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/*jshint esversion: 6 */
"use strict";
const DataView = require('buffer-dataview');
const fs = require('fs');
const assert = require('assert');
const lua_State = require('./lstate.js').lua_State;
const LClosure = require('./lobject.js').LClosure;
const Proto = require('./lfunc.js').Proto;
/**
* Parse Lua 5.3 bytecode
* @see {@link http://www.lua.org/source/5.3/lundump.c.html|lundump.c}
*/
class BytecodeParser {
/**
* Initilialize bytecode parser
* @constructor
* @param {lua_State} Lua state object
* @param {DataView} dataView Contains the binary data
*/
constructor(L, dataView) {
this.intSize = 4;
this.size_tSize = 8;
this.instructionSize = 4;
this.integerSize = 8;
this.numberSize = 8;
this.L = L;
this.dataView = dataView;
this.offset = 0;
}
peekByte() {
return this.dataView.getUint8(this.offset, true);
}
readByte() {
let byte = this.peekByte();
this.offset++;
return byte;
}
peekInteger() {
return this.dataView.getInt32(this.offset, true);
}
readInteger() {
let integer = this.peekInteger();
this.offset += this.integerSize;
return integer;
}
peekNumber() {
return this.dataView.getFloat64(this.offset, true);
}
readNumber() {
let number = this.peekNumber();
this.offset += this.numberSize;
return number;
}
readString(n) {
let string = "";
for (let i = 0; i < n; i++)
string += String.fromCharCode(this.readByte());
return string;
}
checkHeader() {
if (this.readString(4) !== "\x1bLua")
throw new Error("bad LUA_SIGNATURE, expected '<esc>Lua'");
if (this.readByte() !== 0x53)
throw new Error("bad Lua version, expected 5.3");
if (this.readByte() !== 0)
throw new Error("supports only official PUC-Rio implementation");
if (this.readString(6) !== "\x19\x93\r\n\x1a\n")
throw new Error("bytecode corrupted");
this.intSize = this.readByte();
this.size_tSize = this.readByte();
this.instructionSize = this.readByte();
this.integerSize = this.readByte();
this.numberSize = this.readByte();
if (this.readInteger() !== 0x5678)
throw new Error("endianness mismatch");
if (this.readNumber() !== 370.5)
throw new Error("float format mismatch in");
}
luaU_undump() {
checkHeader();
let cl = new LClosure(this.L, this.readByte());
L.top++;
cl.p = new Proto(this.L);
loadFunction(cl.p);
assert(cl.nupvalues === cl.p.upvalues.length);
return cl;
}
}
module.exports = BytecodeParser;
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