mirror of https://gitee.com/openkylin/linux.git
udf: use crc_itu_t from lib instead of udf_crc
As pointed out by Sergey Vlasov, UDF implements its own version of the CRC ITU-T V.41. Convert it to use the one in the library. Signed-off-by: Bob Copeland <me@bobcopeland.com> Cc: Sergey Vlasov <vsu@altlinux.ru> Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Bob Copeland
Jan Kara
parent
706047a797
commit
f845fced91
|
|
@ -663,6 +663,7 @@ config ZISOFS
|
|||
|
||||
config UDF_FS
|
||||
tristate "UDF file system support"
|
||||
select CRC_ITU_T
|
||||
help
|
||||
This is the new file system used on some CD-ROMs and DVDs. Say Y if
|
||||
you intend to mount DVD discs or CDRW's written in packet mode, or
|
||||
|
|
|
|||
|
|
@ -6,4 +6,4 @@ obj-$(CONFIG_UDF_FS) += udf.o
|
|||
|
||||
udf-objs := balloc.o dir.o file.o ialloc.o inode.o lowlevel.o namei.o \
|
||||
partition.o super.o truncate.o symlink.o fsync.o \
|
||||
crc.o directory.o misc.o udftime.o unicode.o
|
||||
directory.o misc.o udftime.o unicode.o
|
||||
|
|
|
|||
172
fs/udf/crc.c
172
fs/udf/crc.c
|
|
@ -1,172 +0,0 @@
|
|||
/*
|
||||
* crc.c
|
||||
*
|
||||
* PURPOSE
|
||||
* Routines to generate, calculate, and test a 16-bit CRC.
|
||||
*
|
||||
* DESCRIPTION
|
||||
* The CRC code was devised by Don P. Mitchell of AT&T Bell Laboratories
|
||||
* and Ned W. Rhodes of Software Systems Group. It has been published in
|
||||
* "Design and Validation of Computer Protocols", Prentice Hall,
|
||||
* Englewood Cliffs, NJ, 1991, Chapter 3, ISBN 0-13-539925-4.
|
||||
*
|
||||
* Copyright is held by AT&T.
|
||||
*
|
||||
* AT&T gives permission for the free use of the CRC source code.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
|
||||
#include "udfdecl.h"
|
||||
|
||||
static const uint16_t crc_table[256] = {
|
||||
0x0000U, 0x1021U, 0x2042U, 0x3063U, 0x4084U, 0x50a5U, 0x60c6U, 0x70e7U,
|
||||
0x8108U, 0x9129U, 0xa14aU, 0xb16bU, 0xc18cU, 0xd1adU, 0xe1ceU, 0xf1efU,
|
||||
0x1231U, 0x0210U, 0x3273U, 0x2252U, 0x52b5U, 0x4294U, 0x72f7U, 0x62d6U,
|
||||
0x9339U, 0x8318U, 0xb37bU, 0xa35aU, 0xd3bdU, 0xc39cU, 0xf3ffU, 0xe3deU,
|
||||
0x2462U, 0x3443U, 0x0420U, 0x1401U, 0x64e6U, 0x74c7U, 0x44a4U, 0x5485U,
|
||||
0xa56aU, 0xb54bU, 0x8528U, 0x9509U, 0xe5eeU, 0xf5cfU, 0xc5acU, 0xd58dU,
|
||||
0x3653U, 0x2672U, 0x1611U, 0x0630U, 0x76d7U, 0x66f6U, 0x5695U, 0x46b4U,
|
||||
0xb75bU, 0xa77aU, 0x9719U, 0x8738U, 0xf7dfU, 0xe7feU, 0xd79dU, 0xc7bcU,
|
||||
