497 lines
11 KiB
C
497 lines
11 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_translate_to_linux(uint8_t *, int, uint8_t *, int, uint8_t *,
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int);
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static int udf_char_to_ustr(struct ustr *dest, const uint8_t *src, int strlen)
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{
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if ((!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN - 2))
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return 0;
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memset(dest, 0, sizeof(struct ustr));
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memcpy(dest->u_name, src, strlen);
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dest->u_cmpID = 0x08;
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dest->u_len = strlen;
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return strlen;
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}
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/*
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* udf_build_ustr
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*/
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int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
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{
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int usesize;
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if (!dest || !ptr || !size)
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return -1;
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BUG_ON(size < 2);
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usesize = min_t(size_t, ptr[size - 1], sizeof(dest->u_name));
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usesize = min(usesize, size - 2);
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dest->u_cmpID = ptr[0];
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dest->u_len = usesize;
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memcpy(dest->u_name, ptr + 1, usesize);
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memset(dest->u_name + usesize, 0, sizeof(dest->u_name) - usesize);
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return 0;
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}
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/*
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* udf_build_ustr_exact
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*/
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static int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
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{
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if ((!dest) || (!ptr) || (!exactsize))
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return -1;
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memset(dest, 0, sizeof(struct ustr));
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dest->u_cmpID = ptr[0];
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dest->u_len = exactsize - 1;
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memcpy(dest->u_name, ptr + 1, exactsize - 1);
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return 0;
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}
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/*
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* udf_ocu_to_utf8
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*
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* PURPOSE
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* Convert OSTA Compressed Unicode to the UTF-8 equivalent.
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*
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* PRE-CONDITIONS
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* utf Pointer to UTF-8 output buffer.
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* ocu Pointer to OSTA Compressed Unicode input buffer
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* of size UDF_NAME_LEN bytes.
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* both of type "struct ustr *"
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*
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* POST-CONDITIONS
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* <return> Zero on success.
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*
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* HISTORY
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* November 12, 1997 - Andrew E. Mileski
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* Written, tested, and released.
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*/
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int udf_CS0toUTF8(struct ustr *utf_o, const struct ustr *ocu_i)
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{
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const uint8_t *ocu;
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uint8_t cmp_id, ocu_len;
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int i;
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ocu_len = ocu_i->u_len;
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if (ocu_len == 0) {
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memset(utf_o, 0, sizeof(struct ustr));
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return 0;
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}
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cmp_id = ocu_i->u_cmpID;
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if (cmp_id != 8 && cmp_id != 16) {
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memset(utf_o, 0, sizeof(struct ustr));
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pr_err("unknown compression code (%d) stri=%s\n",
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cmp_id, ocu_i->u_name);
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return 0;
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}
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ocu = ocu_i->u_name;
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utf_o->u_len = 0;
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for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
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/* Expand OSTA compressed Unicode to Unicode */
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uint32_t c = ocu[i++];
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if (cmp_id == 16)
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c = (c << 8) | ocu[i++];
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/* Compress Unicode to UTF-8 */
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if (c < 0x80U)
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utf_o->u_name[utf_o->u_len++] = (uint8_t)c;
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else if (c < 0x800U) {
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utf_o->u_name[utf_o->u_len++] =
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(uint8_t)(0xc0 | (c >> 6));
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utf_o->u_name[utf_o->u_len++] =
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(uint8_t)(0x80 | (c & 0x3f));
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} else {
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utf_o->u_name[utf_o->u_len++] =
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(uint8_t)(0xe0 | (c >> 12));
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utf_o->u_name[utf_o->u_len++] =
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(uint8_t)(0x80 |
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((c >> 6) & 0x3f));
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utf_o->u_name[utf_o->u_len++] =
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(uint8_t)(0x80 | (c & 0x3f));
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}
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}
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utf_o->u_cmpID = 8;
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return utf_o->u_len;
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}
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/*
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*
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* udf_utf8_to_ocu
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*
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* PURPOSE
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* Convert UTF-8 to the OSTA Compressed Unicode equivalent.
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*
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* DESCRIPTION
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* This routine is only called by udf_lookup().
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*
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* PRE-CONDITIONS
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* ocu Pointer to OSTA Compressed Unicode output
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* buffer of size UDF_NAME_LEN bytes.
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* utf Pointer to UTF-8 input buffer.
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* utf_len Length of UTF-8 input buffer in bytes.
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*
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* POST-CONDITIONS
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* <return> Zero on success.
