93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
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// JMMT PAK structures
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#ifndef JMMT_PACKAGE_H
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#define JMMT_PACKAGE_H
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#include <cstdint>
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// for LzssHeader
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#include <jmmt/lzss.h>
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namespace jmmt {
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template <class TMagic, TMagic ValidMagic>
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struct BasicStructureWithMagic {
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constexpr static TMagic TypeMagic = ValidMagic;
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};
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template <uint32_t ValidMagic>
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using FourCCMagic = BasicStructureWithMagic<uint32_t, ValidMagic>;
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// This is the "file header" of sorts.
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struct PackageEofHeader {
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std::uint32_t headerSize;
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std::uint32_t debugInfoSize;
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std::uint32_t headerStartOffset;
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};
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struct PackageGroup : public FourCCMagic<0x50524750 /* 'PGRP' */> {
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uint32_t magic;
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uint32_t groupNameCrc;
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uint32_t fileCount;
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uint32_t padding; // 0xcdcdcdcd - padding to 0x10 bytes
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};
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struct PackageFile : public FourCCMagic<0x4C494650 /* 'PFIL' */> {
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uint32_t magic;
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uint32_t unk[2]; // Don't know what these are?
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// Sequence number of the chunk.
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// This represents the order of each chunk,
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// presumably so order can just be whatever.
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//
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// However, the archives seem to order chunks for files
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// in order, and doesn't start/interleave other files
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// in between of files.
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//
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// In other words: this is a nice waste of 16 bits.
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uint16_t chunkSequenceNumber;
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// Amount of chunks which need to be read
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// from to read this file completely.
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//
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// 1 means this file starts and ends on this chunk.
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uint16_t chunkAmount;
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// A CRC32 hash of the path of this file.
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// Hashed with jmmt::HashString().
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uint32_t filenameCrc;
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uint32_t unk2[7]; // more unknown stuff I don't know about yet
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// Uncompressed size of this file chunk. Has a maximum of 65535 bytes.
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uint32_t chunkSize;
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// Offset where this file chunk should start,
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// inside of a larger buffer.
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uint32_t blockOffset;
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// Compressed (stored) size of this chunk.
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uint32_t compressedChunkSize;
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// Offset inside of the package file where
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// the compressed data blob starts.
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uint32_t dataOffset;
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uint32_t fileSize;
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// TECH LZSS header.
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// Used to (shocker) configure LZSS decompression.
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//
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// Duplicates a few things in the file.
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LzssHeader lzssHeader;
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};
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static_assert(sizeof(PackageEofHeader) == 0xc, "PackageEofHeader has invalid size. Extractor 100% won't work, good job");
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static_assert(sizeof(PackageGroup) == 0x10, "PackageGroup has invalid size, extractor won't work");
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static_assert(sizeof(PackageFile) == 0x64, "PackageFile has invalid size, extractor won't work");
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} // namespace jmmt
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#endif // JMMT_PACKAGE_H
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