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authorRafał Miłecki <zajec5@gmail.com>2016-05-09 19:00:53 +0200
committerRafał Miłecki <zajec5@gmail.com>2016-05-09 20:10:58 +0200
commit2dd125048dedbae3fbad6ae4b89f4b9b6e44b9b1 (patch)
tree5937383561c57f48bfc04964bfac9dfa32e973d7
parent6de401b1f8a1d094ae59baf65197fe9dad624195 (diff)
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mtd: trx: use separated buffer for TRX header
We plan to adjust usage of the main buffer to allow reading custom amount of data for CRC32. This means we need another buffer that will be always block aligned. Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
-rw-r--r--package/system/mtd/src/trx.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/package/system/mtd/src/trx.c b/package/system/mtd/src/trx.c
index 00c4d6c0b5..f310f51087 100644
--- a/package/system/mtd/src/trx.c
+++ b/package/system/mtd/src/trx.c
@@ -152,6 +152,7 @@ mtd_fixtrx(const char *mtd, size_t offset)
{
int fd;
struct trx_header *trx;
+ char *first_block;
char *buf;
ssize_t res;
size_t block_offset;
@@ -173,19 +174,19 @@ mtd_fixtrx(const char *mtd, size_t offset)
exit(1);
}
- buf = malloc(erasesize);
- if (!buf) {
+ first_block = malloc(erasesize);
+ if (!first_block) {
perror("malloc");
exit(1);
}
- res = pread(fd, buf, erasesize, block_offset);
+ res = pread(fd, first_block, erasesize, block_offset);
if (res != erasesize) {
perror("pread");
exit(1);
}
- trx = (struct trx_header *) (buf + offset);
+ trx = (struct trx_header *)(first_block + offset);
if (trx->magic != STORE32_LE(0x30524448)) {
fprintf(stderr, "No trx magic found\n");
exit(1);
@@ -198,6 +199,18 @@ mtd_fixtrx(const char *mtd, size_t offset)
return 0;
}
+ buf = malloc(erasesize);
+ if (!buf) {
+ perror("malloc");
+ exit(1);
+ }
+
+ res = pread(fd, buf, erasesize, block_offset);
+ if (res != erasesize) {
+ perror("pread");
+ exit(1);
+ }
+
trx->len = STORE32_LE(erasesize - offset);
trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
@@ -209,7 +222,7 @@ mtd_fixtrx(const char *mtd, size_t offset)
if (quiet < 2)
fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
- if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
+ if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
exit(1);
}