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/*jshint esversion: 6 */
"use strict";
const DataView = require('buffer-dataview');
const fs = require('fs');
const lua_State = require('./lstate.js').lua_State;
const LClosure = require('./lobject.js').LClosure;
/**
* 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 {DataView} dataView Contains the binary data
*/
constructor(dataView) {
this.dataView = dataView;
this.offset = 0;
}
peekByte() {
return this.dataView.getUint8(this.offset, true);
}
readByte() {
let byte = this.peekByte();
this.offset++;
return byte;
}
peekWord() {
return this.dataView.getUint32(this.offset, true);
}
readWord() {
let word = this.peekWord();
this.offset += 4;
return word;
}
checkHeader() {
if (this.readByte() !== 0x1b
|| this.readByte() !== 0x4c
|| this.readByte() !== 0x75
|| this.readByte() !== 0x61)
throw new Error("Bad LUA_SIGNATURE, expected [1b 4c 75 61]");
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")
}
luaU_undump() {
checkHeader();
let cl = new LClosure(L, this.readByte());
return cl;
}
}
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