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/* Conversion to UTF-8 from legacy encodings.
Copyright (C) 2002, 2006-2007, 2009-2024 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>. */
#include <config.h>
/* Specification. */
#include "uniconv.h"
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "c-strcaseeq.h"
#include "striconveha.h"
#include "unistr.h"
uint8_t *
u8_conv_from_encoding (const char *fromcode,
enum iconv_ilseq_handler handler,
const char *src, size_t srclen,
size_t *offsets,
uint8_t *resultbuf, size_t *lengthp)
{
if (STRCASEEQ (fromcode, "UTF-8", 'U','T','F','-','8',0,0,0,0))
{
/* Conversion from UTF-8 to UTF-8. No need to go through iconv(). */
uint8_t *result;
if (u8_check ((const uint8_t *) src, srclen))
{
errno = EILSEQ;
return NULL;
}
if (offsets != NULL)
{
size_t i;
for (i = 0; i < srclen; )
{
int count = u8_mblen ((const uint8_t *) src + i, srclen - i);
/* We can rely on count > 0 because of the previous u8_check. */
if (count <= 0)
abort ();
offsets[i] = i;
i++;
while (--count > 0)
offsets[i++] = (size_t)(-1);
}
}
/* Memory allocation. */
if (resultbuf != NULL && *lengthp >= srclen)
result = resultbuf;
else
{
result = (uint8_t *) malloc (srclen > 0 ? srclen : 1);
if (result == NULL)
{
errno = ENOMEM;
return NULL;
}
}
if (srclen > 0)
memcpy ((char *) result, src, srclen);
*lengthp = srclen;
return result;
}
else
{
char *result = (char *) resultbuf;
size_t length = *lengthp;
if (mem_iconveha (src, srclen, fromcode, "UTF-8", true, handler,
offsets, &result, &length) < 0)
return NULL;
if (result == NULL) /* when (resultbuf == NULL && length == 0) */
{
result = (char *) malloc (1);
if (result == NULL)
{
errno = ENOMEM;
return NULL;
}
}
*lengthp = length;
return (uint8_t *) result;
}
}
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