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/*
* unicode.c
*
* PURPOSE
* Routines for converting between UTF-8 and OSTA Compressed Unicode.
* Also handles filename mangling
*
* DESCRIPTION
* OSTA Compressed Unicode is explained in the OSTA UDF specification.
* http://www.osta.org/
* UTF-8 is explained in the IETF RFC XXXX.
* ftp://ftp.internic.net/rfc/rfcxxxx.txt
*
* CONTACTS
* E-mail regarding any portion of the Linux UDF file system should be
* directed to the development team's mailing list (run by majordomo):
* linux_udf@hpesjro.fc.hp.com
*
* COPYRIGHT
* This file is distributed under the terms of the GNU General Public
* License (GPL). Copies of the GPL can be obtained from:
* ftp://prep.ai.mit.edu/pub/gnu/GPL
* Each contributing author retains all rights to their own work.
*/
#ifdef __KERNEL__
#include <linux/kernel.h>
#include <linux/string.h> /* for memset */
#include <linux/nls.h>
#include <linux/udf_fs.h>
#include "udf_sb.h"
#else
#include <string.h>
#endif
#include "udfdecl.h"
int udf_ustr_to_dchars(Uint8 *dest, const struct ustr *src, int strlen)
{
if ( (!dest) || (!src) || (!strlen) || (src->u_len > strlen) )
return 0;
memcpy(dest+1, src->u_name, src->u_len);
dest[0] = src->u_cmpID;
return src->u_len + 1;
}
int udf_ustr_to_char(Uint8 *dest, const struct ustr *src, int strlen)
{
if ( (!dest) || (!src) || (!strlen) || (src->u_len >= strlen) )
return 0;
memcpy(dest, src->u_name, src->u_len);
return src->u_len;
}
int udf_ustr_to_dstring(dstring *dest, const struct ustr *src, int dlength)
{
if ( udf_ustr_to_dchars(dest, src, dlength-1) )
{
dest[dlength-1] = src->u_len + 1;
return dlength;
}
else
return 0;
}
int udf_dchars_to_ustr(struct ustr *dest, const Uint8 *src, int strlen)
{
if ( (!dest) || (!src) || (!strlen) || (strlen > UDF_NAME_LEN) )
return 0;
memset(dest, 0, sizeof(struct ustr));
memcpy(dest->u_name, src+1, strlen-1);
dest->u_cmpID = src[0];
dest->u_len = strlen-1;
return strlen-1;
}
int udf_char_to_ustr(struct ustr *dest, const Uint8 *src, int strlen)
{
if ( (!dest) || (!src) || (!strlen) || (strlen >= UDF_NAME_LEN) )
return 0;
memset(dest, 0, sizeof(struct ustr));
memcpy(dest->u_name, src, strlen);
dest->u_cmpID = 0x08;
dest->u_len = strlen;
return strlen;
}
int udf_dstring_to_ustr(struct ustr *dest, const dstring *src, int dlength)
{
if ( dlength && udf_dchars_to_ustr(dest, src, src[dlength-1]) )
return dlength;
else
return 0;
}
/*
* udf_build_ustr
*/
int udf_build_ustr(struct ustr *dest, dstring *ptr, int size)
{
int usesize;
if ( (!dest) || (!ptr) || (!size) )
return -1;
memset(dest, 0, sizeof(struct ustr));
usesize= (size > UDF_NAME_LEN) ? UDF_NAME_LEN : size;
dest->u_cmpID=ptr[0];
dest->u_len=ptr[size-1];
memcpy(dest->u_name, ptr+1, usesize-1);
return 0;
}
/*
* udf_build_ustr_exact
*/
int udf_build_ustr_exact(struct ustr *dest, dstring *ptr, int exactsize)
{
if ( (!dest) || (!ptr) || (!exactsize) )
return -1;
memset(dest, 0, sizeof(struct ustr));
dest->u_cmpID=ptr[0];
dest->u_len=exactsize-1;
memcpy(dest->u_name, ptr+1, exactsize-1);
return 0;
}
/*
* udf_ocu_to_utf8
*
* PURPOSE
* Convert OSTA Compressed Unicode to the UTF-8 equivalent.
*
* DESCRIPTION
* This routine is only called by udf_filldir().
*
* PRE-CONDITIONS
* utf Pointer to UTF-8 output buffer.
* ocu Pointer to OSTA Compressed Unicode input buffer
* of size UDF_NAME_LEN bytes.
* both of type "struct ustr *"
*
* POST-CONDITIONS
* <return> Zero on success.
