lua-bytecode-parser-ce/src/lua_bytecode_parser.cc at master · std-microblock/lua-bytecode-parser-ce · GitHub

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#include "lua_bytecode_parser.h"

#include <algorithm>

#include <format>

#include <print>

#include <stdexcept>

#define LUA_SIGNATURE_53 "\x1BLua"

#define LUAC_VERSION_53_MAJOR 0x5

#define LUAC_VERSION_53_MINOR 0x3

#define LUAC_FORMAT_53 0

#define LUAC_DATA_53 "\x19\x93\r\n\x1a\n"

#define LUAC_INT_53 0x5678

#define LUAC_NUM_53 (lua_Number)370.5

template <typename T> T bytes_to_value(const char *bytes) {

T value;

std::copy(bytes, bytes + sizeof(T), reinterpret_cast<char *>(&value));

return value;

}

LuaBytecodeParser::LuaBytecodeParser(const std::vector<char> &bytecode_data)

: data_(bytecode_data), offset_(0), encrypt_key_(0),

is_ce_bytecode_(false) {}

void LuaBytecodeParser::error(const std::string &msg) {

throw std::runtime_error("Bytecode parsing error: " + msg);

}

void LuaBytecodeParser::read_block(char *buffer, size_t size) {

if (offset_ + size > data_.size()) {

error("truncated (block)");

}

std::copy(data_.begin() + offset_, data_.begin() + offset_ + size, buffer);

if (is_ce_bytecode_ && encrypt_key_ != 0) {

for (size_t i = 0; i < size; ++i) {

char decrypt_byte;

if ((((i + (i >> 3) & 7) & 7) - ((i >> 3) & 7)) != 0) {

decrypt_byte = (char)(encrypt_key_ >> (i % 0xe));

} else {

decrypt_byte = (char)0xce;

}

buffer[i] ^= decrypt_byte;

}

offset_ += size;

}

std::string LuaBytecodeParser::read_string() {

size_t size = read_byte();

if (size == 0xFF) {

size = read_uint64();

}

if (size == 0) {

return "";

} else {

std::string s(size - 1, '\0');

read_block(&s[0], size - 1);

return s;

}

static std::string hexdump(const std::string &s) {

std::string result;

for (unsigned char c : s) {

result += std::format("{:02x} ", c);

}

return result;

}

void LuaBytecodeParser::check_literal(const std::string &expected,

const std::string &error_msg) {

std::string buffer(expected.length(), '\0');

read_block(&buffer[0], expected.length());

if (buffer != expected) {

error(error_msg + std::format("expected '{}', got '{}'", hexdump(expected),

hexdump(buffer)));

}

void LuaBytecodeParser::check_size(size_t expected_size,

const std::string &type_name) {

std::uint8_t actual_size = read_byte();

if (actual_size != expected_size) {

error(type_name + " size mismatch");

}

void LuaBytecodeParser::check_header() {

check_literal(LUA_SIGNATURE_53 + 1,

"not a Lua 5.3 bytecode file (magic mismatch)");

std::uint8_t version_byte = read_byte();

std::uint8_t major_version = (version_byte >> 4) & 0x0F;

std::uint8_t minor_version = version_byte & 0x0F;

if (major_version != LUAC_VERSION_53_MAJOR ||

minor_version != LUAC_VERSION_53_MINOR) {

error("version mismatch");

}

std::uint8_t format = read_byte();

if (format != LUAC_FORMAT_53) {

if (format == 1) {

encrypt_key_ = read_uint64();

} else {

error("format mismatch");

}

check_literal(LUAC_DATA_53, "corrupted data section");

check_size(sizeof(int), "int");

if (is_ce_bytecode_) {

check_size(8, "LUA_DUMP_STRINGSIZE_FORMAT2");

} else {

check_size(sizeof(size_t), "size_t");

}

check_size(sizeof(Instruction), "Instruction");

check_size(sizeof(lua_Integer), "lua_Integer");

check_size(sizeof(lua_Number), "lua_Number");

if (read_uint64() != LUAC_INT_53) {

error("endianness mismatch");

}

if (read_double() != LUAC_NUM_53) {

error("float format mismatch");

