// Modified by oggzee

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

#include "partition_usbloader.h"
#include "sdhc.h"
#include "usbstorage2.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 = USBStorage2_GetCapacity( &sector_size );
                if ( ret == 0 )
                    return -1;

                /* Read partition table */
                ret = USBStorage2_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 = USBStorage2_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 = USBStorage2_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, u8 *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 = USBStorage2_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 * )buff;
    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;
}

int get_part_fs( int fs_type )
{
    switch ( fs_type )
    {
        case FS_TYPE_FAT32: return PART_FS_FAT;
        case FS_TYPE_NTFS: return PART_FS_NTFS;
        case FS_TYPE_WBFS: return PART_FS_WBFS;
        default: return -1;
    }
}

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 = pinfo->index = 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 = pinfo->index = plist->wbfs_n;
        }
        else if ( is_type_fat( pinfo->fs_type ) )
        {
            plist->fat_n++;
            pinfo->fat_i = pinfo->index = plist->fat_n;
        }
        else if ( pinfo->fs_type == FS_TYPE_NTFS )
        {
            plist->ntfs_n++;
            pinfo->ntfs_i = pinfo->index = plist->ntfs_n;
        }
        pinfo->part_fs = get_part_fs( pinfo->fs_type );
    }
    return 0;
}


int Partition_FixEXT( u32 device, u8 part )
{
    static partitionTable table ATTRIBUTE_ALIGN( 32 );
    int ret;

    if ( 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;
}