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/* Output stream that converts the output to another encoding.
Copyright (C) 2006-2007, 2010, 2015-2016 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "iconv-ostream.h"
#if HAVE_ICONV
#include <errno.h>
#include <iconv.h>
#include <stdlib.h>
#include <string.h>
#include "c-strcase.h"
#include "error.h"
#include "xalloc.h"
#include "gettext.h"
#define _(str) gettext (str)
#endif /* HAVE_ICONV */
struct iconv_ostream : struct ostream
{
fields:
#if HAVE_ICONV
/* The destination stream. */
ostream_t destination;
/* The from and to encodings. */
char *from_encoding;
char *to_encoding;
/* The converter. */
iconv_t cd;
/* Last few bytes that could not yet be converted. */
#define BUFSIZE 64
char buf[BUFSIZE];
size_t buflen;
#endif /* HAVE_ICONV */
};
#if HAVE_ICONV
/* Implementation of ostream_t methods. */
static void
iconv_ostream::write_mem (iconv_ostream_t stream, const void *data, size_t len)
{
if (len > 0)
{
#define BUFFERSIZE 256
char inbuffer[BUFFERSIZE];
size_t inbufcount;
inbufcount = stream->buflen;
if (inbufcount > 0)
memcpy (inbuffer, stream->buf, inbufcount);
for (;;)
{
/* At this point, inbuffer[0..inbufcount-1] is filled. */
{
/* Combine the previous rest with a chunk of new input. */
size_t n =
(len <= BUFFERSIZE - inbufcount ? len : BUFFERSIZE - inbufcount);
if (n > 0)
{
memcpy (inbuffer + inbufcount, data, n);
data = (char *) data + n;
inbufcount += n;
len -= n;
}
}
{
/* Attempt to convert the combined input. */
char outbuffer[8*BUFFERSIZE];
const char *inptr = inbuffer;
size_t insize = inbufcount;
char *outptr = outbuffer;
size_t outsize = sizeof (outbuffer);
size_t res = iconv (stream->cd,
(ICONV_CONST char **) &inptr, &insize,
&outptr, &outsize);
#if !defined _LIBICONV_VERSION \
&& !(defined __GLIBC__ && !defined __UCLIBC__)
/* Irix iconv() inserts a NUL byte if it cannot convert.
NetBSD iconv() inserts a question mark if it cannot convert.
Only GNU libiconv and GNU libc are known to prefer to fail rather
than doing a lossy conversion. */
if (res > 0)
{
errno = EILSEQ;
res = -1;
}
#endif
if (res == (size_t)(-1) && errno != EINVAL)
error (EXIT_FAILURE, 0, _("%s: cannot convert from %s to %s"),
"iconv_ostream",
stream->from_encoding, stream->to_encoding);
/* Output the converted part. */
if (sizeof (outbuffer) - outsize > 0)
ostream_write_mem (stream->destination,
outbuffer, sizeof (outbuffer) - outsize);
/* Put back the unconverted part. */
if (insize > BUFSIZE)
error (EXIT_FAILURE, 0, _("%s: shift sequence too long"),
"iconv_ostream");
if (len == 0)
{
if (insize > 0)
memcpy (stream->buf, inptr, insize);
stream->buflen = insize;
break;
}
if (insize > 0)
memmove (inbuffer, inptr, insize);
inbufcount = insize;
}
}
#undef BUFFERSIZE
}
}
static void
iconv_ostream::flush (iconv_ostream_t stream)
{
/* There's nothing we can do here, since stream->buf[] contains only a few
bytes that don't correspond to a character. */
}
static void
iconv_ostream::free (iconv_ostream_t stream)
{
/* Silently ignore the few bytes in stream->buf[] that don't correspond to a
character. */
/* Avoid glibc-2.1 bug and Solaris 2.7 bug. */
#if defined _LIBICONV_VERSION \
|| !(((__GLIBC__ - 0 == 2 && __GLIBC_MINOR__ - 0 <= 1) \
&& !defined __UCLIBC__) \
|| defined __sun)
{
char outbuffer[2048];
char *outptr = outbuffer;
size_t outsize = sizeof (outbuffer);
size_t res = iconv (stream->cd, NULL, NULL, &outptr, &outsize);
if (res == (size_t)(-1))
error (EXIT_FAILURE, 0, _("%s: cannot convert from %s to %s"),
"iconv_ostream", stream->from_encoding, stream->to_encoding);
/* Output the converted part. */
if (sizeof (outbuffer) - outsize > 0)
ostream_write_mem (stream->destination,
outbuffer, sizeof (outbuffer) - outsize);
}
#endif
iconv_close (stream->cd);
free (stream->from_encoding);
free (stream->to_encoding);
free (stream);
}
/* Constructor. */
iconv_ostream_t
iconv_ostream_create (const char *from_encoding, const char *to_encoding,
ostream_t destination)
{
iconv_ostream_t stream = XMALLOC (struct iconv_ostream_representation);
stream->base.vtable = &iconv_ostream_vtable;
stream->destination = destination;
stream->from_encoding = xstrdup (from_encoding);
stream->to_encoding = xstrdup (to_encoding);
/* Avoid glibc-2.1 bug with EUC-KR. */
#if ((__GLIBC__ - 0 == 2 && __GLIBC_MINOR__ - 0 <= 1) \
&& !defined __UCLIBC__) \
&& !defined _LIBICONV_VERSION
if (c_strcasecmp (from_encoding, "EUC-KR") == 0
|| c_strcasecmp (to_encoding, "EUC-KR") == 0)
stream->cd = (iconv_t)(-1):
else
#endif
stream->cd = iconv_open (to_encoding, from_encoding);
if (stream->cd == (iconv_t)(-1))
{
if (iconv_open ("UTF-8", from_encoding) == (iconv_t)(-1))
error (EXIT_FAILURE, 0, _("%s does not support conversion from %s"),
"iconv", from_encoding);
else if (iconv_open (to_encoding, "UTF-8") == (iconv_t)(-1))
error (EXIT_FAILURE, 0, _("%s does not support conversion to %s"),
"iconv", to_encoding);
else
error (EXIT_FAILURE, 0,
_("%s does not support conversion from %s to %s"),
"iconv", from_encoding, to_encoding);
}
stream->buflen = 0;
return stream;
}
#else
static void
iconv_ostream::write_mem (iconv_ostream_t stream, const void *data, size_t len)
{
abort ();
}
static void
iconv_ostream::flush (iconv_ostream_t stream)
{
abort ();
}
static void
iconv_ostream::free (iconv_ostream_t stream)
{
abort ();
}
#endif /* HAVE_ICONV */
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