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Merge pull request #1762 from gchq/feature/floats

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a3957273 2024-03-30 18:34:07 +00:00 committed by GitHub
parent b88fbcc960 6efa2ddfa4
commit 75a28b558e
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1
package-lock.json generated
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@ -46,6 +46,7 @@
"flat": "^6.0.1",
"geodesy": "1.1.3",
"highlight.js": "^11.9.0",
"ieee754": "^1.1.13",
"jimp": "^0.16.13",
"jquery": "3.7.1",
"js-crc": "^0.2.0",

1
package.json
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@ -122,6 +122,7 @@
"escodegen": "^2.1.0",
"esprima": "^4.0.1",
"exif-parser": "^0.1.12",
"ieee754": "^1.1.13",
"fernet": "^0.3.2",
"file-saver": "^2.0.5",
"flat": "^6.0.1",

2
src/core/config/Categories.json
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@ -14,6 +14,8 @@
"From Charcode",
"To Decimal",
"From Decimal",
"To Float",
"From Float",
"To Binary",
"From Binary",
"To Octal",

78
src/core/operations/FromFloat.mjs Normal file
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@ -0,0 +1,78 @@
/**
* @author tcode2k16 [tcode2k16@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import Utils from "../Utils.mjs";
import ieee754 from "ieee754";
import {DELIM_OPTIONS} from "../lib/Delim.mjs";
/**
* From Float operation
*/
class FromFloat extends Operation {
/**
* FromFloat constructor
*/
constructor() {
super();
this.name = "From Float";
this.module = "Default";
this.description = "Convert from EEE754 Floating Point Numbers";
this.infoURL = "https://en.wikipedia.org/wiki/IEEE_754";
this.inputType = "string";
this.outputType = "byteArray";
this.args = [
{
"name": "Endianness",
"type": "option",
"value": [
"Big Endian",
"Little Endian"
]
},
{
"name": "Size",
"type": "option",
"value": [
"Float (4 bytes)",
"Double (8 bytes)"
]
},
{
"name": "Delimiter",
"type": "option",
"value": DELIM_OPTIONS
}
];
}
/**
* @param {string} input
* @param {Object[]} args
* @returns {byteArray}
*/
run(input, args) {
if (input.length === 0) return [];
const [endianness, size, delimiterName] = args;
const delim = Utils.charRep(delimiterName || "Space");
const byteSize = size === "Double (8 bytes)" ? 8 : 4;
const isLE = endianness === "Little Endian";
const mLen = byteSize === 4 ? 23 : 52;
const floats = input.split(delim);
const output = new Array(floats.length*byteSize);
for (let i = 0; i < floats.length; i++) {
ieee754.write(output, parseFloat(floats[i]), i*byteSize, isLE, mLen, byteSize);
}
return output;
}
}
export default FromFloat;

80
src/core/operations/ToFloat.mjs Normal file
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@ -0,0 +1,80 @@
/**
* @author tcode2k16 [tcode2k16@gmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
import Utils from "../Utils.mjs";
import ieee754 from "ieee754";
import {DELIM_OPTIONS} from "../lib/Delim.mjs";
/**
* To Float operation
*/
class ToFloat extends Operation {
/**
* ToFloat constructor
*/
constructor() {
super();
this.name = "To Float";
this.module = "Default";
this.description = "Convert to EEE754 Floating Point Numbers";
this.infoURL = "https://en.wikipedia.org/wiki/IEEE_754";
this.inputType = "byteArray";
this.outputType = "string";
this.args = [
{
"name": "Endianness",
"type": "option",
"value": [
"Big Endian",
"Little Endian"
]
},
{
"name": "Size",
"type": "option",
"value": [
"Float (4 bytes)",
"Double (8 bytes)"
]
},
{
"name": "Delimiter",
"type": "option",
"value": DELIM_OPTIONS
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {string}
*/
run(input, args) {
const [endianness, size, delimiterName] = args;
const delim = Utils.charRep(delimiterName || "Space");
const byteSize = size === "Double (8 bytes)" ? 8 : 4;
const isLE = endianness === "Little Endian";
const mLen = byteSize === 4 ? 23 : 52;
if (input.length % byteSize !== 0) {
throw new OperationError(`Input is not a multiple of ${byteSize}`);
}
const output = [];
for (let i = 0; i < input.length; i+=byteSize) {
output.push(ieee754.read(input, i, isLE, mLen, byteSize));
}
return output.join(delim);
}
}
export default ToFloat;

