397 строки
8.8 KiB
C
397 строки
8.8 KiB
C
/*
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* unicode.c
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*
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* PURPOSE
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* Routines for converting between UTF-8 and OSTA Compressed Unicode.
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* Also handles filename mangling
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*
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* DESCRIPTION
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* OSTA Compressed Unicode is explained in the OSTA UDF specification.
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* http://www.osta.org/
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* UTF-8 is explained in the IETF RFC XXXX.
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* ftp://ftp.internic.net/rfc/rfcxxxx.txt
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*/
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#include "udfdecl.h"
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#include <linux/kernel.h>
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#include <linux/string.h> /* for memset */
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#include <linux/nls.h>
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#include <linux/crc-itu-t.h>
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#include <linux/slab.h>
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#include "udf_sb.h"
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static int udf_uni2char_utf8(wchar_t uni,
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unsigned char *out,
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int boundlen)
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{
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int u_len = 0;
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if (boundlen <= 0)
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return -ENAMETOOLONG;
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if (uni < 0x80) {
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out[u_len++] = (unsigned char)uni;
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} else if (uni < 0x800) {
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if (boundlen < 2)
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return -ENAMETOOLONG;
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out[u_len++] = (unsigned char)(0xc0 | (uni >> 6));
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out[u_len++] = (unsigned char)(0x80 | (uni & 0x3f));
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} else {
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if (boundlen < 3)
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return -ENAMETOOLONG;
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out[u_len++] = (unsigned char)(0xe0 | (uni >> 12));
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out[u_len++] = (unsigned char)(0x80 | ((uni >> 6) & 0x3f));
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out[u_len++] = (unsigned char)(0x80 | (uni & 0x3f));
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}
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return u_len;
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}
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static int udf_char2uni_utf8(const unsigned char *in,
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int boundlen,
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wchar_t *uni)
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{
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unsigned int utf_char;
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unsigned char c;
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int utf_cnt, u_len;
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utf_char = 0;
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utf_cnt = 0;
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for (u_len = 0; u_len < boundlen;) {
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c = in[u_len++];
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/* Complete a multi-byte UTF-8 character */
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if (utf_cnt) {
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utf_char = (utf_char << 6) | (c & 0x3f);
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if (--utf_cnt)
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continue;
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} else {
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/* Check for a multi-byte UTF-8 character */
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if (c & 0x80) {
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/* Start a multi-byte UTF-8 character */
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if ((c & 0xe0) == 0xc0) {
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utf_char = c & 0x1f;
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utf_cnt = 1;
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} else if ((c & 0xf0) == 0xe0) {
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utf_char = c & 0x0f;
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utf_cnt = 2;
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} else if ((c & 0xf8) == 0xf0) {
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utf_char = c & 0x07;
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utf_cnt = 3;
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} else if ((c & 0xfc) == 0xf8) {
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utf_char = c & 0x03;
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utf_cnt = 4;
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} else if ((c & 0xfe) == 0xfc) {
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utf_char = c & 0x01;
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utf_cnt = 5;
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} else {
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utf_cnt = -1;
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break;
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}
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continue;
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} else {
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/* Single byte UTF-8 character (most common) */
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utf_char = c;
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}
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}
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*uni = utf_char;
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break;
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}
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if (utf_cnt) {
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*uni = '?';
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return -EINVAL;
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}
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return u_len;
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}
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#define ILLEGAL_CHAR_MARK '_'
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#define EXT_MARK '.'
