mirror of
https://github.com/Ninjdai1/pokeemerald.git
synced 2024-12-27 20:24:18 +01:00
273 lines
7.6 KiB
C++
273 lines
7.6 KiB
C++
#include <cstdio>
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#include <cstring>
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#include <cstdint>
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#include <map>
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#include <vector>
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#include <string>
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#include "ramscrgen.h"
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#include "elf.h"
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#define SHN_COMMON 0xFFF2
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static std::string s_elfPath;
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static std::string s_archiveFilePath;
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static std::string s_archiveObjectPath;
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static FILE *s_file;
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static std::uint32_t s_sectionHeaderOffset;
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static int s_sectionHeaderEntrySize;
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static int s_sectionCount;
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static int s_shstrtabIndex;
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static std::uint32_t s_symtabOffset;
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static std::uint32_t s_strtabOffset;
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static std::uint32_t s_symbolCount;
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static std::uint32_t s_elfFileOffset;
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struct Symbol
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{
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std::uint32_t nameOffset;
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std::uint32_t size;
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};
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static void Seek(long offset)
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{
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if (std::fseek(s_file, s_elfFileOffset + offset, SEEK_SET) != 0)
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FATAL_ERROR("error: failed to seek to %ld in \"%s\"", offset, s_elfPath.c_str());
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}
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static void Skip(long offset)
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{
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if (std::fseek(s_file, offset, SEEK_CUR) != 0)
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FATAL_ERROR("error: failed to skip %ld bytes in \"%s\"", offset, s_elfPath.c_str());
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}
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static std::uint32_t ReadInt8()
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{
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int c = std::fgetc(s_file);
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if (c < 0)
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FATAL_ERROR("error: unexpected EOF when reading ELF file \"%s\"\n", s_elfPath.c_str());
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return c;
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}
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static std::uint32_t ReadInt16()
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{
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std::uint32_t val = 0;
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val |= ReadInt8();
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val |= ReadInt8() << 8;
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return val;
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}
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static std::uint32_t ReadInt32()
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{
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std::uint32_t val = 0;
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val |= ReadInt8();
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val |= ReadInt8() << 8;
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val |= ReadInt8() << 16;
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val |= ReadInt8() << 24;
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return val;
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}
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static std::string ReadString()
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{
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std::string s;
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char c;
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while ((c = ReadInt8()) != 0)
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s += c;
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return s;
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}
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static void VerifyElfIdent()
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{
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char expectedMagic[4] = { 0x7F, 'E', 'L', 'F' };
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char magic[4];
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if (std::fread(magic, 4, 1, s_file) != 1)
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FATAL_ERROR("error: failed to read ELF magic from \"%s\"\n", s_elfPath.c_str());
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if (std::memcmp(magic, expectedMagic, 4) != 0)
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FATAL_ERROR("error: ELF magic did not match in \"%s\"\n", s_elfPath.c_str());
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if (std::fgetc(s_file) != 1)
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FATAL_ERROR("error: \"%s\" not 32-bit ELF\n", s_elfPath.c_str());
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if (std::fgetc(s_file) != 1)
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FATAL_ERROR("error: \"%s\" not little-endian ELF\n", s_elfPath.c_str());
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}
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static void VerifyAr()
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{
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char expectedMagic[8] = {'!', '<', 'a', 'r', 'c', 'h', '>', '\n'};
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char magic[8];
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if (std::fread(magic, 8, 1, s_file) != 1)
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FATAL_ERROR("error: failed to read AR magic from \"%s\"\n", s_archiveFilePath.c_str());
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if (std::memcmp(magic, expectedMagic, 8) != 0)
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FATAL_ERROR("error: AR magic did not match in \"%s\"\n", s_archiveFilePath.c_str());
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}
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static void ReadElfHeader()
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{
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Seek(0x20);
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s_sectionHeaderOffset = ReadInt32();
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Seek(0x2E);
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s_sectionHeaderEntrySize = ReadInt16();
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s_sectionCount = ReadInt16();
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s_shstrtabIndex = ReadInt16();
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}
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static void FindArObj()
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{
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char file_ident[17] = {0};
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char filesize_s[11] = {0};
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char expectedEndMagic[2] = { 0x60, 0x0a };
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char end_magic[2];
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std::size_t filesize;
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Seek(8);
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while (!std::feof(s_file)) {
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if (std::fread(file_ident, 16, 1, s_file) != 1)
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FATAL_ERROR("error: failed to read file ident in \"%s\"\n", s_archiveFilePath.c_str());
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Skip(32);
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if (std::fread(filesize_s, 10, 1, s_file) != 1)
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FATAL_ERROR("error: failed to read filesize in \"%s\"\n", s_archiveFilePath.c_str());
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if (std::fread(end_magic, 2, 1, s_file) != 1)
