/* Conversion module for ISO-2022-KR. Copyright (C) 1998 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper , 1998. 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 "ksc5601.h" #include /* This makes obvious what everybody knows: 0x1b is the Esc character. */ #define ESC 0x1b /* The shift sequences for this charset (it does not use ESC). */ #define SI 0x0f #define SO 0x0e /* Definitions used in the body of the `gconv' function. */ #define CHARSET_NAME "ISO-2022-KR//" #define DEFINE_INIT 1 #define DEFINE_FINI 1 #define FROM_LOOP from_iso2022kr_loop #define TO_LOOP to_iso2022kr_loop #define MIN_NEEDED_FROM 1 #define MAX_NEEDED_FROM 3 #define MIN_NEEDED_TO 4 #define MAX_NEEDED_TO 4 #define PREPARE_LOOP \ int save_set; \ int *setp = &data->statep->count; \ if (!FROM_DIRECTION && !data->internal_use && data->invocation_counter == 0)\ { \ /* Emit the designator sequence. */ \ if (outbuf + 4 > outend) \ return GCONV_FULL_OUTPUT; \ \ *outbuf++ = ESC; \ *outbuf++ = '$'; \ *outbuf++ = ')'; \ *outbuf++ = 'C'; \ } #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, KSC5601_set }; /* 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 \ { \ 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; \ 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-KR 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) \ { \ result = GCONV_ILLEGAL_INPUT; \ break; \ } \ \ /* Recognize escape sequences. */ \ if (ch == ESC) \ { \ /* We don't really have to handle escape sequences since all the \ switching is done using the SI and SO bytes. But we have to \ recognize `Esc $ ) C' since this is a kind of flag for this \ encoding. We simply ignore it. */ \ if (inptr + 1 > inend \ || (inptr[1] == '$' \ && (inptr + 2 > inend \ || (inptr[2] == ')' && inptr + 3 > inend)))) \ \ { \ result = GCONV_EMPTY_INPUT; \ break; \ } \ if (inptr[1] == '$' && inptr[2] == ')' && inptr[3] == 'C') \ { \ /* Yeah, yeah, we know this is ISO 2022-KR. */ \ inptr += 4; \ continue; \ } \ } \ else if (ch == SO) \ { \ /* Switch to use KSC. */ \ ++inptr; \ set = KSC5601_set; \ continue; \ } \ else if (ch == SI) \ { \ /* Switch to use ASCII. */ \ ++inptr; \ set = ASCII_set; \ continue; \ } \ \ if (set == ASCII_set) \ { \ if (ch >= 0x80) \ { \ result = GCONV_ILLEGAL_INPUT; \ break; \ } \ /* Almost done, just advance the input pointer. */ \ ++inptr; \ } \ else \ { \ assert (set == KSC5601_set); \ \ /* Use the KSC 5601 table. */ \ ch = ksc5601_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) \ { \ result = GCONV_ILLEGAL_INPUT; \ break; \ } \ } \ \ *((uint32_t *) outptr)++ = ch; \ } #define EXTRA_LOOP_DECLS , int *setp #define INIT_PARAMS int set = *setp #define UPDATE_PARAMS *setp = set #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 = *((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 (NEED_LENGTH_TEST && outptr == outend) \ { \ result = GCONV_FULL_OUTPUT; \ break; \ } \ } \ \ *outptr++ = ch; \ written = 1; \ } \ else \ { \ char buf[2]; \ \ written = ucs4_to_ksc5601 (ch, buf, 2); \ \ if (written == UNKNOWN_10646_CHAR) \ { \ /* Illegal character. */ \ result = GCONV_ILLEGAL_INPUT; \ break; \ } \ assert (written == 2); \ \ /* We use KSC 5601. */ \ if (set != KSC5601_set) \ { \ *outptr++ = SO; \ set = KSC5601_set; \ } \ \ 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 #define UPDATE_PARAMS *setp = set #include /* Now define the toplevel functions. */ #include