1'use strict'; 2const common = require('../common'); 3const assert = require('assert'); 4 5const b = Buffer.from('abcdef'); 6const buf_a = Buffer.from('a'); 7const buf_bc = Buffer.from('bc'); 8const buf_f = Buffer.from('f'); 9const buf_z = Buffer.from('z'); 10const buf_empty = Buffer.from(''); 11 12const s = 'abcdef'; 13 14assert.strictEqual(b.indexOf('a'), 0); 15assert.strictEqual(b.indexOf('a', 1), -1); 16assert.strictEqual(b.indexOf('a', -1), -1); 17assert.strictEqual(b.indexOf('a', -4), -1); 18assert.strictEqual(b.indexOf('a', -b.length), 0); 19assert.strictEqual(b.indexOf('a', NaN), 0); 20assert.strictEqual(b.indexOf('a', -Infinity), 0); 21assert.strictEqual(b.indexOf('a', Infinity), -1); 22assert.strictEqual(b.indexOf('bc'), 1); 23assert.strictEqual(b.indexOf('bc', 2), -1); 24assert.strictEqual(b.indexOf('bc', -1), -1); 25assert.strictEqual(b.indexOf('bc', -3), -1); 26assert.strictEqual(b.indexOf('bc', -5), 1); 27assert.strictEqual(b.indexOf('bc', NaN), 1); 28assert.strictEqual(b.indexOf('bc', -Infinity), 1); 29assert.strictEqual(b.indexOf('bc', Infinity), -1); 30assert.strictEqual(b.indexOf('f'), b.length - 1); 31assert.strictEqual(b.indexOf('z'), -1); 32assert.strictEqual(b.indexOf(''), 0); 33assert.strictEqual(b.indexOf('', 1), 1); 34assert.strictEqual(b.indexOf('', b.length + 1), b.length); 35assert.strictEqual(b.indexOf('', Infinity), b.length); 36assert.strictEqual(b.indexOf(buf_a), 0); 37assert.strictEqual(b.indexOf(buf_a, 1), -1); 38assert.strictEqual(b.indexOf(buf_a, -1), -1); 39assert.strictEqual(b.indexOf(buf_a, -4), -1); 40assert.strictEqual(b.indexOf(buf_a, -b.length), 0); 41assert.strictEqual(b.indexOf(buf_a, NaN), 0); 42assert.strictEqual(b.indexOf(buf_a, -Infinity), 0); 43assert.strictEqual(b.indexOf(buf_a, Infinity), -1); 44assert.strictEqual(b.indexOf(buf_bc), 1); 45assert.strictEqual(b.indexOf(buf_bc, 2), -1); 46assert.strictEqual(b.indexOf(buf_bc, -1), -1); 47assert.strictEqual(b.indexOf(buf_bc, -3), -1); 48assert.strictEqual(b.indexOf(buf_bc, -5), 1); 49assert.strictEqual(b.indexOf(buf_bc, NaN), 1); 50assert.strictEqual(b.indexOf(buf_bc, -Infinity), 1); 51assert.strictEqual(b.indexOf(buf_bc, Infinity), -1); 52assert.strictEqual(b.indexOf(buf_f), b.length - 1); 53assert.strictEqual(b.indexOf(buf_z), -1); 54assert.strictEqual(b.indexOf(buf_empty), 0); 55assert.strictEqual(b.indexOf(buf_empty, 1), 1); 56assert.strictEqual(b.indexOf(buf_empty, b.length + 1), b.length); 57assert.strictEqual(b.indexOf(buf_empty, Infinity), b.length); 58assert.strictEqual(b.indexOf(0x61), 0); 59assert.strictEqual(b.indexOf(0x61, 1), -1); 60assert.strictEqual(b.indexOf(0x61, -1), -1); 61assert.strictEqual(b.indexOf(0x61, -4), -1); 62assert.strictEqual(b.indexOf(0x61, -b.length), 0); 63assert.strictEqual(b.indexOf(0x61, NaN), 0); 64assert.strictEqual(b.indexOf(0x61, -Infinity), 0); 65assert.strictEqual(b.indexOf(0x61, Infinity), -1); 66assert.strictEqual(b.indexOf(0x0), -1); 67 68// test offsets 69assert.strictEqual(b.indexOf('d', 2), 3); 70assert.strictEqual(b.indexOf('f', 5), 5); 71assert.strictEqual(b.indexOf('f', -1), 5); 72assert.strictEqual(b.indexOf('f', 6), -1); 73 74assert.strictEqual(b.indexOf(Buffer.from('d'), 2), 3); 75assert.strictEqual(b.indexOf(Buffer.from('f'), 