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glibc/iconvdata/iso-2022-jp.c
Ulrich Drepper 77b341f865 When translating to ISO-2022-JP* write escape sequences out even if the 
character itself does not fit into the buffer.
1999-09-06 07:59:54 +00:00

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/* Conversion module for ISO-2022-JP.
Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <gconv.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "jis0201.h"
#include "jis0208.h"
#include "jis0212.h"
#include "gb2312.h"
#include "ksc5601.h"
struct gap
{
uint16_t start;
uint16_t end;
int32_t idx;
};
#include "iso8859-7jp.h"
/* This makes obvious what everybody knows: 0x1b is the Esc character. */
#define ESC 0x1b
/* We provide our own initialization and destructor function. */
#define DEFINE_INIT 0
#define DEFINE_FINI 0
/* Definitions used in the body of the `gconv' function. */
#define FROM_LOOP from_iso2022jp_loop
#define TO_LOOP to_iso2022jp_loop
#define MIN_NEEDED_FROM 1
#define MAX_NEEDED_FROM 4
#define MIN_NEEDED_TO 4
#define MAX_NEEDED_TO 4
#define FROM_DIRECTION (dir == from_iso2022jp)
#define PREPARE_LOOP \
enum direction dir = ((struct iso2022jp_data *) step->data)->dir; \
enum variant var = ((struct iso2022jp_data *) step->data)->var; \
int save_set; \
int *setp = &data->statep->count;
#define EXTRA_LOOP_ARGS , var, setp
/* Direction of the transformation. */
enum direction
{
illegal_dir,
to_iso2022jp,
from_iso2022jp
};
/* We handle ISO-2022-jp and ISO-2022-JP-2 here. */
enum variant
{
illegal_var,
iso2022jp,
iso2022jp2
};
struct iso2022jp_data
{
enum direction dir;
enum variant var;
};
/* The COUNT element of the state keeps track of the currently selected
character set. The possible values are: */
enum
{
ASCII_set = 0,
JISX0208_1978_set,
JISX0208_1983_set,
JISX0201_Roman_set,
JISX0201_Kana_set,
GB2312_set,
KSC5601_set,
JISX0212_set
};
/* The second value stored is the designation of the G2 set. The following
values are possible: */
enum
{
UNSPECIFIED_set = 0,
ISO88591_set,
ISO88597_set
};
int
gconv_init (struct gconv_step *step)
{
/* Determine which direction. */
struct iso2022jp_data *new_data;
enum direction dir = illegal_dir;
enum variant var = illegal_var;
int result;
if (__strcasecmp (step->from_name, "ISO-2022-JP//") == 0)
{
dir = from_iso2022jp;
var = iso2022jp;
}
else if (__strcasecmp (step->to_name, "ISO-2022-JP//") == 0)
{
dir = to_iso2022jp;
var = iso2022jp;
}
else if (__strcasecmp (step->from_name, "ISO-2022-JP-2//") == 0)
{
dir = from_iso2022jp;
var = iso2022jp2;
}
else if (__strcasecmp (step->to_name, "ISO-2022-JP-2//") == 0)
{
dir = to_iso2022jp;
var = iso2022jp2;
}
result = GCONV_NOCONV;
if (dir != illegal_dir)
{
new_data
= (struct iso2022jp_data *) malloc (sizeof (struct iso2022jp_data));
result = GCONV_NOMEM;
if (new_data != NULL)
{
new_data->dir = dir;
new_data->var = var;
step->data = new_data;
if (dir == from_iso2022jp)
{
step->min_needed_from = MIN_NEEDED_FROM;
step->max_needed_from = MAX_NEEDED_FROM;
step->min_needed_to = MIN_NEEDED_TO;
step->max_needed_to = MAX_NEEDED_TO;
}
else
{
step->min_needed_from = MIN_NEEDED_TO;
step->max_needed_from = MAX_NEEDED_TO;
step->min_needed_to = MIN_NEEDED_FROM;
step->max_needed_to = MAX_NEEDED_FROM + 2;
}
/* Yes, this is a stateful encoding. */
step->stateful = 1;
