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udf: constify crc

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- constify internal crc table
- mark udf_crc "in" parameter as const

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
marcin.slusarz@gmail.com 2008-02-27 22:38:38 +01:00 committed by Jan Kara
parent 34f953ddfd
commit c8ed837d37
2 changed files with 3 additions and 3 deletions
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4
fs/udf/crc.c
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@ -23,7 +23,7 @@
#include "udfdecl.h"
static uint16_t crc_table[256] = {
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,
@ -79,7 +79,7 @@ static uint16_t crc_table[256] = {
* July 21, 1997 - Andrew E. Mileski
* Adapted from OSTA-UDF(tm) 1.50 standard.
*/
uint16_t udf_crc(uint8_t *data, uint32_t size, uint16_t crc)
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);

2
fs/udf/udfdecl.h
View File

@ -210,7 +210,7 @@ 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(uint8_t *, uint32_t, uint16_t);
extern uint16_t udf_crc(const uint8_t *, uint32_t, uint16_t);
/* udftime.c */
extern time_t *udf_stamp_to_time(time_t *, long *, kernel_timestamp);