Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / CommonUI / System / Drawing / Advanced / GPStream.cs / 1 / GPStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Internal { using System; using System.IO; using System.Drawing; using System.Runtime.InteropServices; using System.Diagnostics.CodeAnalysis; using System.Security.Permissions; internal class GPStream : UnsafeNativeMethods.IStream { protected Stream dataStream; // to support seeking ahead of the stream length... long virtualPosition = -1; internal GPStream(Stream stream) { if (!stream.CanSeek) { const int ReadBlock = 256; byte[] bytes = new byte[ReadBlock]; int readLen; int current = 0; do { if (bytes.Length < current + ReadBlock) { byte[] newData = new byte[bytes.Length * 2]; Array.Copy(bytes, newData, bytes.Length); bytes = newData; } readLen = stream.Read(bytes, current, ReadBlock); current += readLen; } while (readLen != 0); dataStream = new MemoryStream(bytes); } else { dataStream = stream; } } private void ActualizeVirtualPosition() { if (virtualPosition == -1) return; if (virtualPosition > dataStream.Length) dataStream.SetLength(virtualPosition); dataStream.Position = virtualPosition; virtualPosition = -1; } public virtual UnsafeNativeMethods.IStream Clone() { NotImplemented(); return null; } public virtual void Commit(int grfCommitFlags) { dataStream.Flush(); // Extend the length of the file if needed. ActualizeVirtualPosition(); } [ UIPermission(SecurityAction.Demand, Window=UIPermissionWindow.AllWindows), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode) ] public virtual long CopyTo(UnsafeNativeMethods.IStream pstm, long cb, long[] pcbRead) { int bufsize = 4096; // one page IntPtr buffer = Marshal.AllocHGlobal(bufsize); if (buffer == IntPtr.Zero) throw new OutOfMemoryException(); long written = 0; try { while (written < cb) { int toRead = bufsize; if (written + toRead > cb) toRead = (int) (cb - written); int read = Read(buffer, toRead); if (read == 0) break; if (pstm.Write(buffer, read) != read) { throw EFail("Wrote an incorrect number of bytes"); } written += read; } } finally { Marshal.FreeHGlobal(buffer); } if (pcbRead != null && pcbRead.Length > 0) { pcbRead[0] = written; } return written; } public virtual Stream GetDataStream() { return dataStream; } public virtual void LockRegion(long libOffset, long cb, int dwLockType) { } protected static ExternalException EFail(string msg) { throw new ExternalException(msg, SafeNativeMethods.E_FAIL); } protected static void NotImplemented() { throw new ExternalException(SR.GetString(SR.NotImplemented), SafeNativeMethods.E_NOTIMPL); } public virtual int Read(IntPtr buf, /* cpr: int offset,*/ int length) { // System.Text.Out.WriteLine("IStream::Read(" + length + ")"); byte[] buffer = new byte[length]; int count = Read(buffer, length); Marshal.Copy(buffer, 0, buf, length); return count; } public virtual int Read(byte[] buffer, /* cpr: int offset,*/ int length) { ActualizeVirtualPosition(); return dataStream.Read(buffer, 0, length); } public virtual void Revert() { NotImplemented(); } public virtual long Seek(long offset, int origin) { // Console.WriteLine("IStream::Seek("+ offset + ", " + origin + ")"); long pos = virtualPosition; if (virtualPosition == -1) { pos = dataStream.Position; } long len = dataStream.Length; switch (origin) { case SafeNativeMethods.StreamConsts.STREAM_SEEK_SET: if (offset <= len) { dataStream.Position = offset; virtualPosition = -1; } else { virtualPosition = offset; } break; case SafeNativeMethods.StreamConsts.STREAM_SEEK_END: if (offset <= 0) { dataStream.Position = len + offset; virtualPosition = -1; } else { virtualPosition = len + offset; } break; case SafeNativeMethods.StreamConsts.STREAM_SEEK_CUR: if (offset+pos <= len) { dataStream.Position = pos + offset; virtualPosition = -1; } else { virtualPosition = offset + pos; } break; } if (virtualPosition != -1) { return virtualPosition; } else { return dataStream.Position; } } public virtual void SetSize(long value) { dataStream.SetLength(value); } public void Stat(IntPtr pstatstg, int grfStatFlag) { STATSTG stats = new STATSTG(); stats.cbSize = dataStream.Length; Marshal.StructureToPtr(stats, pstatstg, true); } public virtual void UnlockRegion(long libOffset, long cb, int dwLockType) { } public virtual int Write(IntPtr buf, /* cpr: int offset,*/ int length) { byte[] buffer = new byte[length]; Marshal.Copy(buf, buffer, 0, length); return Write(buffer, length); } public virtual int Write(byte[] buffer, /* cpr: int offset,*/ int length) { ActualizeVirtualPosition(); dataStream.Write(buffer, 0, length); return length; } [StructLayout(LayoutKind.Sequential)] public class