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changed fatmounter.c by taking out all the stuff to detect the first FAT partition. Because it is now included in libfat. This file is in our downloads section for people that want it. If you compile a dol/ elf without it, it will have issues seeing FAT usb partitions.

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This commit is contained in:
giantpune 2009-07-02 22:04:47 +00:00
parent 29f9832467
commit 8c076a8eb9
1 changed files with 3 additions and 135 deletions
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138
source/fatmounter.c
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@ -14,147 +14,15 @@
#define CACHE 8
#define SECTORS 64
enum BPB {
BPB_jmpBoot = 0x00,
BPB_OEMName = 0x03,
// BIOS Parameter Block
BPB_bytesPerSector = 0x0B,
BPB_sectorsPerCluster = 0x0D,
BPB_reservedSectors = 0x0E,
BPB_numFATs = 0x10,
BPB_rootEntries = 0x11,
BPB_numSectorsSmall = 0x13,
BPB_mediaDesc = 0x15,
BPB_sectorsPerFAT = 0x16,
BPB_sectorsPerTrk = 0x18,
BPB_numHeads = 0x1A,
BPB_numHiddenSectors = 0x1C,
BPB_numSectors = 0x20,
// Ext BIOS Parameter Block for FAT16
BPB_FAT16_driveNumber = 0x24,
BPB_FAT16_reserved1 = 0x25,
BPB_FAT16_extBootSig = 0x26,
BPB_FAT16_volumeID = 0x27,
BPB_FAT16_volumeLabel = 0x2B,
BPB_FAT16_fileSysType = 0x36,
// Bootcode
BPB_FAT16_bootCode = 0x3E,
// FAT32 extended block
BPB_FAT32_sectorsPerFAT32 = 0x24,
BPB_FAT32_extFlags = 0x28,
BPB_FAT32_fsVer = 0x2A,
BPB_FAT32_rootClus = 0x2C,
BPB_FAT32_fsInfo = 0x30,
BPB_FAT32_bkBootSec = 0x32,
// Ext BIOS Parameter Block for FAT32
BPB_FAT32_driveNumber = 0x40,
BPB_FAT32_reserved1 = 0x41,
BPB_FAT32_extBootSig = 0x42,
BPB_FAT32_volumeID = 0x43,
BPB_FAT32_volumeLabel = 0x47,
BPB_FAT32_fileSysType = 0x52,
// Bootcode
BPB_FAT32_bootCode = 0x5A,
BPB_bootSig_55 = 0x1FE,
BPB_bootSig_AA = 0x1FF
};
static const char FAT_SIG[3] = {'F', 'A', 'T'};
#define BYTES_PER_READ 512
static bool _FAT_partition_isFAT(const DISC_INTERFACE* disc, sec_t startSector)
{
uint8_t sectorBuffer[BYTES_PER_READ] = {0};
if (!disc->readSectors(startSector, 1, sectorBuffer)) {
return false;
}
// Make sure it is a valid BPB
if ( (sectorBuffer[BPB_bootSig_55] != 0x55) || (sectorBuffer[BPB_bootSig_AA] != 0xAA)) {
return false;
}
// Now verify that this is indeed a FAT partition
if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) &&
memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
{
return false;
}
// check again for the last two cases to make sure that we really have a FAT filesystem here
// and won't corrupt any data
if(memcmp(sectorBuffer + BPB_FAT16_fileSysType, "FAT", 3) != 0 && memcmp(sectorBuffer + BPB_FAT32_fileSysType, "FAT32", 5) != 0)
{
return false;
}
return true;
}
static inline uint32_t u8array_to_u32 (const uint8_t* item, int offset) {
return ( item[offset] | (item[offset + 1] << 8) | (item[offset + 2] << 16) | (item[offset + 3] << 24));
}
sec_t GetFATPartition(const DISC_INTERFACE* disc)
{
int i;
uint8_t sectorBuffer[BYTES_PER_READ] = {0};
sec_t startSector = 0;
if(!disc->startup())
return 0;
// Read first sector of disc
if (!disc->readSectors(0, 1, sectorBuffer))
startSector = 0;
// Make sure it is a valid MBR or boot sector
if ( (sectorBuffer[BPB_bootSig_55] != 0x55) || (sectorBuffer[BPB_bootSig_AA] != 0xAA))
startSector = 0;
if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
{
// Check if there is a FAT string, which indicates this is a boot sector
startSector = 0;
}
else if (!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
{
// Check for FAT32
startSector = 0;
}
else
{
// This is an MBR
// Find first valid partition from MBR
// First check for an active partition
for (i=0x1BE; (i < 0x1FE) && (sectorBuffer[i] != 0x80); i+= 0x10);
// If it find an active partition, check for FAT-Partition
if ( i != 0x1FE && !_FAT_partition_isFAT(disc, u8array_to_u32(sectorBuffer, 0x8 + i)) )
i = 0x1FE;
// If it didn't find an active partition, search for any valid partition
if (i == 0x1FE)
{
for (i=0x1BE; i < 0x1FE; i+= 0x10)
{
if ( sectorBuffer[i+0x04] != 0x00 && _FAT_partition_isFAT(disc, u8array_to_u32(sectorBuffer, 0x8 + i)) )
break;
}
}
if (i != 0x1FE)
startSector = u8array_to_u32(sectorBuffer, 0x8 + i);;
}
disc->shutdown();
return startSector;
}
int USBDevice_Init()
{
//closing all open Files write back the cache and then shutdown em!
fatUnmount("USB:/");
//right now mounts first FAT-partition
if (fatMount("USB", &__io_wiiums, GetFATPartition(&__io_wiiums), CACHE, SECTORS)) {
if (fatMount("USB", &__io_wiiums, 0, CACHE, SECTORS)) {
//try first mount with cIOS
return 1;
} else if (fatMount("USB", &__io_usbstorage, GetFATPartition(&__io_usbstorage), CACHE, SECTORS)) {
} else if (fatMount("USB", &__io_usbstorage, 0, CACHE, SECTORS)) {
//try now mount with libogc
return 1;
}
@ -186,7 +54,7 @@ int SDCard_Init()
//closing all open Files write back the cache and then shutdown em!
fatUnmount("SD:/");
//right now mounts first FAT-partition
if (fatMount("SD", &__io_wiisd, GetFATPartition(&__io_wiisd), CACHE, SECTORS))
if (fatMount("SD", &__io_wiisd, 0, CACHE, SECTORS))
return 1;
return -1;
}