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[VFS] Fix Stfs GetBlockHash (and simplify it)

This commit is contained in:
Dr. Chat 2018-05-29 23:11:38 -05:00
parent f518ec1b37
commit ef18e9d649
1 changed files with 8 additions and 15 deletions
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23
src/xenia/vfs/devices/stfs_container_device.cc
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@ -439,23 +439,16 @@ size_t StfsContainerDevice::BlockToOffsetEGDF(uint64_t sector) {
StfsContainerDevice::BlockHash StfsContainerDevice::GetBlockHash(
const uint8_t* map_ptr, uint32_t block_index, uint32_t table_offset) {
static const uint32_t table_spacing[] = {
0xAB, 0x718F,
0xFE7DA, // The distance in blocks between tables
0xAC, 0x723A,
0xFD00B, // For when tables are 1 block and when they are 2 blocks
};
uint32_t record = block_index % 0xAA;
uint32_t table_index =
(block_index / 0xAA) * table_spacing[table_size_shift_ * 3 + 0];
if (block_index >= 0xAA) {
table_index += ((block_index / 0x70E4) + 1) << table_size_shift_;
if (block_index >= 0x70E4) {
table_index += 1 << table_size_shift_;
}
}
// This is a bit hacky, but we'll get a pointer to the first block after the
// table and then subtract one sector to land on the table itself.
size_t hash_offset = BlockToOffsetSTFS(
xe::round_up(block_index + 1, kSTFSHashSpacing) - kSTFSHashSpacing);
hash_offset -= bytes_per_sector();
const uint8_t* hash_data = map_ptr + hash_offset;
// table_index += table_offset - (1 << table_size_shift_);
const uint8_t* hash_data = map_ptr + BlockToOffsetSTFS(table_index);
const uint8_t* record_data = hash_data + record * 0x18;
uint32_t info = xe::load_and_swap<uint8_t>(record_data + 0x14);
uint32_t next_block_index = load_uint24_be(record_data + 0x15);