0x48c4U, 0x58e5U, 0x6886U, 0x78a7U, 0x0840U, 0x1861U, 0x2802U, 0x3823U,
|
||||
0xc9ccU, 0xd9edU, 0xe98eU, 0xf9afU, 0x8948U, 0x9969U, 0xa90aU, 0xb92bU,
|
||||
0x5af5U, 0x4ad4U, 0x7ab7U, 0x6a96U, 0x1a71U, 0x0a50U, 0x3a33U, 0x2a12U,
|
||||
0xdbfdU, 0xcbdcU, 0xfbbfU, 0xeb9eU, 0x9b79U, 0x8b58U, 0xbb3bU, 0xab1aU,
|
||||
0x6ca6U, 0x7c87U, 0x4ce4U, 0x5cc5U, 0x2c22U, 0x3c03U, 0x0c60U, 0x1c41U,
|
||||
0xedaeU, 0xfd8fU, 0xcdecU, 0xddcdU, 0xad2aU, 0xbd0bU, 0x8d68U, 0x9d49U,
|
||||
0x7e97U, 0x6eb6U, 0x5ed5U, 0x4ef4U, 0x3e13U, 0x2e32U, 0x1e51U, 0x0e70U,
|
||||
0xff9fU, 0xefbeU, 0xdfddU, 0xcffcU, 0xbf1bU, 0xaf3aU, 0x9f59U, 0x8f78U,
|
||||
0x9188U, 0x81a9U, 0xb1caU, 0xa1ebU, 0xd10cU, 0xc12dU, 0xf14eU, 0xe16fU,
|
||||
0x1080U, 0x00a1U, 0x30c2U, 0x20e3U, 0x5004U, 0x4025U, 0x7046U, 0x6067U,
|
||||
0x83b9U, 0x9398U, 0xa3fbU, 0xb3daU, 0xc33dU, 0xd31cU, 0xe37fU, 0xf35eU,
|
||||
0x02b1U, 0x1290U, 0x22f3U, 0x32d2U, 0x4235U, 0x5214U, 0x6277U, 0x7256U,
|
||||
0xb5eaU, 0xa5cbU, 0x95a8U, 0x8589U, 0xf56eU, 0xe54fU, 0xd52cU, 0xc50dU,
|
||||
0x34e2U, 0x24c3U, 0x14a0U, 0x0481U, 0x7466U, 0x6447U, 0x5424U, 0x4405U,
|
||||
0xa7dbU, 0xb7faU, 0x8799U, 0x97b8U, 0xe75fU, 0xf77eU, 0xc71dU, 0xd73cU,
|
||||
0x26d3U, 0x36f2U, 0x0691U, 0x16b0U, 0x6657U, 0x7676U, 0x4615U, 0x5634U,
|
||||
0xd94cU, 0xc96dU, 0xf90eU, 0xe92fU, 0x99c8U, 0x89e9U, 0xb98aU, 0xa9abU,
|
||||
0x5844U, 0x4865U, 0x7806U, 0x6827U, 0x18c0U, 0x08e1U, 0x3882U, 0x28a3U,
|
||||
0xcb7dU, 0xdb5cU, 0xeb3fU, 0xfb1eU, 0x8bf9U, 0x9bd8U, 0xabbbU, 0xbb9aU,
|
||||
0x4a75U, 0x5a54U, 0x6a37U, 0x7a16U, 0x0af1U, 0x1ad0U, 0x2ab3U, 0x3a92U,
|
||||
0xfd2eU, 0xed0fU, 0xdd6cU, 0xcd4dU, 0xbdaaU, 0xad8bU, 0x9de8U, 0x8dc9U,
|
||||
0x7c26U, 0x6c07U, 0x5c64U, 0x4c45U, 0x3ca2U, 0x2c83U, 0x1ce0U, 0x0cc1U,
|
||||
0xef1fU, 0xff3eU, 0xcf5dU, 0xdf7cU, 0xaf9bU, 0xbfbaU, 0x8fd9U, 0x9ff8U,
|
||||
0x6e17U, 0x7e36U, 0x4e55U, 0x5e74U, 0x2e93U, 0x3eb2U, 0x0ed1U, 0x1ef0U
|
||||
};
|
||||
|
||||
/*
|
||||
* udf_crc
|
||||
*
|
||||
* PURPOSE
|
||||
* Calculate a 16-bit CRC checksum using ITU-T V.41 polynomial.
|
||||
*
|
||||
* DESCRIPTION
|
||||
* The OSTA-UDF(tm) 1.50 standard states that using CRCs is mandatory.
|
||||
* The polynomial used is: x^16 + x^12 + x^15 + 1
|
||||
*
|
||||
* PRE-CONDITIONS
|
||||
* data Pointer to the data block.
|
||||
* size Size of the data block.
|
||||
*
|
||||
* POST-CONDITIONS
|
||||
* <return> CRC of the data block.
|
||||
*
|
||||
* HISTORY
|
||||
* July 21, 1997 - Andrew E. Mileski
|
||||
* Adapted from OSTA-UDF(tm) 1.50 standard.
