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diff --git a/src/external/zlib-1.2.8/contrib/dotzlib/DotZLib/ChecksumImpl.cs b/src/external/zlib-1.2.8/contrib/dotzlib/DotZLib/ChecksumImpl.cs
deleted file mode 100644
index 788b2fc..0000000
--- a/src/external/zlib-1.2.8/contrib/dotzlib/DotZLib/ChecksumImpl.cs
+++ /dev/null
@@ -1,202 +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;
-using System.Text;
-
-
-namespace DotZLib
-{
- #region ChecksumGeneratorBase
- ///
- /// Implements the common functionality needed for all s
- ///
- ///
- public abstract class ChecksumGeneratorBase : ChecksumGenerator
- {
- ///
- /// The value of the current checksum
- ///
- protected uint _current;
-
- ///
- /// Initializes a new instance of the checksum generator base - the current checksum is
- /// set to zero
- ///
- public ChecksumGeneratorBase()
- {
- _current = 0;
- }
-
- ///
- /// Initializes a new instance of the checksum generator basewith a specified value
- ///
- /// The value to set the current checksum to
- public ChecksumGeneratorBase(uint initialValue)
- {
- _current = initialValue;
- }
-
- ///
- /// Resets the current checksum to zero
- ///
- public void Reset() { _current = 0; }
-
- ///
- /// Gets the current checksum value
- ///
- public uint Value { get { return _current; } }
-
- ///
- /// Updates the current checksum with part of an array of bytes
- ///
- /// The data to update the checksum with
- /// Where in data to start updating
- /// The number of bytes from data to use
- /// The sum of offset and count is larger than the length of data
- /// data is a null reference
- /// Offset or count is negative.
- /// All the other Update methods are implmeneted in terms of this one.
- /// This is therefore the only method a derived class has to implement
- public abstract void Update(byte[] data, int offset, int count);
-
- ///
- /// Updates the current checksum with an array of bytes.
- ///
- /// The data to update the checksum with
- public void Update(byte[] data)
- {
- Update(data, 0, data.Length);
- }
-
- ///
- /// Updates the current checksum with the data from a string
- ///
- /// The string to update the checksum with
- /// The characters in the string are converted by the UTF-8 encoding
- public void Update(string data)
- {
- Update(Encoding.UTF8.GetBytes(data));
- }
-
- ///
- /// Updates the current checksum with the data from a string, using a specific encoding
- ///
- /// The string to update the checksum with
- /// The encoding to use
- public void Update(string data, Encoding encoding)
- {
- Update(encoding.GetBytes(data));
- }
-
- }
- #endregion
-
- #region CRC32
- ///
- /// Implements a CRC32 checksum generator
- ///
- public sealed class CRC32Checksum : ChecksumGeneratorBase
- {
- #region DLL imports
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern uint crc32(uint crc, int data, uint length);
-
- #endregion
-
- ///
- /// Initializes a new instance of the CRC32 checksum generator
- ///
- public CRC32Checksum() : base() {}
-
- ///
- /// Initializes a new instance of the CRC32 checksum generator with a specified value
- ///
- /// The value to set the current checksum to
- public CRC32Checksum(uint initialValue) : base(initialValue) {}
-
- ///
- /// Updates the current checksum with part of an array of bytes
- ///
- /// The data to update the checksum with
- /// Where in data to start updating
- /// The number of bytes from data to use
- /// The sum of offset and count is larger than the length of data
- /// data is a null reference
- /// Offset or count is negative.
- public override void Update(byte[] data, int offset, int count)
- {
- if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
- if ((offset+count) > data.Length) throw new ArgumentException();
- GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
- try
- {
- _current = crc32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
- }
- finally
- {
- hData.Free();
- }
- }
-
- }
- #endregion
-
- #region Adler
- ///
- /// Implements a checksum generator that computes the Adler checksum on data
- ///
- public sealed class AdlerChecksum : ChecksumGeneratorBase
- {
- #region DLL imports
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern uint adler32(uint adler, int data, uint length);
-
- #endregion
-
- ///
- /// Initializes a new instance of the Adler checksum generator
- ///
- public AdlerChecksum() : base() {}
-
- ///
- /// Initializes a new instance of the Adler checksum generator with a specified value
- ///
- /// The value to set the current checksum to
- public AdlerChecksum(uint initialValue) : base(initialValue) {}
-
- ///
- /// Updates the current checksum with part of an array of bytes
- ///
- /// The data to update the checksum with
- /// Where in data to start updating
- /// The number of bytes from data to use
- /// The sum of offset and count is larger than the length of data
- /// data is a null reference
- /// Offset or count is negative.
- public override void Update(byte[] data, int offset, int count)
- {
- if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
- if ((offset+count) > data.Length) throw new ArgumentException();
- GCHandle hData = GCHandle.Alloc(data, GCHandleType.Pinned);
- try
- {
- _current = adler32(_current, hData.AddrOfPinnedObject().ToInt32()+offset, (uint)count);
- }
- finally
- {
- hData.Free();
- }
- }
-
- }
- #endregion
-
-}
\ No newline at end of file