}

if (format == 1)

is_ce_bytecode_ = true;

}

void LuaBytecodeParser::load_code(LuaProto &f) {

int n = read_uint32();

f.code.resize(n);

read_block(reinterpret_cast<char *>(f.code.data()), n * sizeof(Instruction));

if (is_ce_bytecode_ && encrypt_key_ != 0) {

for (int i = 0; i < n; ++i) {

f.code[i] -= (i & 3);

}

void LuaBytecodeParser::load_constants(LuaProto &f) {

std::uint32_t n = read_uint32();

f.constants.resize(n);

for (std::uint32_t i = 0; i < n; ++i) {

LuaType t = static_cast<LuaType>(read_byte());

f.constants[i].type = t;

switch (t) {

case LUA_TNIL:

break;

case LUA_TBOOLEAN:

f.constants[i].bval = (read_byte() != 0);

break;

case LUA_TNUMFLT:

f.constants[i].nval = read_double();

break;

case LUA_TNUMINT:

f.constants[i].ival = read_uint64();

break;

case LUA_TSHRSTR:

case LUA_TLNGSTR:

new (&f.constants[i].sval) std::string(read_string());

break;

default:

error("unknown constant type: " + std::to_string(static_cast<int>(t)));

}

void LuaBytecodeParser::load_upvalues(LuaProto &f) {

int n = read_uint32();

f.upvalues.resize(n);

for (int i = 0; i < n; ++i) {

f.upvalues[i].instack = read_byte();

f.upvalues[i].idx = read_byte();

}

void LuaBytecodeParser::load_protos(LuaProto &f) {

int n = read_uint32();

f.protos.resize(n);

for (int i = 0; i < n; ++i) {

f.protos[i] = std::make_shared<LuaProto>();

load_function(*f.protos[i], f.source);

}

void LuaBytecodeParser::load_debug(LuaProto &f) {

std::uint32_t n_lineinfo = read_uint32();

f.lineinfo.resize(n_lineinfo);

read_block(reinterpret_cast<char *>(f.lineinfo.data()),

n_lineinfo * sizeof(std::uint32_t));

std::uint32_t n_locvars = read_uint32();

f.locvars.resize(n_locvars);

for (std::uint32_t i = 0; i < n_locvars; ++i) {

f.locvars[i].varname = read_string();

f.locvars[i].startpc = read_uint32();

f.locvars[i].endpc = read_uint32();

}

std::uint32_t n_upvalue_names = read_uint32();

f.upvalue_names.resize(n_upvalue_names);

for (std::uint32_t i = 0; i < n_upvalue_names; ++i) {

f.upvalue_names[i] = read_string();

}

void LuaBytecodeParser::load_function(LuaProto &f, const std::string &psource) {

f.source = read_string();

if (f.source.empty()) {

f.source = psource;

}

f.linedefined = read_uint32();

f.lastlinedefined = read_uint32();

f.numparams = read_byte();

f.is_vararg = read_byte();

f.maxstacksize = read_byte();

load_code(f);

load_constants(f);

load_upvalues(f);

load_protos(f);

load_debug(f);

}

std::shared_ptr<LuaProto> LuaBytecodeParser::parse() {

if (read_byte() != LUA_SIGNATURE_53[0]) {

error("not a Lua 5.3 bytecode file (signature byte mismatch)");

}

check_header();

std::uint8_t nupvalues_main = read_byte();

std::shared_ptr<LuaProto> main_proto = std::make_shared<LuaProto>();

load_function(*main_proto, "");

if (nupvalues_main != main_proto->upvalues.size()) {

error("main closure upvalue count mismatch with main prototype");

}

return main_proto;

}

LuaBytecodeFormatter::LuaBytecodeFormatter(std::ostream &os)

: os_(os), indent_level_(0) {}

void LuaBytecodeFormatter::indent() {

for (int i = 0; i < indent_level_; ++i) {

os_ << " ";

}

void LuaBytecodeFormatter::format_instruction(const Instruction &instr,

int pc) {

indent();

os_ << std::setw(4) << std::setfill('0') << pc << " ";

os_ << "0x" << std::hex << std::setw(8) << std::setfill('0') << instr

<< std::dec << std::endl;