|
||||
*/
|
||||
uint16_t udf_crc(const uint8_t *data, uint32_t size, uint16_t crc)
|
||||
{
|
||||
while (size--)
|
||||
crc = crc_table[(crc >> 8 ^ *(data++)) & 0xffU] ^ (crc << 8);
|
||||
|
||||
return crc;
|
||||
}
|
||||
|
||||
/****************************************************************************/
|
||||
#if defined(TEST)
|
||||
|
||||
/*
|
||||
* PURPOSE
|
||||
* Test udf_crc()
|
||||
*
|
||||
* HISTORY
|
||||
* July 21, 1997 - Andrew E. Mileski
|
||||
* Adapted from OSTA-UDF(tm) 1.50 standard.
|
||||
*/
|
||||
|
||||
unsigned char bytes[] = { 0x70U, 0x6AU, 0x77U };
|
||||
|
||||
int main(void)
|
||||
{
|
||||
unsigned short x;
|
||||
|
||||
x = udf_crc(bytes, sizeof bytes);
|
||||
printf("udf_crc: calculated = %4.4x, correct = %4.4x\n", x, 0x3299U);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* defined(TEST) */
|
||||
|
||||
/****************************************************************************/
|
||||
#if defined(GENERATE)
|
||||
|
||||
/*
|
||||
* PURPOSE
|
||||
* Generate a table for fast 16-bit CRC calculations (any polynomial).
|
||||
*
|
||||
* DESCRIPTION
|
||||
* The ITU-T V.41 polynomial is 010041.
|
||||
*
|
||||
* HISTORY
|
||||
* July 21, 1997 - Andrew E. Mileski
|
||||
* Adapted from OSTA-UDF(tm) 1.50 standard.
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
unsigned long crc, poly;
|
||||
int n, i;
|
||||
|
||||
/* Get the polynomial */
|
||||
sscanf(argv[1], "%lo", &poly);
|
||||
if (poly & 0xffff0000U) {
|
||||
fprintf(stderr, "polynomial is too large\en");
|
||||
exit(1);
|
||||
}
|
||||
|
||||
printf("/* CRC 0%o */\n", poly);
|
||||
|
||||
/* Create a table */
|
||||
printf("static unsigned short crc_table[256] = {\n");
|
||||
for (n = 0; n < 256; n++) {
|
||||
if (n % 8 == 0)
|
||||
printf("\t");
|
||||
crc = n << 8;
|
||||
for (i = 0; i < 8; i++) {
|
||||
if (crc & 0x8000U)
|
||||
crc = (crc << 1) ^ poly;
|
||||
else
|
||||
crc <<= 1;
|
||||
crc &= 0xFFFFU;
|
||||
}
|
||||
if (n == 255)
|
||||
printf("0x%04xU ", crc);
|
||||
else
|
||||
printf("0x%04xU, ", crc);
|
||||
if (n % 8 == 7)
|
||||
printf("\n");
|
||||
}
|
||||
printf("};\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* defined(GENERATE) */
|
||||
|
|
@ -37,6 +37,7 @@
|
|||
#include <linux/buffer_head.h>
|
||||
#include <linux/writeback.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/crc-itu-t.h>
|
||||
|
||||
#include "udf_i.h"
|
||||
#include "udf_sb.h"
|
||||
|
|
@ -1419,9 +1420,9 @@ static int udf_update_inode(struct inode *inode, int do_sync)
|
|||
iinfo->i_location.
