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Common/CDImage: Changes to support CHD interfaces

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This commit is contained in:
Connor McLaughlin
2020-01-30 15:50:00 +10:00
parent b5901fa190
commit 18d5086e4c
4 changed files with 88 additions and 41 deletions
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27
src/common/cd_image_bin.cpp
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@ -14,8 +14,12 @@ public:
bool ReadSubChannelQ(SubChannelQ* subq) override;
protected:
bool ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index) override;
private:
std::FILE* m_fp = nullptr;
u64 m_file_position = 0;
CDSubChannelReplacement m_sbi;
};
@ -78,7 +82,7 @@ bool CDImageBin::Open(const char* filename)
// Data index.
Index data_index = {};
data_index.file = m_fp;
data_index.file_index = 0;
data_index.file_offset = 0;
data_index.file_sector_size = track_sector_size;
data_index.start_lba_on_disc = pregap_index.length;
@ -107,6 +111,27 @@ bool CDImageBin::ReadSubChannelQ(SubChannelQ* subq)
return CDImage::ReadSubChannelQ(subq);
}
bool CDImageBin::ReadSectorFromIndex(void* buffer, const Index& index, LBA lba_in_index)
{
const u64 file_position = index.file_offset + (static_cast<u64>(lba_in_index) * index.file_sector_size);
if (m_file_position != file_position)
{
if (std::fseek(m_fp, static_cast<long>(file_position), SEEK_SET) != 0)
return false;
m_file_position = file_position;
}
if (std::fread(buffer, index.file_sector_size, 1, m_fp) != 1)
{
std::fseek(m_fp, static_cast<long>(m_file_position), SEEK_SET);
return false;
}
m_file_position += index.file_sector_size;
return true;
}
std::unique_ptr<CDImage> CDImage::OpenBinImage(const char* filename)
{
std::unique_ptr<CDImageBin> image = std::make_unique<CDImageBin>();