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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
281 lines
9.3 KiB
C
281 lines
9.3 KiB
C
/* Conversion to and from IBM939.
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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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/* IBM939 is designed for the representation of Japanese Latin/Kanji
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using a stateful EBCDIC encoding scheme. It is also known as
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CCSID 939 or CP939. See:
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https://www-01.ibm.com/software/globalization/ccsid/ccsid939.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 "ibm939.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 "IBM939//"
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#define FROM_LOOP from_ibm939
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#define TO_LOOP to_ibm939
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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-939 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 IBM939 table for single byte. */ \
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res = __ibm939sb_to_ucs4[ch]; \
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if (__builtin_expect (res == L'\0', 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 IBM939 table for double byte. */ \
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const struct gap *rp2 = __ibm939db_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 = __ibm939db_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_ibm939sb_idx; \
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const struct gap *rp2 = __ucs4_to_ibm939db_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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goto ibm939_invalid_char; \
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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_ibm939sb[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_ibm939db[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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ibm939_invalid_char: \
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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++ = 0xa0; \
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else if (ch == 0x5c) \
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*outptr++ = 0xb2; \
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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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