CfgUSBLoader/source/partition.c
2015-01-17 10:11:08 +00:00

509 lines
12 KiB
C

// Modified by oggzee
#include <stdio.h>
#include <string.h>
#include <ogcsys.h>
#include <unistd.h>
#include "partition.h"
#include "sdhc.h"
#include "usbstorage.h"
#include "utils.h"
#include "wbfs.h"
#include "libwbfs/libwbfs.h"
#include "ext2.h"
#include "gettext.h"
/* 'partition table' structure */
typedef struct {
/* Zero bytes */
u8 padding[446];
/* Partition table entries */
partitionEntry entries[MAX_PARTITIONS];
// 0x55 0xAA signature
u8 sig_55aa[2];
} ATTRIBUTE_PACKED partitionTable;
// total size = 512
s32 Partition_GetEntries(u32 device, partitionEntry *outbuf, u32 *outval)
{
static partitionTable table ATTRIBUTE_ALIGN(32);
u32 cnt, sector_size;
s32 ret;
/* Read from specified device */
switch (device) {
case WBFS_DEVICE_USB: {
/* Get sector size */
ret = USBStorage_GetCapacity(&sector_size);
if (ret == 0)
return -1;
/* Read partition table */
u8* table_buf = memalign(32, sector_size);
ret = USBStorage_ReadSectors(0, 1, table_buf);
memcpy(&table, table_buf, sizeof(table));
SAFE_FREE(table_buf);
if (ret < 0)
return ret;
break;
}
case WBFS_DEVICE_SDHC: {
/* SDHC sector size */
sector_size = SDHC_SECTOR_SIZE;
/* Read partition table */
ret = SDHC_ReadSectors(0, 1, &table);
if (!ret)
return -1;
break;
}
default:
return -1;
}
/* Swap endianess */
for (cnt = 0; cnt < 4; cnt++) {
partitionEntry *entry = &table.entries[cnt];
entry->sector = swap32(entry->sector);
entry->size = swap32(entry->size);
}
/* Set partition entries */
memcpy(outbuf, table.entries, sizeof(table.entries));
/* Set sector size */
*outval = sector_size;
return 0;
}
bool Device_ReadSectors(u32 device, u32 sector, u32 count, void *buffer)
{
s32 ret;
/* Read from specified device */
switch (device) {
case WBFS_DEVICE_USB:
ret = USBStorage_ReadSectors(sector, count, buffer);
if (ret < 0)
return false;
return true;
case WBFS_DEVICE_SDHC:
return SDHC_ReadSectors(sector, count, buffer);
}
return false;
}
bool Device_WriteSectors(u32 device, u32 sector, u32 count, void *buffer)
{
s32 ret;
/* Read from specified device */
switch (device) {
case WBFS_DEVICE_USB:
ret = USBStorage_WriteSectors(sector, count, buffer);
if (ret < 0)
return false;
return true;
case WBFS_DEVICE_SDHC:
return SDHC_WriteSectors(sector, count, buffer);
}
return false;
}
int is_valid_ptable(partitionTable *table)
{
int i, n;
partitionEntry *entry = &table->entries[0];
// check if there is something that looks like a partition table
n = 0;
for (i=0; i<4; i++) {
// boot (status) has to be 0 or 0x80
if (entry[i].boot != 0 && entry[i].boot != 0x80) return 0;
// check if partition used
if (entry[i].type == 0) continue;
n++;
// type has to be between 0-0x27 or 0x80-0xff
if (entry[i].type > 0x27 && entry[i].type < 0x80) return 0;
// used partition start and size have to be > 0
if (entry[i].start == 0 || entry[i].size == 0) return 0;
}
// there must be at least 1 valid partition
if (n == 0) return 0;
// all ok, looks like we have a partition table
return 1;
}
s32 Partition_GetEntriesEx(u32 device, partitionEntry *outbuf, u32 *psect_size, int *num)
{
static union {
u8 buf[4096];
partitionTable table;
wbfs_head_t head;
} tbl ATTRIBUTE_ALIGN(32);
partitionTable *table = &tbl.table;
partitionEntry *entry;
u32 i, sector_size;
s32 ret;
int maxpart = *num;
int is_raw = 0;
// Get sector size
switch (device) {
case WBFS_DEVICE_USB:
ret = USBStorage_GetCapacity(&sector_size);
if (ret == 0) return -1;
break;
case WBFS_DEVICE_SDHC:
sector_size = SDHC_SECTOR_SIZE;
break;
default:
return -1;
}
/* Set sector size */
*psect_size = sector_size;
if (sector_size < 512 || sector_size > 4096) {
printf("ERROR: sector size: %u\n", sector_size);
sleep(5);
return -2;
}
u32 ext = 0;
u32 next = 0;
// Read partition table
ret = Device_ReadSectors(device, 0, 1, tbl.buf);
if (!ret) return -1;
// Check if it's a RAW FS disc, without partition table
ret = get_fs_type(table);
dbg_printf("fstype(%d)=%d\n", device, ret);
if (ret != PART_FS_UNK) {
// looks like a raw fs
if (!is_valid_ptable(table)) {
// if invalid part. table then yes it's raw
is_raw = 1;
} else {
dbg_printf("WARNING: ambiguous part.table!\n", ret);
// ambiguous: looks like a raw fs and a valid part. table
// make a decision based on device type
