How to use buf method in wpt
Best JavaScript code snippet using wpt
mimeOfBuffer.js
Source:mimeOfBuffer.js 
1/* eslint complexity: 0 */2// from file-type by @sindresorhus under the MIT license3// https://github.com/sindresorhus/file-type4function mimeOfBuffer(input) {5 const buf = new Uint8Array(input);6 if (!(buf && buf.length > 1)) {7 return null;8 }9 if (buf[0] === 0xFF && buf[1] === 0xD8 && buf[2] === 0xFF) {10 return {11 ext: 'jpg',12 mime: 'image/jpeg',13 };14 }15 if (buf[0] === 0x89 && buf[1] === 0x50 && buf[2] === 0x4E && buf[3] === 0x47) {16 return {17 ext: 'png',18 mime: 'image/png',19 };20 }21 if (buf[0] === 0x47 && buf[1] === 0x49 && buf[2] === 0x46) {22 return {23 ext: 'gif',24 mime: 'image/gif',25 };26 }27 if (buf[8] === 0x57 && buf[9] === 0x45 && buf[10] === 0x42 && buf[11] === 0x50) {28 return {29 ext: 'webp',30 mime: 'image/webp',31 };32 }33 if (buf[0] === 0x46 && buf[1] === 0x4C && buf[2] === 0x49 && buf[3] === 0x46) {34 return {35 ext: 'flif',36 mime: 'image/flif',37 };38 }39 // needs to be before `tif` check40 if (41 ((buf[0] === 0x49 && buf[1] === 0x49 && buf[2] === 0x2A && buf[3] === 0x0) ||42 (buf[0] === 0x4D && buf[1] === 0x4D && buf[2] === 0x0 && buf[3] === 0x2A)) && buf[8] === 0x43 && buf[9] === 0x5243 ) {44 return {45 ext: 'cr2',46 mime: 'image/x-canon-cr2',47 };48 }49 if (50 (buf[0] === 0x49 && buf[1] === 0x49 && buf[2] === 0x2A && buf[3] === 0x0) ||51 (buf[0] === 0x4D && buf[1] === 0x4D && buf[2] === 0x0 && buf[3] === 0x2A)52 ) {53 return {54 ext: 'tif',55 mime: 'image/tiff',56 };57 }58 if (buf[0] === 0x42 && buf[1] === 0x4D) {59 return {60 ext: 'bmp',61 mime: 'image/bmp',62 };63 }64 if (buf[0] === 0x49 && buf[1] === 0x49 && buf[2] === 0xBC) {65 return {66 ext: 'jxr',67 mime: 'image/vnd.ms-photo',68 };69 }70 if (buf[0] === 0x38 && buf[1] === 0x42 && buf[2] === 0x50 && buf[3] === 0x53) {71 return {72 ext: 'psd',73 mime: 'image/vnd.adobe.photoshop',74 };75 }76 // needs to be before `zip` check77 if (78 buf[0] === 0x50 && buf[1] === 0x4B && buf[2] === 0x3 && buf[3] === 0x4 && buf[30] === 0x6D && buf[31] === 0x69 &&79 buf[32] === 0x6D && buf[33] === 0x65 && buf[34] === 0x74 && buf[35] === 0x79 && buf[36] === 0x70 &&80 buf[37] === 0x65 && buf[38] === 0x61 && buf[39] === 0x70 && buf[40] === 0x70 && buf[41] === 0x6C &&81 buf[42] === 0x69 && buf[43] === 0x63 && buf[44] === 0x61 && buf[45] === 0x74 && buf[46] === 0x69 &&82 buf[47] === 0x6F && buf[48] === 0x6E && buf[49] === 0x2F && buf[50] === 0x65 && buf[51] === 0x70 &&83 buf[52] === 0x75 && buf[53] === 0x62 && buf[54] === 0x2B && buf[55] === 0x7A && buf[56] === 0x69 &&84 buf[57] === 0x7085 ) {86 return {87 ext: 'epub',88 mime: 'application/epub+zip',89 };90 }91 // needs to be before `zip` check92 // assumes signed .xpi from addons.mozilla.org93 if (94 buf[0] === 0x50 && buf[1] === 0x4B && buf[2] === 0x3 && buf[3] === 0x4 && buf[30] === 0x4D && buf[31] === 0x45 &&95 buf[32] === 0x54 && buf[33] === 0x41 && buf[34] === 0x2D && buf[35] === 0x49 && buf[36] === 0x4E &&96 buf[37] === 0x46 && buf[38] === 0x2F && buf[39] === 0x6D && buf[40] === 0x6F && buf[41] === 0x7A &&97 buf[42] === 0x69 && buf[43] === 0x6C && buf[44] === 0x6C && buf[45] === 0x61 && buf[46] === 0x2E &&98 buf[47] === 0x72 && buf[48] === 0x73 && buf[49] === 0x6199 ) {100 return {101 ext: 'xpi',102 mime: 'application/x-xpinstall',103 };104 }105 if (106 buf[0] === 0x50 && buf[1] === 0x4B && (buf[2] === 0x3 || buf[2] === 0x5 || buf[2] === 0x7) &&107 (buf[3] === 0x4 || buf[3] === 0x6 || buf[3] === 0x8)108 ) {109 return {110 ext: 'zip',111 mime: 'application/zip',112 };113 }114 if (buf[257] === 0x75 && buf[258] === 0x73 && buf[259] === 0x74 && buf[260] === 0x61 && buf[261] === 0x72) {115 return {116 ext: 'tar',117 mime: 'application/x-tar',118 };119 }120 if (121 buf[0] === 0x52 && buf[1] === 0x61 && buf[2] === 0x72 && buf[3] === 0x21 && buf[4] === 0x1A && buf[5] === 0x7 &&122 (buf[6] === 0x0 || buf[6] === 0x1)123 ) {124 return {125 ext: 'rar',126 mime: 'application/x-rar-compressed',127 };128 }129 if (buf[0] === 0x1F && buf[1] === 0x8B && buf[2] === 0x8) {130 return {131 ext: 'gz',132 mime: 'application/gzip',133 };134 }135 if (buf[0] === 0x42 && buf[1] === 0x5A && buf[2] === 0x68) {136 return {137 ext: 'bz2',138 mime: 'application/x-bzip2',139 };140 }141 if (buf[0] === 0x37 && buf[1] === 0x7A && buf[2] === 0xBC && buf[3] === 0xAF && buf[4] === 0x27 && buf[5] === 0x1C) {142 return {143 ext: '7z',144 mime: 'application/x-7z-compressed',145 };146 }147 if (buf[0] === 0x78 && buf[1] === 0x01) {148 return {149 ext: 'dmg',150 mime: 'application/x-apple-diskimage',151 };152 }153 if (154 (buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && (buf[3] === 0x18 || buf[3] === 0x20) && buf[4] === 0x66 &&155 buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70) ||156 (buf[0] === 0x33 && buf[1] === 0x67 && buf[2] === 0x70 && buf[3] === 0x35) ||157 (buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && buf[3] === 0x1C && buf[4] === 0x66 && buf[5] === 0x74 &&158 buf[6] === 0x79 && buf[7] === 0x70 && buf[8] === 0x6D && buf[9] === 0x70 && buf[10] === 0x34 &&159 buf[11] === 0x32 && buf[16] === 0x6D && buf[17] === 0x70 && buf[18] === 0x34 && buf[19] === 0x31 &&160 buf[20] === 0x6D && buf[21] === 0x70 && buf[22] === 0x34 && buf[23] === 0x32 && buf[24] === 0x69 &&161 buf[25] === 0x73 && buf[26] === 0x6F && buf[27] === 0x6D) ||162 (buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && buf[3] === 0x1C && buf[4] === 0x66 && buf[5] === 0x74 &&163 buf[6] === 0x79 && buf[7] === 0x70 && buf[8] === 0x69 && buf[9] === 0x73 && buf[10] === 0x6F &&164 buf[11] === 0x6D) ||165 (buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && buf[3] === 0x1c && buf[4] === 0x66 && buf[5] === 0x74 &&166 buf[6] === 0x79 && buf[7] === 0x70 && buf[8] === 0x6D && buf[9] === 0x70 && buf[10] === 0x34 &&167 buf[11] === 0x32 && buf[12] === 0x0 && buf[13] === 0x0 && buf[14] === 0x0 && buf[15] === 0x0)168 ) {169 return {170 ext: 'mp4',171 mime: 'video/mp4',172 };173 }174 if (175 buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && buf[3] === 0x1C && buf[4] === 0x66 &&176 buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70 && buf[8] === 0x4D && buf[9] === 0x34 && buf[10] === 0x56177 ) {178 return {179 ext: 'm4v',180 mime: 'video/x-m4v',181 };182 }183 if (buf[0] === 0x4D && buf[1] === 0x54 && buf[2] === 0x68 && buf[3] === 0x64) {184 return {185 ext: 'mid',186 mime: 'audio/midi',187 };188 }189 // https://github.com/threatstack/libmagic/blob/master/magic/Magdir/matroska190 if (buf[0] === 0x1A && buf[1] === 0x45 && buf[2] === 0xDF && buf[3] === 0xA3) {191 const sliced = buf.subarray(4, 4 + 4096);192 const idPos = sliced.findIndex((el, i, arr) => arr[i] === 0x42 && arr[i + 1] === 0x82);193 if (idPos >= 0) {194 const docTypePos = idPos + 3;195 const findDocType = (type) => Array.from(type).every((c, i) => sliced[docTypePos + i] === c.charCodeAt(0));196 if (findDocType('matroska')) {197 return {198 ext: 'mkv',199 mime: 'video/x-matroska',200 };201 }202 if (findDocType('webm')) {203 return {204 ext: 'webm',205 mime: 'video/webm',206 };207 }208 }209 }210 if (211 buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x0 && buf[3] === 0x14 && buf[4] === 0x66 && buf[5] === 0x74 &&212 buf[6] === 0x79 && buf[7] === 0x70213 ) {214 return {215 ext: 