|
| 1 | +'use strict'; |
| 2 | + |
| 3 | +require('../common'); |
| 4 | +const zlib = require('zlib'); |
| 5 | +const assert = require('assert'); |
| 6 | +const { Buffer } = require('buffer'); |
| 7 | + |
| 8 | +// Test vectors from RFC 3720, Appendix B.4. |
| 9 | +{ |
| 10 | + const ascending = Buffer.alloc(32); |
| 11 | + const descending = Buffer.alloc(32); |
| 12 | + for (let i = 0; i < 32; i++) { |
| 13 | + ascending[i] = i; |
| 14 | + descending[i] = 31 - i; |
| 15 | + } |
| 16 | + const iscsiReadPdu = Buffer.from( |
| 17 | + '01c00000000000000000000000000000' + |
| 18 | + '14000000000004000000001400000018' + |
| 19 | + '28000000000000000200000000000000', 'hex'); |
| 20 | + |
| 21 | + const tests = [ |
| 22 | + [Buffer.alloc(32, 0x00), 0x8a9136aa], |
| 23 | + [Buffer.alloc(32, 0xff), 0x62a8ab43], |
| 24 | + [ascending, 0x46dd794e], |
| 25 | + [descending, 0x113fdb5c], |
| 26 | + [iscsiReadPdu, 0xd9963a56], |
| 27 | + ]; |
| 28 | + for (const [data, expected] of tests) { |
| 29 | + assert.strictEqual(zlib.crc32c(data), expected); |
| 30 | + assert.strictEqual(zlib.crc32c(data, 0), expected); |
| 31 | + } |
| 32 | +} |
| 33 | + |
| 34 | +assert.strictEqual(zlib.crc32c('123456789'), 0xe3069283); |
| 35 | +assert.strictEqual(zlib.crc32c(Buffer.from('123456789')), 0xe3069283); |
| 36 | + |
| 37 | +assert.strictEqual(zlib.crc32c(''), 0); |
| 38 | +assert.strictEqual(zlib.crc32c(Buffer.alloc(0)), 0); |
| 39 | +assert.strictEqual(zlib.crc32c('', 0xffffffff), 0xffffffff); |
| 40 | +assert.strictEqual(zlib.crc32c(Buffer.alloc(0), 0x12345678), 0x12345678); |
| 41 | +assert.strictEqual(zlib.crc32c('123456789', -0), 0xe3069283); |
| 42 | + |
| 43 | +// Strings are encoded as UTF-8. |
| 44 | +{ |
| 45 | + const str = 'héllo wörld ✓ 🚀'; |
| 46 | + assert.strictEqual(zlib.crc32c(str), zlib.crc32c(Buffer.from(str, 'utf8'))); |
| 47 | +} |
| 48 | + |
| 49 | +// Only the bytes covered by the view are used. |
| 50 | +{ |
| 51 | + const backing = Buffer.from('xx123456789yy'); |
| 52 | + const view = backing.subarray(2, 11); |
| 53 | + assert.strictEqual(zlib.crc32c(view), 0xe3069283); |
| 54 | + assert.strictEqual( |
| 55 | + zlib.crc32c(new Uint8Array(backing.buffer, backing.byteOffset + 2, 9)), |
| 56 | + 0xe3069283); |
| 57 | + assert.strictEqual( |
| 58 | + zlib.crc32c(new DataView(backing.buffer, backing.byteOffset + 2, 9)), |
| 59 | + 0xe3069283); |
| 60 | +} |
| 61 | + |
| 62 | +// Chaining with `value` matches a single pass, across sizes and split points |
| 63 | +// large enough to reach every code path of the implementation. |
| 64 | +{ |
| 65 | + const data = Buffer.allocUnsafe(1 << 20); |
| 66 | + for (let i = 0; i < data.length; i++) data[i] = (i * 1103515245 + 12345) & 0xff; |
| 67 | + for (const len of [1, 7, 15, 16, 17, 63, 64, 65, 255, 256, 4095, 4096, |
| 68 | + 65537, data.length]) { |
| 69 | + const chunk = data.subarray(0, len); |
| 70 | + const whole = zlib.crc32c(chunk); |
| 71 | + for (const split of new Set([0, 1, len >> 1, len - 1, len])) { |
| 72 | + const crc = zlib.crc32c(chunk.subarray(split), |
| 73 | + zlib.crc32c(chunk.subarray(0, split))); |
| 74 | + assert.strictEqual(crc, whole, `len=${len} split=${split}`); |
| 75 | + } |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +// Different from CRC-32. |
| 80 | +assert.notStrictEqual(zlib.crc32c('123456789'), zlib.crc32('123456789')); |
| 81 | + |
| 82 | +[undefined, null, true, 1, () => {}, {}].forEach((invalid) => { |
| 83 | + assert.throws(() => { zlib.crc32c(invalid); }, { code: 'ERR_INVALID_ARG_TYPE' }); |
| 84 | +}); |
| 85 | + |
| 86 | +[null, true, () => {}, {}].forEach((invalid) => { |
| 87 | + assert.throws(() => { zlib.crc32c('test', invalid); }, { code: 'ERR_INVALID_ARG_TYPE' }); |
| 88 | +}); |
| 89 | + |
| 90 | +[-1, 2 ** 32, 1.5, NaN].forEach((invalid) => { |
| 91 | + assert.throws(() => { zlib.crc32c('test', invalid); }, { code: 'ERR_OUT_OF_RANGE' }); |
| 92 | +}); |
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