usbloadergx/source/libwbfs/wiidisc.c
giantpune 9e79c9d99b * remove little unused code
* code cleanup
2010-09-18 23:16:05 +00:00

373 lines
10 KiB
C

// Copyright 2009 Kwiirk based on negentig.c:
// Copyright 2007,2008 Segher Boessenkool <segher@kernel.crashing.org>
// Licensed under the terms of the GNU GPL, version 2
// http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt
#include "wiidisc.h"
void aes_set_key( u8 *key );
void aes_decrypt( u8 *iv, u8 *inbuf, u8 *outbuf, unsigned long long len );
static void _decrypt_title_key( u8 *tik, u8 *title_key )
{
u8 common_key[16] =
{
0xeb, 0xe4, 0x2a, 0x22, 0x5e, 0x85, 0x93, 0xe4, 0x48, 0xd9, 0xc5, 0x45,
0x73, 0x81, 0xaa, 0xf7
};;
u8 iv[16];
wbfs_memset( iv, 0, sizeof iv );
wbfs_memcpy( iv, tik + 0x01dc, 8 );
aes_set_key( common_key );
//_aes_cbc_dec(common_key, iv, tik + 0x01bf, 16, title_key);
aes_decrypt( iv, tik + 0x01bf, title_key, 16 );
}
static u32 _be32( const u8 *p )
{
return ( p[0] << 24 ) | ( p[1] << 16 ) | ( p[2] << 8 ) | p[3];
}
static void disc_read( wiidisc_t *d, u32 offset, u8 *data, u32 len )
{
if ( data )
{
int ret = 0;
if ( len == 0 )
return ;
ret = d->read( d->fp, offset, len, data );
if ( ret )
wbfs_fatal( "error reading disc" );
}
if ( d->sector_usage_table )
{
u32 blockno = offset >> 13;
do
{
d->sector_usage_table[blockno] = 1;
blockno += 1;
if ( len > 0x8000 )
len -= 0x8000;
}
while ( len > 0x8000 );
}
}
static void partition_raw_read( wiidisc_t *d, u32 offset, u8 *data, u32 len )
{
disc_read( d, d->partition_raw_offset + offset, data, len );
}
static void partition_read_block( wiidisc_t *d, u32 blockno, u8 *block )
{
u8*raw = d->tmp_buffer;
u8 iv[16];
u32 offset;
if ( d->sector_usage_table )
d->sector_usage_table[d->partition_block+blockno] = 1;
offset = d->partition_data_offset + ( ( 0x8000 >> 2 ) * blockno );
partition_raw_read( d, offset, raw, 0x8000 );
// decrypt data
memcpy( iv, raw + 0x3d0, 16 );
aes_set_key( d->disc_key );
aes_decrypt( iv, raw + 0x400, block, 0x7c00 );
}
static void partition_read( wiidisc_t *d, u32 offset, u8 *data, u32 len, int fake )
{
u8 *block = d->tmp_buffer2;
u32 offset_in_block;
u32 len_in_block;
if ( fake && d->sector_usage_table == 0 )
return;
while ( len )
{
offset_in_block = offset % ( 0x7c00 >> 2 );
len_in_block = 0x7c00 - ( offset_in_block << 2 );
if ( len_in_block > len )
len_in_block = len;
if ( !fake )
{
partition_read_block( d, offset / ( 0x7c00 >> 2 ), block );
wbfs_memcpy( data, block + ( offset_in_block << 2 ), len_in_block );
}
else
d->sector_usage_table[d->partition_block+( offset/( 0x7c00>>2 ) )] = 1;
data += len_in_block;
offset += len_in_block >> 2;
len -= len_in_block;
}
}
static u32 do_fst( wiidisc_t *d, u8 *fst, const char *names, u32 i )
{
u32 offset;
u32 size;
const char *name;
u32 j;
name = names + ( _be32( fst + 12 * i ) & 0x00ffffff );
size = _be32( fst + 12 * i + 8 );
if ( i == 0 )
{
for ( j = 1; j < size && !d->extracted_buffer; )
{
j = do_fst( d, fst, names, j );
}
return size;
}
//printf("name %s\n",name);
