Function Encode

nan_string_bytes.h:224–299

static Local<Value> Encode(const char* buf,
                           size_t buflen,
                           enum Encoding encoding) {
  assert(buflen <= node::Buffer::kMaxLength);
  if (!buflen && encoding != BUFFER)
    return New("").ToLocalChecked();

  Local<String> val;
  switch (encoding) {
    case BUFFER:
      return CopyBuffer(buf, buflen).ToLocalChecked();

    case ASCII:
      if (contains_non_ascii(buf, buflen)) {
        char* out = new char[buflen];
        force_ascii(buf, out, buflen);
        val = New<String>(out, buflen).ToLocalChecked();
        delete[] out;
      } else {
        val = New<String>(buf, buflen).ToLocalChecked();
      }
      break;

    case UTF8:
      val = New<String>(buf, buflen).ToLocalChecked();
      break;

    case BINARY: {
      // TODO(isaacs) use ExternalTwoByteString?
      const unsigned char *cbuf = reinterpret_cast<const unsigned char*>(buf);
      uint16_t * twobytebuf = new uint16_t[buflen];
      for (size_t i = 0; i < buflen; i++) {
        // XXX is the following line platform independent?
        twobytebuf[i] = cbuf[i];
      }
      val = New<String>(twobytebuf, buflen).ToLocalChecked();
      delete[] twobytebuf;
      break;
    }

    case BASE64: {
      size_t dlen = base64_encoded_size(buflen);
      char* dst = new char[dlen];

      size_t written = base64_encode(buf, buflen, dst, dlen);
      assert(written == dlen);

      val = New<String>(dst, dlen).ToLocalChecked();
      delete[] dst;
      break;
    }

    case UCS2: {
      const uint16_t* data = reinterpret_cast<const uint16_t*>(buf);
      val = New<String>(data, buflen / 2).ToLocalChecked();
      break;
    }