/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <log4cxx/logstring.h>

#include <log4cxx/helpers/bytebuffer.h>

#if LOG4CXX_ABI_VERSION <= 15

#include <log4cxx/helpers/exception.h>

#endif

#include <cstring>

using namespace LOG4CXX_NS;

using namespace LOG4CXX_NS::helpers;

struct ByteBuffer::ByteBufferPriv

{

  ByteBufferPriv(char* data1, size_t capacity) :

    base(data1), pos(0), lim(capacity), cap(capacity) {}

  char* base;

  size_t pos;

  size_t lim;

  size_t cap;

};

ByteBuffer::ByteBuffer(char* data1, size_t capacity)

  : m_priv(std::make_unique<ByteBufferPriv>(data1, capacity))

{

}

ByteBuffer::~ByteBuffer()

{

}

void ByteBuffer::clear()

{

  m_priv->lim = m_priv->cap;

  m_priv->pos = 0;

}

void ByteBuffer::carry()

{

  auto available = remaining();

  memmove(m_priv->base, current(), available);

  m_priv->lim = m_priv->cap;

  m_priv->pos = available;

}

void ByteBuffer::flip()

{

  m_priv->lim = m_priv->pos;

  m_priv->pos = 0;

}

#if LOG4CXX_ABI_VERSION <= 15

void ByteBuffer::position(size_t newPosition)

{

  if (newPosition < m_priv->lim)

  {

    m_priv->pos = newPosition;

  }

  else

  {

    m_priv->pos = m_priv->lim;

  }

}

void ByteBuffer::limit(size_t newLimit)

{

  if (newLimit > m_priv->cap)

  {

    throw IllegalArgumentException(LOG4CXX_STR("newLimit"));

  }

  m_priv->lim = newLimit;

  if (m_priv->pos > m_priv->lim)

  {

    m_priv->pos = m_priv->lim;

  }

}

#endif

bool ByteBuffer::put(char byte)

{

  if (m_priv->pos < m_priv->lim)

  {

    m_priv->base[m_priv->pos++] = byte;

    return true;

  }

  return false;

}

char* ByteBuffer::data()

{

  return m_priv->base;

}

const char* ByteBuffer::data() const

{

  return m_priv->base;

}

char* ByteBuffer::current()

{

  return m_priv->base + m_priv->pos;

}

const char* ByteBuffer::current() const

{

  return m_priv->base + m_priv->pos;

}

size_t ByteBuffer::limit() const

{

  return m_priv->lim;

}

size_t ByteBuffer::position() const

{

  return m_priv->pos;

}

size_t ByteBuffer::remaining() const

{

  return m_priv->lim - m_priv->pos;

}

size_t ByteBuffer::increment_position(size_t byteCount)

{

    auto available = remaining();

    m_priv->pos += byteCount < available ? byteCount : available;

    return remaining();

}