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Implement TLV / KLV

This commit is contained in:
GCHQ 77703 2018-08-27 14:57:24 +01:00
parent 032b4bed7f
commit 06d9302d96
1 changed files with 31 additions and 7 deletions
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38
src/core/operations/LengthValueDecoder.mjs
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@ -20,11 +20,33 @@ class FromLengthValue extends Operation {
this.name = "From Length Value";
this.module = "Default";
this.description = "Converts a Length-Value (LV) encoded string into a line-delimited JSON (LDJSON / Streaming JSON) format";
this.description = "Converts a Length-Value (LV) encoded string into a JSON object. Can optionally include a <code>Key</code> / <code>Type</code> entry.";
this.infoURL = "";
this.inputType = "byteArray";
this.outputType = "string";
this.outputType = "JSON";
this.args = [
{
name: "Bytes in Key Value",
type: "populateOption",
value: [
{
name: "0 Bytes (No Key)",
value: "0"
},
{
name: "1 Byte",
value: "1"
},
{
name: "2 Bytes",
value: "2"
},
{
name: "4 Bytes",
value: "4"
}
]
},
{
name: "Bytes in Length Value",
type: "populateOption",
@ -56,7 +78,8 @@ class FromLengthValue extends Operation {
* @returns {string}
*/
run(input, args) {
const bytesInLength = parseInt(args[0].split(" ")[0], 10);
const bytesInKey = parseInt(args[0].split(" ")[0], 10);
const bytesInLength = parseInt(args[1].split(" ")[0], 10);
const basicEncodingRules = args[2];
const lv = new LengthValue(input, { bytesInLength, basicEncodingRules });
@ -64,13 +87,14 @@ class FromLengthValue extends Operation {
const data = [];
while (!lv.atEnd()) {
const dataLength = lv.getLength();
const value = lv.getValue(dataLength);
const key = bytesInKey ? lv.getValue(bytesInKey) : undefined;
const length = lv.getLength();
const value = lv.getValue(length);
data.push(value);
data.push({ key, length, value });
}
return data.map(line => line.map(value => ("00" + value.toString(16)).slice(-2)).join(" ")).join("\n");
return data;
}
}