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DiscIO: Add a Volume::ReadSwappedAndShifted function

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This is a fairly common operation, so let's make a utility
function for it to cut down on code duplication.
This commit is contained in:
JosJuice
2017-06-07 11:49:34 +02:00
parent a8e4a3c915
commit 5e3c98af1d
7 changed files with 42 additions and 39 deletions
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22
Source/Core/DiscIO/VolumeWii.cpp
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@ -52,22 +52,22 @@ VolumeWii::VolumeWii(std::unique_ptr<BlobReader> reader)
if (!number_of_partitions)
continue;
std::optional<u32> read_buffer =
m_pReader->ReadSwapped<u32>(0x40000 + (partition_group * 8) + 4);
if (!read_buffer)
const std::optional<u64> partition_table_offset =
ReadSwappedAndShifted(0x40000 + (partition_group * 8) + 4, PARTITION_NONE);
if (!partition_table_offset)
continue;
const u64 partition_table_offset = static_cast<u64>(*read_buffer) << 2;
for (u32 i = 0; i < number_of_partitions; i++)
{
read_buffer = m_pReader->ReadSwapped<u32>(partition_table_offset + (i * 8));
if (!read_buffer)
const std::optional<u64> partition_offset =
ReadSwappedAndShifted(*partition_table_offset + (i * 8), PARTITION_NONE);
if (!partition_offset)
continue;
const u64 partition_offset = static_cast<u64>(*read_buffer) << 2;
const Partition partition(partition_offset);
const Partition partition(*partition_offset);
const std::optional<u32> partition_type =
m_pReader->ReadSwapped<u32>(partition_table_offset + (i * 8) + 4);
m_pReader->ReadSwapped<u32>(*partition_table_offset + (i * 8) + 4);
if (!partition_type)
continue;
@ -84,10 +84,10 @@ VolumeWii::VolumeWii(std::unique_ptr<BlobReader> reader)
auto get_tmd = [this, partition]() -> IOS::ES::TMDReader {
const std::optional<u32> tmd_size = m_pReader->ReadSwapped<u32>(partition.offset + 0x2a4);
std::optional<u32> tmd_address = m_pReader->ReadSwapped<u32>(partition.offset + 0x2a8);
const std::optional<u64> tmd_address =
ReadSwappedAndShifted(partition.offset + 0x2a8, PARTITION_NONE);
if (!tmd_size || !tmd_address)
return INVALID_TMD;
*tmd_address <<= 2;
if (!IOS::ES::IsValidTMDSize(*tmd_size))
{
// This check is normally done by ES in ES_DiVerify, but that would happen too late