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/* Conversion from and to IBM937.
Copyright (C) 2000-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
/* IBM937 is designed for the representation of Traditional Chinese
using a stateful EBCDIC encoding scheme. It is also known as
CCSID 937 or CP937. See:
https://www-01.ibm.com/software/globalization/ccsid/ccsid937.html */
#include <dlfcn.h>
#include <stdint.h>
#include <wchar.h>
#include <byteswap.h>
#include "ibm937.h"
/* The shift sequences for this charset (it does not use ESC). */
#define SI 0x0F /* Shift In, host code to turn DBCS off. */
#define SO 0x0E /* Shift Out, host code to turn DBCS on. */
/* Definitions used in the body of the `gconv' function. */
#define CHARSET_NAME "IBM937//"
#define FROM_LOOP from_ibm937
#define TO_LOOP to_ibm937
#define ONE_DIRECTION 0
#define FROM_LOOP_MIN_NEEDED_FROM 1
#define FROM_LOOP_MAX_NEEDED_FROM 2
#define FROM_LOOP_MIN_NEEDED_TO 4
#define FROM_LOOP_MAX_NEEDED_TO 4
#define TO_LOOP_MIN_NEEDED_FROM 4
#define TO_LOOP_MAX_NEEDED_FROM 4
#define TO_LOOP_MIN_NEEDED_TO 1
#define TO_LOOP_MAX_NEEDED_TO 3
#define PREPARE_LOOP \
int save_curcs; \
int *curcsp = &data->__statep->__count;
#define EXTRA_LOOP_ARGS , curcsp
/* Definitions of initialization and destructor function. */
#define DEFINE_INIT 1
#define DEFINE_FINI 1
/* 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 & ~7) != sb) \
{ \
if (FROM_DIRECTION) \
data->__statep->__count &= 7; \
else \
{ \
/* We are not in the initial state. To switch back we have \
to emit `SI'. */ \
if (__glibc_unlikely (outbuf >= outend)) \
/* We don't have enough room in the output buffer. */ \
status = __GCONV_FULL_OUTPUT; \
else \
{ \
/* Write out the shift sequence. */ \
*outbuf++ = SI; \
data->__statep->__count &= 7; \
} \
} \
}
/* 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_curcs = *curcsp; \
else \
*curcsp = save_curcs
/* Current codeset type. */
enum
{
sb = 0,
db = 64
};
/* First, define the conversion function from IBM-937 to UCS4. */
#define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t ch = *inptr; \
uint32_t res; \
\
if (__builtin_expect (ch, 0) == SO) \
{ \
/* Shift OUT, change to DBCS converter (redundant escape okay). */ \
curcs = db; \
++inptr; \
continue; \
} \
else if (__builtin_expect (ch, 0) == SI) \
{ \
/* Shift IN, change to SBCS converter (redundant escape okay). */ \
curcs = sb; \
++inptr; \
continue; \
} \
\
if (curcs == sb) \
{ \
/* Use the IBM937 table for single byte. */ \
res = __ibm937sb_to_ucs4[ch]; \
if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0') \
{ \
/* This is an illegal character. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (1); \
} \
else \
{ \
put32 (outptr, res); \
outptr += 4; \
} \
++inptr; \
} \
else \
{ \
const struct gap *rp2 = __ibm937db_to_ucs4_idx; \
\
assert (curcs == db); \
\
/* Use the IBM937 table for double byte. */ \
if (__glibc_unlikely (inptr + 1 >= inend)) \
{ \
/* The second character is not available. \
Store the intermediate result. */ \
result = __GCONV_INCOMPLETE_INPUT; \
break; \
} \
\
ch = (ch * 0x100) + inptr[1]; \
while (ch > rp2->end) \
++rp2; \
\
if (__builtin_expect (rp2->start == 0xffff, 0) \
|| __builtin_expect (ch < rp2->start, 0) \
|| (res = __ibm937db_to_ucs4[ch + rp2->idx], \
__builtin_expect (res, L'\1') == L'\0' && ch != '\0')) \
{ \
/* This is an illegal character. */ \
STANDARD_FROM_LOOP_ERR_HANDLER (2); \
} \
else \
{ \
put32 (outptr, res); \
outptr += 4; \
} \
inptr += 2; \
} \
}
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS , int *curcsp
#define INIT_PARAMS int curcs = *curcsp & ~7
#define UPDATE_PARAMS *curcsp = curcs
#include <iconv/loop.c>
/* Next, define the other direction. */
#define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO
#define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO
#define LOOPFCT TO_LOOP
#define BODY \
{ \
uint32_t ch = get32 (inptr); \
const struct gap *rp1 = __ucs4_to_ibm937sb_idx; \
const struct gap *rp2 = __ucs4_to_ibm937db_idx; \
const char *cp; \
\
if (__glibc_unlikely (ch >= 0xffff)) \
{ \
UNICODE_TAG_HANDLER (ch, 4); \
\
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
\
while (ch > rp1->end) \
++rp1; \
\
/* Use the UCS4 table for single byte. */ \
if (__builtin_expect (ch < rp1->start, 0) \
|| (cp = __ucs4_to_ibm937sb[ch + rp1->idx], \
__builtin_expect (cp[0], L'\1') == L'\0' && ch != '\0')) \
{ \
/* Use the UCS4 table for double byte. */ \
while (ch > rp2->end) \
++rp2; \
\
if (__builtin_expect (ch < rp2->start, 0) \
|| (cp = __ucs4_to_ibm937db[ch + rp2->idx], \
__builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0')) \
{ \
/* This is an illegal character. */ \
STANDARD_TO_LOOP_ERR_HANDLER (4); \
} \
else \
{ \
if (curcs == sb) \
{ \
if (__glibc_unlikely (outptr + 1 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = SO; \
curcs = db; \
} \
\
if (__glibc_unlikely (outptr + 2 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = cp[0]; \
*outptr++ = cp[1]; \
} \
} \
else \
{ \
if (curcs == db) \
{ \
if (__glibc_unlikely (outptr + 1 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = SI; \
curcs = sb; \
} \
\
if (__glibc_unlikely (outptr + 1 > outend)) \
{ \
result = __GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = cp[0]; \
} \
\
/* Now that we wrote the output increment the input pointer. */ \
inptr += 4; \
}
#define LOOP_NEED_FLAGS
#define EXTRA_LOOP_DECLS , int *curcsp
#define INIT_PARAMS int curcs = *curcsp & ~7
#define REINIT_PARAMS curcs = *curcsp & ~7
#define UPDATE_PARAMS *curcsp = curcs
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
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