'mov',216 mime: 'video/quicktime',217 };218 }219 if (220 buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46 && buf[8] === 0x41 && buf[9] === 0x56 &&221 buf[10] === 0x49222 ) {223 return {224 ext: 'avi',225 mime: 'video/x-msvideo',226 };227 }228 if (229 buf[0] === 0x30 && buf[1] === 0x26 && buf[2] === 0xB2 && buf[3] === 0x75 && buf[4] === 0x8E && buf[5] === 0x66 &&230 buf[6] === 0xCF && buf[7] === 0x11 && buf[8] === 0xA6 && buf[9] === 0xD9231 ) {232 return {233 ext: 'wmv',234 mime: 'video/x-ms-wmv',235 };236 }237 if (buf[0] === 0x0 && buf[1] === 0x0 && buf[2] === 0x1 && buf[3].toString(16)[0] === 'b') {238 return {239 ext: 'mpg',240 mime: 'video/mpeg',241 };242 }243 if ((buf[0] === 0x49 && buf[1] === 0x44 && buf[2] === 0x33) || (buf[0] === 0xFF && buf[1] === 0xfb)) {244 return {245 ext: 'mp3',246 mime: 'audio/mpeg',247 };248 }249 if ((buf[4] === 0x66 && buf[5] === 0x74 && buf[6] === 0x79 && buf[7] === 0x70 && buf[8] === 0x4D &&250 buf[9] === 0x34 && buf[10] === 0x41) || (buf[0] === 0x4D && buf[1] === 0x34 && buf[2] === 0x41 && buf[3] === 0x20)251 ) {252 return {253 ext: 'm4a',254 mime: 'audio/m4a',255 };256 }257 // needs to be before `ogg` check258 if (259 buf[28] === 0x4F && buf[29] === 0x70 && buf[30] === 0x75 && buf[31] === 0x73 && buf[32] === 0x48 &&260 buf[33] === 0x65 && buf[34] === 0x61 && buf[35] === 0x64261 ) {262 return {263 ext: 'opus',264 mime: 'audio/opus',265 };266 }267 if (buf[0] === 0x4F && buf[1] === 0x67 && buf[2] === 0x67 && buf[3] === 0x53) {268 return {269 ext: 'ogg',270 mime: 'audio/ogg',271 };272 }273 if (buf[0] === 0x66 && buf[1] === 0x4C && buf[2] === 0x61 && buf[3] === 0x43) {274 return {275 ext: 'flac',276 mime: 'audio/x-flac',277 };278 }279 if (280 buf[0] === 0x52 && buf[1] === 0x49 && buf[2] === 0x46 && buf[3] === 0x46 && buf[8] === 0x57 && buf[9] === 0x41 &&281 buf[10] === 0x56 && buf[11] === 0x45282 ) {283 return {284 ext: 'wav',285 mime: 'audio/x-wav',286 };287 }288 if (buf[0] === 0x23 && buf[1] === 0x21 && buf[2] === 0x41 && buf[3] === 0x4D && buf[4] === 0x52 && buf[5] === 0x0A) {289 return {290 ext: 'amr',291 mime: 'audio/amr',292 };293 }294 if (buf[0] === 0x25 && buf[1] === 0x50 && buf[2] === 0x44 && buf[3] === 0x46) {295 return {296 ext: 'pdf',297 mime: 'application/pdf',298 };299 }300 if (buf[0] === 0x4D && buf[1] === 0x5A) {301 return {302 ext: 'exe',303 mime: 'application/x-msdownload',304 };305 }306 if ((buf[0] === 0x43 || buf[0] === 0x46) && buf[1] === 0x57 && buf[2] === 0x53) {307 return {308 ext: 'swf',309 mime: 'application/x-shockwave-flash',310 };311 }312 if (buf[0] === 0x7B && buf[1] === 0x5C && buf[2] === 0x72 && buf[3] === 0x74 && buf[4] === 0x66) {313 return {314 ext: 'rtf',315 mime: 'application/rtf',316 };317 }318 if (319 (buf[0] === 0x77 && buf[1] === 0x4F && buf[2] === 0x46 && buf[3] === 0x46) &&320 (321 (buf[4] === 0x00 && buf[5] === 0x01 && buf[6] === 0x00 && buf[7] === 0x00) ||322 (buf[4] === 0x4F && buf[5] === 0x54 && buf[6] === 0x54 && buf[7] === 0x4F)323 )324 ) {325 return {326 ext: 'woff',327 mime: 'application/font-woff',328 };329 }330 if (331 (buf[0] === 0x77 && buf[1] === 0x4F && buf[2] === 0x46 && buf[3] === 0x32) &&332 (333 (buf[4] === 0x00 && buf[5] === 0x01 && buf[6] === 0x00 && buf[7] === 0x00) ||334 (buf[4] === 0x4F && buf[5] === 0x54 && buf[6] === 0x54 && buf[7] === 0x4F)335 )336 ) {337 return {338 ext: 'woff2',339 mime: 'application/font-woff',340 };341 }342 if (343 (buf[34] === 0x4C && buf[35] === 0x50) &&344 (345 (buf[8] === 0x00 && buf[9] === 0x00 && buf[10] === 0x01) ||346 (buf[8] === 0x01 && buf[9] === 0x00 && buf[10] === 0x02) ||347 (buf[8] === 0x02 && buf[9] === 0x00 && buf[10] === 0x02)348 )349 ) {350 return {351 ext: 'eot',352 mime: 'application/octet-stream',353 };354 }355 if (buf[0] === 0x00 && buf[1] === 0x01 && buf[2] === 0x00 && buf[3] === 0x00 && buf[4] === 0x00) {356 return {357 ext: 'ttf',358 mime: 'application/font-sfnt',359 };360 }361 if (buf[0] === 0x4F && buf[1] === 0x54 && buf[2] === 0x54 && buf[3] === 0x4F && buf[4] === 0x00) {362 return {363 ext: 'otf',364 mime: 'application/font-sfnt',365 };366 }367 if (buf[0] === 0x00 && buf[1] === 0x00 && buf[2] === 0x01 && buf[3] === 0x00) {368 return {369 ext: 'ico',370 mime: 'image/x-icon',371 };372 }373 if (buf[0] === 0x46 && buf[1] === 0x4C && buf[2] === 0x56 && buf[3] === 0x01) {374 return {375 ext: 'flv',376 mime: 'video/x-flv',377 };378 }379 if (buf[0] === 0x25 && buf[1] === 0x21) {380 return {381 ext: 'ps',382 mime: 'application/postscript',383 };384 }385 if (buf[0] === 0xFD && buf[1] === 0x37 && buf[2] === 0x7A && buf[3] === 0x58 && buf[4] === 0x5A && buf[5] === 0x00) {386 return {387 ext: 'xz',388 mime: 'application/x-xz',389 };390 }391 if (buf[0] === 0x53 && buf[1] === 0x51 && buf[2] === 0x4C && buf[3] === 0x69) {392 return {393 ext: 'sqlite',394 mime: 'application/x-sqlite3',395 };396 }397 if (buf[0] === 0x4E && buf[1] === 0x45 && buf[2] === 0x53 && buf[3] === 0x1A) {398 return {399 ext: 'nes',400 mime: 'application/x-nintendo-nes-rom',401 };402 }403 if (buf[0] === 0x43 && buf[1] === 0x72 && buf[2] === 0x32 && buf[3] === 0x34) {404 return {405 ext: 'crx',406 mime: 'application/x-google-chrome-extension',407 };408 }409 if (410 (buf[0] === 0x4D && buf[1] === 0x53 && buf[2] === 0x43 && buf[3] === 0x46) ||411 (buf[0] === 0x49 && buf[1] === 0x53 && buf[2] === 0x63 && buf[3] === 0x28)412 ) {413 return {414 ext: 'cab',415 mime: 'application/vnd.ms-cab-compressed',416 };417 }418 // needs to be before `ar` check419 if (420 buf[0] === 0x21 && buf[1] === 0x3C && buf[2] === 0x61 && buf[3] === 0x72 && buf[4] === 0x63 && buf[5] === 0x68 &&421 buf[6] === 0x3E && buf[7] === 0x0A && buf[8] === 0x64 && buf[9] === 0x65 && buf[10] === 0x62 && buf[11] === 0x69 &&422 buf[12] === 0x61 && buf[13] === 0x6E && buf[14] === 0x2D && buf[15] === 0x62 && buf[16] === 0x69 &&423 buf[17] === 0x6E && buf[18] === 0x61 && buf[19] === 0x72 && buf[20] === 0x79424 ) {425 return {426 ext: 'deb',427 mime: 'application/x-deb',428 };429 }430 if (431 buf[0] === 0x21 && buf[1] === 0x3C && buf[2] === 0x61 && buf[3] === 0x72 && buf[4] === 0x63 && buf[5] === 0x68 &&432 buf[6] === 0x3E433 ) {434 return {435 ext: 'ar',436 mime: 'application/x-unix-archive',437 };438 }439 if (buf[0] === 0xED && buf[1] === 0xAB && buf[2] === 0xEE && buf[3] === 0xDB) {440 return {441 ext: 'rpm',442 mime: 'application/x-rpm',443 };444 }445 if (446 (buf[0] === 0x1F && buf[1] === 0xA0) ||447 (buf[0] === 0x1F && buf[1] === 0x9D)448 ) {449 return {450 ext: 'Z',451 mime: 'application/x-compress',452 };453 }454 if (buf[0] === 0x4C && buf[1] === 0x5A && buf[2] === 0x49 && buf[3] === 0x50) {455 return {456 ext: 'lz',457 mime: 'application/x-lzip',458 };459 }460 if (461 buf[0] === 0xD0 && buf[1] === 0xCF && buf[2] === 0x11 && buf[3] === 0xE0 && buf[4] === 0xA1 && buf[5] === 0xB1 &&462 buf[6] === 0x1A && buf[7] === 0xE1463 ) {464 return {465 ext: 'msi',466 mime: 'application/x-msi',467 };468 }469 if (470 buf[0] === 0x06 && buf[1] === 0x0E && buf[2] === 0x2B && buf[3] === 0x34 && buf[4] === 0x02 && buf[5] === 0x05 &&471 buf[6] === 0x01 && buf[7] === 0x01 && buf[8] === 0x0D && buf[9] === 0x01 && buf[10] === 0x02 && buf[11] === 0x01 &&472 buf[12] === 0x01 && buf[13] === 0x02473 ) {474 return {475 ext: 'mxf',476 mime: 'application/mxf',477 };478 }479 return null;480}...
