msgpack-javascript/msgpack.codec.js at master · fireice1981/msgpack-javascript · GitHub

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/*!{id:msgpack.codec.js,ver:1.05,license:"MIT",author:"uupaa.js@gmail.com"}*/

// === msgpack ===

// MessagePack -> http://msgpack.sourceforge.net/

this.msgpack || (function(globalScope) {

globalScope.msgpack = {

pack: msgpackpack, // msgpack.pack(data:Mix,

// toString:Boolean = false):ByteArray/ByteString/false

// [1][mix to String] msgpack.pack({}, true) -> "..."

// [2][mix to ByteArray] msgpack.pack({}) -> [...]

unpack: msgpackunpack // msgpack.unpack(data:BinaryString/ByteArray):Mix

// [1][String to mix] msgpack.unpack("...") -> {}

// [2][ByteArray to mix] msgpack.unpack([...]) -> {}

};

var _bin2num = {}, // BinaryStringToNumber { "\00": 0, ... "\ff": 255 }

_num2bin = {}, // NumberToBinaryString { 0: "\00", ... 255: "\ff" }

_buf = [], // decode buffer

_idx = 0, // decode buffer[index]

_error = 0, // msgpack.pack() error code. 1 = CYCLIC_REFERENCE_ERROR

_isArray = Array.isArray || (function(mix) {

return Object.prototype.toString.call(mix) === "[object Array]";

}),

_toString = String.fromCharCode, // CharCode/ByteArray to String

_MAX_DEPTH = 512;

// msgpack.pack

function msgpackpack(data, // @param Mix:

toString) { // @param Boolean(= false):

// @return ByteArray/BinaryString/false:

// false is error return

// [1][mix to String] msgpack.pack({}, true) -> "..."

// [2][mix to ByteArray] msgpack.pack({}) -> [...]

_error = 0;

var byteArray = encode([], data, 0);

return _error ? false

: toString ? byteArrayToByteString(byteArray)

: byteArray;

}

// msgpack.unpack

function msgpackunpack(data) { // @param BinaryString/ByteArray:

// @return Mix/undefined:

// undefined is error return

// [1][String to mix] msgpack.unpack("...") -> {}

// [2][ByteArray to mix] msgpack.unpack([...]) -> {}

_buf = typeof data === "string" ? toByteArray(data) : data;

_idx = -1;

return decode(); // mix or undefined

}

// inner - encoder

function encode(rv, // @param ByteArray: result

mix, // @param Mix: source data

depth) { // @param Number: depth

var size, i, iz, c, pos, // for UTF8.encode, Array.encode, Hash.encode

high, low, sign, exp, frac; // for IEEE754

if (mix == null) { // null or undefined -> 0xc0 ( null )

rv.push(0xc0);

} else if (mix === false) { // false -> 0xc2 ( false )

rv.push(0xc2);

} else if (mix === true) { // true -> 0xc3 ( true )

rv.push(0xc3);

} else {

switch (typeof mix) {

case "number":

if (mix !== mix) { // isNaN

rv.push(0xcb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff); // quiet NaN

} else if (mix === Infinity) {

rv.push(0xcb, 0x7f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00); // positive infinity

} else if (Math.floor(mix) === mix) { // int or uint

if (mix < 0) {

// int

if (mix >= -32) { // negative fixnum

rv.push(0xe0 + mix + 32);

} else if (mix > -0x80) {

rv.push(0xd0, mix + 0x100);

} else if (mix > -0x8000) {

mix += 0x10000;

rv.push(0xd1, mix >> 8, mix & 0xff);

} else if (mix > -0x80000000) {

mix += 0x100000000;

rv.push(0xd2, mix >>> 24, (mix >> 16) & 0xff,

(mix >> 8) & 0xff, mix & 0xff);

} else {

high = Math.floor(mix / 0x100000000);

low = mix & 0xffffffff;

rv.push(0xd3, (high >> 24) & 0xff, (high >> 16) & 0xff,

(high >> 8) & 0xff, high & 0xff,

(low >> 24) & 0xff, (low >> 16) & 0xff,

(low >> 8) & 0xff, low & 0xff);

