EuropaTools/include/europa/structs/Pak.h

108 lines
2.2 KiB
C++

//
// EuropaTools
//
// (C) 2021-2022 modeco80 <lily.modeco80@protonmail.ch>
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
#ifndef EUROPA_STRUCTS_PAK_H
#define EUROPA_STRUCTS_PAK_H
#include <europa/structs/ImHexAdapter.h>
#include <cstdint>
#include <cstring>
namespace europa::structs {
enum class PakVersion : u16 {
Starfighter = 0x4,
Ver2 = 0x5
};
struct [[gnu::packed]] PakHeader {
constexpr static const char VALID_MAGIC[16] = "Europa Packfile";
char magic[16]; // "Europa Packfile\0"
/**
* Header size. Doesn't include the magic.
*/
u16 headerSize;
PakVersion version;
u8 pad;
u32 tocOffset;
u32 tocSize;
u32 fileCount;
u32 creationUnixTime;
u32 reservedPad;
/**
* Get the real header size (including the magic).
*/
[[nodiscard]] constexpr std::size_t RealHeaderSize() const {
return sizeof(magic) + static_cast<std::size_t>(headerSize);
}
/**
* Initialize this header (used when writing).
*/
void Init(PakVersion ver) noexcept {
// clear any junk
memset(this, 0, sizeof(PakHeader));
// Copy important things.
std::memcpy(&magic[0], &VALID_MAGIC[0], sizeof(VALID_MAGIC));
// Set proper header size.
headerSize = sizeof(PakHeader) - (sizeof(PakHeader::VALID_MAGIC) - 1);
// Set archive version
version = ver;
}
[[nodiscard]] bool Valid() const noexcept {
// Magic must match.
if(std::strcmp(magic, VALID_MAGIC) != 0)
return false;
using enum PakVersion;
// Version must match ones we support,
// otherwise it's invalid.
switch(version) {
case Starfighter:
case Ver2:
break;
default:
return false;
}
// Header is okay.
return true;
}
};
// A Toc entry (without string. Needs to be read in separately)
struct [[gnu::packed]] PakTocEntry {
u32 offset;
u32 size;
u32 creationUnixTime;
};
static_assert(sizeof(PakHeader) == 0x29, "PakHeader wrong size!!");
static_assert(sizeof(PakHeader) - (sizeof(PakHeader::VALID_MAGIC) - 1) == 0x1a, "PakHeader::headerSize will be invalid when writing archives.");
static_assert(sizeof(PakTocEntry) == 0xc, "PakTocEntry wrong size!");
} // namespace europa::structs
#endif // EUROPA_STRUCTS_PAK_H