/* Unix SMB/CIFS implementation. Character set conversion Extensions Copyright (C) Igor Vergeichik 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 . */ #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 * not 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 (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; *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; }