_ann; \ else if (X13131 != '\0' && inptr[3] == X13131) \ ann = (ann & ~SS2_ann) | GB13131_ann; \ else if (inptr[3] == 'I') \ ann = (ann & ~SS3_ann) | CNS11643_3_ann; \ else if (inptr[3] == 'J') \ ann = (ann & ~SS3_ann) | CNS11643_4_ann; \ else if (inptr[3] == 'K') \ ann = (ann & ~SS3_ann) | CNS11643_5_ann; \ else if (inptr[3] == 'L') \ ann = (ann & ~SS3_ann) | CNS11643_6_ann; \ else if (inptr[3] == 'M') \ ann = (ann & ~SS3_ann) | CNS11643_7_ann; \ else if (X7590 != '\0' && inptr[3] == X7590) \ ann = (ann & ~SS3_ann) | GB7590_ann; \ else if (X13132 != '\0' && inptr[3] == X13132) \ ann = (ann & ~SS3_ann) | GB13132_ann; \ inptr += 4; \ continue; \ } \ } \ else if (ch == SO) \ { \ /* Switch to use GB2312, GB12345, CNS 11643 plane 1, or ISO-IR-165, \ 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 behavior (e.g., we should flag an error) let me know. */ \ ++inptr; \ if ((ann & SO_ann) != 0) \ switch (ann & SO_ann) \ { \ case GB2312_ann: \ set = GB2312_set; \ break; \ case GB12345_ann: \ set = GB12345_set; \ break; \ case CNS11643_1_ann: \ set = CNS11643_1_set; \ break; \ case ISO_IR_165_ann: \ set = ISO_IR_165_set; \ break; \ default: \ abort (); \ } \ else \ { \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ ++inptr; \ ++*irreversible; \ } \ continue; \ } \ else if (ch == SI) \ { \ /* Switch to use ASCII. */ \ ++inptr; \ set = ASCII_set; \ continue; \ } \ \ if (ch == 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. \ XXX Currently GB7589 and GB13131 are not supported. */ \ inptr += 2; \ ch = cns11643l2_to_ucs4 (&inptr, 2, 0); \ if (ch == __UNKNOWN_10646_CHAR) \ { \ if (! ignore_errors_p ()) \ { \ inptr -= 2; \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ inptr += 2; \ ++*irreversible; \ continue; \ } \ } \ /* Note that we can assume here that at least 4 bytes are available if \ the first byte is ESC since otherwise the first if would have been \ true. */ \ else if (ch == ESC && inptr[1] == SS3_1) \ { \ /* This is a character from CNS 11643 plane 3 or higher. \ XXX Currently GB7590 and GB13132 are not supported. */ \ char buf[3]; \ const char *tmp = buf; \ \ buf[1] = inptr[2]; \ buf[2] = inptr[3]; \ switch (ann & SS3_ann) \ { \ case CNS11643_3_ann: \ buf[0] = 0x23; \ ch = cns11643_to_ucs4 (&tmp, 3, 0); \ break; \ case CNS11643_4_ann: \ buf[0] = 0x24; \ ch = cns11643_to_ucs4 (&tmp, 3, 0); \ break; \ case CNS11643_5_ann: \ buf[0] = 0x25; \ ch = cns11643_to_ucs4 (&tmp, 3, 0); \ break; \ case CNS11643_6_ann: \ buf[0] = 0x26; \ ch = cns11643_to_ucs4 (&tmp, 3, 0); \ break; \ case CNS11643_7_ann: \ buf[0] = 0x27; \ ch = cns11643_to_ucs4 (&tmp, 3, 0); \ break; \ default: \ /* XXX Currently GB7590 and GB13132 are not supported. */ \ ch = __UNKNOWN_10646_CHAR; \ break; \ } \ if (ch == __UNKNOWN_10646_CHAR) \ { \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ inptr += 4; \ ++*irreversible; \ continue; \ } \ assert (tmp == buf + 3); \ inptr += 4; \ } \ 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 (inend - inptr < 2) \ { \ result = __GCONV_INCOMPLETE_INPUT; \ break; \ } \ if (set == GB2312_set) \ ch = gb2312_to_ucs4 (&inptr, inend - inptr, 0); \ else if (set == ISO_IR_165_set) \ ch = isoir165_to_ucs4 (&inptr, inend - inptr); \ else \ { \ assert (set == CNS11643_1_set); \ ch = cns11643l1_to_ucs4 (&inptr, inend - inptr, 0); \ } \ \ if (ch == 0) \ { \ result = __GCONV_INCOMPLETE_INPUT; \ break; \ } \ else if (ch == __UNKNOWN_10646_CHAR) \ { \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ inptr += 2; \ ++*irreversible; \ continue; \ } \ } \ \ *((uint32_t *) outptr)++ = ch; \ } #define EXTRA_LOOP_DECLS , int *setp #define INIT_PARAMS int set = (*setp >> 3) & CURRENT_MASK; \ int ann = (*setp >> 3) & ~CURRENT_MASK #define UPDATE_PARAMS *setp = (set | ann) << 3 #define LOOP_NEED_FLAGS #include <iconv/loop.c> /* Next, define the other direction. */ #define MIN_NEEDED_INPUT MIN_NEEDED_TO #define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM #define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM #define LOOPFCT TO_LOOP #define BODY \ { \ uint32_t ch; \ size_t written = 