|
||||
logicalBlockNum);
|
||||
use->descTag.descCRCLength = cpu_to_le16(crclen);
|
||||
use->descTag.descCRC = cpu_to_le16(udf_crc((char *)use +
|
||||
sizeof(tag), crclen,
|
||||
0));
|
||||
use->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)use +
|
||||
sizeof(tag),
|
||||
crclen));
|
||||
use->descTag.tagChecksum = udf_tag_checksum(&use->descTag);
|
||||
|
||||
mark_buffer_dirty(bh);
|
||||
|
|
@ -1584,8 +1585,8 @@ static int udf_update_inode(struct inode *inode, int do_sync)
|
|||
crclen += iinfo->i_lenEAttr + iinfo->i_lenAlloc -
|
||||
sizeof(tag);
|
||||
fe->descTag.descCRCLength = cpu_to_le16(crclen);
|
||||
fe->descTag.descCRC = cpu_to_le16(udf_crc((char *)fe + sizeof(tag),
|
||||
crclen, 0));
|
||||
fe->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)fe + sizeof(tag),
|
||||
crclen));
|
||||
fe->descTag.tagChecksum = udf_tag_checksum(&fe->descTag);
|
||||
|
||||
/* write the data blocks */
|
||||
|
|
|
|||
|
|
@ -24,6 +24,7 @@
|
|||
#include <linux/fs.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/crc-itu-t.h>
|
||||
|
||||
#include "udf_i.h"
|
||||
#include "udf_sb.h"
|
||||
|
|
@ -135,8 +136,8 @@ struct genericFormat *udf_add_extendedattr(struct inode *inode, uint32_t size,
|
|||
/* rewrite CRC + checksum of eahd */
|
||||
crclen = sizeof(struct extendedAttrHeaderDesc) - sizeof(tag);
|
||||
eahd->descTag.descCRCLength = cpu_to_le16(crclen);
|
||||
eahd->descTag.descCRC = cpu_to_le16(udf_crc((char *)eahd +
|
||||
sizeof(tag), crclen, 0));
|
||||
eahd->descTag.descCRC = cpu_to_le16(crc_itu_t(0, (char *)eahd +
|
||||
sizeof(tag), crclen));
|
||||
eahd->descTag.tagChecksum = udf_tag_checksum(&eahd->descTag);
|
||||
iinfo->i_lenEAttr += size;
|
||||
return (struct genericFormat *)&ea[offset];
|
||||
|
|
@ -241,8 +242,9 @@ struct buffer_head *udf_read_tagged(struct super_block *sb, uint32_t block,
|
|||
|
||||
/* Verify the descriptor CRC */
|
||||
if (le16_to_cpu(tag_p->descCRCLength) + sizeof(tag) > sb->s_blocksize ||
|
||||
le16_to_cpu(tag_p->descCRC) == udf_crc(bh->b_data + sizeof(tag),
|
||||
le16_to_cpu(tag_p->descCRCLength), 0))
|
||||
le16_to_cpu(tag_p->descCRC) == crc_itu_t(0,
|
||||
bh->b_data + sizeof(tag),
|
||||
le16_to_cpu(tag_p->descCRCLength)))
|
||||
return bh;
|
||||
|
||||
udf_debug("Crc failure block %d: crc = %d, crclen = %d\n", block,
|
||||
|
|
@ -266,7 +268,7 @@ void udf_update_tag(char *data, int length)
|
|||
length -= sizeof(tag);
|
||||
|
||||
tptr->descCRCLength = cpu_to_le16(length);
|
||||
tptr->descCRC = cpu_to_le16(udf_crc(data + sizeof(tag), length, 0));
|
||||
tptr->descCRC = cpu_to_le16(crc_itu_t(0, data + sizeof(tag), length));
|
||||
tptr->tagChecksum = udf_tag_checksum(tptr);
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -31,6 +31,7 @@
|
|||
#include <linux/smp_lock.h>
|
||||
#include <linux/buffer_head.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/crc-itu-t.h>
|
||||
|
||||
static inline int udf_match(int len1, const char *name1, int len2,
|
||||
const char *name2)
|
||||
|
|
@ -97,25 +98,23 @@ int udf_write_fi(struct inode *inode, struct fileIdentDesc *cfi,
|
|||
memset(fibh->ebh->b_data, 0x00, padlen + offset);
|
||||
}
|
||||
|
||||
crc = udf_crc((uint8_t *)cfi + sizeof(tag),
|
||||
sizeof(struct fileIdentDesc) - sizeof(tag), 0);
|
||||
crc = crc_itu_t(0, (uint8_t *)cfi + sizeof(tag),
|
||||
sizeof(struct fileIdentDesc) - sizeof(tag));
|
||||
|
||||
if (fibh->sbh == fibh->ebh) {
|
||||
