Initial attempt at a --convert option to convert HFS formatted ipods (Macpods) to FAT32 format. This needs testing (as well as the existing --format feature) before adding as an option in the interactive mode and fully documenting.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14030 a1c6a512-1295-4272-9138-f99709370657

rbutil/ipodpatcher/ipodio.h

@@ -53,9 +53,9 @@ struct ipod_directory_t {
 };
 
 struct partinfo_t {
-  unsigned long start; /* first sector (LBA) */
+  uint32_t start; /* first sector (LBA) */
-  unsigned long size;  /* number of sectors */
+  uint32_t size;  /* number of sectors */
-  int type;
+  uint32_t type;
 };
 
 struct ipod_t {

rbutil/ipodpatcher/ipodpatcher.c

@@ -171,6 +171,8 @@ int read_partinfo(struct ipod_t* ipod, int silent)
         return -1;
     }
 
+    memset(ipod->pinfo, 0, sizeof(ipod->pinfo));
+
     if ((sectorbuf[510] == 0x55) && (sectorbuf[511] == 0xaa)) {
         /* DOS partition table */
         ipod->macpod = 0;
@@ -1289,3 +1291,60 @@ int ipod_scan(struct ipod_t* ipod)
     }
     return n;
 }
+
+static void put_int32le(uint32_t x, unsigned char* p)
+{
+    p[0] = x & 0xff;
+    p[1] = (x >> 8) & 0xff;
+    p[2] = (x >> 16) & 0xff;
+    p[3] = (x >> 24) & 0xff;
+}
+
+int write_dos_partition_table(struct ipod_t* ipod)
+{
+    unsigned char* p;
+    int i, n;
+    uint32_t type;
+
+    /* Only support 512-byte sectors at the moment */
+    if ( ipod->sector_size != 512 )
+    {
+        fprintf(stderr,"[ERR]  Only ipods with 512 bytes per sector are supported.\n");
+        return -1;
+    }
+
+    /* Firstly zero the entire MBR */
+    memset(sectorbuf, 0, ipod->sector_size);
+
+    /* Now add the partition info */
+    for (i=0; i < 4 ; i++) 
+    {
+        p = sectorbuf + 0x1be + i*16;
+
+        /* Ensure first partition is type 0, and second is 0xb */
+        if (i==0) { type = 0; }
+        else if (i==1) { type = 0xb; }
+        else { type = ipod->pinfo[i].type; }
+
+        put_int32le(type, p + 4);
+        put_int32le(ipod->pinfo[i].start, p + 8);
+        put_int32le(ipod->pinfo[i].size, p + 12);
+    }
+
+    /* Finally add the magic */
+    sectorbuf[0x1fe] = 0x55;
+    sectorbuf[0x1ff] = 0xaa;
+
+    if (ipod_seek(ipod, 0) < 0) {
+        fprintf(stderr,"[ERR]  Seek failed writing MBR\n");
+        return -1;
+    }
+
+    /* Write MBR */
+    if ((n = ipod_write(ipod, sectorbuf, ipod->sector_size)) < 0) {
+        perror("[ERR]  Write failed\n");
+        return -1;
+    }
+
+    return 0;
+}

rbutil/ipodpatcher/ipodpatcher.h

@@ -46,6 +46,7 @@ int read_directory(struct ipod_t* ipod);
 int list_images(struct ipod_t* ipod);
 int getmodel(struct ipod_t* ipod, int ipod_version);
 int ipod_scan(struct ipod_t* ipod);
+int write_dos_partition_table(struct ipod_t* ipod);
 off_t filesize(int fd);
 
 #endif

rbutil/ipodpatcher/main.c

@@ -47,7 +47,8 @@ enum {
    WRITE_FIRMWARE,
    READ_PARTITION,
    WRITE_PARTITION,
-   FORMAT_PARTITION
+   FORMAT_PARTITION,
+   CONVERT_TO_FAT32
 };
 
 void print_macpod_warning(void)
@@ -87,6 +88,7 @@ void print_usage(void)
     fprintf(stderr,"  -ab,  --add-bootloader-bin filename.bin\n");
     fprintf(stderr,"  -d,   --delete-bootloader\n");
     fprintf(stderr,"  -f,   --format\n");
+    fprintf(stderr,"  -c,   --convert\n");
     fprintf(stderr,"\n");
 
 #ifdef __WIN32__
@@ -118,11 +120,11 @@ void display_partinfo(struct ipod_t* ipod)
         if (ipod->pinfo[i].start != 0) {
             printf("[INFO]    %d      %10ld    %10ld  %10.1f   %s (0x%02x)\n",
                    i,
-                   ipod->pinfo[i].start,
+                   (long int)ipod->pinfo[i].start,
-                   ipod->pinfo[i].start+ipod->pinfo[i].size-1,
+                   (long int)ipod->pinfo[i].start+ipod->pinfo[i].size-1,
                    ipod->pinfo[i].size/sectors_per_MB,
                    get_parttype(ipod->pinfo[i].type),
-                   ipod->pinfo[i].type);
+                   (int)ipod->pinfo[i].type);
         }
     }
 }
@@ -297,6 +299,10 @@ int main(int argc, char* argv[])
                    (strcmp(argv[i],"--format")==0)) {
             action = FORMAT_PARTITION;
             i++;
+        } else if ((strcmp(argv[i],"-c")==0) || 
+                   (strcmp(argv[i],"--convert")==0)) {
+            action = CONVERT_TO_FAT32;
+            i++;
         } else {
             print_usage(); return 1;
         }
@@ -470,8 +476,9 @@ int main(int argc, char* argv[])
 
         close(infile);
     } else if (action==FORMAT_PARTITION) {
-        printf("WARNING!!! YOU ARE ABOUT TO USE AN EXPERIMENTAL FORMATTING FEATURE.\n");
+        printf("WARNING!!! YOU ARE ABOUT TO USE AN EXPERIMENTAL FEATURE.\n");
-        printf("Are you sure you want to continue? (y/n):");
+        printf("ALL DATA ON YOUR IPOD WILL BE ERASED.\n");
+        printf("Are you sure you want to format your ipod? (y/n):");
         
         if (fgets(yesno,4,stdin)) {
             if (yesno[0]=='y') {
@@ -486,6 +493,32 @@ int main(int argc, char* argv[])
                 fprintf(stderr,"[INFO] Format cancelled.\n");
             }
         }
+    } else if (action==CONVERT_TO_FAT32) {
+        if (!ipod.macpod) {
+            printf("[ERR]  Ipod is already FAT32, aborting\n");
+        } else {
+            printf("WARNING!!! YOU ARE ABOUT TO USE AN EXPERIMENTAL FEATURE.\n");
+            printf("ALL DATA ON YOUR IPOD WILL BE ERASED.\n");
+            printf("Are you sure you want to convert your ipod to FAT32? (y/n):");
+        
+            if (fgets(yesno,4,stdin)) {
+                if (yesno[0]=='y') {
+                    if (ipod_reopen_rw(&ipod) < 0) {
+                        return 5;
+                    }
+
+                    if (write_dos_partition_table(&ipod) < 0) {
+                        fprintf(stderr,"[ERR]  Partition conversion failed.\n");
+                    }
+
+                    if (format_partition(&ipod,1) < 0) {
+                        fprintf(stderr,"[ERR]  Format failed.\n");
+                    }
+                } else {
+                    fprintf(stderr,"[INFO] Format cancelled.\n");
+                }
+            }
+        }
     }
 
     ipod_close(&ipod);