result = GCONV_OK;
}
}
return result;
}
void
gconv_end (struct gconv_step *data)
{
free (data->data);
}
/* 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 != ASCII_set) \
{ \
enum direction dir = ((struct iso2022jp_data *) step->data)->dir; \
\
if (dir == from_iso2022jp) \
/* It's easy, we don't have to emit anything, we just reset the \
state for the input. Note that this also clears the G2 \
designation. */ \
data->statep->count = ASCII_set; \
else \
{ \
unsigned char *outbuf = data->outbuf; \
\
/* We are not in the initial state. To switch back we have \
to emit the sequence `Esc ( B'. */ \
if (outbuf + 3 > data->outbufend) \
/* We don't have enough room in the output buffer. */ \
status = GCONV_FULL_OUTPUT; \
else \
{ \
/* Write out the shift sequence. */ \
*outbuf++ = ESC; \
*outbuf++ = '('; \
*outbuf++ = 'B'; \
data->outbuf = outbuf; \
/* Note that this also clears the G2 designation. */ \
data->statep->count = ASCII_set; \
} \
} \
}
/* 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_set = *setp; \
else \
*setp = save_set
/* First define the conversion function from ISO-2022-JP to UCS4. */
#define MIN_NEEDED_INPUT MIN_NEEDED_FROM
#define MAX_NEEDED_INPUT MAX_NEEDED_FROM
#define MIN_NEEDED_OUTPUT MIN_NEEDED_TO
#define LOOPFCT FROM_LOOP
#define BODY \
{ \
uint32_t ch = *inptr; \
\
/* Recognize escape sequences. */ \
if (ch == ESC) \
{ \
/* We now must be prepared to read two to three more \
chracters. If we have a match in the first character but \
then the input buffer ends we terminate with an error since \
we must not risk missing an escape sequence just because it \
is not entirely in the current input buffer. */ \
if (inptr + 2 >= inend \
|| (var == iso2022jp2 && inptr[1] == '$' && inptr[2] == '(' \
&& inptr + 3 >= inend)) \
{ \
/* Not enough input available. */ \
result = GCONV_EMPTY_INPUT; \
break; \
} \
\
if (inptr[1] == '(') \
{ \
if (inptr[2] == 'B') \
{ \
/* ASCII selected. */ \
set = ASCII_set; \
inptr += 3; \
continue; \
} \
else if (inptr[2] == 'J') \
{ \
/* JIS X 0201 selected. */ \
set = JISX0201_Roman_set; \
inptr += 3; \
continue; \
} \
else if (var == iso2022jp2 && inptr[2] == 'I') \
{ \
/* JIS X 0201 selected. */ \
set = JISX0201_Kana_set; \
inptr += 3; \
continue; \
} \
} \
else if (inptr[1] == '$') \
{ \
if (inptr[2] == '@') \
{ \
/* JIS X 0208-1978 selected. */ \
set = JISX0208_1978_set; \
inptr += 3; \
continue; \
} \
else if (inptr[2] == 'B') \
{ \
/* JIS X 0208-1983 selected. */ \
set = JISX0208_1983_set; \
inptr += 3; \
continue; \
} \
else if (var == iso2022jp2) \
{ \
if (inptr[2] == 'A') \
{ \
/* GB 2312-1980 selected. */ \
set = GB2312_set; \
inptr += 3; \
continue; \
} \
else if (inptr[2] == '(') \
{ \
if (inptr[3] == 'C') \
{ \
/* KSC 5601-1987 selected. */ \
set = KSC5601_set; \
inptr += 4; \
continue; \
} \
else if (inptr[3] == 'D') \
{ \
/* JIS X 0212-1990 selected. */ \
set = JISX0212_set; \
inptr += 4; \
continue; \
} \
} \
} \
} \
else if (var == iso2022jp2 && inptr[1] == '.') \
{ \
if (inptr[2] == 'A') \
{ \
/* ISO 8859-1-GR selected. */ \
set2 = ISO88591_set; \
inptr += 3; \
continue; \
} \
else if (inptr[2] == 'F') \
{ \
/* ISO 8859-7-GR selected. */ \
set2 = ISO88597_set; \
inptr += 3; \
continue; \
} \
} \
} \
\
if (ch == ESC && var == iso2022jp2 && inptr[1] == 'N') \
{ \
