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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 | 18x | import { decode, encode } from 'utf8'; const defaultByteLength = 1024 * 8; export class IOBuffer { /** * @param data - The data to construct the IOBuffer with. * If data is a number, it will be the new buffer's length<br> * If data is `undefined`, the buffer will be initialized with a default length of 8Kb<br> * If data is an ArrayBuffer, SharedArrayBuffer, an ArrayBufferView (Typed Array), an IOBuffer instance, * or a Node.js Buffer, a view will be created over the underlying ArrayBuffer. * @param options */ constructor(data = defaultByteLength, options = {}) { let dataIsGiven = false; if (typeof data === 'number') { data = new ArrayBuffer(data); } else { dataIsGiven = true; this.lastWrittenByte = data.byteLength; } const offset = options.offset ? options.offset >>> 0 : 0; const byteLength = data.byteLength - offset; let dvOffset = offset; I if (ArrayBuffer.isView(data) || data instanceof IOBuffer) { I if (data.byteLength !== data.buffer.byteLength) { dvOffset = data.byteOffset + offset; } data = data.buffer; } if (dataIsGiven) { this.lastWrittenByte = byteLength; } else { this.lastWrittenByte = 0; } this.buffer = data; this.length = byteLength; this.byteLength = byteLength; this.byteOffset = dvOffset; this.offset = 0; this.littleEndian = true; this._data = new DataView(this.buffer, dvOffset, byteLength); this._mark = 0; this._marks = []; } /** * Checks if the memory allocated to the buffer is sufficient to store more * bytes after the offset. * @param byteLength - The needed memory in bytes. * @returns `true` if there is sufficient space and `false` otherwise. */ available(byteLength = 1) { return this.offset + byteLength <= this.length; } /** * Check if little-endian mode is used for reading and writing multi-byte * values. * @returns `true` if little-endian mode is used, `false` otherwise. */ isLittleEndian() { return this.littleEndian; } /** * Set little-endian mode for reading and writing multi-byte values. */ setLittleEndian() { this.littleEndian = true; return this; } /** * Check if big-endian mode is used for reading and writing multi-byte values. * @returns `true` if big-endian mode is used, `false` otherwise. */ isBigEndian() { return !this.littleEndian; } /** * Switches to big-endian mode for reading and writing multi-byte values. */ setBigEndian() { this.littleEndian = false; return this; } /** * Move the pointer n bytes forward. * @param n - Number of bytes to skip. */ skip(n = 1) { this.offset += n; return this; } /** * Move the pointer to the given offset. * @param offset */ seek(offset) { this.offset = offset; return this; } /** * Store the current pointer offset. * @see {@link IOBuffer#reset} */ mark() { this._mark = this.offset; return this; } /** * Move the pointer back to the last pointer offset set by mark. * @see {@link IOBuffer#mark} */ reset() { this.offset = this._mark; return this; } /** * Push the current pointer offset to the mark stack. * @see {@link IOBuffer#popMark} */ pushMark() { this._marks.push(this.offset); return this; } /** * Pop the last pointer offset from the mark stack, and set the current * pointer offset to the popped value. * @see {@link IOBuffer#pushMark} */ popMark() { const offset = this._marks.pop(); I if (offset === undefined) { throw new Error('Mark stack empty'); } this.seek(offset); return this; } /** * Move the pointer offset back to 0. */ rewind() { this.offset = 0; return this; } /** * Make sure the buffer has sufficient memory to write a given byteLength at * the current pointer offset. * If the buffer's memory is insufficient, this method will create a new * buffer (a copy) with a length that is twice (byteLength + current offset). * @param byteLength */ ensureAvailable(byteLength = 1) { I if (!this.available(byteLength)) { const lengthNeeded = this.offset + byteLength; const newLength = lengthNeeded * 2; const newArray = new Uint8Array(newLength); newArray.set(new Uint8Array(this.buffer)); this.buffer = newArray.buffer; this.length = this.byteLength = newLength; this._data = new DataView(this.buffer); } return this; } /** * Read a byte and return false if the byte's value is 0, or true otherwise. * Moves pointer forward by one byte. */ readBoolean() { return this.readUint8() !== 0; } /** * Read a signed 8-bit integer and move pointer forward by 1 byte. */ readInt8() { return this._data.getInt8(this.offset++); } /** * Read an unsigned 8-bit integer and move pointer forward by 1 byte. */ readUint8() { return this._data.getUint8(this.offset++); } /** * Alias for {@link IOBuffer#readUint8}. */ readByte() { return this.readUint8(); } /** * Read `n` bytes and move pointer forward by `n` bytes. */ readBytes(n = 1) { const bytes = new Uint8Array(n); for (let i = 0; i < n; i++) { bytes[i] = this.readByte(); } return bytes; } /** * Read a 16-bit signed integer and move pointer forward by 2 bytes. */ readInt16() { const value = this._data.getInt16(this.offset, this.littleEndian); this.offset += 2; return value; } /** * Read a 16-bit unsigned integer and move pointer