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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/@ledgerhq/devices/lib

Просмотр файла: hid-framing.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _errors = require("@ledgerhq/errors");

const Tag = 0x05;

function asUInt16BE(value) {
  const b = Buffer.alloc(2);
  b.writeUInt16BE(value, 0);
  return b;
}

const initialAcc = {
  data: Buffer.alloc(0),
  dataLength: 0,
  sequence: 0
};
/**
 *
 */

const createHIDframing = (channel, packetSize) => {
  return {
    makeBlocks(apdu) {
      let data = Buffer.concat([asUInt16BE(apdu.length), apdu]);
      const blockSize = packetSize - 5;
      const nbBlocks = Math.ceil(data.length / blockSize);
      data = Buffer.concat([data, // fill data with padding
      Buffer.alloc(nbBlocks * blockSize - data.length + 1).fill(0)]);
      const blocks = [];

      for (let i = 0; i < nbBlocks; i++) {
        const head = Buffer.alloc(5);
        head.writeUInt16BE(channel, 0);
        head.writeUInt8(Tag, 2);
        head.writeUInt16BE(i, 3);
        const chunk = data.slice(i * blockSize, (i + 1) * blockSize);
        blocks.push(Buffer.concat([head, chunk]));
      }

      return blocks;
    },

    reduceResponse(acc, chunk) {
      let {
        data,
        dataLength,
        sequence
      } = acc || initialAcc;

      if (chunk.readUInt16BE(0) !== channel) {
        throw new _errors.TransportError("Invalid channel", "InvalidChannel");
      }

      if (chunk.readUInt8(2) !== Tag) {
        throw new _errors.TransportError("Invalid tag", "InvalidTag");
      }

      if (chunk.readUInt16BE(3) !== sequence) {
        throw new _errors.TransportError("Invalid sequence", "InvalidSequence");
      }

      if (!acc) {
        dataLength = chunk.readUInt16BE(5);
      }

      sequence++;
      const chunkData = chunk.slice(acc ? 5 : 7);
      data = Buffer.concat([data, chunkData]);

      if (data.length > dataLength) {
        data = data.slice(0, dataLength);
      }

      return {
        data,
        dataLength,
        sequence
      };
    },

    getReducedResult(acc) {
      if (acc && acc.dataLength === acc.data.length) {
        return acc.data;
      }
    }

  };
};

var _default = createHIDframing;
exports.default = _default;
//# sourceMappingURL=hid-framing.js.map

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