Improvements to Entropy operation. Converted to ArrayBuffers, improved efficiency with large files, added present method back in.
This commit is contained in:
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b0b6de116d
commit
c1ad2386ef
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"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5657,38 +5708,46 @@
|
||||
},
|
||||
"number-is-nan": {
|
||||
"version": "1.0.1",
|
||||
"bundled": true,
|
||||
"dev": true
|
||||
"resolved": "https://registry.npmjs.org/number-is-nan/-/number-is-nan-1.0.1.tgz",
|
||||
"integrity": "sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"object-assign": {
|
||||
"version": "4.1.1",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
|
||||
"integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"once": {
|
||||
"version": "1.4.0",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
|
||||
"integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
"wrappy": "1"
|
||||
}
|
||||
},
|
||||
"os-homedir": {
|
||||
"version": "1.0.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/os-homedir/-/os-homedir-1.0.2.tgz",
|
||||
"integrity": "sha1-/7xJiDNuDoM94MFox+8VISGqf7M=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"os-tmpdir": {
|
||||
"version": "1.0.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/os-tmpdir/-/os-tmpdir-1.0.2.tgz",
|
||||
"integrity": "sha1-u+Z0BseaqFxc/sdm/lc0VV36EnQ=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"osenv": {
|
||||
"version": "0.1.5",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/osenv/-/osenv-0.1.5.tgz",
|
||||
"integrity": "sha512-0CWcCECdMVc2Rw3U5w9ZjqX6ga6ubk1xDVKxtBQPK7wis/0F2r9T6k4ydGYhecl7YUBxBVxhL5oisPsNxAPe2g==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5698,19 +5757,22 @@
|
||||
},
|
||||
"path-is-absolute": {
|
||||
"version": "1.0.1",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
|
||||
"integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"process-nextick-args": {
|
||||
"version": "2.0.0",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
|
||||
"integrity": "sha512-MtEC1TqN0EU5nephaJ4rAtThHtC86dNN9qCuEhtshvpVBkAW5ZO7BASN9REnF9eoXGcRub+pFuKEpOHE+HbEMw==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"rc": {
|
||||
"version": "1.2.8",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
|
||||
"integrity": "sha512-y3bGgqKj3QBdxLbLkomlohkvsA8gdAiUQlSBJnBhfn+BPxg4bc62d8TcBW15wavDfgexCgccckhcZvywyQYPOw==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5722,7 +5784,8 @@
|
||||
"dependencies": {
|
||||
"minimist": {
|
||||
"version": "1.2.0",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
|
||||
"integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
}
|
||||
@ -5730,7 +5793,8 @@
|
||||
},
|
||||
"readable-stream": {
|
||||
"version": "2.3.6",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.6.tgz",
|
||||
"integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5745,7 +5809,8 @@
|
||||
},
|
||||
"rimraf": {
|
||||
"version": "2.6.3",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/rimraf/-/rimraf-2.6.3.tgz",
|
||||
"integrity": "sha512-mwqeW5XsA2qAejG46gYdENaxXjx9onRNCfn7L0duuP4hCuTIi/QO7PDK07KJfp1d+izWPrzEJDcSqBa0OZQriA==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5754,43 +5819,52 @@
|
||||
},
|
||||
"safe-buffer": {
|
||||
"version": "5.1.2",
|
||||
"bundled": true,
|
||||
"dev": true
|
||||
"resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
|
||||
"integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"safer-buffer": {
|
||||
"version": "2.1.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
|
||||
"integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"sax": {
|
||||
"version": "1.2.4",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/sax/-/sax-1.2.4.tgz",
|
||||
"integrity": "sha512-NqVDv9TpANUjFm0N8uM5GxL36UgKi9/atZw+x7YFnQ8ckwFGKrl4xX4yWtrey3UJm5nP1kUbnYgLopqWNSRhWw==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"semver": {
|
||||
"version": "5.7.0",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/semver/-/semver-5.7.0.tgz",
|
||||
"integrity": "sha512-Ya52jSX2u7QKghxeoFGpLwCtGlt7j0oY9DYb5apt9nPlJ42ID+ulTXESnt/qAQcoSERyZ5sl3LDIOw0nAn/5DA==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"set-blocking": {
|
||||
