19e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project// 29e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project// � Copyright Henrik Ravn 2004 39e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project// 4381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes// Use, modification and distribution are subject to the Boost Software License, Version 1.0. 59e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 69e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project// 79e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 89e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectusing System; 99e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectusing System.Diagnostics; 109e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectusing System.Runtime.InteropServices; 119e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 129e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Projectnamespace DotZLib 139e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project{ 149e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 159e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <summary> 169e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// Implements a data compressor, using the deflate algorithm in the ZLib dll 179e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// </summary> 189e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project public sealed class Deflater : CodecBase 199e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 209e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project #region Dll imports 219e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)] 229e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project private static extern int deflateInit_(ref ZStream sz, int level, string vs, int size); 239e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 249e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)] 259e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project private static extern int deflate(ref ZStream sz, int flush); 269e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 279e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)] 289e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project private static extern int deflateReset(ref ZStream sz); 299e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 309e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)] 319e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project private static extern int deflateEnd(ref ZStream sz); 329e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project #endregion 339e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 349e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <summary> 359e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// Constructs an new instance of the <c>Deflater</c> 369e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// </summary> 379e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <param name="level">The compression level to use for this <c>Deflater</c></param> 389e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project public Deflater(CompressLevel level) : base() 399e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 409e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int retval = deflateInit_(ref _ztream, (int)level, Info.Version, Marshal.SizeOf(_ztream)); 419e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (retval != 0) 429e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project throw new ZLibException(retval, "Could not initialize deflater"); 439e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 449e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project resetOutput(); 459e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 469e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 479e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <summary> 489e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// Adds more data to the codec to be processed. 499e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// </summary> 509e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <param name="data">Byte array containing the data to be added to the codec</param> 519e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <param name="offset">The index of the first byte to add from <c>data</c></param> 529e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <param name="count">The number of bytes to add</param> 539e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <remarks>Adding data may, or may not, raise the <c>DataAvailable</c> event</remarks> 549e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project public override void Add(byte[] data, int offset, int count) 559e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 569e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (data == null) throw new ArgumentNullException(); 579e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException(); 589e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if ((offset+count) > data.Length) throw new ArgumentException(); 59381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes 609e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int total = count; 619e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int inputIndex = offset; 629e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int err = 0; 639e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 649e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (err >= 0 && inputIndex < total) 659e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 669e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project copyInput(data, inputIndex, Math.Min(total - inputIndex, kBufferSize)); 679e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (err >= 0 && _ztream.avail_in > 0) 689e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 699e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project err = deflate(ref _ztream, (int)FlushTypes.None); 709e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project if (err == 0) 719e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (_ztream.avail_out == 0) 729e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 739e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project OnDataAvailable(); 749e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project err = deflate(ref _ztream, (int)FlushTypes.None); 759e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 769e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project inputIndex += (int)_ztream.total_in; 779e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 789e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 799e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project setChecksum( _ztream.adler ); 809e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 819e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 829e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 839e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <summary> 849e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// Finishes up any pending data that needs to be processed and handled. 859e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// </summary> 869e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project public override void Finish() 879e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 889e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project int err; 89381716e9396b55b1adb8235b020c37344f60ab07Elliott Hughes do 909e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project { 919e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project err = deflate(ref _ztream, (int)FlushTypes.Finish); 929e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project OnDataAvailable(); 939e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 949e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project while (err == 0); 959e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project setChecksum( _ztream.adler ); 969e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project deflateReset(ref _ztream); 979e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project resetOutput(); 989e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 999e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1009e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// <summary> 1019e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// Closes the internal zlib deflate stream 1029e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project /// </summary> 1039e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project protected override void CleanUp() { deflateEnd(ref _ztream); } 1049e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project 1059e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project } 1069e38dfa2f95fce609707a0941f10af9a785288deThe Android Open Source Project} 107