663 lines
18 KiB
C#
663 lines
18 KiB
C#
/* -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
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//
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// DeflateStream.cs
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//
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// Authors:
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// Christopher James Lahey <clahey@ximian.com>
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// Gonzalo Paniagua Javier (gonzalo@novell.com)
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// Marek Safar (marek.safar@gmail.com)
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//
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// (c) Copyright 2004,2009 Novell, Inc. <http://www.novell.com>
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// Copyright (C) 2013 Xamarin Inc (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.IO;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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using System.Runtime.Remoting.Messaging;
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using System.Threading;
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using System.Threading.Tasks;
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namespace System.IO.Compression
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{
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public class DeflateStream : Stream
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{
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delegate int ReadMethod (byte[] array, int offset, int count);
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delegate void WriteMethod (byte[] array, int offset, int count);
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Stream base_stream;
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CompressionMode mode;
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bool leaveOpen;
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bool disposed;
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DeflateStreamNative native;
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public DeflateStream (Stream stream, CompressionMode mode) :
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this (stream, mode, false, false)
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{
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}
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public DeflateStream (Stream stream, CompressionMode mode, bool leaveOpen) :
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this (stream, mode, leaveOpen, false)
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{
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}
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internal DeflateStream (Stream stream, CompressionMode mode, bool leaveOpen, int windowsBits) :
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this (stream, mode, leaveOpen, true)
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{
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}
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internal DeflateStream (Stream compressedStream, CompressionMode mode, bool leaveOpen, bool gzip)
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{
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if (compressedStream == null)
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throw new ArgumentNullException ("compressedStream");
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if (mode != CompressionMode.Compress && mode != CompressionMode.Decompress)
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throw new ArgumentException ("mode");
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this.base_stream = compressedStream;
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this.native = DeflateStreamNative.Create (compressedStream, mode, gzip);
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if (this.native == null) {
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throw new NotImplementedException ("Failed to initialize zlib. You probably have an old zlib installed. Version 1.2.0.4 or later is required.");
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}
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this.mode = mode;
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this.leaveOpen = leaveOpen;
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}
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public DeflateStream (Stream stream, CompressionLevel compressionLevel)
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: this (stream, compressionLevel, false, false)
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{
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}
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public DeflateStream (Stream stream, CompressionLevel compressionLevel, bool leaveOpen)
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: this (stream, compressionLevel, leaveOpen, false)
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{
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}
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internal DeflateStream (Stream stream, CompressionLevel compressionLevel, bool leaveOpen, int windowsBits)
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: this (stream, compressionLevel, leaveOpen, true)
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{
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}
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internal DeflateStream (Stream stream, CompressionLevel compressionLevel, bool leaveOpen, bool gzip)
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: this (stream, CompressionMode.Compress, leaveOpen, gzip)
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{
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}
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~DeflateStream () => Dispose (false);
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protected override void Dispose (bool disposing)
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{
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if (disposing)
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GC.SuppressFinalize (this);
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native.Dispose (disposing);
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if (disposing && !disposed) {
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disposed = true;
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if (!leaveOpen) {
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Stream st = base_stream;
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if (st != null)
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st.Close ();
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base_stream = null;
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}
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}
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base.Dispose (disposing);
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}
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unsafe int ReadInternal (byte[] array, int offset, int count)
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{
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if (count == 0)
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return 0;
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fixed (byte *b = array) {
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IntPtr ptr = new IntPtr (b + offset);
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return native.ReadZStream (ptr, count);
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}
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}
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internal ValueTask<int> ReadAsyncMemory (Memory<byte> destination, CancellationToken cancellationToken)
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{
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throw new NotImplementedException ();
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}
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internal int ReadCore (Span<byte> destination)
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{
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throw new NotImplementedException ();
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}
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public override int Read (byte[] array, int offset, int count)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().FullName);
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if (array == null)
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throw new ArgumentNullException ("Destination array is null.");
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if (!CanRead)
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throw new InvalidOperationException ("Stream does not support reading.");
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int len = array.Length;
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if (offset < 0 || count < 0)
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throw new ArgumentException ("Dest or count is negative.");
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if (offset > len)
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throw new ArgumentException ("destination offset is beyond array size");
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if ((offset + count) > len)
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throw new ArgumentException ("Reading would overrun buffer");
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return ReadInternal (array, offset, count);
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}
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unsafe void WriteInternal (byte[] array, int offset, int count)
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{