if ( fst[12*i] )
{
for ( j = i + 1; j < size && !d->extracted_buffer; )
j = do_fst( d, fst, names, j );
return size;
}
else
{
offset = _be32( fst + 12 * i + 4 );
if ( d->extract_pathname && strcasecmp( name, d->extract_pathname ) == 0 )
{
d->extracted_buffer = wbfs_ioalloc( size );
d->extracted_size = size;
partition_read( d, offset, d->extracted_buffer, size, 0 );
}
else
partition_read( d, offset, 0, size, 1 );
return i + 1;
}
}
static void do_files( wiidisc_t*d )
{
u8 *b = wbfs_ioalloc( 0x480 ); // XXX: determine actual header size
u32 dol_offset;
u32 fst_offset;
u32 fst_size;
u32 apl_offset;
u32 apl_size;
u8 *apl_header = wbfs_ioalloc( 0x20 );
u8 *fst;
u32 n_files;
partition_read( d, 0, b, 0x480, 0 );
dol_offset = _be32( b + 0x0420 );
fst_offset = _be32( b + 0x0424 );
fst_size = _be32( b + 0x0428 ) << 2;
apl_offset = 0x2440 >> 2;
partition_read( d, apl_offset, apl_header, 0x20, 0 );
apl_size = 0x20 + _be32( apl_header + 0x14 ) + _be32( apl_header + 0x18 );
// fake read dol and partition
if ( apl_size )
partition_read( d, apl_offset, 0, apl_size, 1 );
partition_read( d, dol_offset, 0, ( fst_offset - dol_offset ) << 2, 1 );
if ( fst_size )
{
fst = wbfs_ioalloc( fst_size );
if ( fst == 0 )
wbfs_fatal( "malloc fst" );
partition_read( d, fst_offset, fst, fst_size, 0 );
n_files = _be32( fst + 8 );
if ( d->extract_pathname && *d->extract_pathname == 0 )
{
// if empty pathname requested return fst
d->extracted_buffer = fst;
d->extracted_size = fst_size;
d->extract_pathname = NULL;
// skip do_fst if only fst requested
n_files = 0;
}
if ( 12*n_files <= fst_size )
{
if ( n_files > 1 )
do_fst( d, fst, ( char * )fst + 12*n_files, 0 );
}
}
wbfs_iofree( b );
wbfs_iofree( apl_header );
if ( fst != d->extracted_buffer )
wbfs_iofree( fst );
}
static void do_partition( wiidisc_t*d )
{
u8 *tik = wbfs_ioalloc( 0x2a4 );
u8 *b = wbfs_ioalloc( 0x1c );
u64 tmd_offset;
u32 tmd_size;
u8 *tmd;
u64 cert_offset;
u32 cert_size;
u8 *cert;
u64 h3_offset;
// read ticket, and read some offsets and sizes
partition_raw_read( d, 0, tik, 0x2a4 );
partition_raw_read( d, 0x2a4 >> 2, b, 0x1c );
tmd_size = _be32( b );
tmd_offset = _be32( b + 4 );
cert_size = _be32( b + 8 );
cert_offset = _be32( b + 0x0c );
h3_offset = _be32( b + 0x10 );
d->partition_data_offset = _be32( b + 0x14 );
d->partition_block = ( d->partition_raw_offset + d->partition_data_offset ) >> 13;
tmd = wbfs_ioalloc( tmd_size );
if ( tmd == 0 )
wbfs_fatal( "malloc tmd" );
partition_raw_read( d, tmd_offset, tmd, tmd_size );
cert = wbfs_ioalloc( cert_size );
if ( cert == 0 )
wbfs_fatal( "malloc cert" );
partition_raw_read( d, cert_offset, cert, cert_size );
_decrypt_title_key( tik, d->disc_key );
partition_raw_read( d, h3_offset, 0, 0x18000 );
wbfs_iofree( b );
wbfs_iofree( tik );
wbfs_iofree( cert );
wbfs_iofree( tmd );
do_files( d );
}
static int test_parition_skip( u32 partition_type, partition_selector_t part_sel )
{
switch ( part_sel )
{
case ALL_PARTITIONS:
return 0;
case REMOVE_UPDATE_PARTITION:
