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For Internet Explorer, read binary data in use of base64 encoding by …
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…XMLDOM COM object and decoding by javascript implementation
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@cuzic
cuzic committed May 23, 2010
1 parent dab911f commit 7f7bc5d
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Showing 2 changed files with 148 additions and 56 deletions.
11 changes: 6 additions & 5 deletions benchmark/benchmark.html
View file
Expand Up @@ -19,7 +19,8 @@
},
onSuccess: function(response) {
if(MessagePack.hasVBS){
$msgpack = response.transport.responseBody;
var binary = response.transport.responseBody;
$msgpack = binary;
}else{
$msgpack = response.responseText;
}
Expand All @@ -40,17 +41,17 @@
});
};

function getTimeMeasurementJavaScript(func){
function getTimeMeasurementJavaScript(name, func){
timeStart=new Date();

func();

totalTime = (new Date - timeStart);
window.alert(totalTime + " milli sec");
C(name + ":" + totalTime + " milli sec");
}

function msgpack_benchmark(msgpack){
getTimeMeasurementJavaScript(function(){
getTimeMeasurementJavaScript("msgpack", function(){
var data;
for(var i = 0; i < 10; i++){
data = MessagePack.unpack(msgpack);
Expand All @@ -59,7 +60,7 @@
}

function json_benchmark(json){
getTimeMeasurementJavaScript(function(){
getTimeMeasurementJavaScript("json", function(){
var data;
for(var i = 0; i < 10; i++){
data = eval(json);
Expand Down
193 changes: 142 additions & 51 deletions msgpack.js
View file
Expand Up @@ -9,8 +9,13 @@ MessagePack.CharSet = 0;
MessagePack.Decoder = function(data, charSet){
this.index = 0;
if(MessagePack.hasVBS){
this.length = msgpack_getLength(data);
this.data = msgpack_binary_to_array(data);
if(typeof(data) == "unknown"){
this.length = msgpack_getLength(data);
this.byte_array_to_string(data);
}else{
this.length = msgpack_getLength(data);
this.data = data;
}
}else{
this.length = data.length;
this.data = data;
Expand All @@ -33,28 +38,26 @@ MessagePack.Decoder = function(data, charSet){

if(typeof execScript != 'undefined'){
execScript(
'Function msgpack_getByte(data, pos)\n' +
' msgpack_getByte = AscB(MidB(data, pos + 1, 1))\n'+
'Dim g_msgpack_binary_data\n' +
'Sub msgpack_set_binary_data(binary)\n' +
' g_msgpack_binary_data = binary\n' +
'End Sub\n' +
'Function msgpack_getByte(pos)\n' +
' msgpack_getByte = AscB(MidB(g_msgpack_binary_data, pos + 1, 1))\n'+
'End Function\n',"VBScript");
execScript(
'Function msgpack_binary_to_array(binary)\n' +
' Dim i, length\n'+
' length = LenB(binary)\n'+
' ReDim byte_array(length)\n'+
' For i = 1 To length\n'+
' byte_array(i - 1) = AscB(MidB(binary, i, 1))\n'+
'Function msgpack_substr(pos, len)\n' +
' Dim array()\n'+
' ReDim array(len)\n'+
' For i = 1 To len\n'+
' array(i-1) = AscB(MidB(g_msgpack_binary_data, pos + i, 1))\n'+
' Next\n'+
' msgpack_binary_to_array = byte_array\n'+
'End Function\n', "VBScript");
execScript(
'Function msgpack_substr(data, pos, len)\n' +
' msgpack_substr = MidB(data, pos + 1, len)\n'+
' msgpack_substr = array\n'+
'End Function\n' +
'Function msgpack_getLength(data)\n' +
' msgpack_getLength = LenB(data)\n' +
'End Function\n' +
'\n', 'VBScript');

}

MessagePack.hasVBS = 'msgpack_getByte' in this;
Expand Down Expand Up @@ -211,26 +214,26 @@ with({p: MessagePack.Decoder.prototype}){
var bytes = this.read(size);
this.index += size;
if(this.charSet == 1){
return String.prototype.fromCharCode.apply(String, bytes);
return String.fromCharCode.apply(String, bytes);
}else if(this.charSet == -1){
return bytes;
}
else{
// assume UTF-8 string
var i = 0, str = "";
while(i < bytes.length){
var c = bytes[i];
var i = 0, str = "", c, code;
while(i < size){
c = bytes[i];
if( c < 128){
str += String.fromCharCode(c);
i++;
}
else if((c ^ 0xc0) < 32){
var code = (c ^ 0xc0) << 6 | (bytes[i + 1] & 63);
code = ((c ^ 0xc0) << 6) | (bytes[i+1] & 63);
str += String.fromCharCode(code);
i += 2;
}
else {
var code = ((c & 15) << 12) | ((bytes[i+1] & 63) << 6) |
code = ((c & 15) << 12) | ((bytes[i+1] & 63) << 6) |
(bytes[i+2] & 63);
str += String.fromCharCode(code);
i += 3;
Expand Down Expand Up @@ -278,50 +281,138 @@ with({p: MessagePack.Decoder.prototype}){
return (sign == 0 ? 1 : -1) * frac;
}