// sd: assume raw; usb: assume part. table
if (device == WBFS_DEVICE_SDHC) {
is_raw = 1;
}
}
}
if (is_raw) {
dbg_printf("RAW\n", ret);
memset(outbuf, 0, sizeof(table->entries));
// create a fake partition entry
if (ret == PART_FS_WBFS) {
wbfs_head_t *head = &tbl.head;
outbuf->size = wbfs_ntohl(head->n_hd_sec);
} else {
outbuf->size = 1;
}
if (ret == PART_FS_NTFS) {
outbuf->type = 0x07;
} else {
outbuf->type = 0x0b;
}
*num = 1;
return 0;
}
/* Swap endianess */
for (i = 0; i < 4; i++) {
entry = &table->entries[i];
entry->sector = swap32(entry->sector);
entry->size = swap32(entry->size);
if (!ext && part_is_extended(entry->type)) {
ext = entry->sector;
}
}
/* Set partition entries */
memcpy(outbuf, table->entries, sizeof(table->entries));
// num primary
*num = 4;
if (!ext) return 0;
next = ext;
// scan extended partition for logical
for(i=0; i<maxpart-4; i++) {
ret = Device_ReadSectors(device, next, 1, tbl.buf);
if (!ret) break;
if (i == 0) {
// handle the invalid scenario where wbfs is on an EXTENDED
// partition instead of on the Logical inside Extended.
if (get_fs_type(table) == PART_FS_WBFS) break;
}
entry = &table->entries[0];
entry->sector = swap32(entry->sector);
entry->size = swap32(entry->size);
if (entry->type && entry->size && entry->sector) {
// rebase to abolute address
entry->sector += next;
// add logical
memcpy(&outbuf[*num], entry, sizeof(*entry));
(*num)++;
// get next
entry++;
if (entry->type && entry->size && entry->sector) {
next = ext + swap32(entry->sector);
} else {
break;
}
}
}
return 0;
}
bool part_is_extended(int type)
{
if (type == 0x05) return true;
if (type == 0x0f) return true;
return false;
}
bool part_is_data(int type)
{
if (type && !part_is_extended(type)) return true;
return false;
}
bool part_valid_data(partitionEntry *entry)
{
if (entry->size && entry->type && entry->sector) {
return part_is_data(entry->type);
}
return false;
}
char* part_type_data(int type)
{
switch (type) {
case 0x01: return "FAT12";
case 0x04: return "FAT16";
case 0x06: return "FAT16"; // FAT16+
case 0x07: return "NTFS";
case 0x0b: return "FAT32";
case 0x0c: return "FAT32";
case 0x0e: return "FAT16";
case 0x82: return "LxSWP";
case 0x83: return "LINUX";
case 0x8e: return "LxLVM";
case 0xa8: return "OSX";
case 0xab: return "OSXBT";
case 0xaf: return "OSXHF";
case 0xe8: return "LUKS";
}
return NULL;
}
const char *part_type_name(int type)
{
static char unk[8];
if (type == 0) return gt("UNUSED");
if (part_is_extended(type)) return gt("EXTEND");
char *p = part_type_data(type);
if (p) return p;
sprintf(unk, "UNK-%02x", type);
return unk;
}
int get_fs_type(void *buff)
{
char *buf = buff;
// WBFS
wbfs_head_t *head = (wbfs_head_t *)buff;
if (head->magic == wbfs_htonl(WBFS_MAGIC)) return PART_FS_WBFS;
// 55AA
if (buf[0x1FE] == 0x55 && buf[0x1FF] == 0xAA) {
// FAT
if (memcmp(buf+0x36,"FAT",3) == 0) return PART_FS_FAT; //FAT16;
if (memcmp(buf+0x52,"FAT",3) == 0) return PART_FS_FAT; //FAT32;
// NTFS
if (memcmp(buf+0x03,"NTFS",4) == 0) return PART_FS_NTFS;
}
return PART_FS_UNK;
}
bool is_type_fat(int type)
{
//return (type == PART_FS_FAT16 || type == PART_FS_FAT32);
return (type == PART_FS_FAT);
}
char *get_fs_name(int i)
{
switch (i) {
case PART_FS_WBFS: return "WBFS";
case PART_FS_FAT: return "FAT";
case PART_FS_NTFS: return "NTFS";
case PART_FS_EXT: return "EXT";
}
return "UNK";
}
s32 Partition_GetList(u32 device, PartList *plist)
{
partitionEntry *entry = NULL;
PartInfo *pinfo = NULL;
int i, ret;
int linux_found = 0;
memset(plist, 0, sizeof(PartList));
// Get partition entries
plist->num = MAX_PARTITIONS_EX;
ret = Partition_GetEntriesEx(device, plist->pentry, &plist->sector_size, &plist->num);
if (ret < 0) {
return -1;
}
char buf[plist->sector_size];
dbg_printf("Plist(%d)=%d ss:%u\n", device, plist->num, plist->sector_size);
// scan partitions for filesystem type
for (i = 0; i < plist->num; i++) {
pinfo = &plist->pinfo[i];
entry = &plist->pentry[i];
pinfo->fs_type = PART_FS_UNK;
if (entry->sector || entry->size || entry->type) {
dbg_printf("P#%d %u %u %d\n", i,
entry->sector, entry->size, entry->type);
}
if (!entry->size) continue;
if (!entry->type) continue;
if (!entry->sector) {
// RAW partition will start at sector 0
if (plist->num != 1) continue;
}
// even though wrong, it's possible WBFS is on an extended part.