"version": "2.0.0",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
|
||||
"integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"signal-exit": {
|
||||
"version": "3.0.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.2.tgz",
|
||||
"integrity": "sha1-tf3AjxKH6hF4Yo5BXiUTK3NkbG0=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"string-width": {
|
||||
"version": "1.0.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
|
||||
"integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
"code-point-at": "^1.0.0",
|
||||
"is-fullwidth-code-point": "^1.0.0",
|
||||
@ -5799,7 +5873,8 @@
|
||||
},
|
||||
"string_decoder": {
|
||||
"version": "1.1.1",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
|
||||
"integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5808,21 +5883,25 @@
|
||||
},
|
||||
"strip-ansi": {
|
||||
"version": "3.0.1",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
|
||||
"integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
"ansi-regex": "^2.0.0"
|
||||
}
|
||||
},
|
||||
"strip-json-comments": {
|
||||
"version": "2.0.1",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
|
||||
"integrity": "sha1-PFMZQukIwml8DsNEhYwobHygpgo=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"tar": {
|
||||
"version": "4.4.8",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/tar/-/tar-4.4.8.tgz",
|
||||
"integrity": "sha512-LzHF64s5chPQQS0IYBn9IN5h3i98c12bo4NCO7e0sGM2llXQ3p2FGC5sdENN4cTW48O915Sh+x+EXx7XW96xYQ==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5837,13 +5916,15 @@
|
||||
},
|
||||
"util-deprecate": {
|
||||
"version": "1.0.2",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
|
||||
"integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"wide-align": {
|
||||
"version": "1.1.3",
|
||||
"bundled": true,
|
||||
"resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.3.tgz",
|
||||
"integrity": "sha512-QGkOQc8XL6Bt5PwnsExKBPuMKBxnGxWWW3fU55Xt4feHozMUhdUMaBCk290qpm/wG5u/RSKzwdAC4i51YigihA==",
|
||||
"dev": true,
|
||||
"optional": true,
|
||||
"requires": {
|
||||
@ -5852,13 +5933,17 @@
|
||||
},
|
||||
"wrappy": {
|
||||
"version": "1.0.2",
|
||||
"bundled": true,
|
||||
"dev": true
|
||||
"resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
|
||||
"integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
},
|
||||
"yallist": {
|
||||
"version": "3.0.3",
|
||||
"bundled": true,
|
||||
"dev": true
|
||||
"resolved": "https://registry.npmjs.org/yallist/-/yallist-3.0.3.tgz",
|
||||
"integrity": "sha512-S+Zk8DEWE6oKpV+vI3qWkaK+jSbIK86pCwe2IF/xwIpQ8jEuxpw9NyaGjmp9+BoJv5FV2piqCDcoCtStppiq2A==",
|
||||
"dev": true,
|
||||
"optional": true
|
||||
}
|
||||
}
|
||||
},
|
||||
|
@ -8,7 +8,6 @@ import * as d3temp from "d3";
|
||||
import * as nodomtemp from "nodom";
|
||||
|
||||
import Operation from "../Operation";
|
||||
import Utils from "../Utils";
|
||||
|
||||
const d3 = d3temp.default ? d3temp.default : d3temp;
|
||||
const nodom = nodomtemp.default ? nodomtemp.default: nodomtemp;
|
||||
@ -25,16 +24,17 @@ class Entropy extends Operation {
|
||||
super();
|
||||
|
||||
this.name = "Entropy";
|
||||
this.module = "Default";
|
||||
this.module = "Charts";
|
||||
this.description = "Shannon Entropy, in the context of information theory, is a measure of the rate at which information is produced by a source of data. It can be used, in a broad sense, to detect whether data is likely to be structured or unstructured. 8 is the maximum, representing highly unstructured, 'random' data. English language text usually falls somewhere between 3.5 and 5. Properly encrypted or compressed data should have an entropy of over 7.5.";
|
||||
this.infoURL = "https://wikipedia.org/wiki/Entropy_(information_theory)";
|
||||
this.inputType = "byteArray";
|
||||
this.outputType = "html";
|
||||
this.inputType = "ArrayBuffer";
|
||||
this.outputType = "json";
|
||||
this.presentType = "html";
|
||||
this.args = [
|
||||
{
|
||||
"name": "Visualisation",
|
||||
"type": "option",
|
||||
"value": ["Shannon", "Histogram (Bar)", "Histogram (Line)", "Curve", "Image"]
|
||||
"value": ["Shannon scale", "Histogram (Bar)", "Histogram (Line)", "Curve", "Image"]
|
||||
}
|
||||
];
|
||||
}
|
||||
@ -42,19 +42,27 @@ class Entropy extends Operation {
|
||||
/**
|
||||
* Calculates the frequency of bytes in the input.