forward by 2 bytes. */ readUint16() { const value = this._data.getUint16(this.offset, this.littleEndian); this.offset += 2; return value; } /** * Read a 32-bit signed integer and move pointer forward by 4 bytes. */ readInt32() { const value = this._data.getInt32(this.offset, this.littleEndian); this.offset += 4; return value; } /** * Read a 32-bit unsigned integer and move pointer forward by 4 bytes. */ readUint32() { const value = this._data.getUint32(this.offset, this.littleEndian); this.offset += 4; return value; } /** * Read a 32-bit floating number and move pointer forward by 4 bytes. */ readFloat32() { const value = this._data.getFloat32(this.offset, this.littleEndian); this.offset += 4; return value; } /** * Read a 64-bit floating number and move pointer forward by 8 bytes. */ readFloat64() { const value = this._data.getFloat64(this.offset, this.littleEndian); this.offset += 8; return value; } /** * Read a 1-byte ASCII character and move pointer forward by 1 byte. */ readChar() { return String.fromCharCode(this.readInt8()); } /** * Read `n` 1-byte ASCII characters and move pointer forward by `n` bytes. */ readChars(n = 1) { let result = ''; for (let i = 0; i < n; i++) { result += this.readChar(); } return result; } /** * Read the next `n` bytes, return a UTF-8 decoded string and move pointer * forward by `n` bytes. */ readUtf8(n = 1) { const bString = this.readChars(n); return decode(bString); } /** * Write 0xff if the passed value is truthy, 0x00 otherwise and move pointer * forward by 1 byte. */ writeBoolean(value) { this.writeUint8(value ? 0xff : 0x00); return this; } /** * Write `value` as an 8-bit signed integer and move pointer forward by 1 byte. */ writeInt8(value) { this.ensureAvailable(1); this._data.setInt8(this.offset++, value); this._updateLastWrittenByte(); return this; } /** * Write `value` as an 8-bit unsigned integer and move pointer forward by 1 * byte. */ writeUint8(value) { this.ensureAvailable(1); this._data.setUint8(this.offset++, value); this._updateLastWrittenByte(); return this; } /** * An alias for {@link IOBuffer#writeUint8}. */ writeByte(value) { return this.writeUint8(value); } /** * Write all elements of `bytes` as uint8 values and move pointer forward by * `bytes.length` bytes. */ writeBytes(bytes) { this.ensureAvailable(bytes.length); for (let i = 0; i < bytes.length; i++) { this._data.setUint8(this.offset++, bytes[i]); } this._updateLastWrittenByte(); return this; } /** * Write `value` as a 16-bit signed integer and move pointer forward by 2 * bytes. */ writeInt16(value) { this.ensureAvailable(2); this._data.setInt16(this.offset, value, this.littleEndian); this.offset += 2; this._updateLastWrittenByte(); return this; } /** * Write `value` as a 16-bit unsigned integer and move pointer forward by 2 * bytes. */ writeUint16(value) { this.ensureAvailable(2); this._data.setUint16(this.offset, value, this.littleEndian); this.offset += 2; this._updateLastWrittenByte(); return this; } /** * Write `value` as a 32-bit signed integer and move pointer forward by 4 * bytes. */ writeInt32(value) { this.ensureAvailable(4); this._data.setInt32(this.offset, value, this.littleEndian); this.offset += 4; this._updateLastWrittenByte(); return this; } /** * Write `value` as a 32-bit unsigned integer and move pointer forward by 4 * bytes. */ writeUint32(value) { this.ensureAvailable(4); this._data.setUint32(this.offset, value, this.littleEndian); this.offset += 4; this._updateLastWrittenByte(); return this; } /** * Write `value` as a 32-bit floating number and move pointer forward by 4 * bytes. */ writeFloat32(value) { this.ensureAvailable(4); this._data.setFloat32(this.offset, value, this.littleEndian); this.offset += 4; this._updateLastWrittenByte(); return this; } /** * Write `value` as a 64-bit floating number and move pointer forward by 8 * bytes. */ writeFloat64(value) { this.ensureAvailable(8); this._data.setFloat64(this.offset, value, this.littleEndian); this.offset += 8; this._updateLastWrittenByte(); return this; } /** * Write the charCode of `str`'s first character as an 8-bit unsigned integer * and move pointer forward by 1 byte. */ writeChar(str) { return this.writeUint8(str.charCodeAt(0)); } /** * Write the charCodes of all `str`'s characters as 8-bit unsigned integers * and move pointer forward by `str.length` bytes. */ writeChars(str) { for (let i = 0; i < str.length; i++) { this.writeUint8(str.charCodeAt(i)); } return this; } /** * UTF-8 encode and write `str` to the current pointer offset and move pointer * forward according to the encoded length. */ writeUtf8(str) { const bString = encode(str); return this.writeChars(bString); } /** * Export a Uint8Array view of the internal buffer. * The view starts at the byte offset and its length * is calculated to stop at the last written byte or the original length. */ toArray() { return new Uint8Array(this.buffer, this.byteOffset, this.lastWrittenByte); } /** * Update the last written byte offset * @private */ _updateLastWrittenByte() { I if (this.offset > this.lastWrittenByte) { this.lastWrittenByte = this.offset; } } } //# sourceMappingURL=IOBuffer.js.map |