92 lines
2.2 KiB
C++
92 lines
2.2 KiB
C++
// Copyright 2023 The LightningBolt Authors
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// SPDX-License-Identifier: MIT
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#include <base/Types.hpp>
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#include <cstring>
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#include <span>
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namespace lightningbolt {
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namespace elf {
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/// Table entry in the ELF. We use this to create file names.
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struct [[gnu::packed]] BoltTableEntry {
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/// Pointer to filename. Should be adjusted
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u32 filenamePtr;
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u16 entryId; // (GID >> 8) | ID
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u16 groupId; // (entryId & 0xff00)
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};
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/// Offsets in the ELF to the table.
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struct BoltTableOffsets {
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u32 usTable;
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};
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/// Convert a address to ELF file offset.
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constexpr u32 AddressToElfFileOffset(u32 address) {
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constexpr u32 LoadAddress = 0x00100000;
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constexpr u32 SectionOffset = 0x80;
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return (address - LoadAddress) + SectionOffset;
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}
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static constexpr BoltTableOffsets BoltTableOffsets = {
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.usTable = AddressToElfFileOffset(0x0033d400)
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};
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} // namespace elf
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struct [[gnu::packed]] BoltGroupEntry {
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u32 unk;
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u32 fileSize;
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u32 fileOffset;
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u32 unk3; // name hash?
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};
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struct [[gnu::packed]] BoltGroupDescriptor {
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u8 unk;
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u8 unk2;
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u8 unk3;
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u8 entryCount;
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u32 groupSize;
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u32 groupOffset;
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// PS2 pointer padding; bolt library stuffs something here
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u32 pad;
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u32 EntryCount() {
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// Special case: 0x0 == 256 entries.
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// I have NO idea why they did it like this,
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// this really seems extra when they could have
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// used a short field in the same exact space.
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if(entryCount == 0x0)
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return 256;
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return entryCount;
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}
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std::span<BoltGroupEntry> Entries(u8* base) { return { std::bit_cast<BoltGroupEntry*>(&base[groupOffset]), EntryCount() }; }
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};
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struct [[gnu::packed]] BoltLibraryHeader {
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static constexpr char VALID_MAGIC[] = "BOLT\r\n";
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char magic[6];
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u8 unk;
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u8 unk2;
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u8 unk3;
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u8 unk4;
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u8 unk5;
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u8 groupCount;
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u32 libSize;
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std::span<BoltGroupDescriptor> GroupDescriptors() {
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// The group descriptors are after the primary library header
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return { std::bit_cast<BoltGroupDescriptor*>(this + 1), groupCount };
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}
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inline bool Validate() const { return !std::memcmp(&magic[0], &VALID_MAGIC[0], sizeof(magic)); }
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};
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} // namespace lightningbolt
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