From 2dd125048dedbae3fbad6ae4b89f4b9b6e44b9b1 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= Date: Mon, 9 May 2016 19:00:53 +0200 Subject: mtd: trx: use separated buffer for TRX header MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- package/system/mtd/src/trx.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'package/system/mtd/src/trx.c') 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); } -- cgit v1.2.3