test-buffer-swap.js
Source:test-buffer-swap.js
1'use strict';2require('../common');3const assert = require('assert');4// Test buffers small enough to use the JS implementation5{6 const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,7 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);8 assert.strictEqual(buf, buf.swap16());9 assert.deepStrictEqual(buf, Buffer.from([0x02, 0x01, 0x04, 0x03, 0x06, 0x05,10 0x08, 0x07, 0x0a, 0x09, 0x0c, 0x0b,11 0x0e, 0x0d, 0x10, 0x0f]));12 buf.swap16(); // restore13 assert.strictEqual(buf, buf.swap32());14 assert.deepStrictEqual(buf, Buffer.from([0x04, 0x03, 0x02, 0x01, 0x08, 0x07,15 0x06, 0x05, 0x0c, 0x0b, 0x0a, 0x09,16 0x10, 0x0f, 0x0e, 0x0d]));17 buf.swap32(); // restore18 assert.strictEqual(buf, buf.swap64());19 assert.deepStrictEqual(buf, Buffer.from([0x08, 0x07, 0x06, 0x05, 0x04, 0x03,20 0x02, 0x01, 0x10, 0x0f, 0x0e, 0x0d,21 0x0c, 0x0b, 0x0a, 0x09]));22}23// Operates in-place24{25 const buf = Buffer.from([0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]);26 buf.slice(1, 5).swap32();27 assert.deepStrictEqual(buf, Buffer.from([0x1, 0x5, 0x4, 0x3, 0x2, 0x6, 0x7]));28 buf.slice(1, 5).swap16();29 assert.deepStrictEqual(buf, Buffer.from([0x1, 0x4, 0x5, 0x2, 0x3, 0x6, 0x7]));30 // Length assertions31 const re16 = /Buffer size must be a multiple of 16-bits/;32 const re32 = /Buffer size must be a multiple of 32-bits/;33 const re64 = /Buffer size must be a multiple of 64-bits/;34 assert.throws(() => Buffer.from(buf).swap16(), re16);35 assert.throws(() => Buffer.alloc(1025).swap16(), re16);36 assert.throws(() => Buffer.from(buf).swap32(), re32);37 assert.throws(() => buf.slice(1, 3).swap32(), re32);38 assert.throws(() => Buffer.alloc(1025).swap32(), re32);39 assert.throws(() => buf.slice(1, 3).swap64(), re64);40 assert.throws(() => Buffer.alloc(1025).swap64(), re64);41}42{43 const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,44 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,45 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,46 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10]);47 buf.slice(2, 18).swap64();48 assert.deepStrictEqual(buf, Buffer.from([0x01, 0x02, 0x0a, 0x09, 0x08, 0x07,49 0x06, 0x05, 0x04, 0x03, 0x02, 0x01,50 0x10, 0x0f, 0x0e, 0x0d, 0x0c, 0x0b,51 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,52 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,53 0x0f, 0x10]));54}55// Force use of native code (Buffer size above threshold limit for js impl)56{57 const bufData = new Uint32Array(256).fill(0x04030201);58 const buf = Buffer.from(bufData.buffer, bufData.byteOffset);59 const otherBufData = new Uint32Array(256).fill(0x03040102);60 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);61 buf.swap16();62 assert.deepStrictEqual(buf, otherBuf);63}64{65 const bufData = new Uint32Array(256).fill(0x04030201);66 const buf = Buffer.from(bufData.buffer);67 const otherBufData = new Uint32Array(256).fill(0x01020304);68 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);69 buf.swap32();70 assert.deepStrictEqual(buf, otherBuf);71}72{73 const bufData = new Uint8Array(256 * 8);74 const otherBufData = new Uint8Array(256 * 8);75 for (let i = 0; i < bufData.length; i++) {76 bufData[i] = i % 8;77 otherBufData[otherBufData.length - i - 1] = i % 8;78 }79 const buf = Buffer.from(bufData.buffer, bufData.byteOffset);80 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);81 buf.swap64();82 assert.deepStrictEqual(buf, otherBuf);83}84// Test native code with buffers that are not memory-aligned85{86 const bufData = new Uint8Array(256 * 8);87 const otherBufData = new Uint8Array(256 * 8 - 2);88 for (let i = 0; i < bufData.length; i++) {89 bufData[i] = i % 2;90 }91 for (let i = 1; i < otherBufData.length; i++) {92 otherBufData[otherBufData.length - i] = (i + 1) % 2;93 }94 const buf = Buffer.from(bufData.buffer, bufData.byteOffset);95 // 0|1 0|1 0|1...96 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);97 // 0|0 1|0 1|0...98 buf.slice(1, buf.length - 1).swap16();99 assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);100}101{102 const bufData = new Uint8Array(256 * 8);103 const otherBufData = new Uint8Array(256 * 8 - 4);104 for (let i = 0; i < bufData.length; i++) {105 bufData[i] = i % 4;106 }107 for (let i = 1; i < otherBufData.length; i++) {108 otherBufData[otherBufData.length - i] = (i + 1) % 4;109 }110 const buf = Buffer.from(bufData.buffer, bufData.byteOffset);111 // 0|1 2 3 0|1 2 3...112 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);113 // 0|0 3 2 1|0 3 2...114 buf.slice(1, buf.length - 3).swap32();115 assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);116}117{118 const bufData = new Uint8Array(256 * 8);119 const otherBufData = new Uint8Array(256 * 8 - 8);120 for (let i = 0; i < bufData.length; i++) {121 bufData[i] = i % 8;122 }123 for (let i = 1; i < otherBufData.length; i++) {124 otherBufData[otherBufData.length - i] = (i + 1) % 8;125 }126 const buf = Buffer.from(bufData.buffer, bufData.byteOffset);127 // 0|1 2 3 4 5 6 7 0|1 2 3 4...128 const otherBuf = Buffer.from(otherBufData.buffer, otherBufData.byteOffset);129 // 0|0 7 6 5 4 3 2 1|0 7 6 5...130 buf.slice(1, buf.length - 7).swap64();131 assert.deepStrictEqual(buf.slice(0, otherBuf.length), otherBuf);...
message.js
Source:message.js
1"use strict";23const Buffer = require("buffer").Buffer;4const torrentParser = require("./torrent-parser");5const util = require("./util");67module.exports.buildHandshake = (torrent) => {8 const buf = Buffer.alloc(68);9 // pstrlen10 buf.writeUInt8(19, 0);11 // pstr12 buf.write("BitTorrent protocol", 1);13 // reserved14 buf.writeUInt32BE(0, 20);15 buf.writeUInt32BE(0, 24);16 // info hash17 torrentParser.infoHash(torrent).copy(buf, 28);18 // peer id19 util.genId().copy(buf, 48);20 return buf;21};2223module.exports.buildKeepAlive = () => Buffer.alloc(4);2425module.exports.buildChoke = () => {26 const buf = Buffer.alloc(5);27 // length28 buf.writeUInt32BE(1, 0);29 // id30 buf.writeUInt8(0, 4);31 return buf;32};3334module.exports.buildUnchoke = () => {35 const buf = Buffer.alloc(5);36 // length37 buf.writeUInt32BE(1, 0);38 // id39 buf.writeUInt8(1, 4);40 return buf;41};4243module.exports.buildInterested = () => {44 const buf = Buffer.alloc(5);45 // length46 buf.writeUInt32BE(1, 0);47 // id48 buf.writeUInt8(2, 4);49 return buf;50};5152module.exports.buildUninterested = () => {53 const buf = Buffer.alloc(5);54 // length55 buf.writeUInt32BE(1, 0);56 // id57 buf.writeUInt8(3, 4);58 return buf;59};6061module.exports.buildHave = (payload) => {62 const buf = Buffer.alloc(9);63 // length64 buf.writeUInt32BE(5, 0);65 // id66 buf.writeUInt8(4, 4);67 // piece index68 buf.writeUInt32BE(payload, 5);69 return buf;70};7172module.exports.buildBitfield = (bitfield) => {73 const buf = Buffer.alloc(14);74 // length75 buf.writeUInt32BE(payload.length + 1, 0);76 // id77 buf.writeUInt8(5, 4);78 // bitfield79 bitfield.copy(buf, 5);80 return buf;81};8283module.exports.buildRequest = (payload) => {84 const buf = Buffer.alloc(17);85 // length86 buf.writeUInt32BE(13, 0);87 // id88 buf.writeUInt8(6, 4);89 // piece index90 buf.writeUInt32BE(payload.index, 5);91 // begin92 buf.writeUInt32BE(payload.begin, 9);93 // length94 buf.writeUInt32BE(payload.length, 13);95 return buf;96};9798module.exports.buildPiece = (payload) => {99 const buf = Buffer.alloc(payload.block.length + 13);100 // length101 buf.writeUInt32BE(payload.block.length + 9, 0);102 // id103 buf.writeUInt8(7, 4);104 // piece index105 buf.writeUInt32BE(payload.index, 5);106 // begin107 buf.writeUInt32BE(payload.begin, 9);108 // block109 payload.block.copy(buf, 13);110 return buf;111};112113module.exports.buildCancel = (payload) => {114 const buf = Buffer.alloc(17);115 // length116 buf.writeUInt32BE(13, 0);117 // id118 buf.writeUInt8(8, 4);119 // piece index120 buf.writeUInt32BE(payload.index, 5);121 // begin122 buf.writeUInt32BE(payload.begin, 9);123 // length124 buf.writeUInt32BE(payload.length, 13);125 return buf;126};127128module.exports.buildPort = (payload) => {129 const buf = Buffer.alloc(7);130 // length131 buf.writeUInt32BE(3, 0);132 // id133 buf.writeUInt8(9, 4);134 // listen-port135 buf.writeUInt16BE(payload, 5);136 return buf;137};138139module.exports.parse = (msg) => {140 const id = msg.length > 4 ? msg.readInt8(4) : null;141 let payload = msg.length > 5 ? msg.slice(5) : null;142 if (id === 6 || id === 7 || id === 8) {143 const rest = payload.slice(8);144 payload = {145 index: payload.readInt32BE(0),146 begin: payload.readInt32BE(4),147 };148 payload[id === 7 ? "block" : "length"] = rest;149 }150151 return {152 size: msg.readInt32BE(0),153 id: id,154 payload: payload,155 };
...
