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ByteBuffer.html
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ByteBuffer.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>ByteBuffer for browser</title>
</head>
<body>
<script type="text/javascript">
/*
* 构造方法
* @param org_buf 需要解包的二进制
* @param offset 指定数据在二进制的初始位置 默认是0
*/
var ByteBuffer = function (arrayBuf, offset) {
var Type_Byte = 1;
var Type_Short = 2;
var Type_UShort = 3;
var Type_Int32 = 4;
var Type_UInt32 = 5;
var Type_String = 6;//变长字符串，前两个字节表示长度
var Type_VString = 7;//定长字符串
var Type_Int64 = 8;
var Type_Float = 9;
var Type_Double = 10;
var Type_ByteArray = 11;
var _org_buf = arrayBuf ? (arrayBuf.constructor == DataView ? arrayBuf : (arrayBuf.constructor == Uint8Array ? new DataView(arrayBuf.buffer, offset) : new DataView(arrayBuf, offset))) : new DataView(new Uint8Array([]).buffer);
var _offset = offset || 0;
var _list = [];
var _littleEndian = false;
//指定字节序 为BigEndian
this.bigEndian = function(){
_littleEndian = false;
return this;
};
//指定字节序 为LittleEndian
this.littleEndian = function(){
_littleEndian = true;
return this;
};
if (!ArrayBuffer.prototype.slice) {
ArrayBuffer.prototype.slice = function (start, end) {
var that = new Uint8Array(this);
if (end == undefined) end = that.length;
var result = new ArrayBuffer(end - start);
var resultArray = new Uint8Array(result);
for (var i = 0; i < resultArray.length; i++)
resultArray[i] = that[i + start];
return result;
}
}
function utf8Write(view, offset, str) {
var c = 0;
for (var i = 0, l = str.length; i < l; i++) {
c = str.charCodeAt(i);
if (c < 0x80) {
view.setUint8(offset++, c);
}
else if (c < 0x800) {
view.setUint8(offset++, 0xc0 | (c >> 6));
view.setUint8(offset++, 0x80 | (c & 0x3f));
}
else if (c < 0xd800 || c >= 0xe000) {
view.setUint8(offset++, 0xe0 | (c >> 12));
view.setUint8(offset++, 0x80 | (c >> 6) & 0x3f);
view.setUint8(offset++, 0x80 | (c & 0x3f));
}
else {
i++;
c = 0x10000 + (((c & 0x3ff) << 10) | (str.charCodeAt(i) & 0x3ff));
view.setUint8(offset++, 0xf0 | (c >> 18));
view.setUint8(offset++, 0x80 | (c >> 12) & 0x3f);
view.setUint8(offset++, 0x80 | (c >> 6) & 0x3f);
view.setUint8(offset++, 0x80 | (c & 0x3f));
}
}
}
function utf8Read(view, offset, length) {
var string = '', chr = 0;
for (var i = offset, end = offset + length; i < end; i++) {
var byte = view.getUint8(i);
if ((byte & 0x80) === 0x00) {
string += String.fromCharCode(byte);
continue;
}
if ((byte & 0xe0) === 0xc0) {
string += String.fromCharCode(
((byte & 0x0f) << 6) |
(view.getUint8(++i) & 0x3f)
);
continue;
}
if ((byte & 0xf0) === 0xe0) {
string += String.fromCharCode(
((byte & 0x0f) << 12) |
((view.getUint8(++i) & 0x3f) << 6) |
((view.getUint8(++i) & 0x3f) << 0)
);
continue;
}
if ((byte & 0xf8) === 0xf0) {
chr = ((byte & 0x07) << 18) |
((view.getUint8(++i) & 0x3f) << 12) |
((view.getUint8(++i) & 0x3f) << 6) |
((view.getUint8(++i) & 0x3f) << 0);
if (chr >= 0x010000) { // surrogate pair
chr -= 0x010000;
string += String.fromCharCode((chr >>> 10) + 0xD800, (chr & 0x3FF) + 0xDC00);
} else {
string += String.fromCharCode(chr);
}
continue;
}
throw new Error('Invalid byte ' + byte.toString(16));
}
return string;
}
function utf8Length(str) {
var c = 0, length = 0;
for (var i = 0, l = str.length; i < l; i++) {
c = str.charCodeAt(i);
if (c < 0x80) {
length += 1;
}
else if (c < 0x800) {
length += 2;
}
else if (c < 0xd800 || c >= 0xe000) {
length += 3;
}
else {
i++;
length += 4;
}
}
return length;
}
this.byte = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getUint8(_offset,_littleEndian));
_offset += 1;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Byte, d: val, l: 1 });
_offset += 1;
}
return this;
};
this.short = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getInt16(_offset,_littleEndian));
_offset += 2;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Short, d: val, l: 2 });
_offset += 2;
}
return this;
};
this.ushort = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getUint16(_offset,_littleEndian));
_offset += 2;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_UShort, d: val, l: 2 });
_offset += 2;
}
return this;
};
this.int32 = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getInt32(_offset,_littleEndian));
_offset += 4;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Int32, d: val, l: 4 });
_offset += 4;
}
return this;
};
this.uint32 = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getUint32(_offset,_littleEndian));
_offset += 4;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_UInt32, d: val, l: 4 });
_offset += 4;
}
return this;
};
/**
* 变长字符串 前4个字节表示字符串长度
**/
this.string = function (val, index) {
