71 lines
2.2 KiB
JavaScript
71 lines
2.2 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const { pow, floor } = Math;
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const TWO_POW_32 = pow(2, 32);
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/**
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* Mimic Java's ByteBufffer with big endian order
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*/
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class ByteBuffer {
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constructor(data) {
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this.position = 0;
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this.data = data;
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this.int32ArrayForConvert = new Uint32Array(1);
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this.int8ArrayForConvert = new Uint8Array(this.int32ArrayForConvert.buffer);
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}
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static allocate(size = 16) {
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return new ByteBuffer(new Uint8Array(size));
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}
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put(value) {
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if (this.position === this.data.length) {
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const oldArray = this.data;
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this.data = new Uint8Array(this.data.length * 2);
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this.data.set(oldArray);
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}
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this.data[this.position] = value;
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this.position++;
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}
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putInt32(value) {
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if (this.data.length - this.position < 4) {
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const oldArray = this.data;
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this.data = new Uint8Array(this.data.length * 2 + 4);
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this.data.set(oldArray);
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}
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this.int32ArrayForConvert[0] = value;
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this.data.set(this.int8ArrayForConvert.reverse(), this.position);
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this.position += 4;
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}
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putInt64(value) {
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this.putInt32(floor(value / TWO_POW_32));
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this.putInt32(value);
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}
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putArray(array) {
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if (this.data.length - this.position < array.byteLength) {
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const oldArray = this.data;
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this.data = new Uint8Array(this.position + array.byteLength);
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this.data.set(oldArray);
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}
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this.data.set(array, this.position);
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this.position += array.byteLength;
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}
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get() {
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const value = this.data[this.position];
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this.position++;
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return value;
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}
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getInt32() {
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this.int8ArrayForConvert.set(this.data.slice(this.position, this.position + 4).reverse());
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const value = this.int32ArrayForConvert[0];
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this.position += 4;
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return value;
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}
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getInt64() {
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const high = this.getInt32();
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const low = this.getInt32();
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return high * TWO_POW_32 + low;
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}
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resetPosition() {
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this.position = 0;
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}
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}
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exports.default = ByteBuffer;
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//# sourceMappingURL=ByteBuffer.js.map
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