auto.js
Source:auto.js
1// Copyright 2018 Joyent, Inc.2module.exports = {3 read: read,4 write: write5};6var assert = require('assert-plus');7var Buffer = require('safer-buffer').Buffer;8var utils = require('../utils');9var Key = require('../key');10var PrivateKey = require('../private-key');11var pem = require('./pem');12var ssh = require('./ssh');13var rfc4253 = require('./rfc4253');14var dnssec = require('./dnssec');15var putty = require('./putty');16var DNSSEC_PRIVKEY_HEADER_PREFIX = 'Private-key-format: v1';17function read(buf, options) {18 if (typeof (buf) === 'string') {19 if (buf.trim().match(/^[-]+[ ]*BEGIN/))20 return (pem.read(buf, options));21 if (buf.match(/^\s*ssh-[a-z]/))22 return (ssh.read(buf, options));23 if (buf.match(/^\s*ecdsa-/))24 return (ssh.read(buf, options));25 if (buf.match(/^putty-user-key-file-2:/i))26 return (putty.read(buf, options));27 if (findDNSSECHeader(buf))28 return (dnssec.read(buf, options));29 buf = Buffer.from(buf, 'binary');30 } else {31 assert.buffer(buf);32 if (findPEMHeader(buf))33 return (pem.read(buf, options));34 if (findSSHHeader(buf))35 return (ssh.read(buf, options));36 if (findPuTTYHeader(buf))37 return (putty.read(buf, options));38 if (findDNSSECHeader(buf))39 return (dnssec.read(buf, options));40 }41 if (buf.readUInt32BE(0) < buf.length)42 return (rfc4253.read(buf, options));43 throw (new Error('Failed to auto-detect format of key'));44}45function findPuTTYHeader(buf) {46 var offset = 0;47 while (offset < buf.length &&48 (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))49 ++offset;50 if (offset + 22 <= buf.length &&51 buf.slice(offset, offset + 22).toString('ascii').toLowerCase() ===52 'putty-user-key-file-2:')53 return (true);54 return (false);55}56function findSSHHeader(buf) {57 var offset = 0;58 while (offset < buf.length &&59 (buf[offset] === 32 || buf[offset] === 10 || buf[offset] === 9))60 ++offset;61 if (offset + 4 <= buf.length &&62 buf.slice(offset, offset + 4).toString('ascii') === 'ssh-')63 return (true);64 if (offset + 6 <= buf.length &&65 buf.slice(offset, offset + 6).toString('ascii') === 'ecdsa-')66 return (true);67 return (false);68}69function findPEMHeader(buf) {70 var offset = 0;71 while (offset < buf.length &&72 (buf[offset] === 32 || buf[offset] === 10))73 ++offset;74 if (buf[offset] !== 45)75 return (false);76 while (offset < buf.length &&77 (buf[offset] === 45))78 ++offset;79 while (offset < buf.length &&80 (buf[offset] === 32))81 ++offset;82 if (offset + 5 > buf.length ||83 buf.slice(offset, offset + 5).toString('ascii') !== 'BEGIN')84 return (false);85 return (true);86}87function findDNSSECHeader(buf) {88 // private case first89 if (buf.length <= DNSSEC_PRIVKEY_HEADER_PREFIX.length)90 return (false);91 var headerCheck = buf.slice(0, DNSSEC_PRIVKEY_HEADER_PREFIX.length);92 if (headerCheck.toString('ascii') === DNSSEC_PRIVKEY_HEADER_PREFIX)93 return (true);94 // public-key RFC3110 ?95 // 'domain.com. IN KEY ...' or 'domain.com. IN DNSKEY ...'96 // skip any comment-lines97 if (typeof (buf) !== 'string') {98 buf = buf.toString('ascii');99 }100 var lines = buf.split('\n');101 var line = 0;102 /* JSSTYLED */103 while (lines[line].match(/^\;/))104 line++;105 if (lines[line].toString('ascii').match(/\. IN KEY /))106 return (true);107 if (lines[line].toString('ascii').match(/\. IN DNSKEY /))108 return (true);109 return (false);110}111function write(key, options) {112 throw (new Error('"auto" format cannot be used for writing'));...
