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334 lines (311 loc) · 10 KB
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var BufferCursor = require('buffercursor');
var BufferBuilder = require('./bufferbuilder');
BinaryPack = {
unpack: function(data){
var unpacker = new BinaryPack.Unpacker(data);
return unpacker.unpack();
},
pack: function(data){
var packer = new BinaryPack.Packer();
var buffer = packer.pack(data);
return buffer;
}
};
BinaryPack.Unpacker = function(buffer){
this.cursor = new BufferCursor(buffer);
this.length = buffer.length;
}
BinaryPack.Unpacker.prototype.unpack = function(){
var type = this.cursor.readUInt8();
if (type < 0x80){
var positive_fixnum = type;
return positive_fixnum;
} else if ((type ^ 0xe0) < 0x20){
var negative_fixnum = (type ^ 0xe0) - 0x20;
return negative_fixnum;
}
var size;
if ((size = type ^ 0xa0) <= 0x0f){
return this.readraw(size);
} else if ((size = type ^ 0xb0) <= 0x0f){
return this.readstring(size);
} else if ((size = type ^ 0x90) <= 0x0f){
return this.readarray(size);
} else if ((size = type ^ 0x80) <= 0x0f){
return this.readmap(size);
}
switch(type){
case 0xc0:
return null;
case 0xc1:
return undefined;
case 0xc2:
return false;
case 0xc3:
return true;
case 0xca:
return this.cursor.readFloatBE();
case 0xcb:
return this.cursor.readDoubleBE();
case 0xcc:
return this.cursor.readUInt8();
case 0xcd:
return this.cursor.readUInt16BE();
case 0xce:
return this.cursor.readUInt32BE();
case 0xcf:
return this.readUInt64();
case 0xd0:
return this.cursor.readInt8();
case 0xd1:
return this.cursor.readInt16BE();
case 0xd2:
return this.cursor.readInt32BE();
case 0xd3:
return this.readInt64();
case 0xd4:
return undefined;
case 0xd5:
return undefined;
case 0xd6:
return undefined;
case 0xd7:
return undefined;
case 0xd8:
size = this.cursor.readUInt16BE();
return this.readstring(size);
case 0xd9:
size = this.cursor.readUInt32BE();
return this.readstring(size);
case 0xda:
size = this.cursor.readUInt16BE();
return this.readraw(size);
case 0xdb:
size = this.cursor.readUInt32BE();
return this.readraw(size);
case 0xdc:
size = this.cursor.readUInt16BE();
return this.readarray(size);
case 0xdd:
size = this.cursor.readUInt32BE();
return this.readarray(size);
case 0xde:
size = this.cursor.readUInt16BE();
return this.readmap(size);
case 0xdf:
size = this.cursor.readUInt32BE();
return this.readmap(size);
}
}
BinaryPack.Unpacker.prototype.readUInt64 = function(){
var bytes = this.cursor.slice(8);
return ((((((bytes[0] * 256 +
bytes[1]) * 256 +
bytes[2]) * 256 +
bytes[3]) * 256 +
bytes[4]) * 256 +
bytes[5]) * 256 +
bytes[6]) * 256 +
bytes[7];
}
BinaryPack.Unpacker.prototype.readInt64 = function(){
var uint64 = this.readInt64();
return (uint64 < Math.pow(2, 63) ) ? uint64 : uint64 - Math.pow(2, 64);
}
BinaryPack.Unpacker.prototype.readraw = function(size){
return this.cursor.slice(size).buffer;
}
BinaryPack.Unpacker.prototype.readstring = function(size){
return this.cursor.toString('utf8', size);
}
BinaryPack.Unpacker.prototype.readarray = function(size){
var objects = new Array(size);
for(var i = 0; i < size ; i++){
objects[i] = this.unpack();
}
return objects;
}
BinaryPack.Unpacker.prototype.readmap = function(size){
var map = {};
for(var i = 0; i < size ; i++){
var key = this.unpack();
var value = this.unpack();
map[key] = value;
}
return map;
}
BinaryPack.Packer = function(){
this.bufferBuilder = new BufferBuilder();
}
BinaryPack.Packer.prototype.pack = function(value){
var type = typeof(value);
if (type == 'string'){
this.pack_string(value);
} else if (type == 'number'){
if (Math.floor(value) === value){
this.pack_integer(value);
} else{
this.pack_double(value);
}
} else if (type == 'boolean'){
if (value === true){
this.bufferBuilder.append(0xc3, 2);
} else if (value === false){
this.bufferBuilder.append(0xc2, 2);
}
} else if (type == 'undefined'){
this.bufferBuilder.append(0xc0, 2);
} else if (type == 'object'){
if (value === null){
this.bufferBuilder.append(0xc0, 2);
} else {
var constructor = value.constructor;
if (constructor == Array){
this.pack_array(value);
} else if (Buffer.isBuffer(value)) {
this.pack_bin(value);
} else if (constructor == Object){
this.pack_object(value);
} else if (constructor == Date){
this.pack_string(value.toString());
} else if (typeof value.toBinaryPack == 'function'){
this.bufferBuilder.append(value.toBinaryPack(), 1);
} else {
throw new Error('Type "' + constructor.toString() + '" not yet supported');
}
}
} else {
throw new Error('Type "' + type + '" not yet supported');