5), 5); 76assert.strictEqual(b.indexOf(Buffer.from('f'), -1), 5); 77assert.strictEqual(b.indexOf(Buffer.from('f'), 6), -1); 78 79assert.strictEqual(Buffer.from('ff').indexOf(Buffer.from('f'), 1, 'ucs2'), -1); 80 81// Test invalid and uppercase encoding 82assert.strictEqual(b.indexOf('b', 'utf8'), 1); 83assert.strictEqual(b.indexOf('b', 'UTF8'), 1); 84assert.strictEqual(b.indexOf('62', 'HEX'), 1); 85assert.throws(() => b.indexOf('bad', 'enc'), /Unknown encoding: enc/); 86 87// test hex encoding 88assert.strictEqual( 89 Buffer.from(b.toString('hex'), 'hex') 90 .indexOf('64', 0, 'hex'), 91 3 92); 93assert.strictEqual( 94 Buffer.from(b.toString('hex'), 'hex') 95 .indexOf(Buffer.from('64', 'hex'), 0, 'hex'), 96 3 97); 98 99// Test base64 encoding 100assert.strictEqual( 101 Buffer.from(b.toString('base64'), 'base64') 102 .indexOf('ZA==', 0, 'base64'), 103 3 104); 105assert.strictEqual( 106 Buffer.from(b.toString('base64'), 'base64') 107 .indexOf(Buffer.from('ZA==', 'base64'), 0, 'base64'), 108 3 109); 110 111// Test base64url encoding 112assert.strictEqual( 113 Buffer.from(b.toString('base64url'), 'base64url') 114 .indexOf('ZA==', 0, 'base64url'), 115 3 116); 117 118// test ascii encoding 119assert.strictEqual( 120 Buffer.from(b.toString('ascii'), 'ascii') 121 .indexOf('d', 0, 'ascii'), 122 3 123); 124assert.strictEqual( 125 Buffer.from(b.toString('ascii'), 'ascii') 126 .indexOf(Buffer.from('d', 'ascii'), 0, 'ascii'), 127 3 128); 129 130// Test latin1 encoding 131assert.strictEqual( 132 Buffer.from(b.toString('latin1'), 'latin1') 133 .indexOf('d', 0, 'latin1'), 134 3 135); 136assert.strictEqual( 137 Buffer.from(b.toString('latin1'), 'latin1') 138 .indexOf(Buffer.from('d', 'latin1'), 0, 'latin1'), 139 3 140); 141assert.strictEqual( 142 Buffer.from('aa\u00e8aa', 'latin1') 143 .indexOf('\u00e8', 'latin1'), 144 2 145); 146assert.strictEqual( 147 Buffer.from('\u00e8', 'latin1') 148 .indexOf('\u00e8', 'latin1'), 149 0 150); 151assert.strictEqual( 152 Buffer.from('\u00e8', 'latin1') 153 .indexOf(Buffer.from('\u00e8', 'latin1'), 'latin1'), 154 0 155); 156 157// Test binary encoding 158assert.strictEqual( 159 Buffer.from(b.toString('binary'), 'binary') 160 .indexOf('d', 0, 'binary'), 161 3 162); 163assert.strictEqual( 164 Buffer.from(b.toString('binary'), 'binary') 165 .indexOf(Buffer.from('d', 'binary'), 0, 'binary'), 166 3 167); 168assert.strictEqual( 169 Buffer.from('aa\u00e8aa', 'binary') 170 .indexOf('\u00e8', 'binary'), 171 2 172); 173assert.strictEqual( 174 Buffer.from('\u00e8', 'binary') 175 .indexOf('\u00e8', 'binary'), 176 0 177); 178assert.strictEqual( 179 Buffer.from('\u00e8', 'binary') 180 .indexOf(Buffer.from('\u00e8', 'binary'), 'binary'), 181 0 182); 183 184 185// Test optional offset with passed encoding 186assert.strictEqual(Buffer.from('aaaa0').indexOf('30', 'hex'), 4); 187assert.strictEqual(Buffer.from('aaaa00a').indexOf('3030', 'hex'), 4); 188 189{ 190 // Test usc2 and utf16le encoding 191 ['ucs2', 'utf16le'].forEach((encoding) => { 192 const twoByteString = Buffer.from( 193 '\u039a\u0391\u03a3\u03a3\u0395', encoding); 194 195 assert.strictEqual(twoByteString.indexOf('\u0395', 4, encoding), 8); 196 assert.strictEqual(twoByteString.indexOf('\u03a3', -4, encoding), 