*/
#include <byteswap.h>
+#include <endian.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
+#if !defined(__BYTE_ORDER)
+#error "Unknown byte order"
+#endif
+
#if __BYTE_ORDER == __BIG_ENDIAN
#define cpu_to_le32(x) bswap_32(x)
#define le32_to_cpu(x) bswap_32(x)
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++;
size_t bytes, length;
uint8_t buf[1024];
uint32_t crc32;
- int i;
int err = 0;
if (argc < 3) {
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;
}
static int otrx_create_write_hdr(FILE *trx, struct trx_header *hdr) {
size_t bytes, length;
- uint8_t *buf;
+ uint8_t buf[1024];
uint32_t crc32;
hdr->magic = cpu_to_le32(TRX_MAGIC);
length = le32_to_cpu(hdr->length);
- buf = malloc(length);
- if (!buf) {
- fprintf(stderr, "Couldn't alloc %zu B buffer\n", length);
- return -ENOMEM;
- }
-
- fseek(trx, 0, SEEK_SET);
- bytes = fread(buf, 1, length, trx);
- if (bytes != length) {
- fprintf(stderr, "Couldn't read %zu B of data from %s\n", length, trx_path);
- return -ENOMEM;
+ crc32 = 0xffffffff;
+ fseek(trx, TRX_FLAGS_OFFSET, SEEK_SET);
+ length -= TRX_FLAGS_OFFSET;
+ while ((bytes = fread(buf, 1, otrx_min(sizeof(buf), length), trx)) > 0) {
+ crc32 = otrx_crc32(crc32, buf, bytes);
+ length -= bytes;
}
-
- crc32 = otrx_crc32(buf + TRX_FLAGS_OFFSET, length - TRX_FLAGS_OFFSET);
hdr->crc32 = cpu_to_le32(crc32);
fseek(trx, 0, SEEK_SET);