How to use

ensureBytes

method

in

org.postgresql.core.VisibleBufferedInputStream

/**
 * Reads a byte from the buffer without advancing the index pointer.
 *
 * @return byte from the buffer without advancing the index pointer
 * @throws IOException if something wrong happens
 */
public int peek() throws IOException {
 if (ensureBytes(1)) {
  return buffer[index] & 0xFF;
 }
 return -1;
}

/**
 * Reads a byte from the buffer without advancing the index pointer.
 */
public int peek() throws IOException {
  if (ensureBytes(1)) {
    return buffer[index] & 0xFF;
  }
  return -1;
}

/**
 * {@inheritDoc}
 */
public int read() throws IOException {
 if (ensureBytes(1)) {
  return buffer[index++] & 0xFF;
 }
 return -1;
}

/**
 * {@inheritDoc}
 */
public int read() throws IOException {
  if (ensureBytes(1)) {
    return buffer[index++] & 0xFF;
  }
  return -1;
}

ensureBytes(len);
avail = endIndex - index;

ensureBytes(len);
avail = endIndex - index;

/**
 * Receives a fixed-size string from the backend.
 *
 * @param len the length of the string to receive, in bytes.
 * @return the decoded string
 * @throws IOException if something wrong happens
 */
public String receiveString(int len) throws IOException {
 if (!pg_input.ensureBytes(len)) {
  throw new EOFException();
 }
 String res = encoding.decode(pg_input.getBuffer(), pg_input.getIndex(), len);
 pg_input.skip(len);
 return res;
}

/**
 * Receives a fixed-size string from the backend.
 *
 * @param len the length of the string to receive, in bytes.
 * @return the decoded string
 */
public String ReceiveString(int len) throws IOException {
  if (!pg_input.ensureBytes(len)) {
    throw new EOFException();
  }
  String res = encoding.decode(pg_input.getBuffer(), pg_input.getIndex(),
                 len);
  pg_input.skip(len);
  return res;
}

/**
 * Receives a fixed-size string from the backend, and tries to avoid "UTF-8 decode failed"
 * errors.
 *
 * @param len the length of the string to receive, in bytes.
 * @return the decoded string
 * @throws IOException if something wrong happens
 */
public EncodingPredictor.DecodeResult receiveErrorString(int len) throws IOException {
 if (!pg_input.ensureBytes(len)) {
  throw new EOFException();
 }
 EncodingPredictor.DecodeResult res;
 try {
  String value = encoding.decode(pg_input.getBuffer(), pg_input.getIndex(), len);
  // no autodetect warning as the message was converted on its own
  res = new EncodingPredictor.DecodeResult(value, null);
 } catch (IOException e) {
  res = EncodingPredictor.decode(pg_input.getBuffer(), pg_input.getIndex(), len);
  if (res == null) {
   Encoding enc = Encoding.defaultEncoding();
   String value = enc.decode(pg_input.getBuffer(), pg_input.getIndex(), len);
   res = new EncodingPredictor.DecodeResult(value, enc.name());
  }
 }
 pg_input.skip(len);
 return res;
}

/**
 * Reads a byte from the buffer without advancing the index pointer.
 */
public int peek() throws IOException {
  if (ensureBytes(1)) {
    return buffer[index] & 0xFF;
  }
  return -1;
}

/**
 * {@inheritDoc}
 */
public int read() throws IOException {
  if (ensureBytes(1)) {
    return buffer[index++] & 0xFF;
  }
  return -1;
}

/**
 * {@inheritDoc}
 */
public int read() throws IOException {
  if (ensureBytes(1)) {
    return buffer[index++] & 0xFF;
  }
  return -1;
}

ensureBytes(len);
avail = endIndex - index;

ensureBytes(len);
avail = endIndex - index;

/**
 * Receives a fixed-size string from the backend.
 *
 * @param len the length of the string to receive, in bytes.
 * @return the decoded string
 */
public String ReceiveString(int len) throws IOException {
  if (!pg_input.ensureBytes(len)) {
    throw new EOFException();
  }
  String res = encoding.decode(pg_input.getBuffer(), pg_input.getIndex(),
                 len);
  pg_input.skip(len);
  return res;
}

/**
 * Receives a fixed-size string from the backend.
 *
 * @param len the length of the string to receive, in bytes.
 * @return the decoded string
 */
public String ReceiveString(int len) throws IOException {
  if (!pg_input.ensureBytes(len)) {
    throw new EOFException();
  }
  String res = encoding.decode(pg_input.getBuffer(), pg_input.getIndex(),
                 len);
  pg_input.skip(len);
  return res;
}