}

void LuaBytecodeFormatter::format_constant(const LuaConstant &constant,

int index) {

indent();

os_ << " [" << index << "] ";

switch (constant.type) {

case LUA_TNIL:

os_ << "NIL" << std::endl;

break;

case LUA_TBOOLEAN:

os_ << "BOOLEAN " << (constant.bval ? "true" : "false") << std::endl;

break;

case LUA_TNUMFLT:

os_ << "NUMBER (float) " << constant.nval << std::endl;

break;

case LUA_TNUMINT:

os_ << "NUMBER (integer) " << constant.ival << std::endl;

break;

case LUA_TSHRSTR:

case LUA_TLNGSTR:

os_ << "STRING \"" << constant.sval << "\"" << std::endl;

break;

default:

os_ << "UNKNOWN_TYPE (" << static_cast<int>(constant.type) << ")"

<< std::endl;

break;

}

void LuaBytecodeFormatter::format_upvaldesc(const LuaUpvaldesc &upval,

int index) {

indent();

os_ << " Upvalue [" << index << "]: ";

os_ << "Instack=" << (int)upval.instack << ", Idx=" << (int)upval.idx;

if (index < upval.name.length() && !upval.name.empty()) {

os_ << ", Name=\"" << upval.name << "\"";

}

os_ << std::endl;

}

void LuaBytecodeFormatter::format_locvar(const LuaLocVar &locvar, int index) {

indent();

os_ << " LocalVar [" << index << "]: ";

os_ << "Name=\"" << locvar.varname << "\", StartPC=" << locvar.startpc

<< ", EndPC=" << locvar.endpc << std::endl;

}

void LuaBytecodeFormatter::format_proto(const LuaProto &proto) {

indent();

os_ << "Function Prototype:" << std::endl;

indent_level_++;

indent();

os_ << "Source: \"" << proto.source << "\"" << std::endl;

indent();

os_ << "Line Defined: " << proto.linedefined << std::endl;

indent();

os_ << "Last Line Defined: " << proto.lastlinedefined << std::endl;

indent();

os_ << "Num Params: " << (int)proto.numparams << std::endl;

indent();

os_ << "Is Vararg: " << (int)proto.is_vararg << std::endl;

indent();

os_ << "Max Stack Size: " << (int)proto.maxstacksize << std::endl;

indent();

os_ << "Code (" << proto.code.size() << " instructions):" << std::endl;

indent_level_++;

for (size_t i = 0; i < proto.code.size(); ++i) {

format_instruction(proto.code[i], i);

}

indent_level_--;

indent();

os_ << "Constants (" << proto.constants.size() << "):" << std::endl;

indent_level_++;

for (size_t i = 0; i < proto.constants.size(); ++i) {

format_constant(proto.constants[i], i);

}

indent_level_--;

indent();

os_ << "Upvalues (" << proto.upvalues.size() << "):" << std::endl;

indent_level_++;

for (size_t i = 0; i < proto.upvalues.size(); ++i) {

std::string upval_name =

(i < proto.upvalue_names.size()) ? proto.upvalue_names[i] : "";

LuaUpvaldesc temp_upval = proto.upvalues[i];

temp_upval.name = upval_name;

format_upvaldesc(temp_upval, i);

}

indent_level_--;

indent();

os_ << "Local Variables (" << proto.locvars.size() << "):" << std::endl;

indent_level_++;

for (size_t i = 0; i < proto.locvars.size(); ++i) {

format_locvar(proto.locvars[i], i);

}

indent_level_--;

indent();

os_ << "Nested Prototypes (" << proto.protos.size() << "):" << std::endl;

indent_level_++;

for (size_t i = 0; i < proto.protos.size(); ++i) {

format_proto(*proto.protos[i]);

}

indent_level_--;

indent();

os_ << "End Function Prototype" << std::endl;

}

void LuaBytecodeFormatter::format(const LuaProto &proto) {

format_proto(proto);

}

LuaBytecodeWriter::LuaBytecodeWriter(std::ostream &os) : os_(os) {}

void LuaBytecodeWriter::write_byte(std::uint8_t val) {

os_.write(reinterpret_cast<const char *>(&val), sizeof(val));

