first commit

Author: reklatsmasters

.editorconfig

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+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true

.eslintignore

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+coverage
+/node_modules

.gitattributes

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+* text=auto
+*.js text eol=lf

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+/node_modules
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+
+# IDEs
+.idea
+.DS_Store
+.vscode
+*sublime*
+
+# perf
+
+perf.data*
+.jest-cache

.npmignore

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+test
+testing
+coverage

.travis.yml

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+sudo: false
+language: node_js
+node_js:
+  - "10"
+  - "8"
+  - "6"
+
+script: npm run test-ci
+before_install:
+- npm install -g npm@6
+- npm install -g --production coveralls
+after_script:
+- cat ./coverage/lcov.info | coveralls

LICENSE

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+MIT License
+
+Copyright (c) 2018 Dmitriy Tsvettsikh
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

benchmark/crc32.js

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+'use strict';
+
+const crc = require('crc/lib/crc32');
+const crc32 = require('../crc32');
+
+const testbuf = Buffer.allocUnsafe(1024 * 4);
+
+console.time('crc');
+for (let i = 0; i < 1e5; ++i) {
+  crc(testbuf);
+}
+console.timeEnd('crc');
+
+console.time('turbo-crc32');
+for (let i = 0; i < 1e5; ++i) {
+  crc32(testbuf);
+}
+console.timeEnd('turbo-crc32');

crc32.js

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+'use strict';
+
+const { createSlicedTable } = require('./src/create-table');
+const crc32By8 = require('./src/crc32-by-8');
+
+const CRC32_LOOKUP = createSlicedTable(0xedb88320);
+
+module.exports = crc32;
+
+/**
+ * Compute CRC32 using slicing-by-n algorithm.
+ * @param {Buffer|string} source
+ * @returns {number}
+ */
+function crc32(source) {
+  const buf = Buffer.isBuffer(source) ? source : Buffer.from(source);
+
+  return (crc32By8(CRC32_LOOKUP, buf, 0xffffffff, 0) ^ 0xffffffff) >>> 0;
+}

crc32c.js

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+'use strict';
+
+const { createSlicedTable } = require('./src/create-table');
+const crc32By8 = require('./src/crc32-by-8');
+
+const CRC32C_LOOKUP = createSlicedTable(0x82f63b78);
+
+module.exports = crc32c;
+
+/**
+ * Compute CRC32C using slicing-by-n algorithm.
+ * @param {Buffer|string} source
+ * @returns {number}
+ */
+function crc32c(source) {
+  const buf = Buffer.isBuffer(source) ? source : Buffer.from(source);
+
+  return (crc32By8(CRC32C_LOOKUP, buf, 0xffffffff, 0) ^ 0xffffffff) >>> 0;
+}