mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-27 07:20:11 +00:00
4de3b51e08
Add comments for IBM930, IBM933, IBM935, IBM937, and IBM939 which explain exactly what purpose these encodings have and provide a URL to the upstream IBM database that further provides the details of the encoding.
285 lines
9.4 KiB
C
285 lines
9.4 KiB
C
/* Conversion from and to IBM933.
|
|
Copyright (C) 2000-2015 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Masahide Washizawa <washi@yamato.ibm.co.jp>, 2000.
|
|
|
|
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
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
/* IBM933 is designed for the representation of Korean using a stateful
|
|
EBCDIC encoding scheme. It is also known as CCSID 933 or CP933. See:
|
|
https://www-01.ibm.com/software/globalization/ccsid/ccsid933.html */
|
|
|
|
#include <dlfcn.h>
|
|
#include <stdint.h>
|
|
#include <wchar.h>
|
|
#include <byteswap.h>
|
|
#include "ibm933.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 "IBM933//"
|
|
#define FROM_LOOP from_ibm933
|
|
#define TO_LOOP to_ibm933
|
|
#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-933 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. */ \
|
|
if (curcs == db) \
|
|
{ \
|
|
result = __GCONV_ILLEGAL_INPUT; \
|
|
break; \
|
|
} \
|
|
curcs = db; \
|
|
++inptr; \
|
|
continue; \
|
|
} \
|
|
else if (__builtin_expect (ch, 0) == SI) \
|
|
{ \
|
|
/* Shift IN, change to SBCS converter. */ \
|
|
if (curcs == sb) \
|
|
{ \
|
|
result = __GCONV_ILLEGAL_INPUT; \
|
|
break; \
|
|
} \
|
|
curcs = sb; \
|
|
++inptr; \
|
|
continue; \
|
|
} \
|
|
\
|
|
if (curcs == sb) \
|
|
{ \
|
|
/* Use the IBM933 table for single byte. */ \
|
|
res = __ibm933sb_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 = __ibm933db_to_ucs4_idx; \
|
|
\
|
|
assert (curcs == db); \
|
|
\
|
|
/* Use the IBM933 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 = __ibm933db_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_ibm933sb_idx; \
|
|
const struct gap *rp2 = __ucs4_to_ibm933db_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_ibm933sb[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_ibm933db[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; \
|
|
} \
|
|
\
|
|
if (__glibc_unlikely (outptr + 1 > outend)) \
|
|
{ \
|
|
result = __GCONV_FULL_OUTPUT; \
|
|
break; \
|
|
} \
|
|
*outptr++ = cp[0]; \
|
|
curcs = sb; \
|
|
} \
|
|
\
|
|
/* 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>
|