package/mtd: add fixtrx command

 * patch by Bernhard Loos
 * note: trailing whitespaces are removed

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@20524 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mtd/src/mtd.c b/package/mtd/src/mtd.c
index 7525476..ff75fcb 100644 (file)
--- a/package/mtd/src/mtd.c
+++ b/package/mtd/src/mtd.c
@@ -44,10 +44,23 @@
 #include "mtd-api.h"
 #include "fis.h"
 #include "mtd.h"
+#include "crc32.h"
 
 #define MAX_ARGS 8
 #define JFFS2_DEFAULT_DIR      "" /* directory name without /, empty means root dir */
 
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define STORE32_LE(X)           (X)
+#else
+#error unkown endianness!
+#endif
+
+ssize_t pread(int fd, void *buf, size_t count, off_t offset);
+ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
+
+#define TRX_MAGIC       0x30524448      /* "HDR0" */
 struct trx_header {
        uint32_t magic;         /* "HDR0" */
        uint32_t len;           /* Length of file including header */
@@ -252,6 +265,82 @@ mtd_erase(const char *mtd)
 }
 
 static int
+mtd_fixtrx(const char *mtd, size_t offset)
+{
+       int fd;
+       struct trx_header *trx;
+       char *buf;
+       ssize_t res;
+       size_t block_offset;
+
+       if (quiet < 2)
+               fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
+
+       block_offset = offset & ~(erasesize - 1);
+       offset -= block_offset;
+
+       fd = mtd_check_open(mtd);
+       if(fd < 0) {
+               fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+               exit(1);
+       }
+
+       if (block_offset + erasesize > mtdsize) {
+               fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
+               exit(1);
+       }
+
+       buf = malloc(erasesize);
+       if (!buf) {
+               perror("malloc");
+               exit(1);
+       }
+
+       res = pread(fd, buf, erasesize, block_offset);
+       if (res != erasesize) {
+               perror("pread");
+               exit(1);
+       }
+
+       trx = (struct trx_header *) (buf + offset);
+       if (trx->magic != STORE32_LE(0x30524448)) {
+               fprintf(stderr, "No trx magic found\n");
+               exit(1);
+       }
+
+       if (trx->len == STORE32_LE(erasesize - offset)) {
+               if (quiet < 2)
+                       fprintf(stderr, "Header already fixed, exiting\n");
+               close(fd);
+               return 0;
+       }
+
+       trx->len = STORE32_LE(erasesize - offset);
+
+       trx->crc32 = STORE32_LE(crc32buf((char*) &trx->flag_version, erasesize - offset - 3*4));
+       if (mtd_erase_block(fd, block_offset)) {
+               fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
+               exit(1);
+       }
+
+       if (quiet < 2)
+               fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
+
+       if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
+               fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
+               exit(1);
+       }
+
+       if (quiet < 2)
+               fprintf(stderr, "Done.\n");
+
+       close (fd);
+       sync();
+       return 0;
+
+}
+
+static int
 mtd_refresh(const char *mtd)
 {
        int fd;
@@ -480,6 +569,7 @@ static void usage(void)
        "        erase                   erase all data on device\n"
        "        write <imagefile>|-     write <imagefile> (use - for stdin) to device\n"
        "        jffs2write <file>       append <file> to the jffs2 partition on the device\n"
+       "        fixtrx                  fix the checksum in a trx header on first boot\n"
        "Following options are available:\n"
        "        -q                      quiet mode (once: no [w] on writing,\n"
        "                                           twice: no status messages)\n"
@@ -488,6 +578,7 @@ static void usage(void)
        "        -e <device>             erase <device> before executing the command\n"
        "        -d <name>               directory for jffs2write, defaults to \"tmp\"\n"
        "        -j <name>               integrate <file> into jffs2 data when writing an image\n"
+       "        -o offset               offset of the trx header in the partition (for fixtrx)\n"
 #ifdef FIS_SUPPORT
        "        -F <part>[:<size>[:<entrypoint>]][,<part>...]\n"
        "                                alter the fis partition table to create new partitions replacing\n"
@@ -518,12 +609,14 @@ int main (int argc, char **argv)
        int ch, i, boot, imagefd = 0, force, unlocked;
        char *erase[MAX_ARGS], *device = NULL;
        char *fis_layout = NULL;
+       size_t offset = 0;
        enum {
                CMD_ERASE,
                CMD_WRITE,
                CMD_UNLOCK,
                CMD_REFRESH,
-               CMD_JFFS2WRITE
+               CMD_JFFS2WRITE,
+               CMD_FIXTRX,
        } cmd = -1;
 
        erase[0] = NULL;
@@ -536,7 +629,7 @@ int main (int argc, char **argv)
 #ifdef FIS_SUPPORT
                        "F:"
 #endif
-                       "frqe:d:j:")) != -1)
+                       "frqe:d:j:o:")) != -1)
                switch (ch) {
                        case 'f':
                                force = 1;
@@ -561,6 +654,14 @@ int main (int argc, char **argv)
                        case 'd':
                                jffs2dir = optarg;
                                break;
+                       case 'o':
+                               errno = 0;
+                               offset = strtoul(optarg, 0, 0);
+                               if (errno) {
+                                       fprintf(stderr, "-o: illegal numeric string\n");
+                                       usage();
+                               }
+                               break;
 #ifdef FIS_SUPPORT
                        case 'F':
                                fis_layout = optarg;
@@ -585,6 +686,9 @@ int main (int argc, char **argv)
        } else if ((strcmp(argv[0], "erase") == 0) && (argc == 2)) {
                cmd = CMD_ERASE;
                device = argv[1];
+       } else if ((strcmp(argv[0], "fixtrx") == 0) && (argc == 2)) {
+               cmd = CMD_FIXTRX;
+               device = argv[1];
        } else if ((strcmp(argv[0], "write") == 0) && (argc == 3)) {
                cmd = CMD_WRITE;
                device = argv[2];
@@ -657,6 +761,9 @@ int main (int argc, char **argv)
                case CMD_REFRESH:
                        mtd_refresh(device);
                        break;
+               case CMD_FIXTRX:
+                       mtd_fixtrx(device, offset);
+                       break;
        }
 
        sync();

diff --git a/package/mtd/src/trx.c b/package/mtd/src/trx.c
index f483175..7094ef6 100644 (file)
--- a/package/mtd/src/trx.c
+++ b/package/mtd/src/trx.c
@@ -1,7 +1,7 @@
 /*
  * trx.c
  *
- * Copyright (C) 2005 Mike Baker 
+ * Copyright (C) 2005 Mike Baker
  * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
  *
  * This program is free software; you can redistribute it and/or
@@ -75,7 +75,6 @@ trx_fixup(int fd, const char *name)
                goto err;
        }
 
-       init_crc32();
        scan = ptr + offsetof(struct trx_header, flag_version);
        trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
        msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);