if (set2 == ISO88591_set) \
{ \
ch = inptr[2] | 0x80; \
inptr += 3; \
} \
else if (set2 == ISO88597_set) \
{ \
/* We use the table from the ISO 8859-7 module. */ \
if (inptr[2] < 0x20 || inptr[2] > 0x80) \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
ch = iso88597_to_ucs4[inptr[2] - 0x20]; \
if (ch == 0) \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
inptr += 3; \
} \
else \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
} \
else if (set == ASCII_set || (ch < 0x21 || ch == 0x7f)) \
/* Almost done, just advance the input pointer. */ \
++inptr; \
else if (set == JISX0201_Roman_set) \
{ \
/* Use the JIS X 0201 table. */ \
ch = jisx0201_to_ucs4 (ch); \
if (ch == UNKNOWN_10646_CHAR) \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
++inptr; \
} \
else if (set == JISX0201_Kana_set) \
{ \
/* Use the JIS X 0201 table. */ \
ch = jisx0201_to_ucs4 (ch + 0x80); \
if (ch == UNKNOWN_10646_CHAR) \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
++inptr; \
} \
else \
{ \
if (set == JISX0208_1978_set || set == JISX0208_1983_set) \
/* XXX I don't have the tables for these two old variants of \
JIS X 0208. Therefore I'm using the tables for JIS X \
0208-1990. If somebody has problems with this please \
provide the appropriate tables. */ \
ch = jisx0208_to_ucs4 (&inptr, \
NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
else if (set == JISX0212_set) \
/* Use the JIS X 0212 table. */ \
ch = jisx0212_to_ucs4 (&inptr, \
NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
else if (set == GB2312_set) \
/* Use the GB 2312 table. */ \
ch = gb2312_to_ucs4 (&inptr, \
NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
else \
{ \
assert (set == KSC5601_set); \
\
/* Use the KSC 5601 table. */ \
ch = ksc5601_to_ucs4 (&inptr, \
NEED_LENGTH_TEST ? inend - inptr : 2, 0); \
} \
\
if (NEED_LENGTH_TEST && ch == 0) \
{ \
result = GCONV_EMPTY_INPUT; \
break; \
} \
else if (ch == UNKNOWN_10646_CHAR) \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
} \
\
*((uint32_t *) outptr)++ = ch; \
}
#define EXTRA_LOOP_DECLS , enum variant var, int *setp
#define INIT_PARAMS int set = *setp % 0x100, set2 = *setp / 0x100
#define UPDATE_PARAMS *setp = (set2 << 8) + set
#include <iconv/loop.c>
/* Next, define the other direction. */
#define MIN_NEEDED_INPUT MIN_NEEDED_TO
#define MIN_NEEDED_OUTPUT MIN_NEEDED_FROM
#define MAX_NEEDED_OUTPUT (MAX_NEEDED_FROM + 2)
#define LOOPFCT TO_LOOP
#define BODY \
{ \
uint32_t ch; \
size_t written = 0; \
\
ch = *((uint32_t *) inptr); \
\
/* First see whether we can write the character using the currently \
selected character set. */ \
if (set == ASCII_set) \
{ \
/* Please note that the NUL byte is *not* matched if we are not \
currently using the ASCII charset. This is because we must \
switch to the initial state whenever a NUL byte is written. */ \
if (ch <= 0x7f) \
{ \
*outptr++ = ch; \
written = 1; \
} \
/* At the beginning of a line, G2 designation is cleared. */ \
if (var == iso2022jp2 && ch == 0x0a) \
set2 = UNSPECIFIED_set; \
} \
/* ISO-2022-JP recommends to encode the newline character always in \
ASCII since this allows a context-free interpretation of the \
characters at the beginning of the next line. Otherwise it would \
have to be known whether the last line ended using ASCII or \
JIS X 0201. */ \
