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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 20x 1x 1x 1x 19x 12x 12x 12x 7x 7x 7x 20x 1x 1x 9x 9x 1x 1x 1x 1x 1x 29x 6x 6x 29x 1x 1x 29x 29x 29x 29x 1x 1x 1x 75x 75x 1x 1x 21x 21x 1x 1x 1x 1x 1x 1x 1x 17x 17x 1x 1x 1x 4x 4x 1x 1x 1x 6x 1x 1x 6x 6x 6x 1x 1x 1x 1x 1x 1x 10x 10x 9x 9x 10x 9x 10x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 16x 8x 8x 16x 2x 2x 16x 16x 16x 16x 16x 16x 1x 1x 2x 2x 2x 2x 1x 1x 1x 1x 1x 1x 1x 18x 18x 18x 1x 1x 1x 1x 1x 1x 1x 27x 1x 1x 27x 27x 27x 1x 1x 1x 1x 1x 1x 1x 11x 1x 1x 11x 11x 1x 1x 10x 10x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 8x 8x 7x 7x 7x 7x 1x 8x 1x 1x 1x 1x 1x 1x 1x 1x 1x | // @ts-check // 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; } } |