//if (!part_is_data(entry->type)) continue;
if (!Device_ReadSectors(device, entry->sector, 1, buf)) continue;
pinfo->fs_type = get_fs_type(buf);
if (pinfo->fs_type == PART_FS_WBFS) {
// multiple wbfs on sdhc not supported
if (device == WBFS_DEVICE_SDHC && (plist->fs_n[PART_FS_WBFS] > 1 || i > 4)) {
continue;
}
}
if (pinfo->fs_type != PART_FS_UNK) {
plist->fs_n[pinfo->fs_type]++;
pinfo->fs_index = plist->fs_n[pinfo->fs_type];
} else if (entry->type == PART_TYPE_LINUX) {
linux_found = 1;
}
}
// scan for linux ext2fs
if (linux_found) {
const DISC_INTERFACE *io;
sec_t *ext_part;
int j;
if (device == WBFS_DEVICE_SDHC) {
io = &my_io_sdhc_ro;
} else {
io = &my_io_usbstorage_ro;
}
ret = ext2FindPartitions(io, &ext_part);
if (ret > 0 && ext_part) {
for (i = 0; i < plist->num; i++) {
pinfo = &plist->pinfo[i];
entry = &plist->pentry[i];
if (!entry->sector || !entry->size || !entry->type) continue;
if (pinfo->fs_type != PART_FS_UNK) continue;
for (j=0; j<ret; j++) {
if (ext_part[j] == entry->sector) {
pinfo->fs_type = PART_FS_EXT;
plist->fs_n[pinfo->fs_type]++;
pinfo->fs_index = plist->fs_n[pinfo->fs_type];
break;
}
}
}
SAFE_FREE(ext_part);
}
}
return 0;
}
int Partition_FixEXT(u32 device, int part, u32 sec_size)
{
static partitionTable table ATTRIBUTE_ALIGN(32);
int ret;
if (sec_size != 512) return -1;
if (part < 0 || part > 3) return -1;
// Read partition table
ret = Device_ReadSectors(device, 0, 1, &table);
if (!ret) return -1;
if (part_is_extended(table.entries[part].type)) {
table.entries[part].type = 0x0b; // FAT32
ret = Device_WriteSectors(device, 0, 1, &table);
if (!ret) return -1;
return 0;
}
return -1;
}
int PartList_FindFS(PartList *plist, int part_fstype, int seq_i, sec_t *sector)
{
int i;
PartInfo *pinfo = NULL;
dbg_printf("part_find(%d %d)\n");
if (seq_i <= 0) return -2; // index has to start with 1
for (i=0; i<plist->num; i++) {
pinfo = &plist->pinfo[i];
if (pinfo->fs_type == part_fstype && pinfo->fs_index == seq_i) {
goto found;
}
}
// not found
return -1;
found:
if (sector) {
*sector = plist->pentry[i].sector;
}
//dbg_printf("Part found: %u\n", *sector);
return i;
}
int Partition_FindFS(u32 device, int part_fstype, int seq_i, sec_t *sector)
{
int ret;
PartList plist;
//dbg_printf("Part_Find(%d, %d, %d)\n", device, part_fstype, seq_i);
if (seq_i <= 0) return -2; // index has to start with 1
ret = Partition_GetList(device, &plist);
if (ret < 0) return ret;
ret = PartList_FindFS(&plist, part_fstype, seq_i, sector);
if (ret < 0) return ret;
return 0;
}