else if (set == JISX0201_Roman_set) \
{ \
unsigned char buf[2]; \
written = ucs4_to_jisx0201 (ch, buf); \
if (written != UNKNOWN_10646_CHAR && buf[0] > 0x20 && buf[0] < 0x80) \
{ \
*outptr++ = buf[0]; \
written = 1; \
} \
else \
written = UNKNOWN_10646_CHAR; \
} \
else if (set == JISX0201_Kana_set) \
{ \
unsigned char buf[2]; \
written = ucs4_to_jisx0201 (ch, buf); \
if (written != UNKNOWN_10646_CHAR && buf[0] > 0xa0 && buf[0] < 0xe0) \
{ \
*outptr++ = buf[0] - 0x80; \
written = 1; \
} \
else \
written = UNKNOWN_10646_CHAR; \
} \
else \
{ \
if (set == JISX0208_1978_set || set == JISX0208_1983_set) \
written = ucs4_to_jisx0208 (ch, outptr, \
(NEED_LENGTH_TEST \
? outend - outptr : 2)); \
else if (set == JISX0212_set) \
written = ucs4_to_jisx0212 (ch, outptr, \
(NEED_LENGTH_TEST \
? outend - outptr : 2)); \
else if (set == GB2312_set) \
written = ucs4_to_gb2312 (ch, outptr, (NEED_LENGTH_TEST \
? outend - outptr : 2)); \
else \
{ \
assert (set == KSC5601_set); \
\
written = ucs4_to_ksc5601 (ch, outptr, \
(NEED_LENGTH_TEST \
? outend - outptr : 2)); \
} \
\
if (NEED_LENGTH_TEST && written == 0) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
else if (written != UNKNOWN_10646_CHAR) \
outptr += written; \
} \
\
if (written == UNKNOWN_10646_CHAR || written == 0) \
{ \
if (set2 == ISO88591_set) \
{ \
if (ch >= 0x80 && ch <= 0xff) \
{ \
*outptr++ = ESC; \
*outptr++ = 'N'; \
*outptr++ = ch & 0x7f; \
written = 3; \
} \
} \
else if (set2 == ISO88597_set) \
{ \
const struct gap *rp = from_idx; \
\
while (ch > rp->end) \
++rp; \
if (ch >= rp->start) \
{ \
unsigned char res = iso88597_from_ucs4[ch - 0xa0 + rp->idx]; \
if (res != '\0') \
{ \
*outptr++ = ESC; \
*outptr++ = 'N'; \
*outptr++ = res; \
written = 3; \
} \
} \
} \
} \
\
if (written == UNKNOWN_10646_CHAR || written == 0) \
{ \
/* Either this is an unknown character or we have to switch \
the currently selected character set. The character sets \
do not code entirely separate parts of ISO 10646 and \
therefore there is no single correct result. If we choose \
the character set to use wrong we might be end up with \
using yet another character set for the next character \
though the current and the next could be encoded with one \
character set. We leave this kind of optimization for \
later and now simply use a fixed order in which we test for \
availability */ \
\
if (ch <= 0x7f) \
{ \
/* We must encode using ASCII. First write out the \
escape sequence. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '('; \
*outptr++ = 'B'; \
set = ASCII_set; \
\
if (NEED_LENGTH_TEST && outptr + 1 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ch; \
\
/* At the beginning of a line, G2 designation is cleared. */ \
if (var == iso2022jp2 && ch == 0x0a) \
set2 = UNSPECIFIED_set; \
} \
else \
{ \
/* Now it becomes difficult. We must search the other \
character sets one by one and we cannot use simple \
arithmetic to determine whether the character can be \
encoded using this set. */ \
size_t written; \
unsigned char buf[2]; \
\
written = ucs4_to_jisx0201 (ch, buf); \
if (written != UNKNOWN_10646_CHAR && buf[0] < 0x80) \
{ \
/* We use JIS X 0201. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '('; \
*outptr++ = 'J'; \
set = JISX0201_Roman_set; \
\
if (NEED_LENGTH_TEST && outptr + 1 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0]; \