6); 197 assert.strictEqual(twoByteString.indexOf('\u03a3', -6, encoding), 4); 198 assert.strictEqual(twoByteString.indexOf( 199 Buffer.from('\u03a3', encoding), -6, encoding), 4); 200 assert.strictEqual(-1, twoByteString.indexOf('\u03a3', -2, encoding)); 201 }); 202} 203 204const mixedByteStringUcs2 = 205 Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395', 'ucs2'); 206assert.strictEqual(mixedByteStringUcs2.indexOf('bc', 0, 'ucs2'), 6); 207assert.strictEqual(mixedByteStringUcs2.indexOf('\u03a3', 0, 'ucs2'), 10); 208assert.strictEqual(-1, mixedByteStringUcs2.indexOf('\u0396', 0, 'ucs2')); 209 210assert.strictEqual( 211 mixedByteStringUcs2.indexOf(Buffer.from('bc', 'ucs2'), 0, 'ucs2'), 6); 212assert.strictEqual( 213 mixedByteStringUcs2.indexOf(Buffer.from('\u03a3', 'ucs2'), 0, 'ucs2'), 10); 214assert.strictEqual( 215 -1, mixedByteStringUcs2.indexOf(Buffer.from('\u0396', 'ucs2'), 0, 'ucs2')); 216 217{ 218 const twoByteString = Buffer.from('\u039a\u0391\u03a3\u03a3\u0395', 'ucs2'); 219 220 // Test single char pattern 221 assert.strictEqual(twoByteString.indexOf('\u039a', 0, 'ucs2'), 0); 222 let index = twoByteString.indexOf('\u0391', 0, 'ucs2'); 223 assert.strictEqual(index, 2, `Alpha - at index ${index}`); 224 index = twoByteString.indexOf('\u03a3', 0, 'ucs2'); 225 assert.strictEqual(index, 4, `First Sigma - at index ${index}`); 226 index = twoByteString.indexOf('\u03a3', 6, 'ucs2'); 227 assert.strictEqual(index, 6, `Second Sigma - at index ${index}`); 228 index = twoByteString.indexOf('\u0395', 0, 'ucs2'); 229 assert.strictEqual(index, 8, `Epsilon - at index ${index}`); 230 index = twoByteString.indexOf('\u0392', 0, 'ucs2'); 231 assert.strictEqual(-1, index, `Not beta - at index ${index}`); 232 233 // Test multi-char pattern 234 index = twoByteString.indexOf('\u039a\u0391', 0, 'ucs2'); 235 assert.strictEqual(index, 0, `Lambda Alpha - at index ${index}`); 236 index = twoByteString.indexOf('\u0391\u03a3', 0, 'ucs2'); 237 assert.strictEqual(index, 2, `Alpha Sigma - at index ${index}`); 238 index = twoByteString.indexOf('\u03a3\u03a3', 0, 'ucs2'); 239 assert.strictEqual(index, 4, `Sigma Sigma - at index ${index}`); 240 index = twoByteString.indexOf('\u03a3\u0395', 0, 'ucs2'); 241 assert.strictEqual(index, 6, `Sigma Epsilon - at index ${index}`); 242} 243 244const mixedByteStringUtf8 = Buffer.from('\u039a\u0391abc\u03a3\u03a3\u0395'); 245assert.strictEqual(mixedByteStringUtf8.indexOf('bc'), 5); 246assert.strictEqual(mixedByteStringUtf8.indexOf('bc', 5), 5); 247assert.strictEqual(mixedByteStringUtf8.indexOf('bc', -8), 5); 248assert.strictEqual(mixedByteStringUtf8.indexOf('\u03a3'), 7); 249assert.strictEqual(mixedByteStringUtf8.indexOf('\u0396'), -1); 250 251 252// Test complex string indexOf algorithms. Only trigger for long strings. 253// Long string that isn't a simple repeat of a shorter string. 254let longString = 'A'; 255for (let i = 66; i < 76; i++) { // from 'B' to 'K' 256 longString = longString + String.fromCharCode(i) + longString; 257} 258 259const longBufferString = Buffer.from(longString); 260 261// Pattern of 15 chars, repeated every 16 chars in long 262let pattern = 'ABACABADABACABA'; 263for (let i = 0; i < longBufferString.length - pattern.length; i += 7) { 264 const index = longBufferString.indexOf(pattern, i); 265 assert.strictEqual((i + 15) & ~0xf, index, 266 `Long ABACABA...