mirror of git://sourceware.org/git/glibc.git
282 lines
9.3 KiB
C
282 lines
9.3 KiB
C
/* Conversion from and to IBM930.
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Copyright (C) 2000-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* IBM930 is designed for the representation of Japanese Katakana/Kanji
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using a stateful EBCDIC encoding scheme. It is also known as
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CCSID 930 or CP930. See:
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https://www-01.ibm.com/software/globalization/ccsid/ccsid930.html */
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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 "ibm930.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 "IBM930//"
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#define FROM_LOOP from_ibm930
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#define TO_LOOP to_ibm930
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#define ONE_DIRECTION 0
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#define FROM_LOOP_MIN_NEEDED_FROM 1
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#define FROM_LOOP_MAX_NEEDED_FROM 2
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#define FROM_LOOP_MIN_NEEDED_TO 4
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#define FROM_LOOP_MAX_NEEDED_TO 4
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#define TO_LOOP_MIN_NEEDED_FROM 4
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#define TO_LOOP_MAX_NEEDED_FROM 4
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#define TO_LOOP_MIN_NEEDED_TO 1
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#define TO_LOOP_MAX_NEEDED_TO 3
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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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/* We are not in the initial state. To switch back we have \
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to emit `SI'. */ \
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if (__glibc_unlikely (outbuf >= outend)) \
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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->__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-930 to UCS4. */
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#define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO
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#define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_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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uint32_t res; \
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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 (redundant escape okay). */ \
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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 (redundant escape okay). */ \
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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 IBM930 table for single byte. */ \
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res = __ibm930sb_to_ucs4[ch]; \
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if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0') \
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{ \
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/* This is an illegal character. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (1); \
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} \
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else \
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{ \
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put32 (outptr, res); \
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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 IBM930 table for double byte. */ \
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const struct gap *rp2 = __ibm930db_to_ucs4_idx; \
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\
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assert (curcs == db); \
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\
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if (__glibc_unlikely (inptr + 1 >= inend)) \
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{ \
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/* The second character is not available. Store the \
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intermediate result. */ \
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result = __GCONV_INCOMPLETE_INPUT; \
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break; \
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} \
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\
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ch = (ch * 0x100) + inptr[1]; \
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while (ch > rp2->end) \
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++rp2; \
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\
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if (__builtin_expect (rp2->start == 0xffff, 0) \
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|| __builtin_expect (ch < rp2->start, 0) \
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|| (res = __ibm930db_to_ucs4[ch + rp2->idx], \
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__builtin_expect (res, L'\1') == L'\0' && ch != '\0')) \
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{ \
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/* This is an illegal character. */ \
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STANDARD_FROM_LOOP_ERR_HANDLER (2); \
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} \
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else \
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{ \
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put32 (outptr, res); \
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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 TO_LOOP_MIN_NEEDED_FROM
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#define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM
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#define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO
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#define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO
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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 struct gap *rp1 = __ucs4_to_ibm930sb_idx; \
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const struct gap *rp2 = __ucs4_to_ibm930db_idx; \
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\
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if (__glibc_unlikely (ch >= 0xffff)) \
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{ \
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UNICODE_TAG_HANDLER (ch, 4); \
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\
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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} \
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\
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while (ch > rp1->end) \
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++rp1; \
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\
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/* Use the UCS4 table for single byte. */ \
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unsigned char sbconv; \
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if (__builtin_expect (ch < rp1->start, 0) \
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|| (sbconv = __ucs4_to_ibm930sb[ch + rp1->idx], \
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__builtin_expect (sbconv, L'\1') == L'\0' && ch != '\0')) \
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{ \
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/* Use the UCS4 table for double byte. */ \
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while (ch > rp2->end) \
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++rp2; \
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\
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const char *cp; \
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if (__builtin_expect (ch < rp2->start, 0) \
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|| (cp = __ucs4_to_ibm930db[ch + rp2->idx], \
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__builtin_expect (cp[0], L'\1')== L'\0' && ch != '\0')) \
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{ \
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/* This is an illegal character. */ \
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STANDARD_TO_LOOP_ERR_HANDLER (4); \
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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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if (__glibc_unlikely (outptr + 1 > 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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*outptr++ = SO; \
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curcs = db; \
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} \
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\
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if (__glibc_unlikely (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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*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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if (__glibc_unlikely (outptr + 1 > 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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*outptr++ = SI; \
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curcs = sb; \
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} \
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\
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if (__glibc_unlikely (outptr + 1 > 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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if (ch == 0x7e) \
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*outptr++ = 0xa1; \
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else if (ch == 0x5c) \
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*outptr++ = 0x5b; \
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else \
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*outptr++ = sbconv; \
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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 REINIT_PARAMS 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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