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otrx: use helper function when checking image's CRC32 

This requires changing this helper to accept initial/current CRC32
value as argument but it allows dropping duplicated (complex?) code
calculating the CRC32.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
owl
Rafał Miłecki 2017-11-13 23:07:45 +01:00
parent 31ebbe34cc
commit c6761e7c8e
1 changed files with 3 additions and 7 deletions
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10
package/utils/otrx/src/otrx.c
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@ -124,9 +124,7 @@ static const uint32_t crc32_tbl[] = {
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
uint32_t otrx_crc32(uint8_t *buf, size_t len) {
uint32_t crc = 0xffffffff;
uint32_t otrx_crc32(uint32_t crc, uint8_t *buf, size_t len) {
while (len) {
crc = crc32_tbl[(crc ^ *buf) & 0xff] ^ (crc >> 8);
buf++;
@ -158,7 +156,6 @@ static int otrx_check(int argc, char **argv) {
size_t bytes, length;
uint8_t buf[1024];
uint32_t crc32;
int i;
int err = 0;
if (argc < 3) {
@ -203,8 +200,7 @@ static int otrx_check(int argc, char **argv) {
fseek(trx, trx_offset + TRX_FLAGS_OFFSET, SEEK_SET);
length -= TRX_FLAGS_OFFSET;
while ((bytes = fread(buf, 1, otrx_min(sizeof(buf), length), trx)) > 0) {
for (i = 0; i < bytes; i++)
crc32 = crc32_tbl[(crc32 ^ buf[i]) & 0xff] ^ (crc32 >> 8);
crc32 = otrx_crc32(crc32, buf, bytes);
length -= bytes;
}
@ -316,7 +312,7 @@ static int otrx_create_write_hdr(FILE *trx, struct trx_header *hdr) {
return -ENOMEM;
}
crc32 = otrx_crc32(buf + TRX_FLAGS_OFFSET, length - TRX_FLAGS_OFFSET);
crc32 = otrx_crc32(0xffffffff, buf + TRX_FLAGS_OFFSET, length - TRX_FLAGS_OFFSET);
hdr->crc32 = cpu_to_le32(crc32);
fseek(trx, 0, SEEK_SET);