b.n = 0
	return nil
}

// Available returns how many bytes are unused in the buffer.
func (b *Writer) Available() int { return len(b.buf) - b.n }

// AvailableBuffer returns an empty buffer with b.Available() capacity.
// This buffer is intended to be appended to and
// passed to an immediately succeeding [Writer.Write] call.
// The buffer is only valid until the next write operation on b.
func (b *Writer) AvailableBuffer() []byte {

                _src.dec_ndr_long();
                int _bufferl = _src.dec_ndr_long();
                int _bufferi = _src.index;
                _src.advance(2 * _bufferl);

                if ( this.buffer == null ) {
                    if ( _buffers < 0 || _buffers > 0xFFFF )
                        throw new NdrException(NdrException.INVALID_CONFORMANCE);

  private fun sourceReader(source: Source?): Callable<ByteString> {
    return Callable {
      val buffer = Buffer()
      while (source!!.read(buffer, 16384) != -1L) {
      }
      source.close()
      buffer.readByteString()
    }
  }

  private fun assertFile(
    prefix: ByteString,
    upstreamSize: Long,
    metadataSize: Int,

    int initialBufferSize = min(BUFFER_SIZE, max(128, Integer.highestOneBit(totalLen) * 2));
    // Starting with an 8k buffer, double the size of each successive buffer. Smaller buffers
    // quadruple in size until they reach 8k, to minimize the number of small reads for longer
    // streams. Buffers are retained in a deque so that there's no copying between buffers while

            e.name = readString( buffer, bufferIndex, 16, false );
            bufferIndex += 16;
            e.versionMajor = (int)( buffer[bufferIndex++] & 0xFF );
            e.versionMinor = (int)( buffer[bufferIndex++] & 0xFF );
            e.type = readInt4( buffer, bufferIndex );
            bufferIndex += 4;
            int off = readInt4( buffer, bufferIndex );
            bufferIndex += 4;

    val buffer = Buffer()
    buffer.write(byteString)
    deflate(buffer)
    return buffer.readByteString()
  }

  private fun MessageInflater.inflate(byteString: ByteString): ByteString {
    val buffer = Buffer()
    buffer.write(byteString)
    inflate(buffer)
    return buffer.readByteString()
  }

import okhttp3.logging.internal.isProbablyUtf8
import okio.Buffer
import org.junit.jupiter.api.Test

class IsProbablyUtf8Test {
  @Test fun isProbablyUtf8() {
    assertThat(Buffer().isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("abc").isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("new\r\nlines").isProbablyUtf8()).isTrue()
    assertThat(Buffer().writeUtf8("white\t space").isProbablyUtf8()).isTrue()

        val read = delegate.read(buffer, byteCount)
        if (read != -1L) {
          sink.write(buffer.readByteString().toAsciiUppercase())
        }
        return read
      }
    }
  }

  private static final byte[] testBytes = new byte[] {'y', 'a', 'm', 's'};
  private ByteArrayInputStream buffer;

  @SuppressWarnings("DoNotMock")
  @Override
  protected void setUp() throws Exception {
    super.setUp();
    hasher = mock(Hasher.class);
    hashFunction = mock(HashFunction.class);
    buffer = new ByteArrayInputStream(testBytes);

    when(hashFunction.newHasher()).thenReturn(hasher);
  }

        boundary = "simple boundary",
        source = Buffer().writeUtf8(multipart),
      )

    assertThat(parts.nextPart()).isNotNull()
    assertThat(parts.nextPart()).isNull()
    assertThat(parts.nextPart()).isNull()
  }

  @Test fun `empty source`() {
    val parts =
      MultipartReader(
        boundary = "simple boundary",
        source = Buffer(),
      )

    assertFailsWith<EOFException> {