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*
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* HISTORY
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* November 12, 1997 - Andrew E. Mileski
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* Written, tested, and released.
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*/
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static int udf_UTF8toCS0(dstring *ocu, struct ustr *utf, int length)
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{
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unsigned c, i, max_val, utf_char;
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int utf_cnt, u_len;
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memset(ocu, 0, sizeof(dstring) * length);
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ocu[0] = 8;
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max_val = 0xffU;
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try_again:
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u_len = 0U;
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utf_char = 0U;
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utf_cnt = 0U;
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for (i = 0U; i < utf->u_len; i++) {
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c = (uint8_t)utf->u_name[i];
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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 & 0x3fU);
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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 & 0x80U) {
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/* Start a multi-byte UTF-8 character */
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if ((c & 0xe0U) == 0xc0U) {
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utf_char = c & 0x1fU;
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utf_cnt = 1;
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} else if ((c & 0xf0U) == 0xe0U) {
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utf_char = c & 0x0fU;
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utf_cnt = 2;
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} else if ((c & 0xf8U) == 0xf0U) {
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utf_char = c & 0x07U;
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utf_cnt = 3;
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} else if ((c & 0xfcU) == 0xf8U) {
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utf_char = c & 0x03U;
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utf_cnt = 4;
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} else if ((c & 0xfeU) == 0xfcU) {
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utf_char = c & 0x01U;
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utf_cnt = 5;
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} else {
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goto error_out;
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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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/* Choose no compression if necessary */
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if (utf_char > max_val) {
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if (max_val == 0xffU) {
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max_val = 0xffffU;
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ocu[0] = (uint8_t)0x10U;
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goto try_again;
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}
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goto error_out;
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}
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if (max_val == 0xffffU)
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ocu[++u_len] = (uint8_t)(utf_char >> 8);
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ocu[++u_len] = (uint8_t)(utf_char & 0xffU);
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}
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if (utf_cnt) {
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error_out:
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ocu[++u_len] = '?';
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printk(KERN_DEBUG pr_fmt("bad UTF-8 character\n"));
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}
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ocu[length - 1] = (uint8_t)u_len + 1;
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return u_len + 1;
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}
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static int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o,
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const struct ustr *ocu_i)
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{
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const uint8_t *ocu;
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uint8_t cmp_id, ocu_len;
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int i, len;
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ocu_len = ocu_i->u_len;
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if (ocu_len == 0) {
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memset(utf_o, 0, sizeof(struct ustr));
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return 0;
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}
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cmp_id = ocu_i->u_cmpID;
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if (cmp_id != 8 && cmp_id != 16) {
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memset(utf_o, 0, sizeof(struct ustr));
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pr_err("unknown compression code (%d) stri=%s\n",
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cmp_id, ocu_i->u_name);
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return 0;
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}
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ocu = ocu_i->u_name;
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utf_o->u_len = 0;
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for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN - 3));) {
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/* Expand OSTA compressed Unicode to Unicode */
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uint32_t c = ocu[i++];
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if (cmp_id == 16)
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c = (c << 8) | ocu[i++];
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len = nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
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UDF_NAME_LEN - utf_o->u_len);
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/* Valid character? */
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if (len >= 0)
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utf_o->u_len += len;
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else
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utf_o->u_name[utf_o->u_len++] = '?';
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}
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utf_o->u_cmpID = 8;
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return utf_o->u_len;
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}
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static int udf_NLStoCS0(struct nls_table *nls, dstring *ocu, struct ustr *uni,
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int length)
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{
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int len;
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unsigned i, max_val;
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uint16_t uni_char;
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int u_len;
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memset(ocu, 0, sizeof(dstring) * length);
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ocu[0] = 8;
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max_val = 0xffU;
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try_again:
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u_len = 0U;
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for (i = 0U; i < uni->u_len; i++) {
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len = nls->char2uni(&uni->u_name[i], uni->u_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 = 0xffffU;
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ocu[0] = (uint8_t)0x10U;
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goto try_again;
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}
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if (max_val == 0xffffU)
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ocu[++u_len] = (uint8_t)(uni_char >> 8);
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ocu[++u_len] = (uint8_t)(uni_char & 0xffU);
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i += len - 1;
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}
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ocu[length - 1] = (uint8_t)u_len + 1;
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return u_len + 1;
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}
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int udf_get_filename(struct super_block *sb, uint8_t *sname, int slen,
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uint8_t *dname, int dlen)
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{
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struct ustr *filename, *unifilename;
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int len = 0;
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filename = kmalloc(sizeof(struct ustr), GFP_NOFS);
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if (!filename)
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return 0;
