mirror of
https://git.do.srb2.org/STJr/SRB2.git
synced 2024-11-18 18:41:57 +00:00
105 lines
3.7 KiB
C#
105 lines
3.7 KiB
C#
//
|
|
// © 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.Diagnostics;
|
|
using System.Runtime.InteropServices;
|
|
|
|
namespace DotZLib
|
|
{
|
|
|
|
/// <summary>
|
|
/// Implements a data decompressor, using the inflate algorithm in the ZLib dll
|
|
/// </summary>
|
|
public class Inflater : CodecBase
|
|
{
|
|
#region Dll imports
|
|
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
|
|
private static extern int inflateInit_(ref ZStream sz, string vs, int size);
|
|
|
|
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
|
|
private static extern int inflate(ref ZStream sz, int flush);
|
|
|
|
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
|
|
private static extern int inflateReset(ref ZStream sz);
|
|
|
|
[DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
|
|
private static extern int inflateEnd(ref ZStream sz);
|
|
#endregion
|
|
|
|
/// <summary>
|
|
/// Constructs an new instance of the <c>Inflater</c>
|
|
/// </summary>
|
|
public Inflater() : base()
|
|
{
|
|
int retval = inflateInit_(ref _ztream, Info.Version, Marshal.SizeOf(_ztream));
|
|
if (retval != 0)
|
|
throw new ZLibException(retval, "Could not initialize inflater");
|
|
|
|
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>
|
|
/// <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>
|
|
public override void Add(byte[] data, int offset, int count)
|
|
{
|
|
if (data == null) throw new ArgumentNullException();
|
|
if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
|
|
if ((offset+count) > data.Length) throw new ArgumentException();
|
|
|
|
int total = count;
|
|
int inputIndex = offset;
|
|
int err = 0;
|
|
|
|
while (err >= 0 && inputIndex < total)
|
|
{
|
|
copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize));
|
|
err = inflate(ref _ztream, (int)FlushTypes.None);
|
|
if (err == 0)
|
|
while (_ztream.avail_out == 0)
|
|
{
|
|
OnDataAvailable();
|
|
err = inflate(ref _ztream, (int)FlushTypes.None);
|
|
}
|
|
|
|
inputIndex += (int)_ztream.total_in;
|
|
}
|
|
setChecksum( _ztream.adler );
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// Finishes up any pending data that needs to be processed and handled.
|
|
/// </summary>
|
|
public override void Finish()
|
|
{
|
|
int err;
|
|
do
|
|
{
|
|
err = inflate(ref _ztream, (int)FlushTypes.Finish);
|
|
OnDataAvailable();
|
|
}
|
|
while (err == 0);
|
|
setChecksum( _ztream.adler );
|
|
inflateReset(ref _ztream);
|
|
resetOutput();
|
|
}
|
|
|
|
/// <summary>
|
|
/// Closes the internal zlib inflate stream
|
|
/// </summary>
|
|
protected override void CleanUp() { inflateEnd(ref _ztream); }
|
|
|
|
|
|
}
|
|
}
|