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/* Generic conversion to and from 8bit charsets.
Copyright (C) 1997, 1998 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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 <stdlib.h>
#include <string.h>
/* Direction of the transformation. */
enum direction
{
illegal,
to_8bit,
from_8bit
};
struct s_8bit_data
{
enum direction dir;
};
int
gconv_init (struct gconv_step *step)
{
/* Determine which direction. */
struct s_8bit_data *new_data;
enum direction dir;
int result;
if (strcasestr (step->from_name, NAME) != NULL)
dir = from_8bit;
else if (strcasestr (step->to_name, NAME) != NULL)
dir = to_8bit;
else
dir = illegal;
result = GCONV_NOCONV;
if (dir != illegal
&& ((new_data
= (struct s_8bit_data *) malloc (sizeof (struct s_8bit_data)))
!= NULL))
{
new_data->dir = dir;
step->data = new_data;
result = GCONV_OK;
}
return result;
}
void
gconv_end (struct gconv_step *data)
{
free (data->data);
}
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
{
enum direction dir = ((struct s_8bit_data *) step->data)->dir;
do_write = 0;
do
{
result = GCONV_OK;
if (dir == from_8bit)
{
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))
{
wchar_t ch = to_ucs4[(unsigned int) inbuf[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;
while (inwchars >= cnt + sizeof (wchar_t)
&& outchars < data->outbufsize)
{
int ch = *((wchar_t *) (inbuf + cnt));
if (ch >= sizeof (from_ucs4) / sizeof (from_ucs4[0])
|| ch < 0 || (from_ucs4[ch] == '\0' && ch != 0))
break;
outbuf[outchars] = from_ucs4[ch];
++do_write;
++outchars;
cnt += sizeof (wchar_t);
}
*inbufsize -= cnt;
data->outbufavail = outchars;
if (outchars < 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 > (dir == from_8bit
? 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;
}
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