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Merge pull request #1914 from Oshawk/drop-nth-bytes

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Add 'Drop nth bytes' operation
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a3957273 2025-02-14 15:43:41 +00:00 committed by GitHub
commit dcf0bbb02b
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4 changed files with 205 additions and 1 deletions
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3
src/core/config/Categories.json
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@ -326,7 +326,8 @@
"Unescape string",
"Pseudo-Random Number Generator",
"Sleep",
"File Tree"
"File Tree",
"Drop nth bytes"
]
},
{

79
src/core/operations/DropNthBytes.mjs Normal file
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@ -0,0 +1,79 @@
/**
* @author Oshawk [oshawk@protonmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import Operation from "../Operation.mjs";
import OperationError from "../errors/OperationError.mjs";
/**
* Drop nth bytes operation
*/
class DropNthBytes extends Operation {
/**
* DropNthBytes constructor
*/
constructor() {
super();
this.name = "Drop nth bytes";
this.module = "Default";
this.description = "Drops every nth byte starting with a given byte.";
this.infoURL = "";
this.inputType = "byteArray";
this.outputType = "byteArray";
this.args = [
{
name: "Drop every",
type: "number",
value: 4
},
{
name: "Starting at",
type: "number",
value: 0
},
{
name: "Apply to each line",
type: "boolean",
value: false
}
];
}
/**
* @param {byteArray} input
* @param {Object[]} args
* @returns {byteArray}
*/
run(input, args) {
const n = args[0];
const start = args[1];
const eachLine = args[2];
if (parseInt(n, 10) !== n || n <= 0) {
throw new OperationError("'Drop every' must be a positive integer.");
}
if (parseInt(start, 10) !== start || start < 0) {
throw new OperationError("'Starting at' must be a positive or zero integer.");
}
let offset = 0;
const output = [];
for (let i = 0; i < input.length; i++) {
if (eachLine && input[i] === 0x0a) {
output.push(0x0a);
offset = i + 1;
} else if (i - offset < start || (i - (start + offset)) % n !== 0) {
output.push(input[i]);
}
}
return output;
}
}
export default DropNthBytes;

1
tests/operations/index.mjs
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@ -59,6 +59,7 @@ import "./tests/Crypt.mjs";
import "./tests/CSV.mjs";
import "./tests/DateTime.mjs";
import "./tests/DefangIP.mjs";
import "./tests/DropNthBytes.mjs";
import "./tests/ECDSA.mjs";
import "./tests/ELFInfo.mjs";
import "./tests/Enigma.mjs";

123
tests/operations/tests/DropNthBytes.mjs Normal file
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@ -0,0 +1,123 @@
/**
* @author Oshawk [oshawk@protonmail.com]
* @copyright Crown Copyright 2019
* @license Apache-2.0
*/
import TestRegister from "../../lib/TestRegister.mjs";
/**
* Drop nth bytes tests
*/
TestRegister.addTests([
{
name: "Drop nth bytes: Nothing",
input: "",
expectedOutput: "",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, false],
},
],
},
{
name: "Drop nth bytes: Nothing (apply to each line)",
input: "",
expectedOutput: "",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, true],
},
],
},
{
name: "Drop nth bytes: Basic single line",
input: "0123456789",
expectedOutput: "1235679",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, false],
},
],
},
{
name: "Drop nth bytes: Basic single line (apply to each line)",
input: "0123456789",
expectedOutput: "1235679",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, true],
},
],
},
{
name: "Drop nth bytes: Complex single line",
input: "0123456789",
expectedOutput: "01234678",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 5, false],
},
],
},
{
name: "Drop nth bytes: Complex single line (apply to each line)",
input: "0123456789",
expectedOutput: "01234678",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 5, true],
},
],
},
{
name: "Drop nth bytes: Basic multi line",
input: "01234\n56789",
expectedOutput: "123\n5689",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, false],
},
],
},
{
name: "Drop nth bytes: Basic multi line (apply to each line)",
input: "01234\n56789",
expectedOutput: "123\n678",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 0, true],
},
],
},
{
name: "Drop nth bytes: Complex multi line",
input: "01234\n56789",
expectedOutput: "012345679",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 5, false],
},
],
},
{
name: "Drop nth bytes: Complex multi line (apply to each line)",
input: "012345\n6789ab",
expectedOutput: "01234\n6789a",
recipeConfig: [
{
op: "Drop nth bytes",
args: [4, 5, true],
},
],
}
]);