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169 lines (117 loc) · 2.44 KB
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/**
* ByteTools.js: Browser
* Copyright (c) 2020 PROPHESSOR
*
* This software is released under the MIT License.
* https://opensource.org/licenses/MIT
*/
export default class ByteTools {
/**
*
* @param {DataView} view - DataView (new DataView(ArrayBuffer))
*/
constructor(view) {
this.buffer = view;
this.offset = 0;
}
// basics
get length() {
return this.buffer.byteLength;
}
tell() {
return this.offset;
}
/**
*
* @param {number} offset
* @param {'START'|'CUR'} mode
*/
seek(offset, mode = 'START') {
switch (mode) {
case 'CUR':
return this.offset += offset;
case 'START':
default:
return this.offset = offset;
}
}
// read
readString(length = Infinity, trimZeroEnding = true) {
let string = '';
for (let i = 0; i < length; i++) {
const char = this.readUInt8();
if (length === Infinity && char === 0) return string;
string += String.fromCharCode(char);
}
if (trimZeroEnding) return string.replace(/\x00/g, '');
return string;
}
// int8
readInt8() {
const tmp = this.buffer.getInt8(this.offset);
this.offset += 1;
return tmp;
}
readUInt8() {
const tmp = this.buffer.getUint8(this.offset);
this.offset += 1;
return tmp;
}
// int16
readInt16() {
const tmp = this.buffer.getInt16(this.offset, true);
this.offset += 2;
return tmp;
}
readUInt16() {
const tmp = this.buffer.getUint16(this.offset, true);
this.offset += 2;
return tmp;
}
// int32
readInt32() {
const tmp = this.buffer.getInt32(this.offset, true);
this.offset += 4;
return tmp;
}
readUInt32() {
const tmp = this.buffer.getUint32(this.offset, true);
this.offset += 4;
return tmp;
}
// seek
// int8
seekInt8() {
return this.buffer.getInt8(this.offset);
}
seekUInt8() {
return this.buffer.getUint8(this.offset);
}
// int16
seekInt16() {
return this.buffer.getInt16(this.offset, true);
}
seekUInt16() {
return this.buffer.getUint16(this.offset, true);
}
// int32
seekInt32() {
return this.buffer.getInt32(this.offset, true);
}
seekUInt32() {
return this.buffer.getUint32(this.offset, true);
}
// skip
// int8
skipInt8() {
return this.offset += 1;
}
// int16
skipInt16() {
return this.offset += 2;
}
// int32
skipInt32() {
return this.offset += 4;
}
}