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Commit c8ed837d authored by marcin.slusarz@gmail.com's avatar marcin.slusarz@gmail.com Committed by Jan Kara
Browse files

udf: constify crc 



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

Signed-off-by: default avatarMarcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent 34f953dd

fs/udf/crc.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

fs/udf/udfdecl.h

+1 −1
Original line number Diff line number Diff line
@@ -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);