diff options
Diffstat (limited to 'deps/zlib/contrib/dotzlib/DotZLib/CodecBase.cs')
| -rw-r--r-- | deps/zlib/contrib/dotzlib/DotZLib/CodecBase.cs | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/deps/zlib/contrib/dotzlib/DotZLib/CodecBase.cs b/deps/zlib/contrib/dotzlib/DotZLib/CodecBase.cs deleted file mode 100644 index b0eb78a022..0000000000 --- a/deps/zlib/contrib/dotzlib/DotZLib/CodecBase.cs +++ /dev/null @@ -1,198 +0,0 @@ -// -// © Copyright Henrik Ravn 2004 -// -// Use, modification and distribution are subject to the Boost Software License, Version 1.0. -// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -// - -using System; -using System.Runtime.InteropServices; - -namespace DotZLib -{ - /// <summary> - /// Implements the common functionality needed for all <see cref="Codec"/>s - /// </summary> - public abstract class CodecBase : Codec, IDisposable - { - - #region Data members - - /// <summary> - /// Instance of the internal zlib buffer structure that is - /// passed to all functions in the zlib dll - /// </summary> - internal ZStream _ztream = new ZStream(); - - /// <summary> - /// True if the object instance has been disposed, false otherwise - /// </summary> - protected bool _isDisposed = false; - - /// <summary> - /// The size of the internal buffers - /// </summary> - protected const int kBufferSize = 16384; - - private byte[] _outBuffer = new byte[kBufferSize]; - private byte[] _inBuffer = new byte[kBufferSize]; - - private GCHandle _hInput; - private GCHandle _hOutput; - - private uint _checksum = 0; - - #endregion - - /// <summary> - /// Initializes a new instance of the <c>CodeBase</c> class. - /// </summary> - public CodecBase() - { - try - { - _hInput = GCHandle.Alloc(_inBuffer, GCHandleType.Pinned); - _hOutput = GCHandle.Alloc(_outBuffer, GCHandleType.Pinned); - } - catch (Exception) - { - CleanUp(false); - throw; - } - } - - - #region Codec Members - - /// <summary> - /// Occurs when more processed data are available. - /// </summary> - public event DataAvailableHandler DataAvailable; - - /// <summary> - /// Fires the <see cref="DataAvailable"/> event - /// </summary> - protected void OnDataAvailable() - { - if (_ztream.total_out > 0) - { - if (DataAvailable != null) - DataAvailable( _outBuffer, 0, (int)_ztream.total_out); - resetOutput(); - } - } - - /// <summary> - /// Adds more data to the codec to be processed. - /// </summary> - /// <param name="data">Byte array containing the data to be added to the codec</param> - /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks> - public void Add(byte[] data) - { - Add(data,0,data.Length); - } - - /// <summary> - /// Adds more data to the codec to be processed. - /// </summary> - /// <param name="data">Byte array containing the data to be added to the codec</param> - /// <param name="offset">The index of the first byte to add from <c>data</c></param> - /// <param name="count">The number of bytes to add</param> - /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks> - /// <remarks>This must be implemented by a derived class</remarks> - public abstract void Add(byte[] data, int offset, int count); - - /// <summary> - /// Finishes up any pending data that needs to be processed and handled. - /// </summary> - /// <remarks>This must be implemented by a derived class</remarks> - public abstract void Finish(); - - /// <summary> - /// Gets the checksum of the data that has been added so far - /// </summary> - public uint Checksum { get { return _checksum; } } - - #endregion - - #region Destructor & IDisposable stuff - - /// <summary> - /// Destroys this instance - /// </summary> - ~CodecBase() - { - CleanUp(false); - } - - /// <summary> - /// Releases any unmanaged resources and calls the <see cref="CleanUp()"/> method of the derived class - /// </summary> - public void Dispose() - { - CleanUp(true); - } - - /// <summary> - /// Performs any codec specific cleanup - /// </summary> - /// <remarks>This must be implemented by a derived class</remarks> - protected abstract void CleanUp(); - - // performs the release of the handles and calls the dereived CleanUp() - private void CleanUp(bool isDisposing) - { - if (!_isDisposed) - { - CleanUp(); - if (_hInput.IsAllocated) - _hInput.Free(); - if (_hOutput.IsAllocated) - _hOutput.Free(); - - _isDisposed = true; - } - } - - - #endregion - - #region Helper methods - - /// <summary> - /// Copies a number of bytes to the internal codec buffer - ready for proccesing - /// </summary> - /// <param name="data">The byte array that contains the data to copy</param> - /// <param name="startIndex">The index of the first byte to copy</param> - /// <param name="count">The number of bytes to copy from <c>data</c></param> - protected void copyInput(byte[] data, int startIndex, int count) - { - Array.Copy(data, startIndex, _inBuffer,0, count); - _ztream.next_in = _hInput.AddrOfPinnedObject(); - _ztream.total_in = 0; - _ztream.avail_in = (uint)count; - - } - - /// <summary> - /// Resets the internal output buffers to a known state - ready for processing - /// </summary> - protected void resetOutput() - { - _ztream.total_out = 0; - _ztream.avail_out = kBufferSize; - _ztream.next_out = _hOutput.AddrOfPinnedObject(); - } - - /// <summary> - /// Updates the running checksum property - /// </summary> - /// <param name="newSum">The new checksum value</param> - protected void setChecksum(uint newSum) - { - _checksum = newSum; - } - #endregion - - } -} |