110 lines
2.3 KiB
C++
110 lines
2.3 KiB
C++
//
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// EuropaTools
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//
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// (C) 2021-2022 modeco80 <lily.modeco80@protonmail.ch>
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//
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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#ifndef EUROPA_STRUCTS_PAK_H
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#define EUROPA_STRUCTS_PAK_H
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#include <cstdint>
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#include <cstring>
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#include <europa/structs/ImHexAdapter.hpp>
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namespace europa::structs {
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struct [[gnu::packed]] PakHeader {
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constexpr static const char VALID_MAGIC[16] = "Europa Packfile";
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enum class Version : u16 {
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Ver4 = 0x4,
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Ver5 = 0x5
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};
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char magic[16]; // "Europa Packfile\0"
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/**
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* Header size. Doesn't include the magic.
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*/
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u16 headerSize;
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Version version;
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u8 pad;
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u32 tocOffset;
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u32 tocSize;
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u32 fileCount;
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u32 creationUnixTime;
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// Zeroes.
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u32 reservedPad;
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/**
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* Get the real header size (including the magic).
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*/
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[[nodiscard]] constexpr std::size_t RealHeaderSize() const {
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return sizeof(magic) + static_cast<std::size_t>(headerSize);
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}
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/**
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* Initialize this header (used when writing).
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*/
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void Init(Version ver) noexcept {
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// clear any junk
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memset(this, 0, sizeof(PakHeader));
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// Copy important things.
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std::memcpy(&magic[0], &VALID_MAGIC[0], sizeof(VALID_MAGIC));
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// Set proper header size.
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headerSize = sizeof(PakHeader) - (sizeof(PakHeader::VALID_MAGIC) - 1);
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// Set archive version
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version = ver;
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}
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[[nodiscard]] bool Valid() const noexcept {
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// Magic must match.
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if(std::strcmp(magic, VALID_MAGIC) != 0)
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return false;
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// Check header size.
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if(headerSize != sizeof(PakHeader) - (sizeof(PakHeader::VALID_MAGIC) - 1))
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return false;
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using enum Version;
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// Version must match ones we support,
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// otherwise it's invalid.
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switch(version) {
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case Ver4:
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case Ver5:
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return true;
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default:
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return false;
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}
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}
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};
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// A Toc entry (without string. Needs to be read in separately)
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struct [[gnu::packed]] PakTocEntry {
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u32 offset;
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u32 size;
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u32 creationUnixTime;
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};
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static_assert(sizeof(PakHeader) == 0x29, "PakHeader wrong size!!");
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static_assert(sizeof(PakHeader) - (sizeof(PakHeader::VALID_MAGIC) - 1) == 0x1a, "PakHeader::headerSize will be invalid when writing archives.");
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static_assert(sizeof(PakTocEntry) == 0xc, "PakTocEntry wrong size!");
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} // namespace europa::structs
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#endif // EUROPA_STRUCTS_PAK_H
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