Move zlib to top-level root.

[samba.git] / lib / zlib / contrib / dotzlib / DotZLib / Deflater.cs

diff --git a/lib/zlib/contrib/dotzlib/DotZLib/Deflater.cs b/lib/zlib/contrib/dotzlib/DotZLib/Deflater.cs
new file mode 100644 (file)
index 0000000..d7b8dcc
--- /dev/null
+++ b/lib/zlib/contrib/dotzlib/DotZLib/Deflater.cs
@@ -0,0 +1,106 @@
+//\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 compressor, using the deflate algorithm in the ZLib dll\r
+    /// </summary>\r
+       public sealed class Deflater : CodecBase\r
+       {\r
+        #region Dll imports\r
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]\r
+        private static extern int deflateInit_(ref ZStream sz, int level, string vs, int size);\r
+\r
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]\r
+        private static extern int deflate(ref ZStream sz, int flush);\r
+\r
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]\r
+        private static extern int deflateReset(ref ZStream sz);\r
+\r
+        [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]\r
+        private static extern int deflateEnd(ref ZStream sz);\r
+        #endregion\r
+\r
+        /// <summary>\r
+        /// Constructs an new instance of the <c>Deflater</c>\r
+        /// </summary>\r
+        /// <param name="level">The compression level to use for this <c>Deflater</c></param>\r
+               public Deflater(CompressLevel level) : base()\r
+               {\r
+            int retval = deflateInit_(ref _ztream, (int)level, Info.Version, Marshal.SizeOf(_ztream));\r
+            if (retval != 0)\r
+                throw new ZLibException(retval, "Could not initialize deflater");\r
+\r
+            resetOutput();\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
+                while (err >= 0 && _ztream.avail_in > 0)\r
+                {\r
+                    err = deflate(ref _ztream, (int)FlushTypes.None);\r
+                    if (err == 0)\r
+                        while (_ztream.avail_out == 0)\r
+                        {\r
+                            OnDataAvailable();\r
+                            err = deflate(ref _ztream, (int)FlushTypes.None);\r
+                        }\r
+                    inputIndex += (int)_ztream.total_in;\r
+                }\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 = deflate(ref _ztream, (int)FlushTypes.Finish);\r
+                OnDataAvailable();\r
+            }\r
+            while (err == 0);\r
+            setChecksum( _ztream.adler );\r
+            deflateReset(ref _ztream);\r
+            resetOutput();\r
+        }\r
+\r
+        /// <summary>\r
+        /// Closes the internal zlib deflate stream\r
+        /// </summary>\r
+        protected override void CleanUp() { deflateEnd(ref _ztream); }\r
+\r
+    }\r
+}\r