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if (count == 0)
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return;
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fixed (byte *b = array) {
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IntPtr ptr = new IntPtr (b + offset);
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native.WriteZStream (ptr, count);
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}
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}
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internal ValueTask WriteAsyncMemory (ReadOnlyMemory<byte> source, CancellationToken cancellationToken)
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{
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throw new NotImplementedException ();
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}
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internal void WriteCore (ReadOnlySpan<byte> source)
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{
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throw new NotImplementedException ();
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}
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public override void Write (byte[] array, int offset, int count)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().FullName);
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if (array == null)
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throw new ArgumentNullException ("array");
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset");
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if (count < 0)
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throw new ArgumentOutOfRangeException ("count");
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if (!CanWrite)
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throw new NotSupportedException ("Stream does not support writing");
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if (offset > array.Length - count)
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throw new ArgumentException ("Buffer too small. count/offset wrong.");
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WriteInternal (array, offset, count);
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}
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public override void Flush ()
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().FullName);
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if (CanWrite) {
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native.Flush ();
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}
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}
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public override IAsyncResult BeginRead (byte [] array, int offset, int count,
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AsyncCallback asyncCallback, object asyncState)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().FullName);
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if (!CanRead)
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throw new NotSupportedException ("This stream does not support reading");
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if (array == null)
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throw new ArgumentNullException ("array");
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if (count < 0)
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throw new ArgumentOutOfRangeException ("count", "Must be >= 0");
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset", "Must be >= 0");
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if (count + offset > array.Length)
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throw new ArgumentException ("Buffer too small. count/offset wrong.");
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ReadMethod r = new ReadMethod (ReadInternal);
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return r.BeginInvoke (array, offset, count, asyncCallback, asyncState);
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}
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public override IAsyncResult BeginWrite (byte [] array, int offset, int count,
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AsyncCallback asyncCallback, object asyncState)
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{
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if (disposed)
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throw new ObjectDisposedException (GetType ().FullName);
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if (!CanWrite)
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throw new InvalidOperationException ("This stream does not support writing");
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if (array == null)
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throw new ArgumentNullException ("array");
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if (count < 0)
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throw new ArgumentOutOfRangeException ("count", "Must be >= 0");
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if (offset < 0)
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throw new ArgumentOutOfRangeException ("offset", "Must be >= 0");
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if (count + offset > array.Length)
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throw new ArgumentException ("Buffer too small. count/offset wrong.");
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WriteMethod w = new WriteMethod (WriteInternal);
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return w.BeginInvoke (array, offset, count, asyncCallback, asyncState);
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}
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public override int EndRead(IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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AsyncResult ares = asyncResult as AsyncResult;
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if (ares == null)
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throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
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ReadMethod r = ares.AsyncDelegate as ReadMethod;
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if (r == null)
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throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
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return r.EndInvoke (asyncResult);
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}
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public override void EndWrite (IAsyncResult asyncResult)
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{
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if (asyncResult == null)
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throw new ArgumentNullException ("asyncResult");
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AsyncResult ares = asyncResult as AsyncResult;
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if (ares == null)
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throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
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WriteMethod w = ares.AsyncDelegate as WriteMethod;
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if (w == null)
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throw new ArgumentException ("Invalid IAsyncResult", "asyncResult");
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w.EndInvoke (asyncResult);
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return;
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException();
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}
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public override void SetLength (long value)
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{
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throw new NotSupportedException();
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}
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public Stream BaseStream {
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get { return base_stream; }
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}
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public override bool CanRead {
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get { return !disposed && mode == CompressionMode.Decompress && base_stream.CanRead; }
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}
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public override bool CanSeek {
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get { return false; }
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}
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public override bool CanWrite {
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get { return !disposed && mode == CompressionMode.Compress && base_stream.CanWrite; }
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}
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public override long Length {
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get { throw new NotSupportedException(); }
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}
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public override long Position {
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get { throw new NotSupportedException(); }
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set { throw new NotSupportedException(); }
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}
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}
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class DeflateStreamNative
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{
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const int BufferSize = 4096;
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[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