|
||||
*
|
||||
* @param {byteArray} input
|
||||
* @returns {frequency}
|
||||
* @param {Uint8Array} input
|
||||
* @returns {number}
|
||||
*/
|
||||
calculateShannonEntropy(input) {
|
||||
const prob = [],
|
||||
uniques = input.unique(),
|
||||
str = Utils.byteArrayToChars(input);
|
||||
occurrences = new Array(256).fill(0);
|
||||
|
||||
// Count occurrences of each byte in the input
|
||||
let i;
|
||||
for (i = 0; i < uniques.length; i++) {
|
||||
prob.push(str.count(Utils.chr(uniques[i])) / input.length);
|
||||
for (i = 0; i < input.length; i++) {
|
||||
occurrences[input[i]]++;
|
||||
}
|
||||
|
||||
// Store probability list
|
||||
for (i = 0; i < occurrences.length; i++) {
|
||||
if (occurrences[i] > 0) {
|
||||
prob.push(occurrences[i] / input.length);
|
||||
}
|
||||
}
|
||||
|
||||
// Calculate Shannon entropy
|
||||
let entropy = 0,
|
||||
p;
|
||||
|
||||
@ -67,17 +75,16 @@ class Entropy extends Operation {
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates the scanning entropy of the input
|
||||
*
|
||||
* @param inputBytes
|
||||
* @returns {entropyData}
|
||||
* @param {Uint8Array} inputBytes
|
||||
* @returns {Object}
|
||||
*/
|
||||
calculateScanningEntropy(inputBytes, binWidth) {
|
||||
calculateScanningEntropy(inputBytes) {
|
||||
const entropyData = [];
|
||||
const binWidth = inputBytes.length < 256 ? 8 : 256;
|
||||
|
||||
if (inputBytes.length < 256) binWidth = 8;
|
||||
else binWidth = 256;
|
||||
|
||||
for (let bytePos = 0; bytePos < inputBytes.length; bytePos+=binWidth) {
|
||||
for (let bytePos = 0; bytePos < inputBytes.length; bytePos += binWidth) {
|
||||
const block = inputBytes.slice(bytePos, bytePos+binWidth);
|
||||
entropyData.push(this.calculateShannonEntropy(block));
|
||||
}
|
||||
@ -96,7 +103,6 @@ class Entropy extends Operation {
|
||||
* @param {object} margins
|
||||
* @param {string} xTitle
|
||||
* @param {string} yTitle
|
||||
* @returns {undefined}
|
||||
*/
|
||||
createAxes(svg, xScale, yScale, svgHeight, svgWidth, margins, title, xTitle, yTitle) {
|
||||
// Axes
|
||||
@ -138,31 +144,31 @@ class Entropy extends Operation {
|
||||
/**
|
||||
* Calculates the frequency of bytes in the input.
|
||||
*
|
||||
* @param {byteArray} inputBytes
|
||||
* @returns {frequency}
|
||||
* @param {Uint8Array} inputBytes
|
||||
* @returns {number[]}
|
||||
*/
|
||||
calculateByteFrequency(inputBytes) {
|
||||
const byteFrequency = [];
|
||||
for (let i = 0; i < 256; i++) {
|
||||
if (inputBytes.length > 0) {
|
||||
let count = 0;
|
||||
for (const byte of inputBytes) {
|
||||
if (byte === i) count++;
|
||||
}
|
||||
byteFrequency.push(count / inputBytes.length);
|
||||
} else {
|
||||
byteFrequency.push(0);
|
||||
}
|
||||
const freq = new Array(256).fill(0);
|
||||
if (inputBytes.length === 0) return freq;
|
||||
|
||||
// Count occurrences of each byte in the input
|
||||
let i;
|
||||
for (i = 0; i < inputBytes.length; i++) {
|
||||
freq[inputBytes[i]]++;
|
||||
}
|
||||
|
||||
return byteFrequency;
|
||||
for (i = 0; i < freq.length; i++) {
|
||||
freq[i] = freq[i] / inputBytes.length;
|
||||
}
|
||||
|
||||
return freq;
|
||||
}
|
||||
|
||||
/**
|
||||
* Calculates the frequency of bytes in the input.