-string at index ${i}`); 267} 268 269let index = longBufferString.indexOf('AJABACA'); 270assert.strictEqual(index, 510, `Long AJABACA, First J - at index ${index}`); 271index = longBufferString.indexOf('AJABACA', 511); 272assert.strictEqual(index, 1534, `Long AJABACA, Second J - at index ${index}`); 273 274pattern = 'JABACABADABACABA'; 275index = longBufferString.indexOf(pattern); 276assert.strictEqual(index, 511, `Long JABACABA..., First J - at index ${index}`); 277index = longBufferString.indexOf(pattern, 512); 278assert.strictEqual( 279 index, 1535, `Long JABACABA..., Second J - at index ${index}`); 280 281// Search for a non-ASCII string in a pure ASCII string. 282const asciiString = Buffer.from( 283 'arglebargleglopglyfarglebargleglopglyfarglebargleglopglyf'); 284assert.strictEqual(-1, asciiString.indexOf('\x2061')); 285assert.strictEqual(asciiString.indexOf('leb', 0), 3); 286 287// Search in string containing many non-ASCII chars. 288const allCodePoints = []; 289for (let i = 0; i < 65534; i++) allCodePoints[i] = i; 290const allCharsString = String.fromCharCode.apply(String, allCodePoints) + 291 String.fromCharCode(65534, 65535); 292const allCharsBufferUtf8 = Buffer.from(allCharsString); 293const allCharsBufferUcs2 = Buffer.from(allCharsString, 'ucs2'); 294 295// Search for string long enough to trigger complex search with ASCII pattern 296// and UC16 subject. 297assert.strictEqual(-1, allCharsBufferUtf8.indexOf('notfound')); 298assert.strictEqual(-1, allCharsBufferUcs2.indexOf('notfound')); 299 300// Needle is longer than haystack, but only because it's encoded as UTF-16 301assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'ucs2'), -1); 302 303assert.strictEqual(Buffer.from('aaaa').indexOf('a'.repeat(4), 'utf8'), 0); 304assert.strictEqual(Buffer.from('aaaa').indexOf('你好', 'ucs2'), -1); 305 306// Haystack has odd length, but the needle is UCS2. 307assert.strictEqual(Buffer.from('aaaaa').indexOf('b', 'ucs2'), -1); 308 309{ 310 // Find substrings in Utf8. 311 const lengths = [1, 3, 15]; // Single char, simple and complex. 312 const indices = [0x5, 0x60, 0x400, 0x680, 0x7ee, 0xFF02, 0x16610, 0x2f77b]; 313 for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) { 314 for (let i = 0; i < indices.length; i++) { 315 const index = indices[i]; 316 let length = lengths[lengthIndex]; 317 318 if (index + length > 0x7F) { 319 length = 2 * length; 320 } 321 322 if (index + length > 0x7FF) { 323 length = 3 * length; 324 } 325 326 if (index + length > 0xFFFF) { 327 length = 4 * length; 328 } 329 330 const patternBufferUtf8 = allCharsBufferUtf8.slice(index, index + length); 331 assert.strictEqual(index, allCharsBufferUtf8.indexOf(patternBufferUtf8)); 332 333 const patternStringUtf8 = patternBufferUtf8.toString(); 334 assert.strictEqual(index, allCharsBufferUtf8.indexOf(patternStringUtf8)); 335 } 336 } 337} 338 339{ 340 // Find substrings in Usc2. 341 const lengths = [2, 4, 16]; // Single char, simple and complex. 