if(MessagePack.hasVBS){
p.read = function(length){
var j = this.index;
if(j + length <= this.length){
var byte_array = new Array(length);
for(var i = 0; i < length; ++i){
byte_array[i] = this.data[j + i];
// byte_array[i] = this.data.charCodeAt(this.data, j + i);
p.byte_array_to_string = function(data){
var binary_to_js_array_hex = function(binary){
var xmldom = new ActiveXObject("Microsoft.XMLDOM");
var bin = xmldom.createElement("bin");
bin.nodeTypedValue = data;
bin.dataType = "bin.hex";

var text = bin.text;
var size = text.length;
return function (start, length){
var i = 0, chunk = 4, bytes = []
chunk2 = chunk*2, hex, int32;
for(; i + 3 < length; i+=4){
hex = text.substr(2*(i + start), chunk2);
int32 = parseInt(hex, 16);

bytes[i ] = (int32 > 24) & 0xff;
bytes[i + 1] = (int32 > 16) & 0xff;
bytes[i + 2] = (int32 > 8) & 0xff;
bytes[i + 3] = int32 & 0xff;
}
return byte_array;
}else{
throw "MessagePackFailure: index is out of range";
for(i -= 3; i < length; i++){
hex = this.data.substr(2*(i+start), 2);
bytes[i] = parseInt(hex, 16);
}
return bytes;
}
}

p.getc = function(){
var j = this.index;
if(j < this.length){
return this.data[j];
//return this.data.charCodeAt(j);
}else{
throw "MessagePackFailure: index is out of range";
}
}
}else{
p.read = function(length){
var j = this.index;
if(j + length <= this.length){
var bytes = new Array(length);
for(var i = length - 1; i >= 0; --i){
bytes[i] = this.data.charCodeAt(j+i);
var binary_to_js_array_base64 = function(binary){
var chr2index = {};
var text;
(function(){
var xmldom = new ActiveXObject("Microsoft.XMLDOM");
var bin = xmldom.createElement("bin");
bin.dataType = "bin.base64";
bin.nodeTypedValue = binary;

text = bin.text.replace(/[^A-Za-z0-9\+\/\=]/g, "");

var b64map =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
for(var i = 0, length = b64map.length; i < length ; i++){
chr2index[b64map.charAt(i)] = i;
}
})();
var chr2, chr3, prev_i = 0;
return function(start, length){
var bytes, last_pos = Math.floor(3 * prev_i / 4);
switch(last_pos - start){
case 2:
bytes = [chr2, chr3];
break;
case 1:
bytes = [chr3];
break;
default:
bytes = [];
}
var j = bytes.length;
if(length <= j){
bytes.length = length;
return bytes;
}
var i = prev_i, enc1, enc2, enc3, enc4,
last = 4*Math.ceil((start + length) / 3);
while(i < last){
enc1 = chr2index[text.charAt(i++)];
enc2 = chr2index[text.charAt(i++)];
enc3 = chr2index[text.charAt(i++)];
enc4 = chr2index[text.charAt(i++)];

bytes[j++] = (enc1 << 2) | (enc2 >> 4);
bytes[j++] = ((enc2 & 0x0f) << 4) | (enc3 >> 2);
bytes[j++] = ((enc3 & 0x03) << 6) | enc4;
}
prev_i = i;
chr2 = bytes[j-2];
chr3 = bytes[j-1];
bytes.length = length;
return bytes;
}
}

var binary_to_js_array_vbs = function(data){
msgpack_set_binary_data(data);
return function(position, length){
return msgpack_substr(position, length).toArray();
}
};

//var bytes_substr = binary_to_js_array_hex(data);
var bytes_substr = binary_to_js_array_base64(data);
//var bytes_substr = binary_to_js_array_vbs(data);

this.read = function(length){
var j = this.index, i = 0;
if( j + length <= this.length){
return bytes_substr( j, length);
}else{
throw "MessagePackFailure: index is out of range";
}
}
p.getc = function(){

this.getc = function(){
var j = this.index;
if(j < this.length){
return this.data.charCodeAt(j);
return bytes_substr( j, 1)[0];
}else{
throw "MessagePackFailure: index is out of range";
}
}
}

p.read = function(length){
var j = this.index;
if(j + length <= this.length){
var bytes = new Array(length);
for(var i = length - 1; i >= 0; --i){
bytes[i] = this.data.charCodeAt(j+i);
}
return bytes;
}else{
throw "MessagePackFailure: index is out of range";
}
}
p.getc = function(){
var j = this.index;
if(j < this.length){
return this.data.charCodeAt(j);
}else{
throw "MessagePackFailure: index is out of range";
}
}
}

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