512 lines
11 KiB
C
512 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/udf_fs.h>
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#include "udf_sb.h"
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static int udf_translate_to_linux(uint8_t *, uint8_t *, int, uint8_t *, 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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memset(dest, 0, sizeof(struct ustr));
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usesize= (size > UDF_NAME_LEN) ? UDF_NAME_LEN : size;
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dest->u_cmpID=ptr[0];
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dest->u_len=ptr[size-1];
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memcpy(dest->u_name, ptr+1, usesize-1);
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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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* DESCRIPTION
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* This routine is only called by udf_filldir().
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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, struct ustr *ocu_i)
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{
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uint8_t *ocu;
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uint32_t c;
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uint8_t cmp_id, ocu_len;
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int i;
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ocu = ocu_i->u_name;
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ocu_len = ocu_i->u_len;
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cmp_id = ocu_i->u_cmpID;
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utf_o->u_len = 0;
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if (ocu_len == 0)
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{
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memset(utf_o, 0, sizeof(struct ustr));
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utf_o->u_cmpID = 0;
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utf_o->u_len = 0;
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return 0;
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}
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if ((cmp_id != 8) && (cmp_id != 16))
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{
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printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
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return 0;
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}
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for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
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{
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/* Expand OSTA compressed Unicode to Unicode */
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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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{
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utf_o->u_name[utf_o->u_len++] = (uint8_t)(0xc0 | (c >> 6));
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utf_o->u_name[utf_o->u_len++] = (uint8_t)(0x80 | (c & 0x3f));
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}
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else
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{
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utf_o->u_name[utf_o->u_len++] = (uint8_t)(0xe0 | (c >> 12));
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utf_o->u_name[utf_o->u_len++] = (uint8_t)(0x80 | ((c >> 6) & 0x3f));
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utf_o->u_name[utf_o->u_len++] = (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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{
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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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{
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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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}
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else
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{
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/* Check for a multi-byte UTF-8 character */
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if (c & 0x80U)
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{
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/* Start a multi-byte UTF-8 character */
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if ((c & 0xe0U) == 0xc0U)
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{
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utf_char = c & 0x1fU;
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utf_cnt = 1;
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}
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else if ((c & 0xf0U) == 0xe0U)
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{
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utf_char = c & 0x0fU;
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utf_cnt = 2;
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}
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else if ((c & 0xf8U) == 0xf0U)
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{
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utf_char = c & 0x07U;
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utf_cnt = 3;
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}
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else if ((c & 0xfcU) == 0xf8U)
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{
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utf_char = c & 0x03U;
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utf_cnt = 4;
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}
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else if ((c & 0xfeU) == 0xfcU)
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{
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utf_char = c & 0x01U;
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utf_cnt = 5;
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}
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else
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goto error_out;
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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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/* Choose no compression if necessary */
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if (utf_char > max_val)
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{
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if ( 0xffU == max_val )
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{
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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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{
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ocu[++u_len] = (uint8_t)(utf_char >> 8);
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}
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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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{
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error_out:
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ocu[++u_len] = '?';
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printk(KERN_DEBUG "udf: 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, struct ustr *ocu_i)
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{
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uint8_t *ocu;
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uint32_t c;
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uint8_t cmp_id, ocu_len;
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int i;
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ocu = ocu_i->u_name;
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ocu_len = ocu_i->u_len;
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cmp_id = ocu_i->u_cmpID;
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utf_o->u_len = 0;
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if (ocu_len == 0)
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{
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memset(utf_o, 0, sizeof(struct ustr));
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utf_o->u_cmpID = 0;
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utf_o->u_len = 0;
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return 0;
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}
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if ((cmp_id != 8) && (cmp_id != 16))
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{
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printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
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return 0;
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}
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for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
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{
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/* Expand OSTA compressed Unicode to Unicode */
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c = ocu[i++];
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if (cmp_id == 16)
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c = (c << 8) | ocu[i++];
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utf_o->u_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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}
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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, int length)
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{
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unsigned len, 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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{
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len = nls->char2uni(&uni->u_name[i], uni->u_len-i, &uni_char);
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if (len <= 0)
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continue;
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if (uni_char > max_val)
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{
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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, uint8_t *dname, int flen)
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{
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struct ustr filename, unifilename;
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int len;
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if (udf_build_ustr_exact(&unifilename, sname, flen))
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{
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return 0;
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}
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
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{
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if (!udf_CS0toUTF8(&filename, &unifilename) )
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{
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udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
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return 0;
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}
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}
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else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
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{
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if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, &filename, &unifilename) )
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{
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udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
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return 0;
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}
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}
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else
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return 0;
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if ((len = udf_translate_to_linux(dname, filename.u_name, filename.u_len,
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unifilename.u_name, unifilename.u_len)))
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{
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return len;
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}
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return 0;
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}
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int udf_put_filename(struct super_block *sb, const uint8_t *sname, 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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{
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return 0;
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}
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
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{
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if ( !(namelen = udf_UTF8toCS0(dname, &unifilename, UDF_NAME_LEN)) )
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{
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return 0;
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}
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}
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else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
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{
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if ( !(namelen = udf_NLStoCS0(UDF_SB(sb)->s_nls_map, dname, &unifilename, UDF_NAME_LEN)) )
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{
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return 0;
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}
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}
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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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static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName, int udfLen, 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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const uint8_t hexChar[] = "0123456789ABCDEF";
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if (udfName[0] == '.' && (udfLen == 1 ||
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(udfLen == 2 && udfName[1] == '.')))
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{
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needsCRC = 1;
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newIndex = udfLen;
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memcpy(newName, udfName, udfLen);
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}
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else
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{
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for (index = 0; index < udfLen; index++)
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{
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curr = udfName[index];
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if (curr == '/' || curr == 0)
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{
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needsCRC = 1;
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curr = ILLEGAL_CHAR_MARK;
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while (index+1 < udfLen && (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 && (udfLen - index - 1) <= EXT_SIZE)
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{
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if (udfLen == index + 1)
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hasExt = 0;
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else
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{
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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 < 256)
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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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{
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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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{
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int maxFilenameLen;
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for(index = 0; index<EXT_SIZE && extIndex + index +1 < udfLen;
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index++ )
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{
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curr = udfName[extIndex + index + 1];
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if (curr == '/' || curr == 0)
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{
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needsCRC = 1;
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curr = ILLEGAL_CHAR_MARK;
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while(extIndex + index + 2 < udfLen && (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 = 250 - 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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}
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else if (newIndex > 250)
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newIndex = 250;
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newName[newIndex++] = CRC_MARK;
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valueCRC = udf_crc(fidName, fidNameLen, 0);
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newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];
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newName[newIndex++] = hexChar[(valueCRC & 0x0f00) >> 8];
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newName[newIndex++] = hexChar[(valueCRC & 0x00f0) >> 4];
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newName[newIndex++] = hexChar[(valueCRC & 0x000f)];
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if (hasExt)
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{
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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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