glibc/iconvdata/euccn.c
Ulrich Drepper 2aea1d796e Update.
1998-04-13 17:40  Ulrich Drepper  <drepper@cygnus.com>

	* iconvdata/8bit-gap.c: Simplify step data handling.
	* iconvdata/8bit-generic.c: Likewise.
	* iconvdata/big5.c: Likewise.
	* iconvdata/euccn.c: Likewise.
	* iconvdata/eucjp.c: Likewise.
	* iconvdata/euckr.c: Likewise.
	* iconvdata/euctw.c: Likewise.
	* iconvdata/iso6937.c: Likewise.
	* iconvdata/iso8859-1.c: Likewise.
	* iconvdata/jis0208.h: Likewise.
	* iconvdata/jis0212.c: Likewise.
	* iconvdata/jis0212.h: Likewise.
	* iconvdata/johab.c: Likewise.
	* iconvdata/ksc5601.h: Likewise.
	* iconvdata/sjis.c: Likewise.
	* iconvdata/t61.c: Likewise.
	* iconvdata/uhc.c: Likewise.
1998-04-13 17:54:00 +00:00

278 lines
6.7 KiB
C

/* Mapping tables for EUC-CN handling.
Copyright (C) 1998 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 <string.h>
#include <wchar.h>
#include <gb2312.h>
/* Direction of the transformation. */
static int to_euccn_object;
static int from_euccn_object;
int
gconv_init (struct gconv_step *step)
{
/* Determine which direction. */
if (strcasestr (step->from_name, "EUC-CN") != NULL)
step->data = &from_euccn_object;
else if (strcasestr (step->to_name, "EUC-CN") != NULL)
step->data = &to_euccn_object;
else
return GCONV_NOCONV;
return GCONV_OK;
}
void
gconv_end (struct gconv_step *data)
{
/* Nothing to do. */
}
int
gconv (struct gconv_step *step, struct gconv_step_data *data,
const char *inbuf, size_t *inbufsize, size_t *written, int do_flush)
{
struct gconv_step *next_step = step + 1;
struct gconv_step_data *next_data = data + 1;
gconv_fct fct = next_step->fct;
size_t do_write;
int result;
/* If the function is called with no input this means we have to reset
to the initial state. The possibly partly converted input is
dropped. */
if (do_flush)
{
do_write = 0;
/* Call the steps down the chain if there are any. */
if (data->is_last)
result = GCONV_OK;
else
{
struct gconv_step *next_step = step + 1;
struct gconv_step_data *next_data = data + 1;
result = (*fct) (next_step, next_data, NULL, 0, written, 1);
/* Clear output buffer. */
data->outbufavail = 0;
}
}
else
{
do_write = 0;
do
{
result = GCONV_OK;
if (step->data == &from_euccn_object)
{
size_t inchars = *inbufsize;
size_t outwchars = data->outbufavail;
char *outbuf = data->outbuf;
size_t cnt = 0;
while (cnt < inchars
&& (outwchars + sizeof (wchar_t) <= data->outbufsize))
{
int inchar = (unsigned char) inbuf[cnt];
wchar_t ch;
if (inchar <= 0x7f)
ch = (wchar_t) inchar;
else if ((inchar <= 0xa0 || inchar > 0xfe)
&& inchar != 0x8e && inchar != 0x8f)
/* This is illegal. */
ch = L'\0';
else
{
/* Two or more byte character. First test whether the
next character is also available. */
const char *endp;
int inchar2;
if (cnt + 1 >= inchars)
{
/* The second character is not available. Store
the intermediate result. */
result = GCONV_INCOMPLETE_INPUT;
break;
}
inchar2 = (unsigned char) inbuf[++cnt];
/* All second bytes of a multibyte character must be
>= 0xa1. */
if (inchar2 < 0xa1)
{
/* This is an illegal character. */
--cnt;
result = GCONV_ILLEGAL_INPUT;
break;
}
/* This is code set 1: GB 2312-80. */
endp = &inbuf[cnt - 1];
ch = gb2312_to_ucs4 (&endp, 2, 0x80);
if (ch != L'\0')
++cnt;
if (ch == UNKNOWN_10646_CHAR)
ch = L'\0';
if (ch == L'\0')
--cnt;
}
if (ch == L'\0' && inbuf[cnt] != '\0')
{
/* This is an illegal character. */
result = GCONV_ILLEGAL_INPUT;
break;
}
*((wchar_t *) (outbuf + outwchars)) = ch;
++do_write;
outwchars += sizeof (wchar_t);
++cnt;
}
*inbufsize -= cnt;
data->outbufavail = outwchars;
}
else
{
size_t inwchars = *inbufsize;
size_t outchars = data->outbufavail;
char *outbuf = data->outbuf;
size_t cnt = 0;
int extra = 0;
while (inwchars >= cnt + sizeof (wchar_t)
&& outchars < data->outbufsize)
{
wchar_t ch = *((wchar_t *) (inbuf + cnt));
if (ch <= L'\x7f')
/* It's plain ASCII. */
outbuf[outchars] = ch;
else
{
/* Try the JIS character sets. */
size_t found;
found = ucs4_to_gb2312 (ch, &outbuf[outchars],
(data->outbufsize
- outchars));
if (found > 0)
{
/* It's a GB 2312 character, adjust it for
EUC-CN. */
outbuf[outchars++] += 0x80;
outbuf[outchars] += 0x80;
}
else if (found == 0)
{
/* We ran out of space. */
extra = 2;
break;
}
else
/* Illegal character. */
break;
}
++do_write;
++outchars;
cnt += sizeof (wchar_t);
}
*inbufsize -= cnt;
data->outbufavail = outchars;
if (outchars + extra < data->outbufsize)
{
/* If there is still room in the output buffer something
is wrong with the input. */
if (inwchars >= cnt + sizeof (wchar_t))
{
/* An error occurred. */
result = GCONV_ILLEGAL_INPUT;
break;
}
if (inwchars != cnt)
{
/* There are some unprocessed bytes at the end of the
input buffer. */
result = GCONV_INCOMPLETE_INPUT;
break;
}
}
}
if (result != GCONV_OK)
break;
if (data->is_last)
{
/* This is the last step. */
result = (*inbufsize > (step->data == &from_euccn_object
? 0 : sizeof (wchar_t) - 1)
? GCONV_FULL_OUTPUT : GCONV_EMPTY_INPUT);
break;
}
/* Status so far. */
result = GCONV_EMPTY_INPUT;
if (data->outbufavail > 0)
{
/* Call the functions below in the chain. */
size_t newavail = data->outbufavail;
result = (*fct) (next_step, next_data, data->outbuf, &newavail,
written, 0);
/* Correct the output buffer. */
if (newavail != data->outbufavail && newavail > 0)
{
memmove (data->outbuf,
&data->outbuf[data->outbufavail - newavail],
newavail);
data->outbufavail = newavail;
}
}
}
while (*inbufsize > 0 && result == GCONV_EMPTY_INPUT);
}
if (written != NULL && data->is_last)
*written = do_write;
return result;
}