}

} else {

// uint

if (mix < 0x80) {

rv.push(mix); // positive fixnum

} else if (mix < 0x100) { // uint 8

rv.push(0xcc, mix);

} else if (mix < 0x10000) { // uint 16

rv.push(0xcd, mix >> 8, mix & 0xff);

} else if (mix < 0x100000000) { // uint 32

rv.push(0xce, mix >>> 24, (mix >> 16) & 0xff,

(mix >> 8) & 0xff, mix & 0xff);

} else {

high = Math.floor(mix / 0x100000000);

low = mix & 0xffffffff;

rv.push(0xcf, (high >> 24) & 0xff, (high >> 16) & 0xff,

(high >> 8) & 0xff, high & 0xff,

(low >> 24) & 0xff, (low >> 16) & 0xff,

(low >> 8) & 0xff, low & 0xff);

}

} else { // double

// THX!! @edvakf

// http://javascript.g.hatena.ne.jp/edvakf/20101128/1291000731

sign = mix < 0;

sign && (mix *= -1);

// add offset 1023 to ensure positive

// 0.6931471805599453 = Math.LN2;

exp = ((Math.log(mix) / 0.6931471805599453) + 1023) | 0;

// shift 52 - (exp - 1023) bits to make integer part exactly 53 bits,

// then throw away trash less than decimal point

frac = mix * Math.pow(2, 52 + 1023 - exp);

// S+-Exp(11)--++-----------------Fraction(52bits)-----------------------+

// || || |

// v+----------++--------------------------------------------------------+

// 00000000|00000000|00000000|00000000|00000000|00000000|00000000|00000000

// 6 5 55 4 4 3 2 1 8 0

// 3 6 21 8 0 2 4 6

// +----------high(32bits)-----------+ +----------low(32bits)------------+

// | | | |

// +---------------------------------+ +---------------------------------+

// 3 2 21 1 8 0

// 1 4 09 6

low = frac & 0xffffffff;

sign && (exp |= 0x800);

high = ((frac / 0x100000000) & 0xfffff) | (exp << 20);

rv.push(0xcb, (high >> 24) & 0xff, (high >> 16) & 0xff,

(high >> 8) & 0xff, high & 0xff,

(low >> 24) & 0xff, (low >> 16) & 0xff,

(low >> 8) & 0xff, low & 0xff);

}

break;

case "string":

// http://d.hatena.ne.jp/uupaa/20101128

iz = mix.length;

pos = rv.length; // keep rewrite position

rv.push(0); // placeholder

// utf8.encode

for (i = 0; i < iz; ++i) {

c = mix.charCodeAt(i);

if (c < 0x80) { // ASCII(0x00 ~ 0x7f)

rv.push(c & 0x7f);

} else if (c < 0x0800) {

rv.push(((c >>> 6) & 0x1f) | 0xc0, (c & 0x3f) | 0x80);

} else if (c < 0x10000) {

rv.push(((c >>> 12) & 0x0f) | 0xe0,

((c >>> 6) & 0x3f) | 0x80, (c & 0x3f) | 0x80);

}

size = rv.length - pos - 1;

if (size < 32) {

rv[pos] = 0xa0 + size; // rewrite

} else if (size < 0x10000) { // 16

rv.splice(pos, 1, 0xda, size >> 8, size & 0xff);

} else if (size < 0x100000000) { // 32

rv.splice(pos, 1, 0xdb,

size >>> 24, (size >> 16) & 0xff,

(size >> 8) & 0xff, size & 0xff);

}

break;

default: // array or hash

if (++depth >= _MAX_DEPTH) {

_error = 1; // CYCLIC_REFERENCE_ERROR

return rv = []; // clear

}

if (_isArray(mix)) {

size = mix.length;

if (size < 16) {

rv.push(0x90 + size);

} else if (size < 0x10000) { // 16

rv.push(0xdc, size >> 8, size & 0xff);

} else if (size < 0x100000000) { // 32

rv.push(0xdd, size >>> 24, (size >> 16) & 0xff,

(size >> 8) & 0xff, size & 0xff);

}

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

encode(rv, mix[i], depth);

}

} else { // hash

// http://d.hatena.ne.jp/uupaa/20101129

pos = rv.length; // keep rewrite position

rv.push(0); // placeholder

size = 0;

for (i in mix) {

++size;

encode(rv, i, depth);

encode(rv, mix[i], depth);