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delegate int UnmanagedReadOrWrite (IntPtr buffer, int length, IntPtr data);
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UnmanagedReadOrWrite feeder; // This will be passed to unmanaged code and used there
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Stream base_stream;
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SafeDeflateStreamHandle z_stream;
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GCHandle data;
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bool disposed;
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byte [] io_buffer;
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Exception last_error;
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private DeflateStreamNative ()
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{
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}
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public static DeflateStreamNative Create (Stream compressedStream, CompressionMode mode, bool gzip)
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{
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var dsn = new DeflateStreamNative ();
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dsn.data = GCHandle.Alloc (dsn);
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dsn.feeder = mode == CompressionMode.Compress ? new UnmanagedReadOrWrite (UnmanagedWrite) : new UnmanagedReadOrWrite (UnmanagedRead);
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dsn.z_stream = CreateZStream (mode, gzip, dsn.feeder, GCHandle.ToIntPtr (dsn.data));
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if (dsn.z_stream.IsInvalid) {
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dsn.Dispose (true);
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return null;
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}
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dsn.base_stream = compressedStream;
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return dsn;
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}
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~DeflateStreamNative ()
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{
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Dispose (false);
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}
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public void Dispose (bool disposing)
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{
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if (disposing && !disposed) {
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disposed = true;
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GC.SuppressFinalize (this);
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} else {
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// When we are in the finalizer we don't want to access the underlying stream anymore
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base_stream = Stream.Null;
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}
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io_buffer = null;
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if (z_stream != null) {
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z_stream.Dispose();
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}
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if (data.IsAllocated) {
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data.Free ();
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}
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}
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public void Flush ()
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{
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var res = Flush (z_stream);
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CheckResult (res, "Flush");
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}
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public int ReadZStream (IntPtr buffer, int length)
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{
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var res = ReadZStream (z_stream, buffer, length);
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CheckResult (res, "ReadInternal");
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return res;
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}
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public void WriteZStream (IntPtr buffer, int length)
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{
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var res = WriteZStream (z_stream, buffer, length);
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CheckResult (res, "WriteInternal");
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}
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[Mono.Util.MonoPInvokeCallback (typeof (UnmanagedReadOrWrite))]
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static int UnmanagedRead (IntPtr buffer, int length, IntPtr data)
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{
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GCHandle s = GCHandle.FromIntPtr (data);
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var self = s.Target as DeflateStreamNative;
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if (self == null)
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return -1;
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return self.UnmanagedRead (buffer, length);
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}
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int UnmanagedRead (IntPtr buffer, int length)
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{
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if (io_buffer == null)
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io_buffer = new byte [BufferSize];
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int count = Math.Min (length, io_buffer.Length);
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int n;
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try {
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n = base_stream.Read (io_buffer, 0, count);
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} catch (Exception ex) {
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last_error = ex;
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return -12;
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}
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if (n > 0)
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Marshal.Copy (io_buffer, 0, buffer, n);
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return n;
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}
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[Mono.Util.MonoPInvokeCallback (typeof (UnmanagedReadOrWrite))]
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static int UnmanagedWrite (IntPtr buffer, int length, IntPtr data)
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{
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GCHandle s = GCHandle.FromIntPtr (data);
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var self = s.Target as DeflateStreamNative;
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if (self == null)
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return -1;
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return self.UnmanagedWrite (buffer, length);
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}
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int UnmanagedWrite (IntPtr buffer, int length)
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{
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int total = 0;
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while (length > 0) {
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if (io_buffer == null)
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io_buffer = new byte [BufferSize];
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int count = Math.Min (length, io_buffer.Length);
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Marshal.Copy (buffer, io_buffer, 0, count);
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try {
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base_stream.Write (io_buffer, 0, count);
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} catch (Exception ex) {
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last_error = ex;
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return -12;
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}
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unsafe {
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buffer = new IntPtr ((byte *) buffer.ToPointer () + count);
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}
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length -= count;
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total += count;
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}
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return total;
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}
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void CheckResult (int result, string where)
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{
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if (result >= 0)
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return;
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var throw_me = Interlocked.Exchange (ref last_error, null);
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if (throw_me != null)
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throw throw_me;
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string error;
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switch (result) {
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case -1: // Z_ERRNO
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error = "Unknown error"; // Marshal.GetLastWin32() ?
