usbloadergx/source/usbloader/partition_usbloader.c

// Modified by oggzee

#include <stdio.h>
#include <string.h>
#include <ogcsys.h>
#include <unistd.h>

#include "partition_usbloader.h"
#include "sdhc.h"
#include "usbstorage.h"
#include "utils.h"
#include "wbfs.h"
#include "libwbfs/libwbfs.h"

/* 'partition table' structure */
typedef struct {
	/* Zero bytes */
	u8 padding[446];

	/* Partition table entries */
	partitionEntry entries[MAX_PARTITIONS];
} ATTRIBUTE_PACKED partitionTable;


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 */
		ret = USBStorage_ReadSectors(0, 1, &table);
		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;
}

s32 Partition_GetEntriesEx(u32 device, partitionEntry *outbuf, u32 *psect_size, int *num)
{
	static partitionTable table ATTRIBUTE_ALIGN(32);
	partitionEntry *entry;

	u32 i, sector_size;
	s32 ret;
	int maxpart = *num;

	// 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;

	u32 ext = 0;
	u32 next = 0;

	// Read partition table
	ret = Device_ReadSectors(device, 0, 1, &table);
	if (!ret) return -1;
	// Check if it's a RAW WBFS disc, without partition table
	if (get_fs_type(&table) == FS_TYPE_WBFS) {
		memset(outbuf, 0, sizeof(table.entries));
		wbfs_head_t *head = (wbfs_head_t*)&table;
		outbuf->size = wbfs_ntohl(head->n_hd_sec);
		*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, &table);
		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) == FS_TYPE_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"; //+
		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;
}

char *part_type_name(int type)
{
	static char unk[8];
	if (type == 0) return "UNUSED";
	if (part_is_extended(type)) return "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 *)buf;
	if (head->magic == wbfs_htonl(WBFS_MAGIC)) return FS_TYPE_WBFS;
	// 55AA
	if (buf[0x1FE] == 0x55 && buf[0x1FF] == 0xAA) {
		// FAT
		if (memcmp(buf+0x36,"FAT",3) == 0) return FS_TYPE_FAT16;
		if (memcmp(buf+0x52,"FAT",3) == 0) return FS_TYPE_FAT32;
		// NTFS
		if (memcmp(buf+0x03,"NTFS",4) == 0) return FS_TYPE_NTFS;
	}
	return FS_TYPE_UNK;
}

bool is_type_fat(int type)
{
	return (type == FS_TYPE_FAT16 || type == FS_TYPE_FAT32);
}


char *get_fs_name(int i)
{
	switch (i) {
		case FS_TYPE_FAT16: return "FAT16";
		case FS_TYPE_FAT32: return "FAT32";
		case FS_TYPE_NTFS:  return "NTFS";
		case FS_TYPE_WBFS:  return "WBFS";
	}
	return "";
}

s32 Partition_GetList(u32 device, PartList *plist)
{
	partitionEntry *entry = NULL;
	PartInfo *pinfo = NULL;
	int i, ret;

	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;
	}
	// check for RAW WBFS disc
	if (plist->num == 1) {
		pinfo = &plist->pinfo[0];
		entry = &plist->pentry[0];
		plist->wbfs_n = 1;
		pinfo->wbfs_i = 1;
		return 0;
	}

	char buf[plist->sector_size];

	// scan partitions for filesystem type
	for (i = 0; i < plist->num; i++) {
		pinfo = &plist->pinfo[i];
		entry = &plist->pentry[i];
		if (!entry->size) continue;
		if (!entry->type) continue;
		if (!entry->sector) 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 == FS_TYPE_WBFS) {
			// multiple wbfs on sdhc not supported
			if (device == WBFS_DEVICE_SDHC && (plist->wbfs_n > 1 || i > 4)) continue;
			plist->wbfs_n++;
			pinfo->wbfs_i = plist->wbfs_n;
		} else if (is_type_fat(pinfo->fs_type)) {
			plist->fat_n++;
			pinfo->fat_i = plist->fat_n;
		}
	}
	return 0;
}


int Partition_FixEXT(u32 device, int part)
{
	static partitionTable table ATTRIBUTE_ALIGN(32);
	int ret;

	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;
}