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import { tinyCbor } from '../../deps.ts';
/**
* Whatever CBOR encoder is used should keep CBOR data the same length when data is re-encoded
*
* MOST CRITICALLY, this means the following needs to be true of whatever CBOR library we use:
* - CBOR Map type values MUST decode to JavaScript Maps
* - CBOR tag 64 (uint8 Typed Array) MUST NOT be used when encoding Uint8Arrays back to CBOR
*
* So long as these requirements are maintained, then CBOR sequences can be encoded and decoded
* freely while maintaining their lengths for the most accurate pointer movement across them.
*/
/**
* Decode and return the first item in a sequence of CBOR-encoded values
*
* @param input The CBOR data to decode
* @param asObject (optional) Whether to convert any CBOR Maps into JavaScript Objects. Defaults to
* `false`
*/
export function decodeFirst<Type>(input: Uint8Array): Type {
// Make a copy so we don't mutate the original
const _input = new Uint8Array(input);
const decoded = tinyCbor.decodePartialCBOR(_input, 0) as [Type, number];
const [first] = decoded;
return first;
}
/**
* Encode data to CBOR
*/
export function encode(input: tinyCbor.CBORType): Uint8Array {
return tinyCbor.encodeCBOR(input);
}
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