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#define CRC_MARK '#'
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#define EXT_SIZE 5
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/* Number of chars we need to store generated CRC to make filename unique */
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#define CRC_LEN 5
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static int udf_name_conv_char(uint8_t *str_o, int str_o_max_len,
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int *str_o_idx,
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const uint8_t *str_i, int str_i_max_len,
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int *str_i_idx,
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int u_ch, int *needsCRC,
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int (*conv_f)(wchar_t, unsigned char *, int),
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int translate)
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{
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uint32_t c;
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int illChar = 0;
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int len, gotch = 0;
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for (; (!gotch) && (*str_i_idx < str_i_max_len); *str_i_idx += u_ch) {
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if (*str_o_idx >= str_o_max_len) {
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*needsCRC = 1;
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return gotch;
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}
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/* Expand OSTA compressed Unicode to Unicode */
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c = str_i[*str_i_idx];
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if (u_ch > 1)
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c = (c << 8) | str_i[*str_i_idx + 1];
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if (translate && (c == '/' || c == 0))
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illChar = 1;
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else if (illChar)
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break;
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else
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gotch = 1;
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}
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if (illChar) {
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*needsCRC = 1;
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c = ILLEGAL_CHAR_MARK;
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gotch = 1;
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}
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if (gotch) {
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len = conv_f(c, &str_o[*str_o_idx], str_o_max_len - *str_o_idx);
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/* Valid character? */
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if (len >= 0)
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*str_o_idx += len;
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else if (len == -ENAMETOOLONG) {
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*needsCRC = 1;
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gotch = 0;
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} else {
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str_o[(*str_o_idx)++] = '?';
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*needsCRC = 1;
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}
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}
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return gotch;
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}
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static int udf_name_from_CS0(uint8_t *str_o, int str_max_len,
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const uint8_t *ocu, int ocu_len,
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int (*conv_f)(wchar_t, unsigned char *, int),
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int translate)
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{
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uint32_t c;
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uint8_t cmp_id;
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int idx, len;
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int u_ch;
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int needsCRC = 0;
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int ext_i_len, ext_max_len;
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int str_o_len = 0; /* Length of resulting output */
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int ext_o_len = 0; /* Extension output length */
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int ext_crc_len = 0; /* Extension output length if used with CRC */
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int i_ext = -1; /* Extension position in input buffer */
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int o_crc = 0; /* Rightmost possible output pos for CRC+ext */
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unsigned short valueCRC;
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uint8_t ext[EXT_SIZE * NLS_MAX_CHARSET_SIZE + 1];
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uint8_t crc[CRC_LEN];
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if (str_max_len <= 0)
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return 0;
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if (ocu_len == 0) {
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memset(str_o, 0, str_max_len);
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return 0;
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}
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cmp_id = ocu[0];
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if (cmp_id != 8 && cmp_id != 16) {
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memset(str_o, 0, str_max_len);
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pr_err("unknown compression code (%d)\n", cmp_id);
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return -EINVAL;
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}
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u_ch = cmp_id >> 3;
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ocu++;
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ocu_len--;
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if (ocu_len % u_ch) {
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pr_err("incorrect filename length (%d)\n", ocu_len + 1);
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return -EINVAL;
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}
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if (translate) {
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/* Look for extension */
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for (idx = ocu_len - u_ch, ext_i_len = 0;
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(idx >= 0) && (ext_i_len < EXT_SIZE);
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idx -= u_ch, ext_i_len++) {
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c = ocu[idx];
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if (u_ch > 1)
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c = (c << 8) | ocu[idx + 1];
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if (c == EXT_MARK) {
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if (ext_i_len)
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i_ext = idx;
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break;
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}
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}
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if (i_ext >= 0) {
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/* Convert extension */
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ext_max_len = min_t(int, sizeof(ext), str_max_len);
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ext[ext_o_len++] = EXT_MARK;
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idx = i_ext + u_ch;
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while (udf_name_conv_char(ext, ext_max_len, &ext_o_len,
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ocu, ocu_len, &idx,
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u_ch, &needsCRC,
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conv_f, translate)) {
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if ((ext_o_len + CRC_LEN) < str_max_len)
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ext_crc_len = ext_o_len;
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}
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}
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}
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idx = 0;
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while (1) {
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if (translate && (idx == i_ext)) {
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if (str_o_len > (str_max_len - ext_o_len))
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needsCRC = 1;
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break;
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}
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if (!udf_name_conv_char(str_o, str_max_len, &str_o_len,
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ocu, ocu_len, &idx,
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u_ch, &needsCRC, conv_f, translate))
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break;
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if (translate &&
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(str_o_len <= (str_max_len - ext_o_len - CRC_LEN)))
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o_crc = str_o_len;
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}
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if (translate) {
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if (str_o_len <= 2 && str_o[0] == '.' &&
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(str_o_len == 1 || str_o[1] == '.'))
