提交 c8ed837d 编写于 作者: M marcin.slusarz@gmail.com 提交者: Jan Kara

udf: constify crc

- constify internal crc table
- mark udf_crc "in" parameter as const
Signed-off-by: NMarcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: NJan Kara <jack@suse.cz>
上级 34f953dd
...@@ -23,7 +23,7 @@ ...@@ -23,7 +23,7 @@
#include "udfdecl.h" #include "udfdecl.h"
static uint16_t crc_table[256] = { static const uint16_t crc_table[256] = {
0x0000U, 0x1021U, 0x2042U, 0x3063U, 0x4084U, 0x50a5U, 0x60c6U, 0x70e7U, 0x0000U, 0x1021U, 0x2042U, 0x3063U, 0x4084U, 0x50a5U, 0x60c6U, 0x70e7U,
0x8108U, 0x9129U, 0xa14aU, 0xb16bU, 0xc18cU, 0xd1adU, 0xe1ceU, 0xf1efU, 0x8108U, 0x9129U, 0xa14aU, 0xb16bU, 0xc18cU, 0xd1adU, 0xe1ceU, 0xf1efU,
0x1231U, 0x0210U, 0x3273U, 0x2252U, 0x52b5U, 0x4294U, 0x72f7U, 0x62d6U, 0x1231U, 0x0210U, 0x3273U, 0x2252U, 0x52b5U, 0x4294U, 0x72f7U, 0x62d6U,
...@@ -79,7 +79,7 @@ static uint16_t crc_table[256] = { ...@@ -79,7 +79,7 @@ static uint16_t crc_table[256] = {
* July 21, 1997 - Andrew E. Mileski * July 21, 1997 - Andrew E. Mileski
* Adapted from OSTA-UDF(tm) 1.50 standard. * 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--) while (size--)
crc = crc_table[(crc >> 8 ^ *(data++)) & 0xffU] ^ (crc << 8); crc = crc_table[(crc >> 8 ^ *(data++)) & 0xffU] ^ (crc << 8);
......
...@@ -210,7 +210,7 @@ extern long_ad *udf_get_filelongad(uint8_t *, int, uint32_t *, int); ...@@ -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); extern short_ad *udf_get_fileshortad(uint8_t *, int, uint32_t *, int);
/* crc.c */ /* 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 */ /* udftime.c */
extern time_t *udf_stamp_to_time(time_t *, long *, kernel_timestamp); extern time_t *udf_stamp_to_time(time_t *, long *, kernel_timestamp);
......
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册