1
tests/operations/index.mjs
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@ -62,6 +62,7 @@ import "./tests/DefangIP.mjs";
import "./tests/ELFInfo.mjs";
import "./tests/Enigma.mjs";
import "./tests/ExtractEmailAddresses.mjs";
import "./tests/Float.mjs";
import "./tests/FileTree.mjs";
import "./tests/FletcherChecksum.mjs";
import "./tests/Fork.mjs";

164
tests/operations/tests/Float.mjs Normal file
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@ -0,0 +1,164 @@
/**
* Float tests.
*
* @author tcode2k16 [tcode2k16@gmail.com]
*
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import TestRegister from "../../lib/TestRegister.mjs";
TestRegister.addTests([
{
name: "To Float: nothing",
input: "",
expectedOutput: "",
recipeConfig: [
{
op: "From Hex",
args: ["Auto"]
},
{
op: "To Float",
args: ["Big Endian", "Float (4 bytes)", "Space"]
}
],
},
{
name: "To Float (Big Endian, 4 bytes): 0.5",
input: "3f0000003f000000",
expectedOutput: "0.5 0.5",
recipeConfig: [
{
op: "From Hex",
args: ["Auto"]
},
{
op: "To Float",
args: ["Big Endian", "Float (4 bytes)", "Space"]
}
]
},
{
name: "To Float (Little Endian, 4 bytes): 0.5",
input: "0000003f0000003f",
expectedOutput: "0.5 0.5",
recipeConfig: [
{
op: "From Hex",
args: ["Auto"]
},
{
op: "To Float",
args: ["Little Endian", "Float (4 bytes)", "Space"]
}
]
},
{
name: "To Float (Big Endian, 8 bytes): 0.5",
input: "3fe00000000000003fe0000000000000",
expectedOutput: "0.5 0.5",
recipeConfig: [
{
op: "From Hex",
args: ["Auto"]
},
{
op: "To Float",
args: ["Big Endian", "Double (8 bytes)", "Space"]
}
]
},
{
name: "To Float (Little Endian, 8 bytes): 0.5",
input: "000000000000e03f000000000000e03f",
expectedOutput: "0.5 0.5",
recipeConfig: [
{
op: "From Hex",
args: ["Auto"]
},
{
op: "To Float",
args: ["Little Endian", "Double (8 bytes)", "Space"]
}
]
},
{
name: "From Float: nothing",
input: "",
expectedOutput: "",
recipeConfig: [
{
op: "From Float",
args: ["Big Endian", "Float (4 bytes)", "Space"]
},
{
op: "To Hex",
args: ["None"]
}
]
},
{
name: "From Float (Big Endian, 4 bytes): 0.5",
input: "0.5 0.5",
expectedOutput: "3f0000003f000000",
recipeConfig: [
{
op: "From Float",
args: ["Big Endian", "Float (4 bytes)", "Space"]
},
{
op: "To Hex",
args: ["None"]
}
]
},
{
name: "From Float (Little Endian, 4 bytes): 0.5",
input: "0.5 0.5",
expectedOutput: "0000003f0000003f",
recipeConfig: [
{
op: "From Float",
args: ["Little Endian", "Float (4 bytes)", "Space"]
},
{
op: "To Hex",
args: ["None"]
}
]
},
{
name: "From Float (Big Endian, 8 bytes): 0.5",
input: "0.5 0.5",
expectedOutput: "3fe00000000000003fe0000000000000",
recipeConfig: [
{
op: "From Float",
args: ["Big Endian", "Double (8 bytes)", "Space"]
},
{
op: "To Hex",
args: ["None"]
}
]
},
{
name: "From Float (Little Endian, 8 bytes): 0.5",
input: "0.5 0.5",
expectedOutput: "000000000000e03f000000000000e03f",
recipeConfig: [
{
op: "From Float",
args: ["Little Endian", "Double (8 bytes)", "Space"]
},
{
op: "To Hex",
args: ["None"]
}
]
}
]);