return ( partition_type == 1 );
case ONLY_GAME_PARTITION:
return ( partition_type != 0 );
default:
return ( partition_type != part_sel );
}
}
static void do_disc( wiidisc_t*d )
{
u8 *b = wbfs_ioalloc( 0x100 );
u64 partition_offset[32]; // XXX: don't know the real maximum
u64 partition_type[32]; // XXX: don't know the real maximum
u32 n_partitions;
u32 magic;
u32 i;
disc_read( d, 0, b, 0x100 );
magic = _be32( b + 24 );
if ( magic != 0x5D1C9EA3 )
{
wbfs_error( "not a wii disc" );
return ;
}
disc_read( d, 0x40000 >> 2, b, 0x100 );
n_partitions = _be32( b );
disc_read( d, _be32( b + 4 ), b, 0x100 );
for ( i = 0; i < n_partitions; i++ )
{
partition_offset[i] = _be32( b + 8 * i );
partition_type[i] = _be32( b + 8 * i + 4 );
}
for ( i = 0; i < n_partitions; i++ )
{
d->partition_raw_offset = partition_offset[i];
if ( !test_parition_skip( partition_type[i], d->part_sel ) )
do_partition( d );
}
wbfs_iofree( b );
}
wiidisc_t *wd_open_disc( read_wiidisc_callback_t read, void*fp )
{
wiidisc_t *d = wbfs_malloc( sizeof( wiidisc_t ) );
if ( !d )
return 0;
wbfs_memset( d, 0, sizeof( wiidisc_t ) );
d->read = read;
d->fp = fp;
d->part_sel = ALL_PARTITIONS;
d->tmp_buffer = wbfs_ioalloc( 0x8000 );
d->tmp_buffer2 = wbfs_malloc( 0x8000 );
return d;
}
void wd_close_disc( wiidisc_t *d )
{
wbfs_iofree( d->tmp_buffer );
wbfs_free( d->tmp_buffer2 );
wbfs_free( d );
}
// returns a buffer allocated with wbfs_ioalloc() or NULL if not found of alloc error
// XXX pathname not implemented. files are extracted by their name.
// first file found with that name is returned.
u8 * wd_extract_file( wiidisc_t *d, partition_selector_t partition_type, char *pathname )
{
u8 *retval = 0;
d->extract_pathname = pathname;
d->extracted_buffer = 0;
d->part_sel = partition_type;
do_disc( d );
d->extract_pathname = 0;
d->part_sel = ALL_PARTITIONS;
retval = d->extracted_buffer;
d->extracted_buffer = 0;
return retval;
}
void wd_build_disc_usage( wiidisc_t *d, partition_selector_t selector, u8* usage_table )
{
d->sector_usage_table = usage_table;
wbfs_memset( usage_table, 0, 143432*2 );
d->part_sel = selector;
do_disc( d );
d->part_sel = ALL_PARTITIONS;
d->sector_usage_table = 0;
}
void wd_fix_partition_table( wiidisc_t *d, partition_selector_t selector, u8* partition_table )
{
u8 *b = partition_table;
u32 partition_offset;
u32 partition_type;
u32 n_partitions, i, j;
u32 *b32;
if ( selector == ALL_PARTITIONS )
return;
n_partitions = _be32( b );
if ( _be32( b + 4 ) - ( 0x40000 >> 2 ) > 0x50 )
wbfs_fatal( "cannot modify this partition table. Please report the bug." );
b += ( _be32( b + 4 ) - ( 0x40000 >> 2 ) ) * 4;
j = 0;
for ( i = 0; i < n_partitions; i++ )
{
partition_offset = _be32( b + 8 * i );
partition_type = _be32( b + 8 * i + 4 );
if ( !test_parition_skip( partition_type, selector ) )
{
b32 = ( u32* )( b + 8 * j );
b32[0] = wbfs_htonl( partition_offset );
b32[1] = wbfs_htonl( partition_type );
j++;
}
}
b32 = ( u32* )( partition_table );
*b32 = wbfs_htonl( j );
}