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unifilename = kmalloc(sizeof(struct ustr), GFP_NOFS);
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if (!unifilename)
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goto out1;
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if (udf_build_ustr_exact(unifilename, sname, slen))
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goto out2;
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
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if (!udf_CS0toUTF8(filename, unifilename)) {
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udf_debug("Failed in udf_get_filename: sname = %s\n",
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sname);
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goto out2;
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}
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} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
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if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, filename,
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unifilename)) {
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udf_debug("Failed in udf_get_filename: sname = %s\n",
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sname);
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goto out2;
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}
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} else
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goto out2;
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len = udf_translate_to_linux(dname, dlen,
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filename->u_name, filename->u_len,
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unifilename->u_name, unifilename->u_len);
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out2:
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kfree(unifilename);
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out1:
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kfree(filename);
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return len;
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}
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int udf_put_filename(struct super_block *sb, const uint8_t *sname,
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uint8_t *dname, int flen)
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{
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struct ustr unifilename;
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int namelen;
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if (!udf_char_to_ustr(&unifilename, sname, flen))
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return 0;
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) {
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namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN);
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if (!namelen)
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return 0;
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} else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) {
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namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname,
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&unifilename, UDF_NAME_LEN);
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if (!namelen)
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return 0;
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} else
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return 0;
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return namelen;
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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_translate_to_linux(uint8_t *newName, int newLen,
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uint8_t *udfName, int udfLen,
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uint8_t *fidName, int fidNameLen)
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{
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int index, newIndex = 0, needsCRC = 0;
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int extIndex = 0, newExtIndex = 0, hasExt = 0;
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unsigned short valueCRC;
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uint8_t curr;
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if (udfName[0] == '.' &&
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(udfLen == 1 || (udfLen == 2 && udfName[1] == '.'))) {
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needsCRC = 1;
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newIndex = udfLen;
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memcpy(newName, udfName, udfLen);
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} else {
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for (index = 0; index < udfLen; index++) {
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curr = udfName[index];
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if (curr == '/' || curr == 0) {
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needsCRC = 1;
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curr = ILLEGAL_CHAR_MARK;
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while (index + 1 < udfLen &&
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(udfName[index + 1] == '/' ||
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udfName[index + 1] == 0))
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index++;
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}
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if (curr == EXT_MARK &&
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(udfLen - index - 1) <= EXT_SIZE) {
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if (udfLen == index + 1)
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hasExt = 0;
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else {
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hasExt = 1;
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extIndex = index;
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newExtIndex = newIndex;
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}
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}
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if (newIndex < newLen)
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newName[newIndex++] = curr;
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else
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needsCRC = 1;
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}
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}
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if (needsCRC) {
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uint8_t ext[EXT_SIZE];
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int localExtIndex = 0;
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if (hasExt) {
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int maxFilenameLen;
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for (index = 0;
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index < EXT_SIZE && extIndex + index + 1 < udfLen;
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index++) {
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curr = udfName[extIndex + index + 1];
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if (curr == '/' || curr == 0) {
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needsCRC = 1;
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curr = ILLEGAL_CHAR_MARK;
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while (extIndex + index + 2 < udfLen &&
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(index + 1 < EXT_SIZE &&
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(udfName[extIndex + index + 2] == '/' ||
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udfName[extIndex + index + 2] == 0)))
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index++;
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}
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ext[localExtIndex++] = curr;
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}
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maxFilenameLen = newLen - CRC_LEN - localExtIndex;
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if (newIndex > maxFilenameLen)
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newIndex = maxFilenameLen;
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else
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newIndex = newExtIndex;
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} else if (newIndex > newLen - CRC_LEN)
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newIndex = newLen - CRC_LEN;
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newName[newIndex++] = CRC_MARK;
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valueCRC = crc_itu_t(0, fidName, fidNameLen);
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newName[newIndex++] = hex_asc_upper_hi(valueCRC >> 8);
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newName[newIndex++] = hex_asc_upper_lo(valueCRC >> 8);
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newName[newIndex++] = hex_asc_upper_hi(valueCRC);
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newName[newIndex++] = hex_asc_upper_lo(valueCRC);
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if (hasExt) {
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newName[newIndex++] = EXT_MARK;
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for (index = 0; index < localExtIndex; index++)
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newName[newIndex++] = ext[index];
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}
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}
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return newIndex;
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}
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