342 const indices = [0x5, 0x65, 0x105, 0x205, 0x285, 0x2005, 0x2085, 0xfff0]; 343 for (let lengthIndex = 0; lengthIndex < lengths.length; lengthIndex++) { 344 for (let i = 0; i < indices.length; i++) { 345 const index = indices[i] * 2; 346 const length = lengths[lengthIndex]; 347 348 const patternBufferUcs2 = 349 allCharsBufferUcs2.slice(index, index + length); 350 assert.strictEqual( 351 index, allCharsBufferUcs2.indexOf(patternBufferUcs2, 0, 'ucs2')); 352 353 const patternStringUcs2 = patternBufferUcs2.toString('ucs2'); 354 assert.strictEqual( 355 index, allCharsBufferUcs2.indexOf(patternStringUcs2, 0, 'ucs2')); 356 } 357 } 358} 359 360[ 361 () => {}, 362 {}, 363 [], 364].forEach((val) => { 365 assert.throws( 366 () => b.indexOf(val), 367 { 368 code: 'ERR_INVALID_ARG_TYPE', 369 name: 'TypeError', 370 message: 'The "value" argument must be one of type number or string ' + 371 'or an instance of Buffer or Uint8Array.' + 372 common.invalidArgTypeHelper(val) 373 } 374 ); 375}); 376 377// Test weird offset arguments. 378// The following offsets coerce to NaN or 0, searching the whole Buffer 379assert.strictEqual(b.indexOf('b', undefined), 1); 380assert.strictEqual(b.indexOf('b', {}), 1); 381assert.strictEqual(b.indexOf('b', 0), 1); 382assert.strictEqual(b.indexOf('b', null), 1); 383assert.strictEqual(b.indexOf('b', []), 1); 384 385// The following offset coerces to 2, in other words +[2] === 2 386assert.strictEqual(b.indexOf('b', [2]), -1); 387 388// Behavior should match String.indexOf() 389assert.strictEqual( 390 b.indexOf('b', undefined), 391 s.indexOf('b', undefined)); 392assert.strictEqual( 393 b.indexOf('b', {}), 394 s.indexOf('b', {})); 395assert.strictEqual( 396 b.indexOf('b', 0), 397 s.indexOf('b', 0)); 398assert.strictEqual( 399 b.indexOf('b', null), 400 s.indexOf('b', null)); 401assert.strictEqual( 402 b.indexOf('b', []), 403 s.indexOf('b', [])); 404assert.strictEqual( 405 b.indexOf('b', [2]), 406 s.indexOf('b', [2])); 407 408// All code for handling encodings is shared between Buffer.indexOf and 409// Buffer.lastIndexOf, so only testing the separate lastIndexOf semantics. 410 411// Test lastIndexOf basic functionality; Buffer b contains 'abcdef'. 412// lastIndexOf string: 413assert.strictEqual(b.lastIndexOf('a'), 0); 414assert.strictEqual(b.lastIndexOf('a', 1), 0); 415assert.strictEqual(b.lastIndexOf('b', 1), 1); 416assert.strictEqual(b.lastIndexOf('c', 1), -1); 417assert.strictEqual(b.lastIndexOf('a', -1), 0); 418assert.strictEqual(b.lastIndexOf('a', -4), 0); 419assert.strictEqual(b.lastIndexOf('a', -b.length), 0); 420assert.strictEqual(b.lastIndexOf('a', -b.length - 1), -1); 421assert.strictEqual(b.lastIndexOf('a', NaN), 0); 422assert.strictEqual(b.lastIndexOf('a', -Infinity), -1); 423assert.strictEqual(b.lastIndexOf('a', Infinity), 0); 424// lastIndexOf Buffer: 425assert.strictEqual(b.lastIndexOf(buf_a), 0); 426assert.strictEqual(b.lastIndexOf(buf_a, 1), 0); 427assert.strictEqual(b.lastIndexOf(buf_a, -1), 0); 428assert.strictEqual(b.lastIndexOf(buf_a, -4), 0); 429assert.strictEqual(b.lastIndexOf(buf_a, -b.length), 0); 430assert.strictEqual(b.lastIndexOf(buf_a, -b.length - 1), -1); 431assert.strictEqual(b.lastIndexOf(buf_a, NaN), 0); 432assert.strictEqual(b.lastIndexOf(buf_a, -Infinity), -1); 433assert.strictEqual(b.lastIndexOf(buf_a, Infinity), 