255 lines
7.0 KiB
C
255 lines
7.0 KiB
C
/*
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* fs/cifs/cifs_unicode.c
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*
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* Copyright (c) International Business Machines Corp., 2000,2009
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* Modified by Steve French (sfrench@us.ibm.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include "cifs_unicode.h"
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#include "cifs_uniupr.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifs_debug.h"
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/*
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* cifs_ucs2_bytes - how long will a string be after conversion?
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* @ucs - pointer to input string
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* @maxbytes - don't go past this many bytes of input string
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* @codepage - destination codepage
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*
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* Walk a ucs2le string and return the number of bytes that the string will
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* be after being converted to the given charset, not including any null
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* termination required. Don't walk past maxbytes in the source buffer.
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*/
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int
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cifs_ucs2_bytes(const __le16 *from, int maxbytes,
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const struct nls_table *codepage)
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{
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int i;
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int charlen, outlen = 0;
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int maxwords = maxbytes / 2;
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char tmp[NLS_MAX_CHARSET_SIZE];
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for (i = 0; i < maxwords && from[i]; i++) {
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charlen = codepage->uni2char(le16_to_cpu(from[i]), tmp,
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NLS_MAX_CHARSET_SIZE);
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if (charlen > 0)
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outlen += charlen;
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else
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outlen++;
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}
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return outlen;
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}
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/*
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* cifs_mapchar - convert a little-endian char to proper char in codepage
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* @target - where converted character should be copied
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* @src_char - 2 byte little-endian source character
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* @cp - codepage to which character should be converted
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* @mapchar - should character be mapped according to mapchars mount option?
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*
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* This function handles the conversion of a single character. It is the
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* responsibility of the caller to ensure that the target buffer is large
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* enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE).
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*/
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static int
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cifs_mapchar(char *target, const __le16 src_char, const struct nls_table *cp,
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bool mapchar)
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{
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int len = 1;
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if (!mapchar)
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goto cp_convert;
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/*
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* BB: Cannot handle remapping UNI_SLASH until all the calls to
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* build_path_from_dentry are modified, as they use slash as
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* separator.
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*/
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switch (le16_to_cpu(src_char)) {
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case UNI_COLON:
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*target = ':';
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break;
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case UNI_ASTERIK:
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*target = '*';
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break;
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case UNI_QUESTION:
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*target = '?';
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break;
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case UNI_PIPE:
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*target = '|';
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break;
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case UNI_GRTRTHAN:
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*target = '>';
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break;
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case UNI_LESSTHAN:
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*target = '<';
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break;
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default:
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goto cp_convert;
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}
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out:
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return len;
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cp_convert:
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len = cp->uni2char(le16_to_cpu(src_char), target,
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NLS_MAX_CHARSET_SIZE);
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if (len <= 0) {
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*target = '?';
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len = 1;
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}
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goto out;
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}
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/*
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* cifs_from_ucs2 - convert utf16le string to local charset
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* @to - destination buffer
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* @from - source buffer
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* @tolen - destination buffer size (in bytes)
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* @fromlen - source buffer size (in bytes)
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* @codepage - codepage to which characters should be converted
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* @mapchar - should characters be remapped according to the mapchars option?
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*
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* Convert a little-endian ucs2le string (as sent by the server) to a string
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* in the provided codepage. The tolen and fromlen parameters are to ensure
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* that the code doesn't walk off of the end of the buffer (which is always
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* a danger if the alignment of the source buffer is off). The destination
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* string is always properly null terminated and fits in the destination
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* buffer. Returns the length of the destination string in bytes (including
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* null terminator).
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*
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* Note that some windows versions actually send multiword UTF-16 characters
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* instead of straight UCS-2. The linux nls routines however aren't able to
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* deal with those characters properly. In the event that we get some of
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* those characters, they won't be translated properly.
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*/
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int
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cifs_from_ucs2(char *to, const __le16 *from, int tolen, int fromlen,
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const struct nls_table *codepage, bool mapchar)
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{
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int i, charlen, safelen;
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int outlen = 0;
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int nullsize = nls_nullsize(codepage);
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int fromwords = fromlen / 2;
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char tmp[NLS_MAX_CHARSET_SIZE];
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/*
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* because the chars can be of varying widths, we need to take care
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* not to overflow the destination buffer when we get close to the
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* end of it. Until we get to this offset, we don't need to check
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* for overflow however.
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*/
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safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize);
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for (i = 0; i < fromwords && from[i]; i++) {
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/*
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* check to see if converting this character might make the
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* conversion bleed into the null terminator
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*/
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if (outlen >= safelen) {
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charlen = cifs_mapchar(tmp, from[i], codepage, mapchar);
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if ((outlen + charlen) > (tolen - nullsize))
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break;
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}
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/* put converted char into 'to' buffer */
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charlen = cifs_mapchar(&to[outlen], from[i], codepage, mapchar);
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outlen += charlen;
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}
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/* properly null-terminate string */
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for (i = 0; i < nullsize; i++)
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to[outlen++] = 0;
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return outlen;
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}
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/*
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* NAME: cifs_strtoUCS()
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*
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* FUNCTION: Convert character string to unicode string
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*
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*/
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int
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cifs_strtoUCS(__le16 *to, const char *from, int len,
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const struct nls_table *codepage)
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{
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int charlen;
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int i;
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wchar_t *wchar_to = (wchar_t *)to; /* needed to quiet sparse */
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for (i = 0; len && *from; i++, from += charlen, len -= charlen) {
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/* works for 2.4.0 kernel or later */
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charlen = codepage->char2uni(from, len, &wchar_to[i]);
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if (charlen < 1) {
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cERROR(1,
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("strtoUCS: char2uni of %d returned %d",
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(int)*from, charlen));
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/* A question mark */
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to[i] = cpu_to_le16(0x003f);
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charlen = 1;
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} else
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to[i] = cpu_to_le16(wchar_to[i]);
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}
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to[i] = 0;
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return i;
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}
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/*
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* cifs_strndup_from_ucs - copy a string from wire format to the local codepage
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* @src - source string
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* @maxlen - don't walk past this many bytes in the source string
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* @is_unicode - is this a unicode string?
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* @codepage - destination codepage
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*
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* Take a string given by the server, convert it to the local codepage and
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* put it in a new buffer. Returns a pointer to the new string or NULL on
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* error.
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*/
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char *
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cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode,
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const struct nls_table *codepage)
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{
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int len;
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char *dst;
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if (is_unicode) {
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len = cifs_ucs2_bytes((__le16 *) src, maxlen, codepage);
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len += nls_nullsize(codepage);
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dst = kmalloc(len, GFP_KERNEL);
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if (!dst)
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return NULL;
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cifs_from_ucs2(dst, (__le16 *) src, len, maxlen, codepage,
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false);
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} else {
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len = strnlen(src, maxlen);
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len++;
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dst = kmalloc(len, GFP_KERNEL);
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if (!dst)
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return NULL;
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strlcpy(dst, src, len);
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}
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return dst;
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}
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