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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | 1x 1x 125x 110x 104x 96x 92x 92x 5x 87x 87x 73x 9x 64x 4x 60x | import { BufferReader } from "@node-lightning/bufio";
/**
* Reads TLVs from a reader until the entire stream is processed. The handler is
* responsible for doing something with the data bytes.
* @param reader
* @param handler
*/
export function readTlvs(
reader: BufferReader,
handler: (type: bigint, value: BufferReader) => boolean,
) {
let lastType: bigint;
while (!reader.eof) {
const type = reader.readBigSize();
const len = reader.readBigSize();
const value = reader.readBytes(Number(len));
const valueReader = new BufferReader(value);
if (type <= lastType) {
throw new Error("Invalid TLV stream");
}
const isEven = type % BigInt(2) === BigInt(0);
const wasHandled = handler(type, valueReader);
if (!wasHandled && isEven) {
throw new Error("Unknown even type");
}
if (wasHandled && !valueReader.eof) {
throw new Error("Non-canonical length");
}
lastType = type;
}
}
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