251 lines
8.1 KiB
C
251 lines
8.1 KiB
C
/* Conversion to and from IBM937.
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000.
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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 <dlfcn.h>
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#include <stdint.h>
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#include <wchar.h>
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#include <byteswap.h>
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#include "ibm937.h"
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/* The shift sequences for this charset (it does not use ESC). */
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#define SI 0x0F /* Shift In, host code to turn DBCS off. */
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#define SO 0x0E /* Shift Out, host code to turn DBCS on. */
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/* Definitions used in the body of the `gconv' function. */
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#define CHARSET_NAME "IBM937//"
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#define FROM_LOOP from_ibm937
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#define TO_LOOP to_ibm937
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#define MIN_NEEDED_FROM 1
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#define MAX_NEEDED_FROM 2
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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_curcs; \
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int *curcsp = &data->__statep->__count;
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#define EXTRA_LOOP_ARGS , curcsp
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/* Definitions of initialization and destructor function. */
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#define DEFINE_INIT 1
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#define DEFINE_FINI 1
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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 & ~7) != sb) \
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{ \
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if (FROM_DIRECTION) \
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data->__statep->__count &= 7; \
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else \
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{ \
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unsigned 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 `SI'. */ \
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if (__builtin_expect (outbuf >= data->__outbufend, 0)) \
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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++ = SI; \
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data->__outbuf = outbuf; \
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data->__statep->__count &= 7; \
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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_curcs = *curcsp; \
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else \
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*curcsp = save_curcs
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/* Current codeset type. */
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enum
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{
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sb = 0,
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db = 64
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};
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/* First, define the conversion function from IBM-937 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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if (__builtin_expect (ch, 0) == SO) \
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{ \
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/* Shift OUT, change to DBCS converter. */ \
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if (curcs == db) \
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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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curcs = db; \
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++inptr; \
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continue; \
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} \
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else if (__builtin_expect (ch, 0) == SI) \
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{ \
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/* Shift IN, change to SBCS converter. */ \
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if (curcs == sb) \
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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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curcs = sb; \
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++inptr; \
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continue; \
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} \
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\
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if (curcs == sb) \
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{ \
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/* Use the UCS4 table for single byte. */ \
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ch = __ibm937sb_to_ucs4[ch]; \
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if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0') \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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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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++*irreversible; \
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} \
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else \
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{ \
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put32 (outptr, ch); \
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outptr += 4; \
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} \
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++inptr; \
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} \
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else \
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{ \
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/* Use the IBM937 table for double byte. */ \
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\
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assert (curcs == db); \
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\
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ch = ibm937db_to_ucs4(inptr[0], inptr[1]); \
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if (__builtin_expect (ch, L'\1') == L'\0' && *inptr != '\0') \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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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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++*irreversible; \
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} \
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else \
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{ \
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put32 (outptr, ch); \
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outptr += 4; \
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} \
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inptr += 2; \
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} \
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}
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#define LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS , int *curcsp
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#define INIT_PARAMS int curcs = *curcsp & ~7
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#define UPDATE_PARAMS *curcsp = curcs
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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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uint32_t ch = get32 (inptr); \
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const char *cp; \
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\
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/* Use the UCS4 table for single byte. */ \
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cp = __ucs4_to_ibm937sb[ch]; \
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if (__builtin_expect (ch >= (sizeof (__ucs4_to_ibm937sb) \
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/ sizeof (__ucs4_to_ibm937sb[0])), 0) \
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|| (__builtin_expect (cp[0], '\1') == '\0' && ch != 0)) \
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{ \
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/* Use the UCS4 table for double byte. */ \
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cp = __ucs4_to_ibm937db[ch]; \
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if (__builtin_expect (ch >= (sizeof (__ucs4_to_ibm937db) \
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/ sizeof (__ucs4_to_ibm937db[0])), 0) \
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|| __builtin_expect (cp[0], '\1') == '\0') \
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{ \
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/* This is an illegal character. */ \
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if (! ignore_errors_p ()) \
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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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++*irreversible; \
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} \
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else \
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{ \
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if (curcs == sb) \
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{ \
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*outptr++ = SO; \
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curcs = db; \
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} \
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if (__builtin_expect (outptr + 1 >= outend, 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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*outptr++ = cp[0]; \
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*outptr++ = cp[1]; \
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} \
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} \
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else \
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{ \
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if (curcs == db) \
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{ \
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*outptr++ = SI; \
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curcs = sb; \
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if (__builtin_expect (outptr == outend, 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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} \
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*outptr++ = cp[0]; \
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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 LOOP_NEED_FLAGS
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#define EXTRA_LOOP_DECLS , int *curcsp
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#define INIT_PARAMS int curcs = *curcsp & ~7
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#define UPDATE_PARAMS *curcsp = curcs
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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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