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1 files changed, 202 insertions, 0 deletions

diff --git a/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs b/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
new file mode 100644
index 000000000..dfe7e90a8
--- /dev/null
+++ b/zlib/contrib/dotzlib/DotZLib/ChecksumImpl.cs
@@ -0,0 +1,202 @@
+//

+// © 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

+    /// <summary>

+    /// Implements the common functionality needed for all <see cref="ChecksumGenerator"/>s

+    /// </summary>

+    /// <example></example>

+    public abstract class ChecksumGeneratorBase : ChecksumGenerator

+    {

+        /// <summary>

+        /// The value of the current checksum

+        /// </summary>

+        protected uint _current;

+

+        /// <summary>

+        /// Initializes a new instance of the checksum generator base - the current checksum is 

+        /// set to zero

+        /// </summary>

+        public ChecksumGeneratorBase()

+        {

+            _current = 0;

+        }

+

+        /// <summary>

+        /// Initializes a new instance of the checksum generator basewith a specified value

+        /// </summary>

+        /// <param name="initialValue">The value to set the current checksum to</param>

+        public ChecksumGeneratorBase(uint initialValue)

+        {

+            _current = initialValue;

+        }

+

+        /// <summary>

+        /// Resets the current checksum to zero

+        /// </summary>

+        public void Reset() { _current = 0; }

+

+        /// <summary>

+        /// Gets the current checksum value

+        /// </summary>

+        public uint Value { get { return _current; } }

+

+        /// <summary>

+        /// Updates the current checksum with part of an array of bytes

+        /// </summary>

+        /// <param name="data">The data to update the checksum with</param>

+        /// <param name="offset">Where in <c>data</c> to start updating</param>

+        /// <param name="count">The number of bytes from <c>data</c> to use</param>

+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>

+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>

+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>

+        /// <remarks>All the other <c>Update</c> methods are implmeneted in terms of this one. 

+        /// This is therefore the only method a derived class has to implement</remarks>

+        public abstract void Update(byte[] data, int offset, int count);

+

+        /// <summary>

+        /// Updates the current checksum with an array of bytes.

+        /// </summary>

+        /// <param name="data">The data to update the checksum with</param>

+        public void Update(byte[] data)

+        {

+            Update(data, 0, data.Length);

+        }

+

+        /// <summary>

+        /// Updates the current checksum with the data from a string

+        /// </summary>

+        /// <param name="data">The string to update the checksum with</param>

+        /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>

+        public void Update(string data)

+        {

+			Update(Encoding.UTF8.GetBytes(data));

+        }

+

+        /// <summary>

+        /// Updates the current checksum with the data from a string, using a specific encoding

+        /// </summary>

+        /// <param name="data">The string to update the checksum with</param>

+        /// <param name="encoding">The encoding to use</param>

+        public void Update(string data, Encoding encoding)

+        {

+            Update(encoding.GetBytes(data));

+        }

+

+    }

+    #endregion

+

+    #region CRC32

+    /// <summary>

+    /// Implements a CRC32 checksum generator

+    /// </summary>

+    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

+

+        /// <summary>

+        /// Initializes a new instance of the CRC32 checksum generator

+        /// </summary>

+        public CRC32Checksum() : base() {}

+

+        /// <summary>

+        /// Initializes a new instance of the CRC32 checksum generator with a specified value

+        /// </summary>

+        /// <param name="initialValue">The value to set the current checksum to</param>

+        public CRC32Checksum(uint initialValue) : base(initialValue) {}

+

+        /// <summary>

+        /// Updates the current checksum with part of an array of bytes

+        /// </summary>

+        /// <param name="data">The data to update the checksum with</param>

+        /// <param name="offset">Where in <c>data</c> to start updating</param>

+        /// <param name="count">The number of bytes from <c>data</c> to use</param>

+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>

+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>

+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>

+        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

+    /// <summary>

+    /// Implements a checksum generator that computes the Adler checksum on data

+    /// </summary>

+    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

+

+        /// <summary>

+        /// Initializes a new instance of the Adler checksum generator

+        /// </summary>

+        public AdlerChecksum() : base() {}

+

+        /// <summary>

+        /// Initializes a new instance of the Adler checksum generator with a specified value

+        /// </summary>

+        /// <param name="initialValue">The value to set the current checksum to</param>

+        public AdlerChecksum(uint initialValue) : base(initialValue) {}

+

+        /// <summary>

+        /// Updates the current checksum with part of an array of bytes

+        /// </summary>

+        /// <param name="data">The data to update the checksum with</param>

+        /// <param name="offset">Where in <c>data</c> to start updating</param>

+        /// <param name="count">The number of bytes from <c>data</c> to use</param>

+        /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>

+        /// <exception cref="NullReferenceException"><c>data</c> is a null reference</exception>

+        /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>

+        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