if (arguments.length == 0) {
var len = _org_buf.getInt32(_offset,_littleEndian);
_offset += 4;
_list.push(utf8Read(_org_buf,_offset,len));
_offset += len;
} else {
var len = 0;
if (val) {
len = utf8Length(val);
}
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_String, d: val, l: len });
_offset += len + 4;
}
return this;
};
/**
* 定长字符串 val为null时，读取定长字符串（需指定长度len）
**/
this.vstring = function (val, len, index) {
if (!len) {
throw new Error('vstring must got len argument');
return this;
}
if (val == undefined || val == null) {
var vlen = 0;//实际长度
for (var i = _offset; i < _offset + len; i++) {
if (_org_buf.getUint8(i) > 0) vlen++;
}
_list.push(utf8Read(_org_buf,_offset,vlen));
_offset += len;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_VString, d: val, l: len });
_offset += len;
}
return this;
};
this.int64 = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getFloat64(_offset,_littleEndian));
_offset += 8;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Int64, d: val, l: 8 });
_offset += 8;
}
return this;
};
this.float = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getFloat32(_offset,_littleEndian));
_offset += 4;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Float, d: val, l: 4 });
_offset += 4;
}
return this;
};
this.double = function (val, index) {
if (arguments.length == 0) {
_list.push(_org_buf.getFloat64(_offset,_littleEndian));
_offset += 8;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_Double, d: val, l: 8 });
_offset += 8;
}
return this;
};
/**
* 写入或读取一段字节数组
**/
this.byteArray = function (val, len, index) {
if (!len) {
throw new Error('byteArray must got len argument');
return this;
}
if (val == undefined || val == null) {
var arr = new Uint8Array(_org_buf.buffer.slice(_offset, _offset + len));
_list.push(arr);
_offset += len;
} else {
_list.splice(index != undefined ? index : _list.length, 0, { t: Type_ByteArray, d: val, l: len });
_offset += len;
}
return this;
};
/**
* 解包成数据数组
**/
this.unpack = function () {
return _list;
};
/**
* 打包成二进制,在前面加上4个字节表示包长
**/
this.packWithHead = function () {
return this.pack(true);
};
/**
* 打包成二进制
* @param ifHead 是否在前面加上4个字节表示包长
**/
this.pack = function (ifHead) {
_org_buf = new DataView(new ArrayBuffer((ifHead) ? _offset + 4 : _offset));
var offset = 0;
if (ifHead) {
_org_buf.setUint32(offset, _offset,_littleEndian);
offset += 4;
}
for (var i = 0; i < _list.length; i++) {
switch (_list[i].t) {
case Type_Byte:
_org_buf.setInt8(offset, _list[i].d);
offset += _list[i].l;
break;
case Type_Short:
_org_buf.setInt16(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_UShort:
_org_buf.setUint16(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_Int32:
_org_buf.setInt32(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_UInt32:
_org_buf.setUint32(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_String:
//前4个字节表示字符串长度
_org_buf.setUint32(offset, _list[i].l,_littleEndian);
offset += 4;
utf8Write(_org_buf,offset,_list[i].d);
offset += _list[i].l;
break;
case Type_VString:
utf8Write(_org_buf,offset,_list[i].d);
var vlen = utf8Length(_list[i].d);//字符串实际长度
//补齐\0
for (var j = offset + vlen; j < offset + _list[i].l; j++) {
_org_buf.setUint8(j, 0);
}
offset += _list[i].l;
break;
case Type_Int64:
_org_buf.setFloat64(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_Float:
_org_buf.setFloat32(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_Double:
_org_buf.setFloat64(offset, _list[i].d,_littleEndian);
offset += _list[i].l;
break;
case Type_ByteArray:
var indx = 0;
for (var j = offset; j < offset + _list[i].l; j++) {
if (indx < _list[i].d.length) {
_org_buf.setUint8(j, _list[i].d[indx]);
} else {//不够的话，后面补齐0x00
_org_buf.setUint8(j, 0);
}
indx++
}
offset += _list[i].l;
break;
}
}
return _org_buf.buffer;
};
/**
* 未读数据长度
**/
this.getAvailable = function () {
if (!_org_buf) return _offset;
return _org_buf.buffer.byteLength - _offset;
};
}
//压包操作
var sbuf = new ByteBuffer().littleEndian();
var buffer = sbuf.string('abc123你好')//变长字符串，utf8编码，前4个字节表示字符串长度
.int32(-999).uint32(999).float(-0.5)
.int64(9999999).double(-0.000005).short(32767).ushort(65535)
.byte(255)
.vstring('abcd', 10)//定长字符串，utf8编码,不足的字节补0x00
.byteArray(new Uint8Array([65, 66, 67, 68, 69]), 5)//字节数组，不足字节补0x00
.pack();//结尾调用打包方法
//buffer 类型是ArrayBuffer
console.log(buffer);
//解包操作
var rbuf = new ByteBuffer(buffer).littleEndian();
//解包出来是一个数组
var arr = rbuf.string()//变长字符串，utf8编码，前4个字节表示字符串长度
.int32().uint32().float()
.int64().double().short().ushort()
.byte()
.vstring(null, 10)//定长字符串，utf8编码,不足的字节补0x00
.byteArray(null, 5)//字节数组，不足字节补0x00
.unpack();//结尾调用解包方法
console.log(arr);
</script>
</body>
</html>