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break;
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case -2: // Z_STREAM_ERROR
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error = "Internal error";
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break;
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case -3: // Z_DATA_ERROR
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error = "Corrupted data";
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break;
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case -4: // Z_MEM_ERROR
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error = "Not enough memory";
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break;
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case -5: // Z_BUF_ERROR
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error = "Internal error (no progress possible)";
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break;
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case -6: // Z_VERSION_ERROR
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error = "Invalid version";
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break;
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case -10:
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error = "Invalid argument(s)";
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break;
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case -11:
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error = "IO error";
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break;
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default:
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error = "Unknown error";
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break;
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}
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throw new IOException (error + " " + where);
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}
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#if ORBIS
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static SafeDeflateStreamHandle CreateZStream (CompressionMode compress, bool gzip, UnmanagedReadOrWrite feeder, IntPtr data)
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{
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throw new PlatformNotSupportedException ();
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}
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static int CloseZStream (IntPtr stream)
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{
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throw new PlatformNotSupportedException ();
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}
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static int Flush (SafeDeflateStreamHandle stream)
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{
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throw new PlatformNotSupportedException ();
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}
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static int ReadZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length)
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{
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throw new PlatformNotSupportedException ();
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}
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static int WriteZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length)
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{
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throw new PlatformNotSupportedException ();
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}
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#elif MONOTOUCH || MONODROID
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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static extern IntPtr CreateZStream (int compress, bool gzip, IntPtr feeder, IntPtr data);
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static SafeDeflateStreamHandle CreateZStream (CompressionMode compress, bool gzip, UnmanagedReadOrWrite feeder, IntPtr data)
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{
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SafeDeflateStreamHandle res;
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try {} finally {
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res = new SafeDeflateStreamHandle (CreateZStream ((int) compress, gzip, Marshal.GetFunctionPointerForDelegate<UnmanagedReadOrWrite> (feeder), data));
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}
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return res;
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}
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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static extern int CloseZStream (IntPtr stream);
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[MethodImplAttribute(MethodImplOptions.InternalCall)]
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static extern int Flush (IntPtr stream);
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static int Flush (SafeDeflateStreamHandle stream)
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{
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bool release = false;
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try {
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stream.DangerousAddRef (ref release);
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return Flush (stream.DangerousGetHandle ());
|
|
} finally {
|
|
if (release)
|
|
stream.DangerousRelease ();
|
|
}
|
|
}
|
|
|
|
[MethodImplAttribute(MethodImplOptions.InternalCall)]
|
|
static extern int ReadZStream (IntPtr stream, IntPtr buffer, int length);
|
|
|
|
static int ReadZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length)
|
|
{
|
|
bool release = false;
|
|
try {
|
|
stream.DangerousAddRef (ref release);
|
|
return ReadZStream (stream.DangerousGetHandle (), buffer, length);
|
|
} finally {
|
|
if (release)
|
|
stream.DangerousRelease ();
|
|
}
|
|
}
|
|
|
|
[MethodImplAttribute(MethodImplOptions.InternalCall)]
|
|
static extern int WriteZStream (IntPtr stream, IntPtr buffer, int length);
|
|
|
|
static int WriteZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length)
|
|
{
|
|
bool release = false;
|
|
try {
|
|
stream.DangerousAddRef (ref release);
|
|
return WriteZStream (stream.DangerousGetHandle (), buffer, length);
|
|
} finally {
|
|
if (release)
|
|
stream.DangerousRelease ();
|
|
}
|
|
}
|
|
#else
|
|
[DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
|
|
static extern SafeDeflateStreamHandle CreateZStream (CompressionMode compress, bool gzip, UnmanagedReadOrWrite feeder, IntPtr data);
|
|
|
|
[DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
|
|
static extern int CloseZStream (IntPtr stream);
|
|
|
|
[DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
|
|
static extern int Flush (SafeDeflateStreamHandle stream);
|
|
|
|
[DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
|
|
static extern int ReadZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length);
|
|
|
|
[DllImport ("MonoPosixHelper", CallingConvention=CallingConvention.Cdecl)]
|
|
static extern int WriteZStream (SafeDeflateStreamHandle stream, IntPtr buffer, int length);
|
|
#endif
|
|
|
|
sealed class SafeDeflateStreamHandle : SafeHandle
|
|
{
|
|
public override bool IsInvalid
|
|
{
|
|
get { return handle == IntPtr.Zero; }
|
|
}
|
|
|
|
private SafeDeflateStreamHandle() : base(IntPtr.Zero, true)
|
|
{
|
|
}
|
|
|
|
internal SafeDeflateStreamHandle(IntPtr handle) : base (handle, true)
|
|
{
|
|
}
|
|
|
|
override protected bool ReleaseHandle()
|
|
{
|
|
try {
|
|
DeflateStreamNative.CloseZStream(handle);
|
|
} catch {
|
|
;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|