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needsCRC = 1;
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if (needsCRC) {
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str_o_len = o_crc;
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valueCRC = crc_itu_t(0, ocu, ocu_len);
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crc[0] = CRC_MARK;
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crc[1] = hex_asc_upper_hi(valueCRC >> 8);
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crc[2] = hex_asc_upper_lo(valueCRC >> 8);
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crc[3] = hex_asc_upper_hi(valueCRC);
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crc[4] = hex_asc_upper_lo(valueCRC);
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len = min_t(int, CRC_LEN, str_max_len - str_o_len);
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memcpy(&str_o[str_o_len], crc, len);
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str_o_len += len;
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ext_o_len = ext_crc_len;
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}
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if (ext_o_len > 0) {
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memcpy(&str_o[str_o_len], ext, ext_o_len);
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str_o_len += ext_o_len;
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}
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}
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return str_o_len;
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}
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static int udf_name_to_CS0(uint8_t *ocu, int ocu_max_len,
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const uint8_t *str_i, int str_len,
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int (*conv_f)(const unsigned char *, int, wchar_t *))
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{
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int i, len;
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unsigned int max_val;
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wchar_t uni_char;
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int u_len, u_ch;
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if (ocu_max_len <= 0)
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return 0;
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memset(ocu, 0, ocu_max_len);
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ocu[0] = 8;
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max_val = 0xff;
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u_ch = 1;
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try_again:
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u_len = 1;
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for (i = 0; i < str_len; i++) {
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/* Name didn't fit? */
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if (u_len + u_ch > ocu_max_len)
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return 0;
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len = conv_f(&str_i[i], str_len - i, &uni_char);
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if (!len)
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continue;
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/* Invalid character, deal with it */
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if (len < 0) {
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len = 1;
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uni_char = '?';
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}
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if (uni_char > max_val) {
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max_val = 0xffff;
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ocu[0] = 0x10;
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u_ch = 2;
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goto try_again;
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}
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if (max_val == 0xffff)
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ocu[u_len++] = (uint8_t)(uni_char >> 8);
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ocu[u_len++] = (uint8_t)(uni_char & 0xff);
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i += len - 1;
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}
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return u_len;
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}
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int udf_dstrCS0toUTF8(uint8_t *utf_o, int o_len,
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const uint8_t *ocu_i, int i_len)
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{
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int s_len = 0;
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if (i_len > 0) {
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s_len = ocu_i[i_len - 1];
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if (s_len >= i_len) {
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pr_err("incorrect dstring lengths (%d/%d)\n",
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s_len, i_len);
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return -EINVAL;
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}
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}
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return udf_name_from_CS0(utf_o, o_len, ocu_i, s_len,
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udf_uni2char_utf8, 0);
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}
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int udf_get_filename(struct super_block *sb, const uint8_t *sname, int slen,
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uint8_t *dname, int dlen)
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{
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int (*conv_f)(wchar_t, unsigned char *, int);
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int ret;
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if (!slen)
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return -EIO;
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if (dlen <= 0)
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return 0;
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
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conv_f = udf_uni2char_utf8;
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} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
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conv_f = UDF_SB(sb)->s_nls_map->uni2char;
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} else
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BUG();
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ret = udf_name_from_CS0(dname, dlen, sname, slen, conv_f, 1);
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/* Zero length filename isn't valid... */
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if (ret == 0)
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ret = -EINVAL;
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return ret;
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}
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int udf_put_filename(struct super_block *sb, const uint8_t *sname, int slen,
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uint8_t *dname, int dlen)
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{
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int (*conv_f)(const unsigned char *, int, wchar_t *);
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
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conv_f = udf_char2uni_utf8;
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} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
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conv_f = UDF_SB(sb)->s_nls_map->char2uni;
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} else
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BUG();
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return udf_name_to_CS0(dname, dlen, sname, slen, conv_f);
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}
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