|
||||
*
|
||||
* @param {byteArray} byteFrequency
|
||||
* @returns {frequency}
|
||||
* @param {number[]} byteFrequency
|
||||
* @returns {HTML}
|
||||
*/
|
||||
createByteFrequencyLineHistogram(byteFrequency) {
|
||||
const margins = { top: 30, right: 20, bottom: 50, left: 30 };
|
||||
@ -205,7 +211,7 @@ class Entropy extends Operation {
|
||||
/**
|
||||
* Creates a byte frequency histogram
|
||||
*
|
||||
* @param {byteArray} byteFrequency
|
||||
* @param {number[]} byteFrequency
|
||||
* @returns {HTML}
|
||||
*/
|
||||
createByteFrequencyBarHistogram(byteFrequency) {
|
||||
@ -248,8 +254,7 @@ class Entropy extends Operation {
|
||||
/**
|
||||
* Creates a byte frequency histogram
|
||||
*
|
||||
* @param {byteArray} input
|
||||
* @param {number} blockSize
|
||||
* @param {number[]} entropyData
|
||||
* @returns {HTML}
|
||||
*/
|
||||
createEntropyCurve(entropyData) {
|
||||
@ -294,8 +299,7 @@ class Entropy extends Operation {
|
||||
/**
|
||||
* Creates an image representation of the entropy
|
||||
*
|
||||
* @param {byteArray} input
|
||||
* @param {number} blockSize
|
||||
* @param {number[]} entropyData
|
||||
* @returns {HTML}
|
||||
*/
|
||||
createEntropyImage(entropyData) {
|
||||
@ -341,7 +345,7 @@ class Entropy extends Operation {
|
||||
* Displays the entropy as a scale bar for web apps.
|
||||
*
|
||||
* @param {number} entropy
|
||||
* @returns {html}
|
||||
* @returns {HTML}
|
||||
*/
|
||||
createShannonEntropyVisualization(entropy) {
|
||||
return `Shannon entropy: ${entropy}
|
||||
@ -376,23 +380,49 @@ class Entropy extends Operation {
|
||||
}
|
||||
|
||||
/**
|
||||
* @param {byteArray} input
|
||||
* @param {ArrayBuffer} input
|
||||
* @param {Object[]} args
|
||||
* @returns {html}
|
||||
* @returns {json}
|
||||
*/
|
||||
run(input, args) {
|
||||
const visualizationType = args[0];
|
||||
input = new Uint8Array(input);
|
||||
|
||||
if (visualizationType === "Shannon") {
|
||||
return this.createShannonEntropyVisualization(this.calculateShannonEntropy(input));
|
||||
} else if (visualizationType === "Histogram (Bar)") {
|
||||
return this.createByteFrequencyBarHistogram(this.calculateByteFrequency(input));
|
||||
} else if (visualizationType === "Histogram (Line)") {
|
||||
return this.createByteFrequencyLineHistogram(this.calculateByteFrequency(input));
|
||||
} else if (visualizationType === "Curve") {
|
||||
return this.createEntropyCurve(this.calculateScanningEntropy(input).entropyData);
|
||||
} else if (visualizationType === "Image") {
|
||||
return this.createEntropyImage(this.calculateScanningEntropy(input).entropyData);
|
||||
switch (visualizationType) {
|
||||
case "Histogram (Bar)":
|
||||
case "Histogram (Line)":
|
||||
return this.calculateByteFrequency(input);
|
||||
case "Curve":
|
||||
case "Image":
|
||||
return this.calculateScanningEntropy(input).entropyData;
|
||||
case "Shannon scale":
|
||||
default:
|
||||
return this.calculateShannonEntropy(input);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Displays the entropy in a visualisation for web apps.
|
||||
*
|
||||
* @param {json} entropyData
|
||||
* @param {Object[]} args
|
||||
* @returns {html}
|
||||
*/
|
||||
present(entropyData, args) {
|
||||
const visualizationType = args[0];
|
||||
|
||||
switch (visualizationType) {
|
||||
case "Histogram (Bar)":
|
||||
return this.createByteFrequencyBarHistogram(entropyData);
|
||||
case "Histogram (Line)":
|
||||
return this.createByteFrequencyLineHistogram(entropyData);
|
||||
case "Curve":
|
||||
return this.createEntropyCurve(entropyData);
|
||||
case "Image":
|
||||
return this.createEntropyImage(entropyData);
|
||||
case "Shannon scale":
|
||||
default:
|
||||
return this.createShannonEntropyVisualization(entropyData);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
Loading…
x
Reference in New Issue
Block a user