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/*
Unix SMB/CIFS implementation.
Character set conversion Extensions
Copyright (C) Igor Vergeichik <iverg@mail.ru> 2001
Copyright (C) Andrew Tridgell 2001
Copyright (C) Simo Sorce 2001
Copyright (C) Jelmer Vernooij 2007
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 "includes.h"
#include "system/iconv.h"
/**
* @file
*
* @brief Character-set conversion routines built on our iconv.
*
* @note Samba's internal character set (at least in the 3.0 series)
* is always the same as the one for the Unix filesystem. It is
* <b>not</b> necessarily UTF-8 and may be different on machines that
* need i18n filenames to be compatible with Unix software. It does
* have to be a superset of ASCII. All multibyte sequences must start
* with a byte with the high bit set.
*
* @sa lib/iconv.c
*/
/**
* Convert string from one encoding to another, making error checking etc
*
* @param mem_ctx Memory context
* @param cd Iconv handle
* @param src pointer to source string (multibyte or singlebyte)
* @param srclen length of the source string in bytes
* @param dest pointer to destination string (multibyte or singlebyte)
* @param destlen maximal length allowed for string
* @returns the number of bytes occupied in the destination
**/
_PUBLIC_ ssize_t iconv_talloc(TALLOC_CTX *ctx,
smb_iconv_t cd,
void const *src, size_t srclen,
void *dst)
{
size_t i_len, o_len, destlen;
void **dest = (void **)dst;
size_t retval;
const char *inbuf = (const char *)src;
char *outbuf, *ob;
*dest = NULL;
/* it is _very_ rare that a conversion increases the size by
more than 3x */
destlen = srclen;
outbuf = NULL;
convert:
destlen = 2 + (destlen*3);
ob = talloc_realloc(ctx, outbuf, char, destlen);
if (!ob) {
DEBUG(0, ("iconv_talloc: realloc failed!\n"));
talloc_free(outbuf);
return (size_t)-1;
} else {
outbuf = ob;
}
/* we give iconv 2 less bytes to allow us to terminate at the
end */
i_len = srclen;
o_len = destlen-2;
retval = smb_iconv(cd,
&inbuf, &i_len,
&outbuf, &o_len);
if(retval == (size_t)-1) {
const char *reason="unknown error";
switch(errno) {
case EINVAL:
reason="Incomplete multibyte sequence";
break;
case E2BIG:
goto convert;
case EILSEQ:
reason="Illegal multibyte sequence";
break;
}
DEBUG(0,("Conversion error: %s - ",reason));
dump_data(0, (const uint8_t *) inbuf, i_len);
talloc_free(ob);
return (size_t)-1;
}
destlen = (destlen-2) - o_len;
/* guarantee null termination in all charsets */
SSVAL(ob, destlen, 0);
*dest = ob;
return destlen;
}
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