Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / 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
- VBIdentifierDesigner.xaml.cs
- SystemResourceKey.cs
- ReliableSessionBindingElement.cs
- PasswordRecovery.cs
- ThreadAbortException.cs
- StagingAreaInputItem.cs
- Icon.cs
- Faults.cs
- SafeNativeMethods.cs
- CheckBoxField.cs
- PrintDialog.cs
- CacheOutputQuery.cs
- coordinatorfactory.cs
- LinkArea.cs
- Delegate.cs
- ListViewItem.cs
- SystemMulticastIPAddressInformation.cs
- SamlNameIdentifierClaimResource.cs
- SubstitutionList.cs
- AttachedPropertyBrowsableForChildrenAttribute.cs
- PathGeometry.cs
- LogManagementAsyncResult.cs
- IntSecurity.cs
- RelatedImageListAttribute.cs
- EventsTab.cs
- RuntimeWrappedException.cs
- MatrixAnimationBase.cs
- FontSizeConverter.cs
- AtomServiceDocumentSerializer.cs
- Composition.cs
- CodeNamespaceImport.cs
- ZipIOLocalFileDataDescriptor.cs
- M3DUtil.cs
- COM2FontConverter.cs
- EventSetterHandlerConverter.cs
- SerializationSectionGroup.cs
- CodePrimitiveExpression.cs
- ReadContentAsBinaryHelper.cs
- DetailsViewPageEventArgs.cs
- GroupLabel.cs
- UiaCoreApi.cs
- XmlQueryRuntime.cs
- SqlCacheDependencyDatabaseCollection.cs
- BinaryObjectReader.cs
- SortExpressionBuilder.cs
- InfoCardClaimCollection.cs
- StringUtil.cs
- DataMisalignedException.cs
- NamedElement.cs
- TableRowGroup.cs
- _SslSessionsCache.cs
- StylusPointPropertyInfo.cs
- CodeTypeReferenceExpression.cs
- UserCancellationException.cs
- ConnectionManager.cs
- WorkflowApplicationUnloadedException.cs
- MenuEventArgs.cs
- EndpointIdentityConverter.cs
- PersonalizationStateQuery.cs
- SelectionRangeConverter.cs
- DocumentViewerHelper.cs
- ThicknessKeyFrameCollection.cs
- AutomationPattern.cs
- AuthenticationModulesSection.cs
- VariantWrapper.cs
- ElementNotAvailableException.cs
- FunctionDescription.cs
- UnaryOperationBinder.cs
- MarshalByValueComponent.cs
- DataChangedEventManager.cs
- TextTrailingWordEllipsis.cs
- ProtocolsConfigurationEntry.cs
- CompilerErrorCollection.cs
- XmlQueryOutput.cs
- ActivationArguments.cs
- XmlSerializerVersionAttribute.cs
- FrameworkContextData.cs
- TextComposition.cs
- ObjectListItem.cs
- SoapExtension.cs
- TextCompositionEventArgs.cs
- DBNull.cs
- SecurityUtils.cs
- RegexGroup.cs
- FormsAuthentication.cs
- InfoCardCryptoHelper.cs
- QueryCacheManager.cs
- _BasicClient.cs
- StreamingContext.cs
- BuildManager.cs
- WebPartDescription.cs
- Scripts.cs
- MarkedHighlightComponent.cs
- EdmToObjectNamespaceMap.cs
- XhtmlBasicFormAdapter.cs
- MediaElementAutomationPeer.cs
- ContextStaticAttribute.cs
- TypeConverterAttribute.cs
- Serializer.cs
- FusionWrap.cs