+++ /dev/null
-//\r
-// © Copyright Henrik Ravn 2004\r
-//\r
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0. \r
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)\r
-//\r
-\r
-using System;\r
-using System.IO;\r
-using System.Runtime.InteropServices;\r
-using System.Text;\r
-\r
-\r
-namespace DotZLib\r
-{\r
-\r
- #region Internal types\r
-\r
- /// <summary>\r
- /// Defines constants for the various flush types used with zlib\r
- /// </summary>\r
- internal enum FlushTypes \r
- {\r
- None, Partial, Sync, Full, Finish, Block\r
- }\r
-\r
- #region ZStream structure\r
- // internal mapping of the zlib zstream structure for marshalling\r
- [StructLayoutAttribute(LayoutKind.Sequential, Pack=4, Size=0, CharSet=CharSet.Ansi)]\r
- internal struct ZStream\r
- {\r
- public IntPtr next_in;\r
- public uint avail_in;\r
- public uint total_in;\r
-\r
- public IntPtr next_out;\r
- public uint avail_out;\r
- public uint total_out;\r
-\r
- [MarshalAs(UnmanagedType.LPStr)]\r
- string msg; \r
- uint state;\r
-\r
- uint zalloc;\r
- uint zfree;\r
- uint opaque;\r
-\r
- int data_type;\r
- public uint adler;\r
- uint reserved;\r
- }\r
-\r
- #endregion\r
- \r
- #endregion\r
-\r
- #region Public enums\r
- /// <summary>\r
- /// Defines constants for the available compression levels in zlib\r
- /// </summary>\r
- public enum CompressLevel : int\r
- {\r
- /// <summary>\r
- /// The default compression level with a reasonable compromise between compression and speed\r
- /// </summary>\r
- Default = -1, \r
- /// <summary>\r
- /// No compression at all. The data are passed straight through.\r
- /// </summary>\r
- None = 0,\r
- /// <summary>\r
- /// The maximum compression rate available.\r
- /// </summary>\r
- Best = 9, \r
- /// <summary>\r
- /// The fastest available compression level.\r
- /// </summary>\r
- Fastest = 1\r
- }\r
- #endregion\r
-\r
- #region Exception classes\r
- /// <summary>\r
- /// The exception that is thrown when an error occurs on the zlib dll\r
- /// </summary>\r
- public class ZLibException : ApplicationException\r
- {\r
- /// <summary>\r
- /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified \r
- /// error message and error code\r
- /// </summary>\r
- /// <param name="errorCode">The zlib error code that caused the exception</param>\r
- /// <param name="msg">A message that (hopefully) describes the error</param>\r
- public ZLibException(int errorCode, string msg) : base(String.Format("ZLib error {0} {1}", errorCode, msg))\r
- {\r
- }\r
-\r
- /// <summary>\r
- /// Initializes a new instance of the <see cref="ZLibException"/> class with a specified \r
- /// error code\r
- /// </summary>\r
- /// <param name="errorCode">The zlib error code that caused the exception</param>\r
- public ZLibException(int errorCode) : base(String.Format("ZLib error {0}", errorCode))\r
- {\r
- }\r
- }\r
- #endregion\r
-\r
- #region Interfaces\r
-\r
- /// <summary>\r
- /// Declares methods and properties that enables a running checksum to be calculated \r
- /// </summary>\r
- public interface ChecksumGenerator\r
- {\r
- /// <summary>\r
- /// Gets the current value of the checksum\r
- /// </summary>\r
- uint Value { get; }\r
-\r
- /// <summary>\r
- /// Clears the current checksum to 0\r
- /// </summary>\r
- void Reset();\r
-\r
- /// <summary>\r
- /// Updates the current checksum with an array of bytes\r
- /// </summary>\r
- /// <param name="data">The data to update the checksum with</param>\r
- void Update(byte[] data);\r
-\r
- /// <summary>\r
- /// Updates the current checksum with part of an array of bytes\r
- /// </summary>\r
- /// <param name="data">The data to update the checksum with</param>\r
- /// <param name="offset">Where in <c>data</c> to start updating</param>\r
- /// <param name="count">The number of bytes from <c>data</c> to use</param>\r
- /// <exception cref="ArgumentException">The sum of offset and count is larger than the length of <c>data</c></exception>\r
- /// <exception cref="ArgumentNullException"><c>data</c> is a null reference</exception>\r
- /// <exception cref="ArgumentOutOfRangeException">Offset or count is negative.</exception>\r
- void Update(byte[] data, int offset, int count);\r
-\r
- /// <summary>\r
- /// Updates the current checksum with the data from a string\r
- /// </summary>\r
- /// <param name="data">The string to update the checksum with</param>\r
- /// <remarks>The characters in the string are converted by the UTF-8 encoding</remarks>\r
- void Update(string data);\r
-\r
- /// <summary>\r
