58 lines
2.1 KiB
C++
58 lines
2.1 KiB
C++
#include "./flactooggmappingheader.h"
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#include "../ogg/oggiterator.h"
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#include "../exceptions.h"
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#include <c++utilities/conversion/binaryconversion.h>
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using namespace std;
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using namespace CppUtilities;
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namespace TagParser {
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/*!
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* \class TagParser::FlacToOggMappingHeader
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* \brief The FlacToOggMappingHeader class is a FLAC-to-Ogg mapping header parser.
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* \sa https://xiph.org/flac/ogg_mapping.html
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*/
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/*!
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* \brief Parses the FLAC-to-Ogg mapping header which is read using the specified \a iterator.
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* \remarks The header is assumed to start at the current position of \a iterator.
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*/
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void FlacToOggMappingHeader::parseHeader(OggIterator &iterator)
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{
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// prepare parsing
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constexpr auto idSize = 0x05, mappingHeaderSize = 0x0D, blockHeaderSize = 0x04, streamInfoSize = 0x22;
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char buff[mappingHeaderSize + blockHeaderSize + streamInfoSize - idSize];
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iterator.read(buff, idSize);
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if (*buff != 0x7Fu || BE::toInt<std::uint32_t>(buff + 1) != 0x464C4143u) {
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throw InvalidDataException(); // not FLAC-to-Ogg mapping header
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}
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iterator.read(buff, sizeof(buff));
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// parse FLAC-to-Ogg mapping header
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m_majorVersion = static_cast<std::uint8_t>(*(buff + 0x00));
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m_minorVersion = static_cast<std::uint8_t>(*(buff + 0x01));
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m_headerCount = BE::toInt<std::uint16_t>(buff + 0x02);
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if (BE::toInt<std::uint32_t>(buff + 0x04) != 0x664C6143u) {
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throw InvalidDataException(); // native FLAC signature not present
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}
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// parse "METADATA_BLOCK_HEADER"
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FlacMetaDataBlockHeader header;
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header.parseHeader(std::string_view(buff + mappingHeaderSize - idSize, blockHeaderSize));
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if (header.type() != FlacMetaDataBlockType::StreamInfo) {
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throw InvalidDataException(); // "METADATA_BLOCK_STREAMINFO" expected
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}
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if (header.dataSize() < streamInfoSize) {
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throw TruncatedDataException(); // "METADATA_BLOCK_STREAMINFO" is truncated
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}
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// parse "METADATA_BLOCK_STREAMINFO"
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m_streamInfo.parse(std::string_view(buff + mappingHeaderSize + blockHeaderSize - idSize, streamInfoSize));
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}
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} // namespace TagParser
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