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FATAL_ERROR("error: failed to read end sentinel in \"%s\"\n", s_archiveFilePath.c_str());
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if (std::memcmp(end_magic, expectedEndMagic, 2) != 0)
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FATAL_ERROR("error: corrupted archive header in \"%s\" at \"%s\"\n", s_archiveFilePath.c_str(), file_ident);
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char * ptr = std::strchr(file_ident, '/');
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if (ptr != nullptr)
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*ptr = 0;
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filesize = std::strtoul(filesize_s, nullptr, 10);
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if (std::strncmp(s_archiveObjectPath.c_str(), file_ident, 16) == 0) {
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s_elfFileOffset = std::ftell(s_file);
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return;
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}
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Skip(filesize);
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}
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FATAL_ERROR("error: could not find object \"%s\" in archive \"%s\"\n", s_archiveObjectPath.c_str(), s_archiveFilePath.c_str());
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}
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static std::string GetSectionName(std::uint32_t shstrtabOffset, int index)
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{
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Seek(s_sectionHeaderOffset + s_sectionHeaderEntrySize * index);
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std::uint32_t nameOffset = ReadInt32();
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Seek(shstrtabOffset + nameOffset);
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return ReadString();
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}
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static void FindTableOffsets()
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{
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s_symtabOffset = 0;
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s_strtabOffset = 0;
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Seek(s_sectionHeaderOffset + s_sectionHeaderEntrySize * s_shstrtabIndex + 0x10);
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std::uint32_t shstrtabOffset = ReadInt32();
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for (int i = 0; i < s_sectionCount; i++)
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{
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std::string name = GetSectionName(shstrtabOffset, i);
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if (name == ".symtab")
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{
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if (s_symtabOffset)
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FATAL_ERROR("error: mutiple .symtab sections found in \"%s\"\n", s_elfPath.c_str());
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Seek(s_sectionHeaderOffset + s_sectionHeaderEntrySize * i + 0x10);
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s_symtabOffset = ReadInt32();
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std::uint32_t size = ReadInt32();
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s_symbolCount = size / 16;
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}
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else if (name == ".strtab")
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{
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if (s_strtabOffset)
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FATAL_ERROR("error: mutiple .strtab sections found in \"%s\"\n", s_elfPath.c_str());
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Seek(s_sectionHeaderOffset + s_sectionHeaderEntrySize * i + 0x10);
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s_strtabOffset = ReadInt32();
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}
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}
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if (!s_symtabOffset)
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FATAL_ERROR("error: couldn't find .symtab section in \"%s\"\n", s_elfPath.c_str());
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if (!s_strtabOffset)
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FATAL_ERROR("error: couldn't find .strtab section in \"%s\"\n", s_elfPath.c_str());
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}
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static std::map<std::string, std::uint32_t> GetCommonSymbols_Shared()
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{
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VerifyElfIdent();
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ReadElfHeader();
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FindTableOffsets();
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std::map<std::string, std::uint32_t> commonSymbols;
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std::vector<Symbol> commonSymbolVec;
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Seek(s_symtabOffset);
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for (std::uint32_t i = 0; i < s_symbolCount; i++)
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{
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Symbol sym;
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sym.nameOffset = ReadInt32();
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Skip(4);
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sym.size = ReadInt32();
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Skip(2);
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std::uint16_t sectionIndex = ReadInt16();
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if (sectionIndex == SHN_COMMON)
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commonSymbolVec.push_back(sym);
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}
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for (const Symbol& sym : commonSymbolVec)
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{
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Seek(s_strtabOffset + sym.nameOffset);
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std::string name = ReadString();
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commonSymbols[name] = sym.size;
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}
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return commonSymbols;
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}
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std::map<std::string, std::uint32_t> GetCommonSymbolsFromLib(std::string sourcePath, std::string libpath)
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{
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std::size_t colonPos = libpath.find(':');
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if (colonPos == std::string::npos)
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FATAL_ERROR("error: missing colon separator in libfile \"%s\"\n", s_elfPath.c_str());
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s_archiveObjectPath = libpath.substr(colonPos + 1);
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s_archiveFilePath = sourcePath + "/" + libpath.substr(1, colonPos - 1);
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s_elfPath = sourcePath + "/" + libpath.substr(1);
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s_file = std::fopen(s_archiveFilePath.c_str(), "rb");
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if (s_file == NULL)
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FATAL_ERROR("error: failed to open \"%s\" for reading\n", s_archiveFilePath.c_str());
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VerifyAr();
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FindArObj();
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return GetCommonSymbols_Shared();
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}
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std::map<std::string, std::uint32_t> GetCommonSymbols(std::string sourcePath, std::string path)
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{
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s_elfFileOffset = 0;
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if (path[0] == '*')
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return GetCommonSymbolsFromLib(sourcePath, path);
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s_elfPath = sourcePath + "/" + path;
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s_file = std::fopen(s_elfPath.c_str(), "rb");
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if (s_file == NULL)
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FATAL_ERROR("error: failed to open \"%s\" for reading\n", path.c_str());
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return GetCommonSymbols_Shared();
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}
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