X-Git-Url: https://git.archive.openwrt.org/?p=openwrt.git;a=blobdiff_plain;f=package%2Fsystem%2Fmtd%2Fsrc%2Ftrx.c;h=816f0eba5f0e88aba16952d10b1799cd97df0150;hp=089d1ace46398376591b0dfebbefd196598acffd;hb=a4953d94d3a5f86658dd8d210356ff35849a6e31;hpb=3856b0da484900ec37d230f1ac6b64ddf2eda102

diff --git a/package/system/mtd/src/trx.c b/package/system/mtd/src/trx.c
index 089d1ace46..816f0eba5f 100644
--- a/package/system/mtd/src/trx.c
+++ b/package/system/mtd/src/trx.c
@@ -26,6 +26,7 @@
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#include <endian.h>
 #include <string.h>
 #include <errno.h>
 
@@ -35,6 +36,8 @@
 #include "crc32.h"
 
 #define TRX_MAGIC       0x30524448      /* "HDR0" */
+#define TRX_CRC32_DATA_OFFSET	12	/* First 12 bytes are not covered by CRC32 */
+#define TRX_CRC32_DATA_SIZE	16
 struct trx_header {
 	uint32_t magic;		/* "HDR0" */
 	uint32_t len;		/* Length of file including header */
@@ -111,10 +114,12 @@ trx_check(int imagefd, const char *mtd, char *buf, int *len)
 	if (strcmp(mtd, "firmware") != 0)
 		return 1;
 
-	*len = read(imagefd, buf, 32);
 	if (*len < 32) {
-		fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
-		return 0;
+		*len += read(imagefd, buf + *len, 32 - *len);
+		if (*len < 32) {
+			fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
+			return 0;
+		}
 	}
 
 	if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
@@ -145,10 +150,12 @@ trx_check(int imagefd, const char *mtd, char *buf, int *len)
 #endif
 
 int
-mtd_fixtrx(const char *mtd, size_t offset)
+mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
 {
+	size_t data_offset;
 	int fd;
 	struct trx_header *trx;
+	char *first_block;
 	char *buf;
 	ssize_t res;
 	size_t block_offset;
@@ -162,42 +169,60 @@ mtd_fixtrx(const char *mtd, size_t offset)
 		exit(1);
 	}
 
+	data_offset = offset + TRX_CRC32_DATA_OFFSET;
+	if (data_size)
+		data_size += TRX_CRC32_DATA_SIZE;
+	else
+		data_size = erasesize - TRX_CRC32_DATA_OFFSET;
+
 	block_offset = offset & ~(erasesize - 1);
 	offset -= block_offset;
 
-	if (block_offset + erasesize > mtdsize) {
+	if (data_offset + data_size > mtdsize) {
 		fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
 		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);
 	}
 
-	if (trx->len == STORE32_LE(erasesize - offset)) {
+	if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET)) {
 		if (quiet < 2)
 			fprintf(stderr, "Header already fixed, exiting\n");
 		close(fd);
 		return 0;
 	}
 
-	trx->len = STORE32_LE(erasesize - offset);
+	buf = malloc(data_size);
+	if (!buf) {
+		perror("malloc");
+		exit(1);
+	}
+
+	res = pread(fd, buf, data_size, data_offset);
+	if (res != data_size) {
+		perror("pread");
+		exit(1);
+	}
+
+	trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
 
-	trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
+	trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
 	if (mtd_erase_block(fd, block_offset)) {
 		fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
 		exit(1);
@@ -206,7 +231,7 @@ 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);
 	}