/* Conversion module for ISO-2022-CN. Copyright (C) 1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 1999. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include "gb2312.h" #include "cns11643l1.h" #include "cns11643l2.h" #include /* 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 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 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 \ { \ unsigned char *outbuf = data->__outbuf; \ \ /* We are not in the initial state. To switch back we have \ to emit `SI'. */ \ if (outbuf == data->__outbufend) \ /* 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) \ *written += 1; \ data->__outbuf = outbuf; \ 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 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; \ ++*converted; \ continue; \ } \ \ /* Recognize escape sequences. */ \ if (ch == 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 (NEED_LENGTH_TEST \ && (inptr + 1 > inend \ || (inptr[1] == '$' \ && (inptr + 2 > inend \ || (inptr[2] == ')' && inptr + 3 > inend) \ || (inptr[2] == '*' && inptr + 3 > inend))) \ || (inptr[1] == SS2_1 && inptr + 3 > inend))) \ { \ result = __GCONV_EMPTY_INPUT; \ break; \ } \ if (inptr[1] == '$' \ && ((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 (ch == 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 (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. */ \ inptr += 2; \ ch = cns11643l2_to_ucs4 (&inptr, 2, 0); \ if (ch == __UNKNOWN_10646_CHAR) \ { \ if (! ignore_errors_p ()) \ { \ /* This is an illegal character. */ \ inptr -= 2; \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ \ ++*converted; \ continue; \ } \ } \ 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, \ NEED_LENGTH_TEST ? inend - inptr : 2, 0); \ else \ { \ assert (set == CNS11643_1_set); \ ch = cns11643l1_to_ucs4 (&inptr, \ NEED_LENGTH_TEST ? inend - inptr : 2, 0);\ } \ \ if (NEED_LENGTH_TEST && ch == 0) \ { \ result = __GCONV_EMPTY_INPUT; \ break; \ } \ else if (ch == __UNKNOWN_10646_CHAR) \ { \ if (! ignore_errors_p ()) \ { \ /* This is an illegal character. */ \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ \ ++inptr; \ ++*converted; \ continue; \ } \ } \ \ put32 (outptr, ch); \ outptr += 4; \ } #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 /* 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 = 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 (NEED_LENGTH_TEST && 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 & 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 (set == GB2312_set) \ written = ucs4_to_cns11643l1 (ch, buf, 2); \ else \ written = ucs4_to_gb2312 (ch, buf, 2); \ \ if (written != __UNKNOWN_10646_CHAR) \ /* Oh well, then switch SO. */ \ used = GB2312_set + CNS11643_1_set - set; \ else \ { \ /* Even this does not work. Error. */ \ if (! ignore_errors_p ()) \ { \ result = __GCONV_ILLEGAL_INPUT; \ break; \ } \ \ inptr += 4; \ ++*converted; \ continue; \ } \ } \ } \ 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 & (2 << used)) == 0) \ { \ const char *escseq; \ \ if (NEED_LENGTH_TEST && outptr + 4 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ \ assert (used >= 1 && used <= 3); \ escseq = "\e$)A\e$)G\e$*H" + (used - 1) * 4; \ *outptr++ = *escseq++; \ *outptr++ = *escseq++; \ *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 (outptr + 2 > outend) \ { \ 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 (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 (NEED_LENGTH_TEST && outptr + 2 > outend) \ { \ result = __GCONV_FULL_OUTPUT; \ break; \ } \ \ *outptr++ = buf[0]; \ *outptr++ = buf[1]; \ } \ \ /* Now that we wrote the output increment the input pointer. */ \ inptr += 4; \ } #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 /* Now define the toplevel functions. */ #include