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| author | Rafał Miłecki <zajec5@gmail.com> | 2016-05-09 18:10:30 +0000 |
|---|---|---|
| committer | Luka Perkov <luka@openwrt.org> | 2016-06-19 19:24:14 +0200 |
| commit | 5a5787d877400eb83809ea5dc9af5e9fccc5b986 (patch) | |
| tree | 10c6b086e42988abd3382658f9e205a0ff91d9e5 /package/system | |
| parent | 0af265171b9ba732ca8b49b4c34289146be7a167 (diff) | |
| download | master-187ad058-5a5787d877400eb83809ea5dc9af5e9fccc5b986.tar.gz master-187ad058-5a5787d877400eb83809ea5dc9af5e9fccc5b986.tar.bz2 master-187ad058-5a5787d877400eb83809ea5dc9af5e9fccc5b986.zip | |
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>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@49316 3c298f89-4303-0410-b956-a3cf2f4a3e73
Diffstat (limited to 'package/system')
| -rw-r--r-- | package/system/mtd/src/trx.c | 23 |
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); } |