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/*
* OggStream.h
* -----------
* Purpose: Basic Ogg stream parsing functionality
* Notes : (currently none)
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#pragma once
#include "openmpt/all/BuildSettings.hpp"
#include "openmpt/base/Endian.hpp"
#include "mpt/io/io.hpp"
#include "../common/FileReaderFwd.h"
OPENMPT_NAMESPACE_BEGIN
namespace Ogg
{
struct PageHeader
{
char capture_pattern[4]; // "OggS"
uint8le version;
uint8le header_type;
uint64le granule_position;
uint32le bitstream_serial_number;
uint32le page_sequence_number;
uint32le CRC_checksum;
uint8le page_segments;
};
MPT_BINARY_STRUCT(PageHeader, 27)
struct PageInfo
{
PageHeader header;
uint8 segment_table[255];
PageInfo()
{
MemsetZero(header);
MemsetZero(segment_table);
}
uint16 GetPagePhysicalSize() const;
uint16 GetPageHeaderSize() const;
uint16 GetPageDataSize() const;
};
// returns false on EOF
bool AdvanceToPageMagic(FileCursor &file);
bool ReadPage(FileCursor &file, PageInfo &pageInfo, std::vector<uint8> *pageData = nullptr);
bool ReadPage(FileCursor &file, PageInfo &pageInfo, std::vector<uint8> &pageData);
bool ReadPage(FileCursor &file);
bool ReadPageAndSkipJunk(FileCursor &file, PageInfo &pageInfo, std::vector<uint8> &pageData);
bool UpdatePageCRC(PageInfo &pageInfo, const std::vector<uint8> &pageData);
template <typename Tfile>
bool WritePage(Tfile & f, const PageInfo &pageInfo, const std::vector<uint8> &pageData)
{
if(!mpt::IO::Write(f, pageInfo.header))
{
return false;
}
if(!mpt::IO::WriteRaw(f, pageInfo.segment_table, pageInfo.header.page_segments))
{
return false;
}
if(!mpt::IO::WriteRaw(f, pageData.data(), pageData.size()))
{
return false;
}
return true;
}
} // namespace Ogg
OPENMPT_NAMESPACE_END
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