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ByteArray.js
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ByteArray.js
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// 假设 i 是一个包含相关转换方法的库
const i = {
// 示例实现,具体实现需要根据实际情况来
convertToByte: (value) => value & 0xFF,
shortToByteArray: (value) => new Uint8Array([(value & 0xFF00) >> 8, value & 0xFF]),
intToByteArray: (value) => new Uint8Array([(value & 0xFF000000) >>> 24, (value & 0xFF0000) >>> 16, (value & 0xFF00) >>> 8, value & 0xFF]),
longToByteArray: (value) => {
// JavaScript中通常使用Number来表示64位整数,这里只是一个示例
let high = Math.floor(value / 0x100000000);
let low = value & 0xFFFFFFFF;
return new Uint8Array([
(high & 0xFF000000) >>> 24, (high & 0xFF0000) >>> 16, (high & 0xFF00) >>> 8, high & 0xFF,
(low & 0xFF000000) >>> 24, (low & 0xFF0000) >>> 16, (low & 0xFF00) >>> 8, low & 0xFF
]);
},
floatToByteArray: (value) => {
let buffer = new ArrayBuffer(4);
(new Float32Array(buffer))[0] = value;
return new Uint8Array(buffer);
},
doubleToByteArray: (value) => {
let buffer = new ArrayBuffer(8);
(new Float64Array(buffer))[0] = value;
return new Uint8Array(buffer);
},
utf16ToUtf8Array: (value) => {
// 这里需要一个实际的UTF-16到UTF-8的转换实现
// 以下代码只是一个占位符
return new TextEncoder().encode(value);
}
};
function ByteArray(t) {
this.buffer = null;
this.index = 0;
this.length = 0;
this.buffer = new Uint8Array(t);
this.length = t;
}
var proto = ByteArray.prototype;
proto.writeBytes = function(t) {
this.checkSize(t.length);
this.buffer.set(t, this.index);
this.index += t.length;
};
proto.writeByte = function(t) {
this.checkSize(1);
this.buffer[this.index] = i.convertToByte(t);
this.index += 1;
};
proto.writeShort = function(t) {
var e = i.shortToByteArray(t);
this.writeBytes(e);
};
proto.writeInt = function(t) {
var e = i.intToByteArray(t);
this.writeBytes(e);
};
proto.writeLong = function(t) {
var e = i.longToByteArray(t);
this.writeBytes(e);
};
proto.writeFloat = function(t) {
var e = i.floatToByteArray(t);
this.writeBytes(e);
};
proto.writeDouble = function(t) {
var e = i.doubleToByteArray(t);
this.writeBytes(e);
};
proto.writeUtf = function(t) {
var e = i.utf16ToUtf8Array(t);
this.writeShort(e.length);
this.writeBytes(e);
};
proto.checkSize = function(t) {
if (this.index + t > this.length) {
this.expandBuffer();
}
};
proto.expandBuffer = function() {
var t = new Uint8Array(2 * this.length);
t.set(this.buffer, 0);
this.length *= 2;
this.buffer = t;
};
proto.readByte = function() {
if (this.checkSize(1)) {
var e = this.buffer[this.index];
return this.index += 1,
e
}
return 0
}
,
proto.readShort = function() {
return this.readInteger(2)
}
,
proto.readInt = function() {
return this.readInteger(4)
}
,
proto.readLong = function() {
return this.readInteger(8)
}
,
proto.readInteger = function(e) {
if (this.checkSize(e)) {
var r = t.byteArrayToInteger(this.buffer, this.index, e);
return this.index += e,
r
}
return 0
}
,
proto.readFloat = function() {
if (this.checkSize(4)) {
var e = t.byteArrayToFloat(this.buffer, this.index);
return this.index += 4,
e
}
return 0
}
,
proto.readDouble = function() {
if (this.checkSize(8)) {
var e = t.byteArrayToDouble(this.buffer, this.index);
return this.index += 8,
e
}
return 0
}
,
proto.readBytes = function(e) {
if (this.checkSize(e)) {
var r = this.buffer.subarray(this.index, e);
return this.index += e,
r
}
return new Uint8Array(0)
}
,
proto.readUtf = function() {
var e = this.readShort();
if (e > 0) {
var r = t.byteArrayToString(this.buffer, this.index, e);
return this.index += e,
r
}
return ""
}
proto.getBytes = function() {
return this.buffer.subarray(0, this.index);
};
// 导出ByteArray,以便在其他文件中使用
module.exports = ByteArray;