}

if (size < 16) {

rv[pos] = 0x80 + size; // rewrite

} else if (size < 0x10000) { // 16

rv.splice(pos, 1, 0xde, size >> 8, size & 0xff);

} else if (size < 0x100000000) { // 32

rv.splice(pos, 1, 0xdf,

size >>> 24, (size >> 16) & 0xff,

(size >> 8) & 0xff, size & 0xff);

}

return rv;

}

// inner - decoder

function decode() { // @return Mix:

var size, i, iz, c, num = 0,

sign, exp, frac, ary, hash,

buf = _buf, type = buf[++_idx];

if (type >= 0xe0) { // Negative FixNum (111x xxxx) (-32 ~ -1)

return type - 0x100;

}

if (type < 0xc0) {

if (type < 0x80) { // Positive FixNum (0xxx xxxx) (0 ~ 127)

return type;

}

if (type < 0x90) { // FixMap (1000 xxxx)

num = type - 0x80;

type = 0x80;

} else if (type < 0xa0) { // FixArray (1001 xxxx)

num = type - 0x90;

type = 0x90;

} else { // if (type < 0xc0) { // FixRaw (101x xxxx)

num = type - 0xa0;

type = 0xa0;

}

switch (type) {

case 0xc0: return null;

case 0xc2: return false;

case 0xc3: return true;

case 0xca: // float

num = buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

sign = num & 0x80000000; // 1bit

exp = (num >> 23) & 0xff; // 8bits

frac = num & 0x7fffff; // 23bits

if (!num || num === 0x80000000) { // 0.0 or -0.0

return 0;

}

if (exp === 0xff) { // NaN or Infinity

return frac ? NaN : Infinity;

}

return (sign ? -1 : 1) *

(frac | 0x800000) * Math.pow(2, exp - 127 - 23); // 127: bias

case 0xcb: // double

num = buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

sign = num & 0x80000000; // 1bit

exp = (num >> 20) & 0x7ff; // 11bits

frac = num & 0xfffff; // 52bits - 32bits (high word)

if (!num || num === 0x80000000) { // 0.0 or -0.0

_idx += 4;

return 0;

}

if (exp === 0x7ff) { // NaN or Infinity

_idx += 4;

return frac ? NaN : Infinity;

}

num = buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

return (sign ? -1 : 1) *

((frac | 0x100000) * Math.pow(2, exp - 1023 - 20) // 1023: bias

+ num * Math.pow(2, exp - 1023 - 52));

// 0xcf: uint64, 0xce: uint32, 0xcd: uint16

case 0xcf: num = buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

return num * 0x100000000 +

buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

case 0xce: num += buf[++_idx] * 0x1000000 + (buf[++_idx] << 16);

case 0xcd: num += buf[++_idx] << 8;

case 0xcc: return num + buf[++_idx];

// 0xd3: int64, 0xd2: int32, 0xd1: int16, 0xd0: int8

case 0xd3: num = buf[++_idx];

if (num & 0x80) { // sign -> avoid overflow

return ((num ^ 0xff) * 0x100000000000000 +

(buf[++_idx] ^ 0xff) * 0x1000000000000 +

(buf[++_idx] ^ 0xff) * 0x10000000000 +

(buf[++_idx] ^ 0xff) * 0x100000000 +

(buf[++_idx] ^ 0xff) * 0x1000000 +

(buf[++_idx] ^ 0xff) * 0x10000 +

(buf[++_idx] ^ 0xff) * 0x100 +

(buf[++_idx] ^ 0xff) + 1) * -1;