0; \ \ ch = *((const uint32_t *) 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 (outptr == outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ } \ \ *outptr++ = ch; \ written = 1; \ \ /* 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 \ { \ char buf[2]; \ int used; \ \ if (set == GB2312_set || ((ann & SO_ann) != CNS11643_1_ann \ && (ann & SO_ann) != ISO_IR_165_ann)) \ { \ written = ucs4_to_gb2312 (ch, buf, 2); \ used = GB2312_set; \ } \ else if (set == ISO_IR_165_set || (ann & SO_ann) == ISO_IR_165_set) \ { \ written = ucs4_to_isoir165 (ch, buf, 2); \ used = ISO_IR_165_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 \ { \ char tmpbuf[3]; \ \ switch (0) \ { \ default: \ /* Well, see whether we have to change the SO set. */ \ \ if (used != GB2312_set) \ { \ written = ucs4_to_gb2312 (ch, buf, 2); \ if (written != __UNKNOWN_10646_CHAR) \ { \ used = GB2312_set; \ break; \ } \ } \ \ if (used != ISO_IR_165_set) \ { \ written = ucs4_to_isoir165 (ch, buf, 2); \ if (written != __UNKNOWN_10646_CHAR) \ { \ used = ISO_IR_165_set; \ break; \ } \ } \ \ if (used != CNS11643_1_set) \ { \ written = ucs4_to_cns11643l1 (ch, buf, 2); \ if (written != __UNKNOWN_10646_CHAR) \ { \ used = CNS11643_1_set; \ break; \ } \ } \ \ written = ucs4_to_cns11643 (ch, tmpbuf, 3); \ if (written == 3 && tmpbuf[0] >= 3 && tmpbuf[0] <= 7) \ { \ buf[0] = tmpbuf[1]; \ buf[1] = tmpbuf[2]; \ switch (tmpbuf[0]) \ { \ case 3: \ used = CNS11643_3_set; \ break; \ case 4: \ used = CNS11643_4_set; \ break; \ case 5: \ used = CNS11643_5_set; \ break; \ case 6: \ used = CNS11643_6_set; \ break; \ case 7: \ used = CNS11643_7_set; \ break; \ default: \ abort (); \ } \ written = 2; \ break; \ } \ \ /* XXX Currently GB7590 and GB13132 are not supported. */\ \ /* Even this does not work. Error. */ \ used = ASCII_set; \ } \ if (used == ASCII_set) \ { \ UNICODE_TAG_HANDLER (ch, 4); \ STANDARD_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 ((used & SO_mask) != 0 && (ann & SO_ann) != (used << 8)) \ { \ const char *escseq; \ \ if (outptr + 4 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ \ assert (used >= 1 && used <= 4); \ escseq = ")A\0\0)G)E" + (used - 1) * 2; \ *outptr++ = ESC; \ *outptr++ = '$'; \ *outptr++ = *escseq++; \ *outptr++ = *escseq++; \ \ ann = (ann & ~SO_ann) | (used << 8); \ } \ else if ((used & SS2_mask) != 0 && (ann & SS2_ann) != (used << 8))\ { \ const char *escseq; \ \ assert (used == CNS11643_2_set); /* XXX */ \ escseq = "*H"; \ *outptr++ = ESC; \ *outptr++ = '$'; \ *outptr++ = *escseq++; \ *outptr++ = *escseq++; \ \ ann = (ann & ~SS2_ann) | (used << 8); \ } \ else if ((used & SS3_mask) != 0 && (ann & SS3_ann) != (used << 8))\ { \ const char *escseq; \ \ assert ((used >> 5) >= 3 && (used >> 5) <= 7); \ escseq = "+I+J+K+L+M" + ((used >> 5) - 3) * 2; \ *outptr++ = ESC; \ *outptr++ = '$'; \ *outptr++ = *escseq++; \ *outptr++ = *escseq++; \ \ ann = (ann & ~SS3_ann) | (used << 8); \ } \ \ if (used == CNS11643_2_set) \ { \ if (outptr + 2 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ *outptr++ = SS2_0; \ *outptr++ = SS2_1; \ } \ else if (used >= CNS11643_3_set && used <= CNS11643_7_set) \ { \ if (outptr + 2 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ *outptr++ = SS3_0; \ *outptr++ = SS3_1; \ } \ else \ { \ /* We only have to emit something if currently ASCII is \ selected. Otherwise we are switching within the \ SO charset. */ \ if (set == ASCII_set) \ { \ if (outptr + 1 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ *outptr++ = SO; \ } \ } \ \ /* Always test the length here since we have used up all the \ guaranteed output buffer slots. */ \ if (outptr + 2 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ } \ else if (outptr + 2 > outend) \ { \ 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 EXTRA_LOOP_DECLS , int *setp #define INIT_PARAMS int set = (*setp >> 3) & CURRENT_MASK; \ int ann = (*setp >> 3) & ~CURRENT_MASK #define UPDATE_PARAMS *setp = (set | ann) << 3 #define LOOP_NEED_FLAGS #include <iconv/loop.c> /* Now define the toplevel functions. */ #include <iconv/skeleton.c>