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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";
/** @type {TextEncoder} */
let encoder;
/** @type {TextDecoder} */
let decoder;
/**
* @brief Variable size buffer
* @details Variable size buffer for Node and Browser
*/
export class VarBuffer {
static BUF_SZ = 2048;
#length = 0;
/** @type {Uint8Array} */
#buffer;
/**
* @param {?(Uint8Array|number)=} buf
*/
constructor(buf) {
if (Number.isInteger(buf)) {
/* @ts-ignore: checked above */
this.#buffer = new Uint8Array(buf);
}
else if (buf instanceof Uint8Array) {
this.#buffer = buf;
this.#length = buf.length;
}
else {
this.#buffer = new Uint8Array(VarBuffer.BUF_SZ);
}
}
reset() {
this.#length = 0;
}
/**
* @param {Uint8Array|string} data
*/
add(data) {
if (typeof data === "string") {
data = VarBuffer.encode(data).buffer;
}
while (data.length > this.#buffer.length - this.#length) {
this.#enlarge();
}
this.#buffer.set(data, this.#length);
this.#length += data.length;
return this;
}
/** @return {Uint8Array} */
get buffer() {
return this.#buffer.subarray(0, this.#length);
}
get length() {
return this.#length;
}
/**
* @param {number} start
* @param {number} [end]
* @return {Uint8Array}
*/
subarray(start, end) {
return this.#buffer.subarray(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;
return this;
}
/**
* @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 this; }
if (n > this.#length) { n = this.#length; }
const remainder = this.subarray(n);
this.reset();
if (remainder.length > 0) { this.add(remainder); }
return this;
}
/**
* @brief copy part of a buffer at a specific offset
* @details on the contrary to `add` this method will drop data not fitting
* in current buffer.
* @param {Uint8Array|VarBuffer} target destination buffer
* @param {number} [targetStart=0] target start offset
* @param {number} [sourceStart=0] source (this) start offset
* @param {number} [sourceEnd] source end offset
* @return {number} number of bytes copied
*/
copy(target, targetStart = 0, sourceStart = 0, sourceEnd = undefined) {
if (target instanceof VarBuffer) {
target = target.#buffer;
}
if (targetStart >= target.length) {
return 0;
}
const end = Math.min(sourceEnd ?? this.#length, this.#length,
(target.length - targetStart) + sourceStart);
const source = this.#buffer.subarray(sourceStart, end);
target.set(source, targetStart);
return source.length;
}
#enlarge() {
var old = this.#buffer;
this.#buffer = new Uint8Array(this.#buffer.length * 2);
this.#buffer.set(old.subarray(0, this.#length), 0);
}
/**
* @brief decode buffer as utf-8
* @param {Uint8Array|VarBuffer} [buffer]
* @return {string}
*/
decode(buffer = undefined) {
return VarBuffer.decode((buffer instanceof VarBuffer) ?
buffer.buffer : (buffer ?? this.buffer));
}
/**
* @brief decode buffer as utf-8
* @param {Uint8Array|VarBuffer} buffer
* @return {string}
*/
static decode(buffer) {
if (!decoder) {
decoder = new TextDecoder();
}
return decoder.decode((buffer instanceof VarBuffer) ?
buffer.buffer : buffer);
}
/**
* @brief encode a value to VarBuffer
* @param {string} value
* @return {VarBuffer}
*/
static encode(value) {
if (!encoder) {
encoder = new TextEncoder();
}
return new VarBuffer(encoder.encode(value));
}
toString() {
return this.decode(this.buffer);
}
}
export class LineBuffer extends VarBuffer {
static CR = 0x0D;
static LF = 0x0A;
lineTerm = LineBuffer.LF;
/**
* @returns {string|null} line from buffer
* @details returned line contains the terminating LF
*/
takeLine() {
const index = this.buffer.indexOf(this.lineTerm);
if (index >= 0) {
const ret = this.decode(this.subarray(0, index + 1)) ?? "";
this.shift(index + 1);
return ret;
}
return null;
}
/**
* @return {Generator<string>}
*/
* lines() {
for (let line = this.takeLine(); line !== null; line = this.takeLine())
yield line;
}
}
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