pax_global_header00006660000000000000000000000064135312645260014521gustar00rootroot0000000000000052 comment=19a456b548b26bac6b54ec682bc1b59fd1ff53be node-ieee754-1.1.13/000077500000000000000000000000001353126452600136765ustar00rootroot00000000000000node-ieee754-1.1.13/.airtap.yml000066400000000000000000000004461353126452600157630ustar00rootroot00000000000000loopback: airtap.local scripts: - "./test/_polyfill.js" browsers: - name: chrome version: latest - name: firefox version: latest - name: safari version: latest - name: ie version: latest - name: microsoftedge version: latest - name: iphone version: latest node-ieee754-1.1.13/.npmignore000066400000000000000000000000361353126452600156740ustar00rootroot00000000000000.airtap.yml .travis.yml test/ node-ieee754-1.1.13/.travis.yml000066400000000000000000000007401353126452600160100ustar00rootroot00000000000000language: node_js node_js: - lts/* addons: sauce_connect: true hosts: - airtap.local env: global: - secure: f3NrmOV/A7oACn47J1mkIpH8Sn/LINtluZvo/9pGo3Ss4+D2lyt7UawpedHtnYgU9WEyjPSi7pDWopUrIzusQ2trLYRJr8WAOEyHlgaepDyy4BW3ghGMKHMsS05kilYLP8nu1sRd6y1AcUYKw+kUrrSPanI7kViWVQ5d5DuwXO8= - secure: a6teILh33z5fbGQbh5/EkFfAyXfa2fPJG1upy9K+jLAbG4WZxXD+YmXG9Tz33/2NJm6UplGfTJ8IQEXgxEfAFk3ao3xfKxzm3i64XxtroSlXIFNSiQKogxDfLEtWDoNNCodPHaV3ATEqxGJ5rkkUeU1+ROWW0sjG5JR26k8/Hfg= node-ieee754-1.1.13/LICENSE000066400000000000000000000026711353126452600147110ustar00rootroot00000000000000Copyright 2008 Fair Oaks Labs, Inc. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. node-ieee754-1.1.13/README.md000066400000000000000000000034351353126452600151620ustar00rootroot00000000000000# ieee754 [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][downloads-url] [![javascript style guide][standard-image]][standard-url] [travis-image]: https://img.shields.io/travis/feross/ieee754/master.svg [travis-url]: https://travis-ci.org/feross/ieee754 [npm-image]: https://img.shields.io/npm/v/ieee754.svg [npm-url]: https://npmjs.org/package/ieee754 [downloads-image]: https://img.shields.io/npm/dm/ieee754.svg [downloads-url]: https://npmjs.org/package/ieee754 [standard-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg [standard-url]: https://standardjs.com [![saucelabs][saucelabs-image]][saucelabs-url] [saucelabs-image]: https://saucelabs.com/browser-matrix/ieee754.svg [saucelabs-url]: https://saucelabs.com/u/ieee754 ### Read/write IEEE754 floating point numbers from/to a Buffer or array-like object. ## install ``` npm install ieee754 ``` [Get supported ieee754 with the Tidelift Subscription](https://tidelift.com/subscription/pkg/npm-ieee754?utm_source=npm-ieee754&utm_medium=referral&utm_campaign=readme) ## methods `var ieee754 = require('ieee754')` The `ieee754` object has the following functions: ``` ieee754.read = function (buffer, offset, isLE, mLen, nBytes) ieee754.write = function (buffer, value, offset, isLE, mLen, nBytes) ``` The arguments mean the following: - buffer = the buffer - offset = offset into the buffer - value = value to set (only for `write`) - isLe = is little endian? - mLen = mantissa length - nBytes = number of bytes ## what is ieee754? The IEEE Standard for Floating-Point Arithmetic (IEEE 754) is a technical standard for floating-point computation. [Read more](http://en.wikipedia.org/wiki/IEEE_floating_point). ## license BSD 3 Clause. Copyright (c) 2008, Fair Oaks Labs, Inc. node-ieee754-1.1.13/index.js000066400000000000000000000040201353126452600153370ustar00rootroot00000000000000exports.read = function (buffer, offset, isLE, mLen, nBytes) { var e, m var eLen = (nBytes * 8) - mLen - 1 var eMax = (1 << eLen) - 1 var eBias = eMax >> 1 var nBits = -7 var i = isLE ? (nBytes - 1) : 0 var d = isLE ? -1 : 1 var s = buffer[offset + i] i += d e = s & ((1 << (-nBits)) - 1) s >>= (-nBits) nBits += eLen for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {} m = e & ((1 << (-nBits)) - 1) e >>= (-nBits) nBits += mLen for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {} if (e === 0) { e = 1 - eBias } else if (e === eMax) { return m ? NaN : ((s ? -1 : 1) * Infinity) } else { m = m + Math.pow(2, mLen) e = e - eBias } return (s ? -1 : 1) * m * Math.pow(2, e - mLen) } exports.write = function (buffer, value, offset, isLE, mLen, nBytes) { var e, m, c var eLen = (nBytes * 8) - mLen - 1 var eMax = (1 << eLen) - 1 var eBias = eMax >> 1 var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0) var i = isLE ? 0 : (nBytes - 1) var d = isLE ? 1 : -1 var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0 value = Math.abs(value) if (isNaN(value) || value === Infinity) { m = isNaN(value) ? 1 : 0 e = eMax } else { e = Math.floor(Math.log(value) / Math.LN2) if (value * (c = Math.pow(2, -e)) < 1) { e-- c *= 2 } if (e + eBias >= 1) { value += rt / c } else { value += rt * Math.pow(2, 1 - eBias) } if (value * c >= 2) { e++ c /= 2 } if (e + eBias >= eMax) { m = 0 e = eMax } else if (e + eBias >= 1) { m = ((value * c) - 1) * Math.pow(2, mLen) e = e + eBias } else { m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen) e = 0 } } for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {} e = (e << mLen) | m eLen += mLen for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {} buffer[offset + i - d] |= s * 128 } node-ieee754-1.1.13/package.json000066400000000000000000000015771353126452600161760ustar00rootroot00000000000000{ "name": "ieee754", "description": "Read/write IEEE754 floating point numbers from/to a Buffer or array-like object", "version": "1.1.13", "author": { "name": "Feross Aboukhadijeh", "email": "feross@feross.org", "url": "http://feross.org" }, "contributors": [ "Romain Beauxis " ], "devDependencies": { "airtap": "0.1.0", "standard": "*", "tape": "^4.0.0" }, "keywords": [ "IEEE 754", "buffer", "convert", "floating point", "ieee754" ], "license": "BSD-3-Clause", "main": "index.js", "repository": { "type": "git", "url": "git://github.com/feross/ieee754.git" }, "scripts": { "test": "standard && npm run test-node && npm run test-browser", "test-browser": "airtap -- test/*.js", "test-browser-local": "airtap --local -- test/*.js", "test-node": "tape test/*.js" } } node-ieee754-1.1.13/test/000077500000000000000000000000001353126452600146555ustar00rootroot00000000000000node-ieee754-1.1.13/test/basic.js000066400000000000000000000016611353126452600163000ustar00rootroot00000000000000var ieee754 = require('../') var test = require('tape') var EPSILON = 0.00001 test('read float', function (t) { var val = 42.42 var buf = Buffer.alloc(4) buf.writeFloatLE(val, 0) var num = ieee754.read(buf, 0, true, 23, 4) t.ok(Math.abs(num - val) < EPSILON) t.end() }) test('write float', function (t) { var val = 42.42 var buf = Buffer.alloc(4) ieee754.write(buf, val, 0, true, 23, 4) var num = buf.readFloatLE(0) t.ok(Math.abs(num - val) < EPSILON) t.end() }) test('read double', function (t) { var value = 12345.123456789 var buf = Buffer.alloc(8) buf.writeDoubleLE(value, 0) var num = ieee754.read(buf, 0, true, 52, 8) t.ok(Math.abs(num - value) < EPSILON) t.end() }) test('write double', function (t) { var value = 12345.123456789 var buf = Buffer.alloc(8) ieee754.write(buf, value, 0, true, 52, 8) var num = buf.readDoubleLE(0) t.ok(Math.abs(num - value) < EPSILON) t.end() })