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Changed inputType to ArrayBuffer for 'Frequency distribution', 'Chi Square' and 'Extract EXIF' operations.

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n1474335 2017-12-28 00:24:16 +00:00
parent 50e4daeaf2
commit e18ec5f2b2
3 changed files with 16 additions and 15 deletions
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18
src/core/operations/Entropy.js
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@ -81,22 +81,23 @@ const Entropy = {
/**
* Frequency distribution operation.
*
* @param {byteArray} input
* @param {ArrayBuffer} input
* @param {Object[]} args
* @returns {html}
*/
runFreqDistrib: function (input, args) {
if (!input.length) return "No data";
const data = new Uint8Array(input);
if (!data.length) return "No data";
let distrib = new Array(256).fill(0),
percentages = new Array(256),
len = input.length,
len = data.length,
showZeroes = args[0],
i;
// Count bytes
for (i = 0; i < len; i++) {
distrib[input[i]]++;
distrib[data[i]]++;
}
// Calculate percentages
@ -138,21 +139,22 @@ const Entropy = {
/**
* Chi Square operation.
*
* @param {byteArray} data
* @param {ArrayBuffer} data
* @param {Object[]} args
* @returns {number}
*/
runChiSq: function(input, args) {
const data = new Uint8Array(input);
let distArray = new Array(256).fill(0),
total = 0;
for (let i = 0; i < input.length; i++) {
distArray[input[i]]++;
for (let i = 0; i < data.length; i++) {
distArray[data[i]]++;
}
for (let i = 0; i < distArray.length; i++) {
if (distArray[i] > 0) {
total += Math.pow(distArray[i] - input.length / 256, 2) / (input.length / 256);
total += Math.pow(distArray[i] - data.length / 256, 2) / (data.length / 256);
}
}