udf: constify crc

- 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>

diff --git a/fs/udf/crc.c b/fs/udf/crc.c
index b166129..f178c63 100644 (file)
--- a/fs/udf/crc.c
+++ b/fs/udf/crc.c
@@ -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);

diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 2310b5c..26bc9c2 100644 (file)
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -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);