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udf: use crc_itu_t from lib instead of udf_crc

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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
2008-04-17 09:47:48 +02:00
committed by Jan Kara
parent 706047a797
commit f845fced91
9 changed files with 32 additions and 203 deletions
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21
fs/udf/namei.c
View File

@@ -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);