crc = udf_crc((uint8_t *)sfi->impUse,
|
||||
crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
|
||||
crclen + sizeof(tag) -
|
||||
sizeof(struct fileIdentDesc), crc);
|
||||
sizeof(struct fileIdentDesc));
|
||||
} else if (sizeof(struct fileIdentDesc) >= -fibh->soffset) {
|
||||
crc = udf_crc(fibh->ebh->b_data +
|
||||
crc = crc_itu_t(crc, fibh->ebh->b_data +
|
||||
sizeof(struct fileIdentDesc) +
|
||||
fibh->soffset,
|
||||
crclen + sizeof(tag) -
|
||||
sizeof(struct fileIdentDesc),
|
||||
crc);
|
||||
sizeof(struct fileIdentDesc));
|
||||
} else {
|
||||
crc = udf_crc((uint8_t *)sfi->impUse,
|
||||
-fibh->soffset - sizeof(struct fileIdentDesc),
|
||||
crc);
|
||||
crc = udf_crc(fibh->ebh->b_data, fibh->eoffset, crc);
|
||||
crc = crc_itu_t(crc, (uint8_t *)sfi->impUse,
|
||||
-fibh->soffset - sizeof(struct fileIdentDesc));
|
||||
crc = crc_itu_t(crc, fibh->ebh->b_data, fibh->eoffset);
|
||||
}
|
||||
|
||||
cfi->descTag.descCRC = cpu_to_le16(crc);
|
||||
|
|
|
|||
|
|
@ -56,6 +56,7 @@
|
|||
#include <linux/mount.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <linux/bitmap.h>
|
||||
#include <linux/crc-itu-t.h>
|
||||
#include <asm/byteorder.h>
|
||||
|
||||
#include "udf_sb.h"
|
||||
|
|
@ -1765,8 +1766,8 @@ static void udf_open_lvid(struct super_block *sb)
|
|||
lvid->integrityType = LVID_INTEGRITY_TYPE_OPEN;
|
||||
|
||||
lvid->descTag.descCRC = cpu_to_le16(
|
||||
udf_crc((char *)lvid + sizeof(tag),
|
||||
le16_to_cpu(lvid->descTag.descCRCLength), 0));
|
||||
crc_itu_t(0, (char *)lvid + sizeof(tag),
|
||||
le16_to_cpu(lvid->descTag.descCRCLength)));
|
||||
|
||||
lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
|
||||
mark_buffer_dirty(bh);
|
||||
|
|
@ -1800,9 +1801,8 @@ static void udf_close_lvid(struct super_block *sb)
|
|||
lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE);
|
||||
|
||||
lvid->descTag.descCRC = cpu_to_le16(
|
||||
udf_crc((char *)lvid + sizeof(tag),
|
||||
le16_to_cpu(lvid->descTag.descCRCLength),
|
||||
0));
|
||||
crc_itu_t(0, (char *)lvid + sizeof(tag),
|
||||
le16_to_cpu(lvid->descTag.descCRCLength)));
|
||||
|
||||
lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag);
|
||||
mark_buffer_dirty(bh);
|
||||
|
|
|
|||
|
|
@ -220,9 +220,6 @@ extern struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize,
|
|||
extern long_ad *udf_get_filelongad(uint8_t *, int, uint32_t *, int);
|
||||
extern short_ad *udf_get_fileshortad(uint8_t *, int, uint32_t *, int);
|
||||
|
||||
/* crc.c */
|
||||
extern uint16_t udf_crc(const uint8_t *, uint32_t, uint16_t);
|
||||
|
||||
/* udftime.c */
|
||||
extern struct timespec *udf_disk_stamp_to_time(struct timespec *dest,
|
||||
timestamp src);
|
||||
|
|
|
|||
|
|
@ -23,6 +23,7 @@
|
|||
#include <linux/kernel.h>
|
||||
#include <linux/string.h> /* for memset */
|
||||
#include <linux/nls.h>
|
||||
#include <linux/crc-itu-t.h>
|
||||
|
||||
#include "udf_sb.h"
|
||||
|
||||
|
|
@ -454,7 +455,7 @@ static int udf_translate_to_linux(uint8_t *newName, uint8_t *udfName,
|
|||
} else if (newIndex > 250)
|
||||
newIndex = 250;
|
||||
newName[newIndex++] = CRC_MARK;
|
||||
valueCRC = udf_crc(fidName, fidNameLen, 0);
|
||||
valueCRC = crc_itu_t(0, fidName, fidNameLen);
|
||||
newName[newIndex++] = hexChar[(valueCRC & 0xf000) >> 12];
|
||||
newName[newIndex++] = hexChar[(valueCRC & 0x0f00) >> 8];
|
||||
newName[newIndex++] = hexChar[(valueCRC & 0x00f0) >> 4];
|
||||
|
|
|
|||
Loading…
Reference in New Issue