Using AI Code Generation
1var buf = new Buffer(256);2buf.fill(0);3var len = buf.write("Simply Easy Learning");4console.log("Octets written : "+ len);5var buf = new Buffer(26);6for (var i = 0 ; i < 26 ; i++) {7 buf[i] = i + 97;8}9var buf = new Buffer('Simply Easy Learning');10var json = buf.toJSON(buf);11console.log(json);12var buffer1 = new Buffer('TutorialsPoint ');13var buffer2 = new Buffer('Simply Easy Learning');14var buffer3 = Buffer.concat([buffer1,buffer2]);15console.log("buffer3 content: " + buffer3.toString());16var buffer1 = new Buffer('ABC');17var buffer2 = new Buffer('ABCD');18var result = buffer1.compare(buffer2);19if(result < 0) {20 console.log(buffer1 +" comes before " + buffer2);21}else if(result == 0){22 console.log(buffer1 +" is same as " + buffer2);23}else {24 console.log(buffer1 +" comes after " + buffer2);25}26var buffer1 = new Buffer('ABC');27var buffer2 = buffer1.slice(0,2);28console.log("buffer2 content: " + buffer2.toString());29var buffer1 = new Buffer('TutorialsPoint');30var buffer2 = new Buffer(3);31buffer1.copy(buffer2);32console.log("buffer2 content: " + buffer2.toString());
Using AI Code Generation
1var buf = new Buffer(256);2buf.fill(0);3buf.write("hello world", 0);4buf.write("hello world", 0, "ascii");5buf.write("hello world", 0, "ascii", function (err, written, buffer) { });6buf.write("hello world", 0, "ascii", 0);7buf.write("hello world", 0, "ascii", 0, function (err, written, buffer) { });8buf.write("hello world", 0, 11);9buf.write("hello world", 0, 11, "ascii");10buf.write("hello world", 0, 11, "ascii", function (err, written, buffer) { });11buf.write("hello world", 0, 11, "ascii", 0);12buf.write("hello world", 0, 11, "ascii", 0, function (err, written, buffer) { });13buf.write("hello world", 0, 11, 0);14buf.write("hello world", 0, 11, 0, "ascii");15buf.write("hello world", 0, 11, 0, "ascii", function (err, written, buffer) { });16buf.write("hello world", 0, 11, 0, "ascii", 0);17buf.write("hello world", 0, 11, 0, "ascii", 0, function (err, written, buffer) { });18buf.write("hello world", 0, 11, 0, 11);19buf.write("hello world", 0, 11, 0, 11, "ascii");20buf.write("hello world", 0, 11, 0, 11, "ascii", function (err, written, buffer) { });21buf.write("hello world", 0, 11, 0, 11, "ascii", 0);22buf.write("hello world", 0, 11, 0, 11, "ascii", 0, function (err, written, buffer) { });23buf.write("hello world", 0, 11, 0, 11, 0);24buf.write("hello world", 0, 11, 0, 11, 0, "ascii");25buf.write("hello world", 0, 11, 0, 11,
Using AI Code Generation
1var wpt = require('webpagetest');2var fs = require('fs');3var api = new wpt('www.webpagetest.org');4var options = {location: 'Dulles:Chrome', runs: 1, video: 1};5var buf = new Buffer(1000000);6api.runTest(url, options, function(err, data) {7 if (err) return console.error(err);8 api.getVideo('video_' + data.data.testId + '.webm', buf, function(err, data) {9 if (err) return console.error(err);10 fs.writeFile('video.webm', buf, function(err) {11 if(err) {12 console.log(err);13 } else {14 console.log("The file was saved!");15 }16 });17 });18});
Using AI Code Generation
1var wpt = require('webpagetest');2var wpt = new WebPageTest('www.webpagetest.org', 'A.f1a8d7d0c4e4c7a4a1e8d1d2e2c4e4e4');3var options = {4};5wpt.runTest(url, options, function(err, data) {6 if (err) return console.log(err);7 console.log(data);8});9var wpt = require('webpagetest');10var wpt = new WebPageTest('www.webpagetest.org', 'A.f1a8d7d0c4e4c7a4a1e8d1d2e2c4e4e4');11var options = {12};13wpt.runTest(url, options, function(err, data) {14 if (err) return console.log(err);15 console.log(data);16});17var wpt = require('webpagetest');18var wpt = new WebPageTest('www.webpagetest.org', 'A.f1a8d7d0c4e4c7a4a1e8d1d2e2c4e4e4');19var options = {
Automation Testing Tutorials
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