- /// Updates the current checksum with the data from a string, using a specific encoding\r
- /// </summary>\r
- /// <param name="data">The string to update the checksum with</param>\r
- /// <param name="encoding">The encoding to use</param>\r
- void Update(string data, Encoding encoding);\r
- }\r
-\r
-\r
- /// <summary>\r
- /// Represents the method that will be called from a codec when new data\r
- /// are available.\r
- /// </summary>\r
- /// <paramref name="data">The byte array containing the processed data</paramref>\r
- /// <paramref name="startIndex">The index of the first processed byte in <c>data</c></paramref>\r
- /// <paramref name="count">The number of processed bytes available</paramref>\r
- /// <remarks>On return from this method, the data may be overwritten, so grab it while you can. \r
- /// You cannot assume that startIndex will be zero.\r
- /// </remarks>\r
- public delegate void DataAvailableHandler(byte[] data, int startIndex, int count);\r
-\r
- /// <summary>\r
- /// Declares methods and events for implementing compressors/decompressors\r
- /// </summary>\r
- public interface Codec\r
- {\r
- /// <summary>\r
- /// Occurs when more processed data are available.\r
- /// </summary>\r
- event DataAvailableHandler DataAvailable;\r
-\r
- /// <summary>\r
- /// Adds more data to the codec to be processed.\r
- /// </summary>\r
- /// <param name="data">Byte array containing the data to be added to the codec</param>\r
- /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>\r
- void Add(byte[] data);\r
-\r
- /// <summary>\r
- /// Adds more data to the codec to be processed.\r
- /// </summary>\r
- /// <param name="data">Byte array containing the data to be added to the codec</param>\r
- /// <param name="offset">The index of the first byte to add from <c>data</c></param>\r
- /// <param name="count">The number of bytes to add</param>\r
- /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks>\r
- void Add(byte[] data, int offset, int count);\r
-\r
- /// <summary>\r
- /// Finishes up any pending data that needs to be processed and handled.\r
- /// </summary>\r
- void Finish();\r
-\r
- /// <summary>\r
- /// Gets the checksum of the data that has been added so far\r
- /// </summary>\r
- uint Checksum { get; }\r
-\r
-\r
- }\r
-\r
- #endregion\r
-\r
- #region Classes\r
- /// <summary>\r
- /// Encapsulates general information about the ZLib library\r
- /// </summary>\r
- public class Info\r
- {\r
- #region DLL imports\r
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]\r
- private static extern uint zlibCompileFlags();\r
-\r
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]\r
- private static extern string zlibVersion();\r
- #endregion\r
-\r
- #region Private stuff\r
- private uint _flags;\r
-\r
- // helper function that unpacks a bitsize mask\r
- private static int bitSize(uint bits)\r
- {\r
- switch (bits)\r
- {\r
- case 0: return 16;\r
- case 1: return 32;\r
- case 2: return 64;\r
- }\r
- return -1;\r
- }\r
- #endregion\r
-\r
- /// <summary>\r
- /// Constructs an instance of the <c>Info</c> class.\r
- /// </summary>\r
- public Info()\r
- {\r
- _flags = zlibCompileFlags();\r
- }\r
-\r
- /// <summary>\r
- /// True if the library is compiled with debug info\r
- /// </summary>\r
- public bool HasDebugInfo { get { return 0 != (_flags & 0x100); } }\r
-\r
- /// <summary>\r
- /// True if the library is compiled with assembly optimizations\r
- /// </summary>\r
- public bool UsesAssemblyCode { get { return 0 != (_flags & 0x200); } }\r
-\r
- /// <summary>\r
- /// Gets the size of the unsigned int that was compiled into Zlib\r
- /// </summary>\r
- public int SizeOfUInt { get { return bitSize(_flags & 3); } }\r
-\r
- /// <summary>\r
- /// Gets the size of the unsigned long that was compiled into Zlib\r
- /// </summary>\r
- public int SizeOfULong { get { return bitSize((_flags >> 2) & 3); } }\r
-\r
- /// <summary>\r
- /// Gets the size of the pointers that were compiled into Zlib\r
- /// </summary>\r
- public int SizeOfPointer { get { return bitSize((_flags >> 4) & 3); } }\r
-\r
- /// <summary>\r
- /// Gets the size of the z_off_t type that was compiled into Zlib\r
- /// </summary>\r
- public int SizeOfOffset { get { return bitSize((_flags >> 6) & 3); } }\r
-\r
- /// <summary>\r
- /// Gets the version of ZLib as a string, e.g. "1.2.1"\r
- /// </summary>\r
- public static string Version { get { return zlibVersion(); } }\r
- }\r
-\r
- #endregion\r
-\r
-}\r
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