STATSTG { [SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] public IntPtr pwcsName = IntPtr.Zero; public int type = 0; [MarshalAs(UnmanagedType.I8)] public long cbSize; [MarshalAs(UnmanagedType.I8)] public long mtime = 0; [MarshalAs(UnmanagedType.I8)] public long ctime = 0; [MarshalAs(UnmanagedType.I8)] public long atime = 0; [MarshalAs(UnmanagedType.I4)] public int grfMode = 0; [MarshalAs(UnmanagedType.I4)] public int grfLocksSupported = 0; public int clsid_data1 = 0; [MarshalAs(UnmanagedType.I2)] public short clsid_data2 = 0; [MarshalAs(UnmanagedType.I2)] public short clsid_data3 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b0 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b1 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b2 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b3 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b4 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b5 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b6 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b7 = 0; [MarshalAs(UnmanagedType.I4)] public int grfStateBits = 0; [MarshalAs(UnmanagedType.I4)] public int reserved = 0; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Drawing.Internal { using System; using System.IO; using System.Drawing; using System.Runtime.InteropServices; using System.Diagnostics.CodeAnalysis; using System.Security.Permissions; internal class GPStream : UnsafeNativeMethods.IStream { protected Stream dataStream; // to support seeking ahead of the stream length... long virtualPosition = -1; internal GPStream(Stream stream) { if (!stream.CanSeek) { const int ReadBlock = 256; byte[] bytes = new byte[ReadBlock]; int readLen; int current = 0; do { if (bytes.Length < current + ReadBlock) { byte[] newData = new byte[bytes.Length * 2]; Array.Copy(bytes, newData, bytes.Length); bytes = newData; } readLen = stream.Read(bytes, current, ReadBlock); current += readLen; } while (readLen != 0); dataStream = new MemoryStream(bytes); } else { dataStream = stream; } } private void ActualizeVirtualPosition() { if (virtualPosition == -1) return; if (virtualPosition > dataStream.Length) dataStream.SetLength(virtualPosition); dataStream.Position = virtualPosition; virtualPosition = -1; } public virtual UnsafeNativeMethods.IStream Clone() { NotImplemented(); return null; } public virtual void Commit(int grfCommitFlags) { dataStream.Flush(); // Extend the length of the file if needed. ActualizeVirtualPosition(); } [ UIPermission(SecurityAction.Demand, Window=UIPermissionWindow.AllWindows), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode) ] public virtual long CopyTo(UnsafeNativeMethods.IStream pstm, long cb, long[] pcbRead) { int bufsize = 4096; // one page IntPtr buffer = Marshal.AllocHGlobal(bufsize); if (buffer == IntPtr.Zero) throw new OutOfMemoryException(); long written = 0; try { while (written < cb) { int toRead = bufsize; if (written + toRead > cb) toRead = (int) (cb - written); int read = Read(buffer, toRead); if (read == 0) break; if (pstm.Write(buffer, read) != read) { throw EFail("Wrote an incorrect number of bytes"); } written += read; } } finally { Marshal.FreeHGlobal(buffer); } if (pcbRead != null && pcbRead.Length > 0) { pcbRead[0] = written; } return written; } public virtual Stream GetDataStream() { return dataStream; } public virtual void LockRegion(long libOffset, long cb, int dwLockType) { } protected static ExternalException EFail(string msg) { throw new ExternalException(msg, SafeNativeMethods.E_FAIL); } protected static void NotImplemented() { throw new ExternalException(SR.GetString(SR.NotImplemented), SafeNativeMethods.E_NOTIMPL); } public virtual int Read(IntPtr buf, /* cpr: int offset,*/ int length) { // System.Text.Out.WriteLine("IStream::Read(" + length + ")"); byte[] buffer = new byte[length]; int count = Read(buffer, length); Marshal.Copy(buffer, 0, buf, length); return count; } public virtual int Read(byte[] buffer, /* cpr: int offset,*/ int length) { ActualizeVirtualPosition(); return dataStream.Read(buffer, 0, length); } public virtual void Revert() { NotImplemented(); } public virtual long Seek(long offset, int origin) { // Console.WriteLine("IStream::Seek("+ offset + ", " + origin + ")"); long pos = virtualPosition; if (virtualPosition == -1) { pos = dataStream.Position; } long len = dataStream.Length; switch (origin) { case SafeNativeMethods.StreamConsts.STREAM_SEEK_SET: if (offset <= len) { dataStream.Position = offset; virtualPosition = -1; } else { virtualPosition = offset; } break; case SafeNativeMethods.StreamConsts.STREAM_SEEK_END: if (offset <= 0) { dataStream.Position = len + offset; virtualPosition = -1; } else { virtualPosition = len + offset; } break; case SafeNativeMethods.StreamConsts.STREAM_SEEK_CUR: if (offset+pos <= len) { dataStream.Position = pos + offset; virtualPosition = -1; } else { virtualPosition = offset + pos; } break; } if (virtualPosition != -1) { return virtualPosition; } else { return dataStream.Position; } } public virtual void SetSize(long value) { dataStream.SetLength(value); } public void Stat(IntPtr pstatstg, int grfStatFlag) { STATSTG stats = new STATSTG(); stats.cbSize = dataStream.Length; Marshal.StructureToPtr(stats, pstatstg, true); } public virtual void UnlockRegion(long libOffset, long cb, int dwLockType) { } public virtual int Write(IntPtr buf, /* cpr: int offset,*/ int length) { byte[] buffer = new byte[length]; Marshal.Copy(buf, buffer, 0, length); return Write(buffer, length); } public virtual int Write(byte[] buffer, /* cpr: int offset,*/ int length) { ActualizeVirtualPosition(); dataStream.Write(buffer, 0, length); return length; } [StructLayout(LayoutKind.Sequential)] public class STATSTG { [SuppressMessage("Microsoft.Reliability", "CA2006:UseSafeHandleToEncapsulateNativeResources")] public IntPtr pwcsName = IntPtr.Zero; public int type = 0; [MarshalAs(UnmanagedType.I8)] public long cbSize; [MarshalAs(UnmanagedType.I8)] public long mtime = 0; [MarshalAs(UnmanagedType.I8)] public long ctime = 0; [MarshalAs(UnmanagedType.I8)] public long atime = 0; [MarshalAs(UnmanagedType.I4)] public int grfMode = 0; [MarshalAs(UnmanagedType.I4)] public int grfLocksSupported = 0; public int clsid_data1 = 0; [MarshalAs(UnmanagedType.I2)] public short clsid_data2 = 0; [MarshalAs(UnmanagedType.I2)] public short clsid_data3 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b0 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b1 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b2 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b3 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b4 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b5 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b6 = 0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b7 = 0; [MarshalAs(UnmanagedType.I4)] public int grfStateBits = 0; [MarshalAs(UnmanagedType.I4)] public int reserved = 0; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ChannelBinding.cs
- SignatureDescription.cs
- SqlFunctionAttribute.cs
- RSACryptoServiceProvider.cs
- UnaryNode.cs
- FaultDescriptionCollection.cs
- SystemIcmpV6Statistics.cs
- TargetConverter.cs
- querybuilder.cs
- InputLangChangeEvent.cs
- EndOfStreamException.cs
- IntellisenseTextBox.cs
- RIPEMD160.cs
- ListView.cs
- MethodToken.cs
- _HelperAsyncResults.cs
- ReadOnlyDictionary.cs
- AnimationClockResource.cs
- WebPartDisplayModeCancelEventArgs.cs
- IntegrationExceptionEventArgs.cs
- SupportsPreviewControlAttribute.cs
- Menu.cs
- HybridDictionary.cs
- Frame.cs
- PlatformCulture.cs
- Typeface.cs
- StackBuilderSink.cs
- KeyFrames.cs
- XhtmlConformanceSection.cs
- ValidationErrorCollection.cs
- PermissionRequestEvidence.cs
- FrameAutomationPeer.cs
- HtmlAnchor.cs
- PtsPage.cs
- PaginationProgressEventArgs.cs
- SchemaCollectionPreprocessor.cs
- RepeatInfo.cs
- LoginNameDesigner.cs
- StateRuntime.cs
- SafeFileMappingHandle.cs
- GeometryModel3D.cs
- TypeFieldSchema.cs
- CodeRemoveEventStatement.cs
- BindUriHelper.cs
- CommandEventArgs.cs
- AnnotationComponentManager.cs
- MaskedTextBoxTextEditorDropDown.cs
- List.cs
- StringComparer.cs
- RegexParser.cs
- WindowsProgressbar.cs
- CommonDialog.cs
- ScriptingAuthenticationServiceSection.cs
- Run.cs
- TimeIntervalCollection.cs
- Deflater.cs
- basecomparevalidator.cs
- SqlTypeSystemProvider.cs
- AddressAccessDeniedException.cs
- IndexedGlyphRun.cs
- DesignerActionHeaderItem.cs
- LinearGradientBrush.cs
- ConfigurationStrings.cs
- CryptoConfig.cs
- DependentTransaction.cs
- EncryptedData.cs
- SynchronizationScope.cs
- PasswordPropertyTextAttribute.cs
- UnicastIPAddressInformationCollection.cs
- WeakHashtable.cs
- ValidationSummary.cs
- Dispatcher.cs
- EditorPart.cs
- GlyphTypeface.cs
- DSASignatureFormatter.cs
- WorkItem.cs
- ScrollProviderWrapper.cs
- ValidateNames.cs
- ManualResetEvent.cs
- ConfigurationElementCollection.cs
- ParameterModifier.cs
- CodeDomLoader.cs
- FlowLayoutSettings.cs
- PseudoWebRequest.cs
- QilXmlReader.cs
- SinglePageViewer.cs
- RoleManagerModule.cs
- TemplateControlBuildProvider.cs
- ProtectedProviderSettings.cs
- UnsafeNativeMethods.cs
- DynamicFilterExpression.cs
- Terminate.cs
- ByteStorage.cs
- View.cs
- PointAnimation.cs
- Int32Converter.cs
- Int16Storage.cs
- WindowsFormsHostPropertyMap.cs
- SmtpNtlmAuthenticationModule.cs
- ActivationWorker.cs