@ipfn/cell-codecs/dist/src/prefix.js

IPFN cell codecs

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const multicodec = require("multicodec");
const util_1 = require("multicodec/src/util");
const codecs_1 = require("./codecs");
function prepend(body, name) {
    const codec = codecs_1.codecByName(name);
    if (!codec.hex) {
        return body;
    }
    return multicodec.addPrefix(name, body);
}
exports.prepend = prepend;
function splitPrefix(body) {
    if (isJSONObject(body)) {
        const codec = codecs_1.codecByName('cell-json-v1');
        return [codec, body];
    }
    const buffer = body instanceof Buffer ? body : Buffer.from(body);
    const prefix = util_1.varintBufferDecode(buffer).toString('hex');
    const codec = codecs_1.codecByHex(prefix);
    return [codec, multicodec.rmPrefix(buffer)];
}
exports.splitPrefix = splitPrefix;
function isJSONObject(body) {
    body = body.toString();
    const length = body.length;
    return length >= 2 && body[0] === '{' && body[length - 1] === '}';
}