/*

 * Copyright 2001 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 *

 */

#include "Buffer.hpp"

#include <string.h>

Buffer::Buffer(int bufSize) {

  buf = new char[bufSize];

  sz = bufSize;

  fill = 0;

  drain = 0;

}

Buffer::~Buffer() {

  delete[] buf;

}

char*

Buffer::fillPos() {

  return buf + fill;

}

int

Buffer::remaining() {

  return sz - fill;

}

int

Buffer::size() {

  return sz;

}

bool

Buffer::incrFillPos(int amt) {

  if (fill + amt >= sz) {

    return false;

  }

  fill += amt;

  return true;

}

int

Buffer::readByte() {

  if (drain < fill) {

    return buf[drain++] & 0xFF;

  } else {

    return -1;

  }

}

int

Buffer::readBytes(char* data, int len) {

  int numRead = 0;

  while (numRead < len) {

    int c = readByte();

    if (c < 0) break;

    data[numRead++] = (char) c;

  }

  return numRead;

}

char*

Buffer::drainPos() {

  return buf + drain;

}

int

Buffer::drainRemaining() {

  return fill - drain;

}

bool

Buffer::incrDrainPos(int amt) {

  if (drainRemaining() < amt) {

    return false;

  }

  drain += amt;

  return true;

}

void

Buffer::compact() {

  // Copy down data

  memmove(buf, buf + drain, fill - drain);

  // Adjust positions

  fill -= drain;

  drain = 0;

}