diff options
Diffstat (limited to 'node_modules/ieee754')
| -rw-r--r-- | node_modules/ieee754/.travis.yml | 7 | ||||
| -rw-r--r-- | node_modules/ieee754/.zuul.yml | 20 | ||||
| -rw-r--r-- | node_modules/ieee754/LICENSE | 28 | ||||
| -rw-r--r-- | node_modules/ieee754/README.md | 47 | ||||
| -rw-r--r-- | node_modules/ieee754/index.js | 84 | ||||
| -rw-r--r-- | node_modules/ieee754/package.json | 37 | ||||
| -rw-r--r-- | node_modules/ieee754/test/basic.js | 23 |
7 files changed, 246 insertions, 0 deletions
diff --git a/node_modules/ieee754/.travis.yml b/node_modules/ieee754/.travis.yml new file mode 100644 index 000000000..6c45b34d1 --- /dev/null +++ b/node_modules/ieee754/.travis.yml @@ -0,0 +1,7 @@ +language: node_js +node_js: +- 'node' +env: + global: + - secure: f3NrmOV/A7oACn47J1mkIpH8Sn/LINtluZvo/9pGo3Ss4+D2lyt7UawpedHtnYgU9WEyjPSi7pDWopUrIzusQ2trLYRJr8WAOEyHlgaepDyy4BW3ghGMKHMsS05kilYLP8nu1sRd6y1AcUYKw+kUrrSPanI7kViWVQ5d5DuwXO8= + - secure: a6teILh33z5fbGQbh5/EkFfAyXfa2fPJG1upy9K+jLAbG4WZxXD+YmXG9Tz33/2NJm6UplGfTJ8IQEXgxEfAFk3ao3xfKxzm3i64XxtroSlXIFNSiQKogxDfLEtWDoNNCodPHaV3ATEqxGJ5rkkUeU1+ROWW0sjG5JR26k8/Hfg= diff --git a/node_modules/ieee754/.zuul.yml b/node_modules/ieee754/.zuul.yml new file mode 100644 index 000000000..b5ba0c4ac --- /dev/null +++ b/node_modules/ieee754/.zuul.yml @@ -0,0 +1,20 @@ +ui: tape +scripts: + - "./test/_polyfill.js" +browsers: + - name: chrome + version: latest + - name: firefox + version: latest + - name: safari + version: latest + - name: ie + version: 11 + - name: microsoftedge + version: latest + - name: opera + version: latest + - name: android + version: latest + - name: iphone + version: latest diff --git a/node_modules/ieee754/LICENSE b/node_modules/ieee754/LICENSE new file mode 100644 index 000000000..f37a2ebe2 --- /dev/null +++ b/node_modules/ieee754/LICENSE @@ -0,0 +1,28 @@ +Copyright (c) 2008, Fair Oaks Labs, Inc. +All rights reserved. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are met: + + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + + * 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. + + * Neither the name of Fair Oaks Labs, Inc. 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 OWNER 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. diff --git a/node_modules/ieee754/README.md b/node_modules/ieee754/README.md new file mode 100644 index 000000000..11f4d40c1 --- /dev/null +++ b/node_modules/ieee754/README.md @@ -0,0 +1,47 @@ +# ieee754 [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![downloads][downloads-image]][npm-url] + +[![saucelabs][saucelabs-image]][saucelabs-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 +[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 +``` + +## 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. diff --git a/node_modules/ieee754/index.js b/node_modules/ieee754/index.js new file mode 100644 index 000000000..95e190c42 --- /dev/null +++ b/node_modules/ieee754/index.js @@ -0,0 +1,84 @@ +exports.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 +} diff --git a/node_modules/ieee754/package.json b/node_modules/ieee754/package.json new file mode 100644 index 000000000..681f0de8e --- /dev/null +++ b/node_modules/ieee754/package.json @@ -0,0 +1,37 @@ +{ + "name": "ieee754", + "description": "Read/write IEEE754 floating point numbers from/to a Buffer or array-like object", + "version": "1.1.8", + "author": { + "name": "Feross Aboukhadijeh", + "email": "feross@feross.org", + "url": "http://feross.org" + }, + "contributors": [ + "Romain Beauxis <toots@rastageeks.org>" + ], + "devDependencies": { + "standard": "*", + "tape": "^4.0.0", + "zuul": "^3.0.0" + }, + "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": "zuul -- test/*.js", + "test-browser-local": "zuul --local -- test/*.js", + "test-node": "tape test/*.js" + } +} diff --git a/node_modules/ieee754/test/basic.js b/node_modules/ieee754/test/basic.js new file mode 100644 index 000000000..58fae2bf2 --- /dev/null +++ b/node_modules/ieee754/test/basic.js @@ -0,0 +1,23 @@ +var ieee754 = require('../') +var test = require('tape') + +var EPSILON = 0.00001 + +test('read float', function (t) { + var buf = new Buffer(4) + buf.writeFloatLE(42.42, 0) + var num = ieee754.read(buf, 0, true, 23, 4) + t.ok(Math.abs(num - 42.42) < EPSILON) + + t.end() +}) + +test('write float', function (t) { + var buf = new Buffer(4) + ieee754.write(buf, 42.42, 0, true, 23, 4) + + var num = buf.readFloatLE(0) + t.ok(Math.abs(num - 42.42) < EPSILON) + + t.end() +}) |