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