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Viewing changes to examples/zlibwrap/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs

  • Committer: Package Import Robot
  • Author(s): Andrew Shadura
  • Date: 2013-05-11 00:08:06 UTC
  • Revision ID: package-import@ubuntu.com-20130511000806-7hq1zc3fnn0gat79
Tags: upstream-3.1.9
Import upstream version 3.1.9

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examples/zlibwrap/zlib/contrib/dotzlib/DotZLib/CircularBuffer.cs
 
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//
 
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// � Copyright Henrik Ravn 2004
 
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//
 
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// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
 
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// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
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//
 
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using System;
 
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using System.Diagnostics;
 
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namespace DotZLib
 
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{
 
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        /// <summary>
 
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        /// This class implements a circular buffer
 
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        /// </summary>
 
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        internal class CircularBuffer
 
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        {
 
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        #region Private data
 
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        private int _capacity;
 
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        private int _head;
 
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        private int _tail;
 
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        private int _size;
 
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        private byte[] _buffer;
 
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        #endregion
 
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        public CircularBuffer(int capacity)
 
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        {
 
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            Debug.Assert( capacity > 0 );
 
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            _buffer = new byte[capacity];
 
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            _capacity = capacity;
 
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            _head = 0;
 
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            _tail = 0;
 
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            _size = 0;
 
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        }
 
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        public int Size { get { return _size; } }
 
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        public int Put(byte[] source, int offset, int count)
 
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        {
 
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            Debug.Assert( count > 0 );
 
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            int trueCount = Math.Min(count, _capacity - Size);
 
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            for (int i = 0; i < trueCount; ++i)
 
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                _buffer[(_tail+i) % _capacity] = source[offset+i];
 
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            _tail += trueCount;
 
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            _tail %= _capacity;
 
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            _size += trueCount;
 
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            return trueCount;
 
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        }
 
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        public bool Put(byte b)
 
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        {
 
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            if (Size == _capacity) // no room
 
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                return false;
 
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            _buffer[_tail++] = b;
 
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            _tail %= _capacity;
 
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            ++_size;
 
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            return true;
 
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        }
 
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        public int Get(byte[] destination, int offset, int count)
 
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        {
 
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            int trueCount = Math.Min(count,Size);
 
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            for (int i = 0; i < trueCount; ++i)
 
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                destination[offset + i] = _buffer[(_head+i) % _capacity];
 
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            _head += trueCount;
 
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            _head %= _capacity;
 
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            _size -= trueCount;
 
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            return trueCount;
 
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        }
 
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        public int Get()
 
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        {
 
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            if (Size == 0)
 
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                return -1;
 
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            int result = (int)_buffer[_head++ % _capacity];
 
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            --_size;
 
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            return result;
 
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        }
 
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    }
 
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}