*
* HISTORY
* November 12, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
int udf_CS0toUTF8(struct ustr *utf_o, struct ustr *ocu_i)
{
Uint8 *ocu;
Uint32 c;
Uint8 cmp_id, ocu_len;
int i;
ocu = ocu_i->u_name;
ocu_len = ocu_i->u_len;
cmp_id = ocu_i->u_cmpID;
utf_o->u_len = 0;
if (ocu_len == 0)
{
memset(utf_o, 0, sizeof(struct ustr));
utf_o->u_cmpID = 0;
utf_o->u_len = 0;
return 0;
}
if ((cmp_id != 8) && (cmp_id != 16))
{
#ifdef __KERNEL__
printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
#endif
return 0;
}
for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
{
/* Expand OSTA compressed Unicode to Unicode */
c = ocu[i++];
if (cmp_id == 16)
c = (c << 8) | ocu[i++];
/* Compress Unicode to UTF-8 */
if (c < 0x80U)
utf_o->u_name[utf_o->u_len++] = (Uint8)c;
else if (c < 0x800U)
{
utf_o->u_name[utf_o->u_len++] = (Uint8)(0xc0 | (c >> 6));
utf_o->u_name[utf_o->u_len++] = (Uint8)(0x80 | (c & 0x3f));
}
else
{
utf_o->u_name[utf_o->u_len++] = (Uint8)(0xe0 | (c >> 12));
utf_o->u_name[utf_o->u_len++] = (Uint8)(0x80 | ((c >> 6) & 0x3f));
utf_o->u_name[utf_o->u_len++] = (Uint8)(0x80 | (c & 0x3f));
}
}
utf_o->u_cmpID=8;
utf_o->u_hash=0L;
utf_o->padding=0;
return utf_o->u_len;
}
/*
*
* udf_utf8_to_ocu
*
* PURPOSE
* Convert UTF-8 to the OSTA Compressed Unicode equivalent.
*
* DESCRIPTION
* This routine is only called by udf_lookup().
*
* PRE-CONDITIONS
* ocu Pointer to OSTA Compressed Unicode output
* buffer of size UDF_NAME_LEN bytes.
* utf Pointer to UTF-8 input buffer.
* utf_len Length of UTF-8 input buffer in bytes.
*
* POST-CONDITIONS
* <return> Zero on success.
*
* HISTORY
* November 12, 1997 - Andrew E. Mileski
* Written, tested, and released.
*/
int udf_UTF8toCS0(dstring *ocu, struct ustr *utf, int length)
{
unsigned c, i, max_val, utf_char;
int utf_cnt;
int u_len = 0;
memset(ocu, 0, sizeof(dstring) * length);
ocu[0] = 8;
max_val = 0xffU;
try_again:
utf_char = 0U;
utf_cnt = 0U;
for (i = 0U; i < utf->u_len; i++)
{
c = (Uint8)utf->u_name[i];
/* Complete a multi-byte UTF-8 character */
if (utf_cnt)
{
utf_char = (utf_char << 6) | (c & 0x3fU);
if (--utf_cnt)
continue;
}
else
{
/* Check for a multi-byte UTF-8 character */
if (c & 0x80U)
{
/* Start a multi-byte UTF-8 character */
if ((c & 0xe0U) == 0xc0U)
{
utf_char = c & 0x1fU;
utf_cnt = 1;
}
else if ((c & 0xf0U) == 0xe0U)
{
utf_char = c & 0x0fU;
utf_cnt = 2;
}
else if ((c & 0xf8U) == 0xf0U)
{
utf_char = c & 0x07U;
utf_cnt = 3;
}
else if ((c & 0xfcU) == 0xf8U)
{
utf_char = c & 0x03U;
utf_cnt = 4;
}
else if ((c & 0xfeU) == 0xfcU)
{
utf_char = c & 0x01U;
utf_cnt = 5;
}
else
goto error_out;
continue;
} else
/* Single byte UTF-8 character (most common) */
utf_char = c;
}
/* Choose no compression if necessary */
if (utf_char > max_val)
{
if ( 0xffU == max_val )
{
max_val = 0xffffU;
ocu[0] = (Uint8)0x10U;
goto try_again;
}
goto error_out;
}
if (max_val == 0xffffU)
{
ocu[++u_len] = (Uint8)(utf_char >> 8);
}
ocu[++u_len] = (Uint8)(utf_char & 0xffU);
}
if (utf_cnt)
{
error_out:
#ifdef __KERNEL__
printk(KERN_ERR "udf: bad UTF-8 character\n");
#endif
return 0;
}
ocu[length - 1] = (Uint8)u_len + 1;
return u_len + 1;
}
#ifdef __KERNEL__
int udf_CS0toNLS(struct nls_table *nls, struct ustr *utf_o, struct ustr *ocu_i)
{
Uint8 *ocu;
Uint32 c;
Uint8 cmp_id, ocu_len;
int i;
ocu = ocu_i->u_name;
ocu_len = ocu_i->u_len;
cmp_id = ocu_i->u_cmpID;
utf_o->u_len = 0;
if (ocu_len == 0)
{
memset(utf_o, 0, sizeof(struct ustr));
utf_o->u_cmpID = 0;
utf_o->u_len = 0;
return 0;
}
if ((cmp_id != 8) && (cmp_id != 16))
{
printk(KERN_ERR "udf: unknown compression code (%d) stri=%s\n", cmp_id, ocu_i->u_name);
return 0;
}
for (i = 0; (i < ocu_len) && (utf_o->u_len <= (UDF_NAME_LEN-3)) ;)
{
/* Expand OSTA compressed Unicode to Unicode */
