Add TLV / LV / KLV Decoding Operation

[GCHQ77703]

Currently with a single, dysfunctional test.

[GCHQ77703]

Hey @n1474335, could I bother you for a second to take a look at why the tests are failing? The TLV / KLV / LV operation seems to be working just fine but no matter what I enter into the input and expectedOutput I appear to get the following error:

>> (node:2926) ExperimentalWarning: The ESM module loader is experimental.
>> { SyntaxError: Unexpected end of JSON input
>>     at JSON.parse (<anonymous>)
>>     at Dish._translate (<redacted>/CyberChef/src/core/Dish.mjs:213:35)
>>     at Dish.get (<redacted>/CyberChef/src/core/Dish.mjs:137:24)
>>     at Recipe.execute (<redacted>/CyberChef/src/core/Recipe.mjs:155:36)
>>     at Chef.bake (<redacted>/CyberChef/src/core/Chef.mjs:83:37)
>>     at <redacted>/CyberChef/test/TestRegister.mjs:43:29
>>     at Array.map (<anonymous>)
>>     at TestRegister.runTests (<redacted>/CyberChef/test/TestRegister.mjs:40:24)
>>     at <redacted>/CyberChef/test/index.mjs:127:14
>>     at ModuleJob.run (internal/loader/ModuleJob.js:97:14)
>>   progress: 0,
>>   displayStr: 'To MessagePack - Unexpected end of JSON input' }
>> (node:2926) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'module' of undefined
>>     at Recipe._parseConfig (<redacted>/CyberChef/src/core/Recipe.mjs:42:44)
>>     at new Recipe (<redacted>/CyberChef/src/core/Recipe.mjs:27:18)
>>     at Chef.bake (<redacted>/CyberChef/src/core/Chef.mjs:44:27)
>>     at <redacted>/CyberChef/test/TestRegister.mjs:43:29
>>     at Array.map (<anonymous>)
>>     at TestRegister.runTests (<redacted>/CyberChef/test/TestRegister.mjs:40:24)
>>     at <redacted>/CyberChef/test/index.mjs:127:14
>>     at ModuleJob.run (internal/loader/ModuleJob.js:97:14)
>>     at <anonymous>
>> (node:2926) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 3)
>> (node:2926) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
Tests took longer than 10 seconds to run, returning.

Even if I alter the output of the LV decoder to be string instead of JSON, it still prints the same JSON error message.

[n1474335]

This looks great, really looking forward to merging these ops. Just a few things to sort out, but thanks very much for taking them on, they'll be really useful.

[n1474335]

I'd rename this to something like 'LV Decode'. Then we can have an 'LV Encode' operation that does the opposite.

[n1474335]

Add a link to the appropriate wiki page

[n1474335]

This is the wrong argument type to use. Take a look here for a description of each of the ingredient types: https://github.com/gchq/CyberChef/wiki/Adding-a-new-operation#data-types

[n1474335]

I can see your logic here and it should probably be possible to do, but as it stands, tests expect all input and output to be a string, in the same way that the web app takes all input as a string and returns all output as a string.

The data will be converted to a byteArray automatically by CyberChef before it is passed to the operation.

In this case, you probably want to pass in "\x05\x48\x6f\x75\x73\x65\x04\x72\x6f\x6f\x6d\x04\x64\x6f\x6f\x72" and expect JSON.stringify([{"key": [25]..., null, 4).