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authorBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-02 07:36:14 +0100
committerBenoit Giannangeli <benoit.giannangeli@boursorama.fr>2017-02-02 07:36:14 +0100
commitfa7ce109418aca2fd60fdb65b4b2451c4854dd09 (patch)
treec6469ea5d437374a7db0980422a18c32d9a6fb61 /src
parentebeb32400b9a2d3e7196887f7021b9bf08770fd9 (diff)
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Following Lua's source code as closely as possible
Diffstat (limited to 'src')
-rw-r--r--src/bytecodeparser.js28
-rw-r--r--src/lobject.js15
-rw-r--r--src/lstate.js36
-rw-r--r--src/lundump.js67
4 files changed, 118 insertions, 28 deletions
diff --git a/src/bytecodeparser.js b/src/bytecodeparser.js
deleted file mode 100644
index 595158e..0000000
--- a/src/bytecodeparser.js
+++ /dev/null
@@ -1,28 +0,0 @@
-"use strict";
-
-const DataView = require('buffer-dataview');
-
-/**
- * Parse Lua 5.3 bytecode
- */
-class BytecodeParser {
-
- constructor(dataView) {
- this.dataView = dataView;
- this.offset = 0;
- }
-
- _read(offset, nbytes) {
- let bytes = new Uint8Array(nbytes);
-
- for (let i = 0; i < nbytes; i++)
- bytes[i] = this.dataView.getUint8(offset, true);
-
- return bytes.length === 1 ? bytes[0] : bytes;
- }
-
- readByte() {
- return read(this.offset++, 1);
- }
-
-} \ No newline at end of file
diff --git a/src/lobject.js b/src/lobject.js
new file mode 100644
index 0000000..2e21f16
--- /dev/null
+++ b/src/lobject.js
@@ -0,0 +1,15 @@
+/*jshint esversion: 6 */
+"use strict";
+
+class LClosure {
+
+ constructor(L, n) {
+ this.p = [];
+ this.nupvalues = n;
+ }
+
+}
+
+module.exports = {
+ LClosure: LClosure
+}; \ No newline at end of file
diff --git a/src/lstate.js b/src/lstate.js
new file mode 100644
index 0000000..b0002c3
--- /dev/null
+++ b/src/lstate.js
@@ -0,0 +1,36 @@
+/*jshint esversion: 6 */
+"use strict";
+
+class lua_State {
+
+ constructor() {
+ // CommonHeader;
+ // unsigned short nci; /* number of items in 'ci' list */
+ // lu_byte status;
+ // StkId top; /* first free slot in the stack */
+ // global_State *l_G;
+ // CallInfo *ci; /* call info for current function */
+ // const Instruction *oldpc; /* last pc traced */
+ // StkId stack_last; /* last free slot in the stack */
+ // StkId stack; /* stack base */
+ // UpVal *openupval; /* list of open upvalues in this stack */
+ // GCObject *gclist;
+ // struct lua_State *twups; list of threads with open upvalues
+ // struct lua_longjmp *errorJmp; /* current error recover point */
+ // CallInfo base_ci; /* CallInfo for first level (C calling Lua) */
+ // volatile lua_Hook hook;
+ // ptrdiff_t errfunc; /* current error handling function (stack index) */
+ // int stacksize;
+ // int basehookcount;
+ // int hookcount;
+ // unsigned short nny; /* number of non-yieldable calls in stack */
+ // unsigned short nCcalls; /* number of nested C calls */
+ // l_signalT hookmask;
+ // lu_byte allowhook;
+ }
+
+}
+
+module.exports = {
+ lua_State: lua_State
+}; \ No newline at end of file
diff --git a/src/lundump.js b/src/lundump.js
new file mode 100644
index 0000000..69445d4
--- /dev/null
+++ b/src/lundump.js
@@ -0,0 +1,67 @@
+/*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;
+ }
+
+} \ No newline at end of file