c = ocu[i++];
if (cmp_id == 16)
c = (c << 8) | ocu[i++];
utf_o->u_len += nls->uni2char(c, &utf_o->u_name[utf_o->u_len],
UDF_NAME_LEN - utf_o->u_len);
}
utf_o->u_cmpID=8;
utf_o->u_hash=0L;
utf_o->padding=0;
return utf_o->u_len;
}
int udf_NLStoCS0(struct nls_table *nls, dstring *ocu, struct ustr *uni, int length)
{
unsigned len, i, max_val;
Uint16 uni_char;
int uni_cnt;
int u_len = 0;
memset(ocu, 0, sizeof(dstring) * length);
ocu[0] = 8;
max_val = 0xffU;
try_again:
uni_char = 0U;
uni_cnt = 0U;
for (i = 0U; i < uni->u_len; i++)
{
len = nls->char2uni(&uni->u_name[i], uni->u_len-i, &uni_char);
if (len == 2 && max_val == 0xff)
{
max_val = 0xffffU;
ocu[0] = (Uint8)0x10U;
goto try_again;
}
if (max_val == 0xffffU)
{
ocu[++u_len] = (Uint8)(uni_char >> 8);
i++;
}
ocu[++u_len] = (Uint8)(uni_char & 0xffU);
}
ocu[length - 1] = (Uint8)u_len + 1;
return u_len + 1;
}
int udf_get_filename(struct super_block *sb, Uint8 *sname, Uint8 *dname, int flen)
{
struct ustr filename, unifilename;
int len;
if (udf_build_ustr_exact(&unifilename, sname, flen))
{
return 0;
}
if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8))
{
if (!udf_CS0toUTF8(&filename, &unifilename) )
{
udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
return 0;
}
}
else if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
{
if (!udf_CS0toNLS(UDF_SB(sb)->s_nls_map, &filename, &unifilename) )
{
udf_debug("Failed in udf_get_filename: sname = %s\n", sname);
return 0;
}
}
else
return 0;
if ((len = udf_translate_to_linux(dname, filename.u_name, filename.u_len,
unifilename.u_name, unifilename.u_len)))
{
return len;
}
return 0;
}
#endif
#define ILLEGAL_CHAR_MARK '_'
#define EXT_MARK '.'
#define CRC_MARK '#'
#define EXT_SIZE 5
int udf_translate_to_linux(Uint8 *newName, Uint8 *udfName, int udfLen, Uint8 *fidName, int fidNameLen)
{
int index, newIndex = 0, needsCRC = 0;
int extIndex = 0, newExtIndex = 0, hasExt = 0;
unsigned short valueCRC;
Uint8 curr;
const Uint8 hexChar[] = "0123456789ABCDEF";
if (udfName[0] == '.' && (udfLen == 1 ||
(udfLen == 2 && udfName[1] == '.')))
{
needsCRC = 1;
newIndex = udfLen;
memcpy(newName, udfName, udfLen);
}
else
{
for (index = 0; index < udfLen; index++)
{
curr = udfName[index];
if (curr == '/' || curr == 0)
{
needsCRC = 1;
curr = ILLEGAL_CHAR_MARK;
while (index+1 < udfLen && (udfName[index+1] == '/' ||
udfName[index+1] == 0))
index++;
}
if (curr == EXT_MARK && (udfLen - index - 1) <= EXT_SIZE)
{
if (udfLen == index + 1)
hasExt = 0;
else
{
hasExt = 1;
extIndex = index;
newExtIndex = newIndex;
}
}
if (newIndex < 256)
newName[newIndex++] = curr;
else
needsCRC = 1;
}
}
if (needsCRC)
{
Uint8 ext[EXT_SIZE];
int localExtIndex = 0;
if (hasExt)
{
int maxFilenameLen;
for(index = 0; index<EXT_SIZE && extIndex + index +1 < udfLen;
index++ )
{
curr = udfName[extIndex + index + 1];
if (curr == '/' || curr == 0)
{
needsCRC = 1;
curr = ILLEGAL_CHAR_MARK;
while(extIndex + index + 2 < udfLen && (index + 1 < EXT_SIZE
&& (udfName[extIndex + index + 2] == '/' ||
udfName[extIndex + index + 2] == 0)))
index++;
}
ext[localExtIndex++] = curr;
}
maxFilenameLen = 250 - localExtIndex;
if (newIndex > maxFilenameLen)
newIndex = maxFilenameLen;
else
newIndex = newExtIndex;
}
else if (newIndex > 250)
newIndex = 250;
newName[newIndex++] = CRC_MARK;
valueCRC = udf_crc(fidName, fidNameLen, 0);
newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];
newName[newIndex++] = hexChar[(valueCRC & 0x0f00) >> 8];
newName[newIndex++] = hexChar[(valueCRC & 0x00f0) >> 4];
newName[newIndex++] = hexChar[(valueCRC & 0x000f)];
if (hasExt)
{
newName[newIndex++] = EXT_MARK;
for (index = 0;index < localExtIndex ;index++ )
newName[newIndex++] = ext[index];
}
}
return newIndex;
}
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