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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;
}
/**
* Convert string from one encoding to another, making error checking etc
*
* @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_ bool convert_string_convenience(struct smb_iconv_convenience *ic,
charset_t from, charset_t to,
void const *src, size_t srclen,
void *dest, size_t destlen, size_t *converted_size,
bool allow_badcharcnv)
{
size_t i_len, o_len;
size_t retval;
const char* inbuf = (const char*)src;
char* outbuf = (char*)dest;
smb_iconv_t descriptor;
if (allow_badcharcnv) {
/* Not implemented yet */
return false;
}
if (srclen == (size_t)-1)
srclen = strlen(inbuf)+1;
descriptor = get_conv_handle(ic, from, to);
if (descriptor == (smb_iconv_t)-1 || descriptor == (smb_iconv_t)0) {
/* conversion not supported, use as is */
size_t len = MIN(srclen,destlen);
memcpy(dest,src,len);
*converted_size = len;
return true;
}
i_len=srclen;
o_len=destlen;
retval = smb_iconv(descriptor, &inbuf, &i_len, &outbuf, &o_len);
if(retval==(size_t)-1) {
const char *reason;
switch(errno) {
case EINVAL:
reason="Incomplete multibyte sequence";
return false;
case E2BIG:
reason="No more room";
if (from == CH_UNIX) {
DEBUG(0,("E2BIG: convert_string(%s,%s): srclen=%d destlen=%d - '%s'\n",
charset_name(ic, from), charset_name(ic, to),
(int)srclen, (int)destlen,
(const char *)src));
} else {
DEBUG(0,("E2BIG: convert_string(%s,%s): srclen=%d destlen=%d\n",
charset_name(ic, from), charset_name(ic, to),
(int)srclen, (int)destlen));
}
return false;
case EILSEQ:
reason="Illegal multibyte sequence";
return false;
}
/* smb_panic(reason); */
}
if (converted_size != NULL)
*converted_size = destlen-o_len;
return true;
}
/**
* Convert between character sets, allocating a new buffer using talloc for the result.
*
* @param srclen length of source buffer.
* @param dest always set at least to NULL
* @note -1 is not accepted for srclen.
*
* @returns Size in bytes of the converted string; or -1 in case of error.
**/
_PUBLIC_ bool convert_string_talloc_convenience(TALLOC_CTX *ctx,
struct smb_iconv_convenience *ic,
charset_t from, charset_t to,
void const *src, size_t srclen,
void *dst, size_t *converted_size,
bool allow_badcharcnv)
{
void **dest = (void **)dst;
smb_iconv_t descriptor;
ssize_t ret;
if (allow_badcharcnv)
return false; /* Not implemented yet */
*dest = NULL;
if (src == NULL || srclen == (size_t)-1 || srclen == 0)
return false;
descriptor = get_conv_handle(ic, from, to);
if (descriptor == (smb_iconv_t)-1 || descriptor == (smb_iconv_t)0) {
/* conversion not supported, return -1*/
DEBUG(3, ("convert_string_talloc: conversion from %s to %s not supported!\n",
charset_name(ic, from),
charset_name(ic, to)));
return false;
}
ret = iconv_talloc(ctx, descriptor, src, srclen, dest);
if (ret == -1)
return false;
if (converted_size != NULL)
*converted_size = ret;
return true;
}
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