}
return this.bufferBuilder.getBuffer();
}
BinaryPack.Packer.prototype.pack_bin = function(blob){
var length = blob.length || blob.byteLength || blob.size;
if (length <= 0x0f){
this.bufferBuilder.append(0xa0 + length, 2);
} else if (length <= 0xffff){
this.bufferBuilder.append(0xda, 2) ;
this.bufferBuilder.append(length, 3);
} else if (length <= 0xffffffff){
this.bufferBuilder.append(0xdb, 2);
this.bufferBuilder.append(length, 4);
} else{
throw new Error('Invalid length');
return;
}
this.bufferBuilder.append(blob, 1);
}
BinaryPack.Packer.prototype.pack_string = function(str){
var length = Buffer.byteLength(str);
if (length <= 0x0f){
this.bufferBuilder.append(0xb0 + length, 2);
} else if (length <= 0xffff){
this.bufferBuilder.append(0xd8, 2) ;
this.bufferBuilder.append(length, 3);
} else if (length <= 0xffffffff){
this.bufferBuilder.append(0xd9, 2);
this.bufferBuilder.append(length, 4);
} else{
throw new Error('Invalid length');
return;
}
this.bufferBuilder.append(str, 0);
}
BinaryPack.Packer.prototype.pack_array = function(ary){
var length = ary.length;
if (length <= 0x0f){
this.bufferBuilder.append(0x90 + length, 2);
} else if (length <= 0xffff){
this.bufferBuilder.append(0xdc, 2)
this.bufferBuilder.append(length, 3);
} else if (length <= 0xffffffff){
this.bufferBuilder.append(0xdd, 2);
this.bufferBuilder.append(length, 4);
} else{
throw new Error('Invalid length');
}
for(var i = 0; i < length ; i++){
this.pack(ary[i]);
}
}
BinaryPack.Packer.prototype.pack_integer = function(num){
if ( -0x20 <= num && num <= 0x7f){
this.bufferBuilder.append(num & 0xff, 2);
} else if (0x00 <= num && num <= 0xff){
this.bufferBuilder.append(0xcc, 2);
this.bufferBuilder.append(num, 2);
} else if (-0x80 <= num && num <= 0x7f){
this.bufferBuilder.append(0xd0, 2);
this.bufferBuilder.append(num, 5);
} else if ( 0x0000 <= num && num <= 0xffff){
this.bufferBuilder.append(0xcd, 2);
this.bufferBuilder.append(num, 3);
} else if (-0x8000 <= num && num <= 0x7fff){
this.bufferBuilder.append(0xd1, 2);
this.bufferBuilder.append(num, 6);
} else if ( 0x00000000 <= num && num <= 0xffffffff){
this.bufferBuilder.append(0xce, 2);
this.bufferBuilder.append(num, 4);
} else if (-0x80000000 <= num && num <= 0x7fffffff){
this.bufferBuilder.append(0xd2, 2);
this.bufferBuilder.append(num, 7);
} else if (-0x8000000000000000 <= num && num <= 0x7FFFFFFFFFFFFFFF){
this.bufferBuilder.append(0xd3, 2);
this.pack_int64(num);
} else if (0x0000000000000000 <= num && num <= 0xFFFFFFFFFFFFFFFF){
this.bufferBuilder.append(0xcf);
this.pack_uint64(num);
} else{
throw new Error('Invalid integer');
}
}
BinaryPack.Packer.prototype.pack_double = function(num){
this.bufferBuilder.append(0xcb, 2);
this.bufferBuilder.append(num, 9);
}
BinaryPack.Packer.prototype.pack_object = function(obj){
var keys = Object.keys(obj);
var length = keys.length;
if (length <= 0x0f){
this.bufferBuilder.append(0x80 + length, 2);
} else if (length <= 0xffff){
this.bufferBuilder.append(0xde, 2);
this.bufferBuilder.append(length, 3);
} else if (length <= 0xffffffff){
this.bufferBuilder.append(0xdf, 2);
this.bufferBuilder.append(length, 4);
} else{
throw new Error('Invalid length');
}
for(var prop in obj){
if (obj.hasOwnProperty(prop)){
this.pack(prop);
this.pack(obj[prop]);
}
}
}
BinaryPack.Packer.prototype.pack_int64 = function(num){
var high = Math.floor(num / Math.pow(2, 32));
var low = num % Math.pow(2, 32);
this.bufferBuilder.append((high & 0xff000000) >>> 24, 2);
this.bufferBuilder.append((high & 0x00ff0000) >>> 16, 2);
this.bufferBuilder.append((high & 0x0000ff00) >>> 8, 2);
this.bufferBuilder.append((high & 0x000000ff), 2);
this.bufferBuilder.append((low & 0xff000000) >>> 24, 2);
this.bufferBuilder.append((low & 0x00ff0000) >>> 16, 2);
this.bufferBuilder.append((low & 0x0000ff00) >>> 8, 2);
this.bufferBuilder.append((low & 0x000000ff), 2);
}
BinaryPack.Packer.prototype.pack_uint64 = function(num){
var high = num / Math.pow(2, 32);
var low = num % Math.pow(2, 32);
this.bufferBuilder.append((high & 0xff000000) >>> 24, 2);
this.bufferBuilder.append((high & 0x00ff0000) >>> 16, 2);
this.bufferBuilder.append((high & 0x0000ff00) >>> 8, 2);
this.bufferBuilder.append((high & 0x000000ff), 2);
this.bufferBuilder.append((low & 0xff000000) >>> 24, 2);
this.bufferBuilder.append((low & 0x00ff0000) >>> 16, 2);
this.bufferBuilder.append((low & 0x0000ff00) >>> 8, 2);
this.bufferBuilder.append((low & 0x000000ff), 2);
}
module.exports = BinaryPack;
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