0); 434assert.strictEqual(b.lastIndexOf(buf_bc), 1); 435assert.strictEqual(b.lastIndexOf(buf_bc, 2), 1); 436assert.strictEqual(b.lastIndexOf(buf_bc, -1), 1); 437assert.strictEqual(b.lastIndexOf(buf_bc, -3), 1); 438assert.strictEqual(b.lastIndexOf(buf_bc, -5), 1); 439assert.strictEqual(b.lastIndexOf(buf_bc, -6), -1); 440assert.strictEqual(b.lastIndexOf(buf_bc, NaN), 1); 441assert.strictEqual(b.lastIndexOf(buf_bc, -Infinity), -1); 442assert.strictEqual(b.lastIndexOf(buf_bc, Infinity), 1); 443assert.strictEqual(b.lastIndexOf(buf_f), b.length - 1); 444assert.strictEqual(b.lastIndexOf(buf_z), -1); 445assert.strictEqual(b.lastIndexOf(buf_empty), b.length); 446assert.strictEqual(b.lastIndexOf(buf_empty, 1), 1); 447assert.strictEqual(b.lastIndexOf(buf_empty, b.length + 1), b.length); 448assert.strictEqual(b.lastIndexOf(buf_empty, Infinity), b.length); 449// lastIndexOf number: 450assert.strictEqual(b.lastIndexOf(0x61), 0); 451assert.strictEqual(b.lastIndexOf(0x61, 1), 0); 452assert.strictEqual(b.lastIndexOf(0x61, -1), 0); 453assert.strictEqual(b.lastIndexOf(0x61, -4), 0); 454assert.strictEqual(b.lastIndexOf(0x61, -b.length), 0); 455assert.strictEqual(b.lastIndexOf(0x61, -b.length - 1), -1); 456assert.strictEqual(b.lastIndexOf(0x61, NaN), 0); 457assert.strictEqual(b.lastIndexOf(0x61, -Infinity), -1); 458assert.strictEqual(b.lastIndexOf(0x61, Infinity), 0); 459assert.strictEqual(b.lastIndexOf(0x0), -1); 460 461// Test weird offset arguments. 462// The following offsets coerce to NaN, searching the whole Buffer 463assert.strictEqual(b.lastIndexOf('b', undefined), 1); 464assert.strictEqual(b.lastIndexOf('b', {}), 1); 465 466// The following offsets coerce to 0 467assert.strictEqual(b.lastIndexOf('b', 0), -1); 468assert.strictEqual(b.lastIndexOf('b', null), -1); 469assert.strictEqual(b.lastIndexOf('b', []), -1); 470 471// The following offset coerces to 2, in other words +[2] === 2 472assert.strictEqual(b.lastIndexOf('b', [2]), 1); 473 474// Behavior should match String.lastIndexOf() 475assert.strictEqual( 476 b.lastIndexOf('b', undefined), 477 s.lastIndexOf('b', undefined)); 478assert.strictEqual( 479 b.lastIndexOf('b', {}), 480 s.lastIndexOf('b', {})); 481assert.strictEqual( 482 b.lastIndexOf('b', 0), 483 s.lastIndexOf('b', 0)); 484assert.strictEqual( 485 b.lastIndexOf('b', null), 486 s.lastIndexOf('b', null)); 487assert.strictEqual( 488 b.lastIndexOf('b', []), 489 s.lastIndexOf('b', [])); 490assert.strictEqual( 491 b.lastIndexOf('b', [2]), 492 s.lastIndexOf('b', [2])); 493 494// Test needles longer than the haystack. 495assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'ucs2'), -1); 496assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'utf8'), -1); 497assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'latin1'), -1); 498assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 'binary'), -1); 499assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa')), -1); 500assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 2, 'ucs2'), -1); 501assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 3, 'utf8'), -1); 502assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'latin1'), -1); 503assert.strictEqual(b.lastIndexOf('aaaaaaaaaaaaaaa', 5, 'binary'), -1); 