@ckb-lumos/codec/lib/molecule/helper.js

Make your own molecule binding in JavaScript(TypeScript)

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.byteArrayOf = byteArrayOf;
exports.byteOf = byteOf;
exports.byteVecOf = byteVecOf;
var _utils = require("../utils");
var _bytes = require("../bytes");
var _base = require("../base");
var _number = require("../number");
/**
 * a helper function to create custom codec of `array SomeType [byte; n]`
 * @param codec
 */
function byteArrayOf(codec) {
  const byteLength = codec.byteLength;
  return (0, _base.createFixedBytesCodec)({
    byteLength,
    pack: packable => codec.pack(packable),
    unpack: buf => codec.unpack(buf)
  });
}

/**
 * a helper function to create custom codec of `byte`
 * @param codec
 */
function byteOf(codec) {
  return byteArrayOf({
    ...codec,
    byteLength: 1
  });
}

/**
 * a helper function to create custom codec of `vector Bytes <byte>`
 * @param codec
 */
function byteVecOf(codec) {
  return (0, _base.createBytesCodec)({
    pack(unpacked) {
      const payload = codec.pack(unpacked);
      const header = _number.Uint32LE.pack(payload.byteLength);
      return (0, _bytes.concat)(header, payload);
    },
    unpack(packed) {
      (0, _utils.assertMinBufferLength)(packed, 4);
      const header = _number.Uint32LE.unpack(packed.slice(0, 4));
      (0, _utils.assertBufferLength)(packed.slice(4), header);
      return codec.unpack(packed.slice(4));
    }
  });
}
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