}

return num * 0x100000000000000 +

buf[++_idx] * 0x1000000000000 +

buf[++_idx] * 0x10000000000 +

buf[++_idx] * 0x100000000 +

buf[++_idx] * 0x1000000 +

buf[++_idx] * 0x10000 +

buf[++_idx] * 0x100 +

buf[++_idx];

case 0xd2: num = buf[++_idx] * 0x1000000 + (buf[++_idx] << 16) +

(buf[++_idx] << 8) + buf[++_idx];

return num < 0x80000000 ? num : num - 0x100000000; // 0x80000000 * 2

case 0xd1: num = (buf[++_idx] << 8) + buf[++_idx];

return num < 0x8000 ? num : num - 0x10000; // 0x8000 * 2

case 0xd0: num = buf[++_idx];

return num < 0x80 ? num : num - 0x100; // 0x80 * 2

// 0xdb: raw32, 0xda: raw16, 0xa0: raw ( string )

case 0xdb: num += buf[++_idx] * 0x1000000 + (buf[++_idx] << 16);

case 0xda: num += (buf[++_idx] << 8) + buf[++_idx];

case 0xa0: // utf8.decode

for (ary = [], i = _idx, iz = i + num; i < iz; ) {

c = buf[++i]; // lead byte

ary.push(c < 0x80 ? c : // ASCII(0x00 ~ 0x7f)

c < 0xe0 ? ((c & 0x1f) << 6 | (buf[++i] & 0x3f)) :

((c & 0x0f) << 12 | (buf[++i] & 0x3f) << 6

| (buf[++i] & 0x3f)));

}

_idx = i;

return ary.length < 10240 ? _toString.apply(null, ary)

: byteArrayToByteString(ary);

// 0xdf: map32, 0xde: map16, 0x80: map

case 0xdf: num += buf[++_idx] * 0x1000000 + (buf[++_idx] << 16);

case 0xde: num += (buf[++_idx] << 8) + buf[++_idx];

case 0x80: hash = {};

while (num--) {

// make key/value pair

size = buf[++_idx] - 0xa0;

for (ary = [], i = _idx, iz = i + size; i < iz; ) {

c = buf[++i]; // lead byte

ary.push(c < 0x80 ? c : // ASCII(0x00 ~ 0x7f)

c < 0xe0 ? ((c & 0x1f) << 6 | (buf[++i] & 0x3f)) :

((c & 0x0f) << 12 | (buf[++i] & 0x3f) << 6

| (buf[++i] & 0x3f)));

}

_idx = i;

hash[_toString.apply(null, ary)] = decode();

}

return hash;

// 0xdd: array32, 0xdc: array16, 0x90: array

case 0xdd: num += buf[++_idx] * 0x1000000 + (buf[++_idx] << 16);

case 0xdc: num += (buf[++_idx] << 8) + buf[++_idx];

case 0x90: ary = [];

while (num--) {

ary.push(decode());

}

return ary;

}

return;

}

// inner - byteArray To ByteString

function byteArrayToByteString(byteArray) { // @param ByteArray

// @return String

// http://d.hatena.ne.jp/uupaa/20101128

try {

return _toString.apply(this, byteArray); // toString

} catch(err) {

; // avoid "Maximum call stack size exceeded"

}

var rv = [], i = 0, iz = byteArray.length, num2bin = _num2bin;

for (; i < iz; ++i) {

rv[i] = num2bin[byteArray[i]];

}

return rv.join("");

}

// inner - BinaryString To ByteArray

function toByteArray(data) { // @param BinaryString: "\00\01"

// @return ByteArray: [0x00, 0x01]

var rv = [], bin2num = _bin2num, remain,

ary = data.split(""),

i = -1, iz;

iz = ary.length;

remain = iz % 8;

while (remain--) {

++i;

rv[i] = bin2num[ary[i]];

}

remain = iz >> 3;

while (remain--) {

rv.push(bin2num[ary[++i]], bin2num[ary[++i]],

bin2num[ary[++i]], bin2num[ary[++i]],

bin2num[ary[++i]], bin2num[ary[++i]]);

}

return rv;

}

// --- init ---

(function() {

var i = 0, v;

for (; i < 0x100; ++i) {

v = _toString(i);

_bin2num[v] = i; // "\00" -> 0x00

_num2bin[i] = v; // 0 -> "\00"

}

// http://twitter.com/edvakf/statuses/15576483807

for (i = 0x80; i < 0x100; ++i) { // [Webkit][Gecko]

_bin2num[_toString(0xf700 + i)] = i; // "\f780" -> 0x80

}

})();

})(this);

msgpack-javascript/msgpack.codec.js at master · fireice1981/msgpack-javascript · GitHub

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