}

void LuaBytecodeWriter::write_int(std::uint32_t val) {

os_.write(reinterpret_cast<const char *>(&val), sizeof(val));

}

void LuaBytecodeWriter::write_number(lua_Number val) {

os_.write(reinterpret_cast<const char *>(&val), sizeof(val));

}

void LuaBytecodeWriter::write_integer(lua_Integer val) {

os_.write(reinterpret_cast<const char *>(&val), sizeof(val));

}

void LuaBytecodeWriter::write_block(const char *buffer, size_t size) {

os_.write(buffer, size);

}

void LuaBytecodeWriter::write_string(const std::string &s) {

size_t size = s.length() + 1;

if (size < 0xFF) {

write_byte(static_cast<std::uint8_t>(size));

} else {

write_byte(0xFF);

write_integer(size);

}

write_block(s.c_str(), s.length());

}

void LuaBytecodeWriter::write_header() {

write_byte(LUA_SIGNATURE_53[0]);

write_block(LUA_SIGNATURE_53 + 1, strlen(LUA_SIGNATURE_53 + 1));

write_byte(LUAC_VERSION_53);

write_byte(LUAC_FORMAT_53);

write_block(LUAC_DATA_53, strlen(LUAC_DATA_53));

write_byte(sizeof(int));

write_byte(sizeof(size_t));

write_byte(sizeof(Instruction));

write_byte(sizeof(lua_Integer));

write_byte(sizeof(lua_Number));

write_integer(LUAC_INT_53);

write_number(LUAC_NUM_53);

}

void LuaBytecodeWriter::write_code(const LuaProto &f) {

write_int(f.code.size());

write_block(reinterpret_cast<const char *>(f.code.data()),

f.code.size() * sizeof(Instruction));

}

void LuaBytecodeWriter::write_constants(const LuaProto &f) {

write_int(f.constants.size());

for (const auto &constant : f.constants) {

write_byte(static_cast<std::uint8_t>(constant.type));

switch (constant.type) {

case LUA_TNIL:

break;

case LUA_TBOOLEAN:

write_byte(constant.bval ? 1 : 0);

break;

case LUA_TNUMFLT:

write_number(constant.nval);

break;

case LUA_TNUMINT:

write_integer(constant.ival);

break;

case LUA_TSHRSTR:

case LUA_TLNGSTR:

write_string(constant.sval);

break;

default:

throw std::runtime_error("unknown constant type during write: " +

std::to_string(static_cast<int>(constant.type)));

}

void LuaBytecodeWriter::write_upvalues(const LuaProto &f) {

write_int(f.upvalues.size());

for (const auto &upval : f.upvalues) {

write_byte(upval.instack);

write_byte(upval.idx);

}

void LuaBytecodeWriter::write_protos(const LuaProto &f) {

write_int(f.protos.size());

for (const auto &proto : f.protos) {

write_function(*proto, f.source);

}

void LuaBytecodeWriter::write_debug(const LuaProto &f) {

write_int(f.lineinfo.size());

write_block(reinterpret_cast<const char *>(f.lineinfo.data()),

f.lineinfo.size() * sizeof(std::uint32_t));

write_int(f.locvars.size());

for (const auto &locvar : f.locvars) {

write_string(locvar.varname);

write_int(locvar.startpc);

write_int(locvar.endpc);

}

write_int(f.upvalue_names.size());

for (const auto &name : f.upvalue_names) {

write_string(name);

}

void LuaBytecodeWriter::write_function(const LuaProto &f,

const std::string &psource) {

if (f.source == psource || f.source.empty()) {

write_string("");

} else {

write_string(f.source);

}

write_int(f.linedefined);

write_int(f.lastlinedefined);

write_byte(f.numparams);

write_byte(f.is_vararg);

write_byte(f.maxstacksize);

write_code(f);

write_constants(f);

write_upvalues(f);

write_protos(f);

write_debug(f);

}

void LuaBytecodeWriter::write(const LuaProto &proto) {

write_header();

write_byte(proto.upvalues.size());

write_function(proto, "");

}

lua-bytecode-parser-ce/src/lua_bytecode_parser.cc at master · std-microblock/lua-bytecode-parser-ce · GitHub

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