504assert.strictEqual(b.lastIndexOf(Buffer.from('aaaaaaaaaaaaaaa'), 7), -1); 505 506// 你好 expands to a total of 6 bytes using UTF-8 and 4 bytes using UTF-16 507assert.strictEqual(buf_bc.lastIndexOf('你好', 'ucs2'), -1); 508assert.strictEqual(buf_bc.lastIndexOf('你好', 'utf8'), -1); 509assert.strictEqual(buf_bc.lastIndexOf('你好', 'latin1'), -1); 510assert.strictEqual(buf_bc.lastIndexOf('你好', 'binary'), -1); 511assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好')), -1); 512assert.strictEqual(buf_bc.lastIndexOf('你好', 2, 'ucs2'), -1); 513assert.strictEqual(buf_bc.lastIndexOf('你好', 3, 'utf8'), -1); 514assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'latin1'), -1); 515assert.strictEqual(buf_bc.lastIndexOf('你好', 5, 'binary'), -1); 516assert.strictEqual(buf_bc.lastIndexOf(Buffer.from('你好'), 7), -1); 517 518// Test lastIndexOf on a longer buffer: 519const bufferString = Buffer.from('a man a plan a canal panama'); 520assert.strictEqual(bufferString.lastIndexOf('canal'), 15); 521assert.strictEqual(bufferString.lastIndexOf('panama'), 21); 522assert.strictEqual(bufferString.lastIndexOf('a man a plan a canal panama'), 0); 523assert.strictEqual(-1, bufferString.lastIndexOf('a man a plan a canal mexico')); 524assert.strictEqual(-1, bufferString 525 .lastIndexOf('a man a plan a canal mexico city')); 526assert.strictEqual(-1, bufferString.lastIndexOf(Buffer.from('a'.repeat(1000)))); 527assert.strictEqual(bufferString.lastIndexOf('a man a plan', 4), 0); 528assert.strictEqual(bufferString.lastIndexOf('a '), 13); 529assert.strictEqual(bufferString.lastIndexOf('a ', 13), 13); 530assert.strictEqual(bufferString.lastIndexOf('a ', 12), 6); 531assert.strictEqual(bufferString.lastIndexOf('a ', 5), 0); 532assert.strictEqual(bufferString.lastIndexOf('a ', -1), 13); 533assert.strictEqual(bufferString.lastIndexOf('a ', -27), 0); 534assert.strictEqual(-1, bufferString.lastIndexOf('a ', -28)); 535 536// Test lastIndexOf for the case that the first character can be found, 537// but in a part of the buffer that does not make search to search 538// due do length constraints. 539const abInUCS2 = Buffer.from('ab', 'ucs2'); 540assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'latin1').lastIndexOf('µ')); 541assert.strictEqual(-1, Buffer.from('µaaaa¶bbbb', 'binary').lastIndexOf('µ')); 542assert.strictEqual(-1, Buffer.from('bc').lastIndexOf('ab')); 543assert.strictEqual(-1, Buffer.from('abc').lastIndexOf('qa')); 544assert.strictEqual(-1, Buffer.from('abcdef').lastIndexOf('qabc')); 545assert.strictEqual(-1, Buffer.from('bc').lastIndexOf(Buffer.from('ab'))); 546assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf('ab', 'ucs2')); 547assert.strictEqual(-1, Buffer.from('bc', 'ucs2').lastIndexOf(abInUCS2)); 548 549assert.strictEqual(Buffer.from('abc').lastIndexOf('ab'), 0); 550assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 1), 0); 551assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 2), 0); 552assert.strictEqual(Buffer.from('abc').lastIndexOf('ab', 3), 0); 553 554// The above tests test the LINEAR and SINGLE-CHAR strategies. 555// Now, we test the BOYER-MOORE-HORSPOOL strategy. 