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// SPDX-License-Identifier: Zlib
// SPDX-FileCopyrightText: 2016 Sylvain Fargier
// SPDX-Created: 2016-11-08T14:04:02+01:00
// SPDX-FileContributor: Author: Sylvain Fargier <fargie_s> <fargier.sylvain@gmail.com>
"use strict";
class VarBuffer {
/**
* @param {?(Buffer|number)=} buf
*/
constructor(buf) {
this.length = 0;
if (Number.isInteger(buf)) {
/* @ts-ignore: checked above */
this._buffer = Buffer.allocUnsafe(buf);
}
else if (buf instanceof Buffer) {
this._buffer = buf;
this.length = buf.length;
}
else {
this._buffer = Buffer.allocUnsafe(VarBuffer.BUF_SZ);
}
}
reset() {
this.length = 0;
}
/**
* @param {Buffer} data
*/
add(data) {
while (data.length > this._buffer.length - this.length) {
this._enlarge();
}
data.copy(this._buffer, this.length, 0);
this.length += data.length;
}
/** @return {Buffer} */
buffer() {
return this._buffer.slice(0, this.length);
}
/**
* @param {number} start
* @param {number} [end]
* @return {Buffer}
*/
slice(start, end) {
return this._buffer.slice(start, end ?? this.length);
}
/** @return {number} */
reserved() {
return this._buffer.length;
}
/** @param {number} size */
resize(size) {
while (size > this._buffer.length) {
this._enlarge();
}
this.length = size;
}
/**
* @brief remove the first elements of the buffer
* @param {number} [n=1]
*/
shift(n = 1) {
if (this.length === 0 || !Number.isInteger(n) || n < 1) { return; }
if (n > this.length) { n = this.length; }
const remainder = this.slice(n);
this.reset();
if (remainder.length > 0) { this.add(remainder); }
}
/**
* @brief copy part of a buffer at a specific offset
* @param {Buffer|VarBuffer} target destination buffer
* @param {number} targetStart target start offset
* @param {number} sourceStart source (this) start offset
* @param {number} [sourceEnd] source end offset
* @return {number} number of bytes copied
*/
copy(target, targetStart, sourceStart, sourceEnd) {
if (target instanceof VarBuffer) {
target = target._buffer;
}
return this._buffer.copy(target, targetStart, sourceStart,
(sourceEnd ?? this.length));
}
_enlarge() {
var old = this._buffer;
this._buffer = Buffer.allocUnsafe(this._buffer.length * 2);
old.copy(this._buffer, 0, 0, this.length);
}
}
VarBuffer.BUF_SZ = 2048;
export default VarBuffer;
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