274 lines
9.2 KiB
C
274 lines
9.2 KiB
C
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/* Conversion module for ISO-2022-KR.
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Copyright (C) 1998 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <gconv.h>
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#include <stdint.h>
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#include <string.h>
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#include "ksc5601.h"
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/* This makes obvious what everybody knows: 0x1b is the Esc character. */
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#define SI 0x0f
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#define SO 0x0e
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/* Definitions used in the body of the `gconv' function. */
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#define DEFINE_INIT 1
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#define DEFINE_FINI 1
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#define FROM_LOOP from_iso2022kr_loop
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#define TO_LOOP to_iso2022kr_loop
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 3
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#define MIN_NEEDED_TO 4
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#define MAX_NEEDED_TO 4
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#define PREPARE_LOOP \
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int save_set;
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int set = data->statep->count;
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/* The COUNT element of the state keeps track of the currently selected
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character set. The possible values are: */
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enum
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{
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ASCII_set = 0,
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KSC5601_set
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};
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/* Since this is a stateful encoding we have to provide code which resets
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the output state to the initial state. This has to be done during the
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flushing. */
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#define EMIT_SHIFT_TO_INIT \
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if (data->statep->count != 0) \
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{ \
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if (step->data == &from_object) \
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/* It's easy, we don't have to emit anything, we just reset the \
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state for the input. */ \
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set = 0; \
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else \
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{ \
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char *outbuf = data->outbuf; \
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\
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/* We are not in the initial state. To switch back we have \
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to emit `SO'. */ \
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if (outbuf == data->outbufend) \
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/* We don't have enough room in the output buffer. */ \
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status = GCONV_FULL_OUTPUT; \
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else \
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{ \
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/* Write out the shift sequence. */ \
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*outbuf++ = SO; \
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data->outbuf = outbuf; \
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set = 0; \
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} \
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} \
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}
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/* Since we might have to reset input pointer we must be able to save
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and retore the state. */
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#define SAVE_RESET_STATE(Save) \
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if (Save) \
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save_set = set; \
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else \
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set = save_set
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/* First define the conversion function from ISO-2022-JP to UCS4. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
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#define LOOPFCT FROM_LOOP
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#define BODY \
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{ \
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uint32_t ch = *inptr; \
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\
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/* This is a 7bit character set, disallow all 8bit characters. */ \
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if (ch > 0x7f) \
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{ \
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result = GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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\
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/* Recognize escape sequences. */ \
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if (ch == ESC) \
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{ \
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/* We don't really have to handle escape sequences since all the \
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switching is done using the SI and SO bytes. Butwe have to \
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recognize `Esc $ ) C' since this is a kind of flag for this \
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encoding. We simply ignore it. */ \
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if (inptr + 1 > inend \
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|| (inptr[1] == '$' \
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&& (inptr + 2 > inend \
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|| (inptr[2] == ')' && inptr + 3 > inend)))) \
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\
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{ \
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result = GCONV_EMPTY_INPUT; \
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break; \
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} \
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if (inptr[1] == '$' && inptr[2] == ')' && inptr[3] == 'C') \
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{ \
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/* Yeah, yeah, we know this is ISO 2022-KR. */ \
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inptr += 4; \
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continue; \
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} \
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} \
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else if (ch == SI) \
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{ \
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/* Switch to use KSC. */ \
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++inptr; \
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set = KSC5601_set; \
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continue; \
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} \
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else if (ch == SO) \
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{ \
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/* Switch to use ASCII. */ \
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++inptr; \
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set = ASCII_set; \
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continue; \
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} \
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\
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if (set == ASCII_set || ch < 0x21 || ch == 0x7f) \
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/* Almost done, just advance the input pointer. */ \
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++inptr; \
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else \
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{ \
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assert (set == KSC5601_set); \
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\
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/* Use the KSC 5601 table. */ \
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ch = ksc5601_to_ucs4 (&inptr, \
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NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
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\
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if (NEED_LENGTH_TEST && ch == 0) \
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{ \
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result = GCONV_EMPTY_INPUT; \
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break; \
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} \
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else if (ch == UNKNOWN_10646_CHAR) \
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{ \
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result = GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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} \
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\
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*((uint32_t *) outptr)++ = ch; \
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}
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#define EXTRA_LOOP_DECLS , int set
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#include <iconv/loop.c>
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/* Next, define the other direction. */
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#define MIN_NEEDED_INPUT MIN_NEEDED_TO
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#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
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#define MAX_NEEDED_OUTPUT MAX_NEEDED_FROM
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#define LOOPFCT TO_LOOP
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#define BODY \
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{ \
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unsigned char ch; \
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size_t written = 0; \
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\
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ch = *((uint32_t *) inptr); \
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\
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/* First see whether we can write the character using the currently \
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selected character set. */ \
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if (set == ASCII_set || (ch >= 0x01 && (ch < 0x21 || ch == 0x7f))) \
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{ \
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/* Please note that the NUL byte is *not* matched if we are not \
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currently using the ASCII charset. This is because we must \
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switch to the initial state whenever a NUL byte is written. */ \
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if (ch <= 0x7f) \
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{ \
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*outptr++ = ch; \
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written = 1; \
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} \
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} \
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else \
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{ \
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assert (set == KSC5601_set); \
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\
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written = ucs4_to_ksc5601 (ch, outptr, \
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(NEED_LENGTH_TEST ? outend - outptr : 2)); \
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\
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if (NEED_LENGTH_TEST && written == 0) \
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{ \
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result = GCONV_FULL_OUTPUT; \
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break; \
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} \
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if (written == UNKNOWN_10646_CHAR) \
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{ \
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/* Either this is an unknown character or we have to switch \
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the currently selected character set. The character sets \
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do not code entirely separate parts of ISO 10646 and \
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therefore there is no single correct result. If we choose \
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the character set to use wrong we might be end up with \
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using yet another character set for the next character \
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though the current and the next could be encoded with one \
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character set. We leave this kind of optimization for \
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later and now simply use a fixed order in which we test for \
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availability */ \
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\
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if (ch <= 0x7f) \
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{ \
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/* We must encode using ASCII. First write out the \
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escape sequence. */ \
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*outptr++ = SO; \
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set = ASCII_set; \
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\
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if (NEED_LENGTH_TEST && outptr == outend) \
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{ \
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result = GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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*outptr++ = ch; \
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} \
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else \
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{ \
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written = ucs4_to_ksc5601 (ch, buf, 2); \
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if (written != UNKNOWN_10646_CHAR) \
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{ \
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/* We use KSC 5601. */ \
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*outptr++ = SI; \
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set = KSC5601_set; \
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\
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if (NEED_LENGTH_TEST && outptr + 2 > outend) \
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{ \
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result = GCONV_FULL_OUTPUT; \
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break; \
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} \
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\
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*outptr++ = buf[0]; \
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*outptr++ = buf[1]; \
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} \
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else \
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{ \
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result = GCONV_ILLEGAL_INPUT; \
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break; \
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} \
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} \
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} \
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\
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/* Now that we wrote the output increment the input pointer. */ \
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inptr += 4; \
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}
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#define EXTRA_LOOP_DECLS , int set
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#include <iconv/loop.c>
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/* Now define the toplevel functions. */
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#include <iconv/skeleton.c>
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