Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Advanced / GPStream.cs / 1305376 / 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); } [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")] 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; } [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")] 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; [MarshalAs(UnmanagedType.I8)] public long cbSize; [MarshalAs(UnmanagedType.I8)] public long mtime; [MarshalAs(UnmanagedType.I8)] public long ctime; [MarshalAs(UnmanagedType.I8)] public long atime; [MarshalAs(UnmanagedType.I4)] public int grfMode; [MarshalAs(UnmanagedType.I4)] public int grfLocksSupported; public int clsid_data1; [MarshalAs(UnmanagedType.I2)] public short clsid_data2; [MarshalAs(UnmanagedType.I2)] public short clsid_data3; [MarshalAs(UnmanagedType.U1)] public byte clsid_b0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b1; [MarshalAs(UnmanagedType.U1)] public byte clsid_b2; [MarshalAs(UnmanagedType.U1)] public byte clsid_b3; [MarshalAs(UnmanagedType.U1)] public byte clsid_b4; [MarshalAs(UnmanagedType.U1)] public byte clsid_b5; [MarshalAs(UnmanagedType.U1)] public byte clsid_b6; [MarshalAs(UnmanagedType.U1)] public byte clsid_b7; [MarshalAs(UnmanagedType.I4)] public int grfStateBits; [MarshalAs(UnmanagedType.I4)] public int reserved; } } } // 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); } [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")] 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; } [System.Runtime.TargetedPatchingOptOutAttribute("Performance critical to inline across NGen image boundaries")] 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; [MarshalAs(UnmanagedType.I8)] public long cbSize; [MarshalAs(UnmanagedType.I8)] public long mtime; [MarshalAs(UnmanagedType.I8)] public long ctime; [MarshalAs(UnmanagedType.I8)] public long atime; [MarshalAs(UnmanagedType.I4)] public int grfMode; [MarshalAs(UnmanagedType.I4)] public int grfLocksSupported; public int clsid_data1; [MarshalAs(UnmanagedType.I2)] public short clsid_data2; [MarshalAs(UnmanagedType.I2)] public short clsid_data3; [MarshalAs(UnmanagedType.U1)] public byte clsid_b0; [MarshalAs(UnmanagedType.U1)] public byte clsid_b1; [MarshalAs(UnmanagedType.U1)] public byte clsid_b2; [MarshalAs(UnmanagedType.U1)] public byte clsid_b3; [MarshalAs(UnmanagedType.U1)] public byte clsid_b4; [MarshalAs(UnmanagedType.U1)] public byte clsid_b5; [MarshalAs(UnmanagedType.U1)] public byte clsid_b6; [MarshalAs(UnmanagedType.U1)] public byte clsid_b7; [MarshalAs(UnmanagedType.I4)] public int grfStateBits; [MarshalAs(UnmanagedType.I4)] public int reserved; } } } // 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
- PersonalizationAdministration.cs
- RawStylusInputCustomData.cs
- ThreadPool.cs
- MenuItemBindingCollection.cs
- Path.cs
- ServiceHttpHandlerFactory.cs
- QueryResponse.cs
- MetabaseServerConfig.cs
- AppDomainUnloadedException.cs
- ScrollBar.cs
- SchemaImporterExtensionElementCollection.cs
- CompiledRegexRunner.cs
- XmlDocument.cs
- DocumentXmlWriter.cs
- Visitor.cs
- EdmProviderManifest.cs
- PlainXmlSerializer.cs
- DbConnectionPoolCounters.cs
- EncoderReplacementFallback.cs
- HttpPostedFile.cs
- _TimerThread.cs
- XmlMapping.cs
- UnknownBitmapDecoder.cs
- ComplexType.cs
- SkipStoryboardToFill.cs
- ListViewInsertEventArgs.cs
- FixedDocumentSequencePaginator.cs
- MessagePropertyVariants.cs
- QuotedPrintableStream.cs
- ColorAnimationUsingKeyFrames.cs
- XmlProcessingInstruction.cs
- DataListItemEventArgs.cs
- SchemaEntity.cs
- Run.cs
- DynamicResourceExtensionConverter.cs
- XMLSchema.cs
- StringBuilder.cs
- PackageRelationshipCollection.cs
- Main.cs
- ColumnMapVisitor.cs
- ChildDocumentBlock.cs
- DeclarativeCatalogPart.cs
- SolidBrush.cs
- LabelExpression.cs
- TimeSpanSecondsOrInfiniteConverter.cs
- MimeMultiPart.cs
- Page.cs
- FileDataSourceCache.cs
- GridViewSortEventArgs.cs
- RadioButton.cs
- FontClient.cs
- PropertyKey.cs
- EmbossBitmapEffect.cs
- ToolStripSeparator.cs
- CodeMethodReturnStatement.cs
- _WinHttpWebProxyDataBuilder.cs
- BulletedList.cs
- BindingSource.cs
- ViewEvent.cs
- HtmlInputText.cs
- EventEntry.cs
- CodeTypeDeclaration.cs
- Stylesheet.cs
- SqlXml.cs
- HtmlInputImage.cs
- MetaColumn.cs
- AccessDataSource.cs
- StrongNameMembershipCondition.cs
- XsdBuildProvider.cs
- LogicalTreeHelper.cs
- StorageEntitySetMapping.cs
- DelegateTypeInfo.cs
- Graph.cs
- KeyPressEvent.cs
- OleDbReferenceCollection.cs
- SerialReceived.cs
- XamlParser.cs
- ToolboxCategoryItems.cs
- AtomServiceDocumentSerializer.cs
- wmiutil.cs
- VariableQuery.cs
- BaseUriHelper.cs
- ThicknessAnimationBase.cs
- DataBoundControlAdapter.cs
- PaperSource.cs
- Console.cs
- XmlUtil.cs
- SqlClientFactory.cs
- TraceContextEventArgs.cs
- UnknownBitmapEncoder.cs
- TreeViewImageGenerator.cs
- StorageEntityContainerMapping.cs
- XmlnsCache.cs
- MasterPage.cs
- ContentType.cs
- Pair.cs
- figurelengthconverter.cs
- followingsibling.cs
- Root.cs
- DescendantQuery.cs