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