556// Test lastIndexOf on a long buffer w multiple matches: 557pattern = 'JABACABADABACABA'; 558assert.strictEqual(longBufferString.lastIndexOf(pattern), 1535); 559assert.strictEqual(longBufferString.lastIndexOf(pattern, 1535), 1535); 560assert.strictEqual(longBufferString.lastIndexOf(pattern, 1534), 511); 561 562// Finally, give it a really long input to trigger fallback from BMH to 563// regular BOYER-MOORE (which has better worst-case complexity). 564 565// Generate a really long Thue-Morse sequence of 'yolo' and 'swag', 566// "yolo swag swag yolo swag yolo yolo swag" ..., goes on for about 5MB. 567// This is hard to search because it all looks similar, but never repeats. 568 569// countBits returns the number of bits in the binary representation of n. 570function countBits(n) { 571 let count; 572 for (count = 0; n > 0; count++) { 573 n = n & (n - 1); // remove top bit 574 } 575 return count; 576} 577const parts = []; 578for (let i = 0; i < 1000000; i++) { 579 parts.push((countBits(i) % 2 === 0) ? 'yolo' : 'swag'); 580} 581const reallyLong = Buffer.from(parts.join(' ')); 582assert.strictEqual(reallyLong.slice(0, 19).toString(), 'yolo swag swag yolo'); 583 584// Expensive reverse searches. Stress test lastIndexOf: 585pattern = reallyLong.slice(0, 100000); // First 1/50th of the pattern. 586assert.strictEqual(reallyLong.lastIndexOf(pattern), 4751360); 587assert.strictEqual(reallyLong.lastIndexOf(pattern, 4000000), 3932160); 588assert.strictEqual(reallyLong.lastIndexOf(pattern, 3000000), 2949120); 589pattern = reallyLong.slice(100000, 200000); // Second 1/50th. 590assert.strictEqual(reallyLong.lastIndexOf(pattern), 4728480); 591pattern = reallyLong.slice(0, 1000000); // First 1/5th. 592assert.strictEqual(reallyLong.lastIndexOf(pattern), 3932160); 593pattern = reallyLong.slice(0, 2000000); // first 2/5ths. 594assert.strictEqual(reallyLong.lastIndexOf(pattern), 0); 595 596// Test truncation of Number arguments to uint8 597{ 598 const buf = Buffer.from('this is a test'); 599 assert.strictEqual(buf.indexOf(0x6973), 3); 600 assert.strictEqual(buf.indexOf(0x697320), 4); 601 assert.strictEqual(buf.indexOf(0x69732069), 2); 602 assert.strictEqual(buf.indexOf(0x697374657374), 0); 603 assert.strictEqual(buf.indexOf(0x69737374), 0); 604 assert.strictEqual(buf.indexOf(0x69737465), 11); 605 assert.strictEqual(buf.indexOf(0x69737465), 11); 606 assert.strictEqual(buf.indexOf(-140), 0); 607 assert.strictEqual(buf.indexOf(-152), 1); 608 assert.strictEqual(buf.indexOf(0xff), -1); 609 assert.strictEqual(buf.indexOf(0xffff), -1); 610} 611 612// Test that Uint8Array arguments are okay. 613{ 614 const needle = new Uint8Array([ 0x66, 0x6f, 0x6f ]); 615 const haystack = Buffer.from('a foo b foo'); 616 assert.strictEqual(haystack.indexOf(needle), 2); 617 assert.strictEqual(haystack.lastIndexOf(needle), haystack.length - 3); 618} 619 620// Avoid abort because of invalid usage 621// see https://github.com/nodejs/node/issues/32753 622{ 623 assert.throws(() => { 624 const buffer = require('buffer'); 625 new buffer.Buffer.prototype.lastIndexOf(1, 'str'); 626 }, { 627 code: 'ERR_INVALID_ARG_TYPE', 628 name: 'TypeError', 629 message: 'The "buffer" argument must be an instance of Buffer, ' + 630 'TypedArray, or DataView. ' + 631 'Received an instance of lastIndexOf' 632 }); 633} 634