} \
else \
{ \
written = ucs4_to_jisx0208 (ch, buf, 2); \
if (written != UNKNOWN_10646_CHAR) \
{ \
/* We use JIS X 0208. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '$'; \
*outptr++ = 'B'; \
set = JISX0208_1983_set; \
\
if (NEED_LENGTH_TEST && outptr + 2 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0]; \
*outptr++ = buf[1]; \
} \
else if (var == iso2022jp) \
{ \
/* We have no other choice. */ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
else \
{ \
written = ucs4_to_jisx0212 (ch, buf, 2); \
if (written != UNKNOWN_10646_CHAR) \
{ \
/* We use JIS X 0212. */ \
if (NEED_LENGTH_TEST && outptr + 4 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '$'; \
*outptr++ = '('; \
*outptr++ = 'D'; \
set = JISX0212_set; \
\
if (NEED_LENGTH_TEST && outptr + 2 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0]; \
*outptr++ = buf[1]; \
} \
else \
{ \
written = ucs4_to_jisx0201 (ch, buf); \
if (written != UNKNOWN_10646_CHAR && buf[0] >= 0x80) \
{ \
/* We use JIS X 0201. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '('; \
*outptr++ = 'I'; \
set = JISX0201_Kana_set; \
\
if (NEED_LENGTH_TEST && outptr + 1 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0] - 0x80; \
} \
else if (ch != 0xa5 && ch >= 0x80 && ch <= 0xff) \
{ \
/* ISO 8859-1 upper half. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '.'; \
*outptr++ = 'A'; \
set2 = ISO88591_set; \
\
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = 'N'; \
*outptr++ = ch; \
} \
else \
{ \
written = ucs4_to_gb2312 (ch, buf, 2); \
if (written != UNKNOWN_10646_CHAR) \
{ \
/* We use GB 2312. */ \
if (NEED_LENGTH_TEST && outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '$'; \
*outptr++ = 'A'; \
set = GB2312_set; \
\
if (NEED_LENGTH_TEST && outptr + 2 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0]; \
*outptr++ = buf[1]; \
} \
else \
{ \
written = ucs4_to_ksc5601 (ch, buf, 2); \
if (written != UNKNOWN_10646_CHAR) \
{ \
/* We use KSC 5601. */ \
if (NEED_LENGTH_TEST \
&& outptr + 4 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '$'; \
*outptr++ = '('; \
*outptr++ = 'C'; \
set = KSC5601_set; \
\
if (NEED_LENGTH_TEST \
&& outptr + 2 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = buf[0]; \
*outptr++ = buf[1]; \
} \
else \
{ \
const struct gap *rp = from_idx; \
unsigned char gch = 0; \
\
while (ch > rp->end) \
++rp; \
if (ch >= rp->start) \
{ \
ch = ch - 0xa0 + rp->idx; \
gch = iso88597_from_ucs4[ch]; \
} \
\
if (gch != 0) \
{ \
/* We use ISO 8859-7 greek. */ \
if (NEED_LENGTH_TEST \
&& outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = '.'; \
*outptr++ = 'F'; \
set2 = ISO88597_set; \
\
if (NEED_LENGTH_TEST \
&& outptr + 3 > outend) \
{ \
result = GCONV_FULL_OUTPUT; \
break; \
} \
*outptr++ = ESC; \
*outptr++ = 'N'; \
*outptr++ = gch; \
} \
else \
{ \
result = GCONV_ILLEGAL_INPUT; \
break; \
} \
} \
} \
} \
} \
} \
} \
} \
} \
\
/* Now that we wrote the output increment the input pointer. */ \
inptr += 4; \
}
#define EXTRA_LOOP_DECLS , enum variant var, int *setp
#define INIT_PARAMS int set = *setp % 0x100, set2 = *setp / 0x100
#define UPDATE_PARAMS *setp = (set2 << 8) + set
#include <iconv/loop.c>
/* Now define the toplevel functions. */
#include <iconv/skeleton.c>
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