mtd: detect image format when writing

[openwrt/openwrt.git] / package / system / mtd / src / mtd.c

diff --git a/package/system/mtd/src/mtd.c b/package/system/mtd/src/mtd.c
index 02476306f65ef04dd77dcd809667cc32501dc2cc..03ee5671d5d4c32575ba13987c8ca94159460022 100644 (file)
--- a/package/system/mtd/src/mtd.c
+++ b/package/system/mtd/src/mtd.c
@@ -22,6 +22,7 @@
  */
 
 #define _GNU_SOURCE
+#include <byteswap.h>
 #include <limits.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -50,8 +51,32 @@
 #define MAX_ARGS 8
 #define JFFS2_DEFAULT_DIR      "" /* directory name without /, empty means root dir */
 
+#define TRX_MAGIC              0x48445230      /* "HDR0" */
+#define SEAMA_MAGIC            0x5ea3a417
+
+#if !defined(__BYTE_ORDER)
+#error "Unknown byte order"
+#endif
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define cpu_to_be32(x) (x)
+#define be32_to_cpu(x) (x)
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define cpu_to_be32(x) bswap_32(x)
+#define be32_to_cpu(x) bswap_32(x)
+#else
+#error "Unsupported endianness"
+#endif
+
+enum mtd_image_format {
+       MTD_IMAGE_FORMAT_UNKNOWN,
+       MTD_IMAGE_FORMAT_TRX,
+       MTD_IMAGE_FORMAT_SEAMA,
+};
+
 static char *buf = NULL;
 static char *imagefile = NULL;
+static enum mtd_image_format imageformat = MTD_IMAGE_FORMAT_UNKNOWN;
 static char *jffs2file = NULL, *jffs2dir = JFFS2_DEFAULT_DIR;
 static int buflen = 0;
 int quiet;
@@ -149,13 +174,39 @@ int mtd_write_buffer(int fd, const char *buf, int offset, int length)
        return 0;
 }
 
-
 static int
 image_check(int imagefd, const char *mtd)
 {
+       uint32_t magic;
        int ret = 1;
-       if (trx_check) {
-         ret = trx_check(imagefd, mtd, buf, &buflen);
+
+       if (buflen < sizeof(magic)) {
+               buflen += read(imagefd, buf + buflen, sizeof(magic) - buflen);
+               if (buflen < sizeof(magic)) {
+                       fprintf(stdout, "Could not get image magic\n");
+                       return 0;
+               }
+       }
+       magic = ((uint32_t *)buf)[0];
+
+       if (be32_to_cpu(magic) == TRX_MAGIC)
+               imageformat = MTD_IMAGE_FORMAT_TRX;
+       else if (be32_to_cpu(magic) == SEAMA_MAGIC)
+               imageformat = MTD_IMAGE_FORMAT_SEAMA;
+
+       switch (imageformat) {
+       case MTD_IMAGE_FORMAT_TRX:
+               if (trx_check)
+                       ret = trx_check(imagefd, mtd, buf, &buflen);
+               break;
+       case MTD_IMAGE_FORMAT_SEAMA:
+               break;
+       default:
+#ifdef target_brcm
+               if (!strcmp(mtd, "firmware"))
+                       ret = 0;
+#endif
+               break;
        }
 
        return ret;