Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / CommonUI / System / Drawing / UnsafeNativeMethods.cs / 1 / UnsafeNativeMethods.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Drawing.UnsafeNativeMethods..ctor()")] namespace System.Drawing { using System.Runtime.InteropServices; using System; using System.Security.Permissions; using System.Collections; using System.IO; using System.Text; using System.Diagnostics.CodeAnalysis; [ System.Security.SuppressUnmanagedCodeSecurityAttribute() ] internal class UnsafeNativeMethods { [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage")] [DllImport(ExternDll.Kernel32, SetLastError=true, ExactSpelling=true, EntryPoint="RtlMoveMemory", CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern void CopyMemory(HandleRef destData, HandleRef srcData, int size); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, EntryPoint="GetDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntGetDC(HandleRef hWnd); public static IntPtr GetDC(HandleRef hWnd) { return System.Internal.HandleCollector.Add(IntGetDC(hWnd), SafeNativeMethods.CommonHandles.HDC); } [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, EntryPoint="DeleteDC", CharSet=CharSet.Auto)] private static extern bool IntDeleteDC(HandleRef hDC); public static bool DeleteDC(HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.GDI); return IntDeleteDC(hDC); } [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, EntryPoint="ReleaseDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern int IntReleaseDC(HandleRef hWnd, HandleRef hDC); public static int ReleaseDC(HandleRef hWnd, HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.HDC); return IntReleaseDC(hWnd, hDC); } #if false // Not currently used. [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern IntPtr GetModuleHandle(string modName); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true)] public static extern IntPtr GetProcessWindowStation(); [DllImport(ExternDll.Gdi32, SetLastError=true, EntryPoint="CreateDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntCreateDC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData); public static IntPtr CreateDC(String lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData) { return System.Internal.HandleCollector.Add(IntCreateDC(lpszDriverName, lpszDeviceName, lpszOutput, lpInitData), SafeNativeMethods.CommonHandles.HDC); } [DllImport(ExternDll.User32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern bool PeekMessage([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Ansi)] public static extern bool PeekMessageA([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Unicode)] public static extern bool PeekMessageW([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.Gdi32, SetLastError=true, EntryPoint="CreateIC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntCreateIC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData); public static IntPtr CreateIC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData) { return System.Internal.HandleCollector.Add(IntCreateIC(lpszDriverName, lpszDeviceName, lpszOutput, lpInitData), SafeNativeMethods.CommonHandles.HDC); } public static bool DeleteHDC(HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.HDC); return IntDeleteDC(hDC); } [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling = true)] public static extern IntPtr WindowFromDC( HandleRef hDC ); #endif [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, EntryPoint="CreateCompatibleDC", CharSet=CharSet.Auto)] private static extern IntPtr IntCreateCompatibleDC(HandleRef hDC); public static IntPtr CreateCompatibleDC(HandleRef hDC) { return System.Internal.HandleCollector.Add(IntCreateCompatibleDC(hDC), SafeNativeMethods.CommonHandles.GDI); } [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=CharSet.Auto)] public static extern IntPtr GetStockObject(int nIndex); [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetSystemDefaultLCID(); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetSystemMetrics(int nIndex); [DllImport(ExternDll.User32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern bool SystemParametersInfo(int uiAction, int uiParam, [In, Out] NativeMethods.NONCLIENTMETRICS pvParam, int fWinIni); [DllImport(ExternDll.User32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern bool SystemParametersInfo(int uiAction, int uiParam, [In, Out] SafeNativeMethods.LOGFONT pvParam, int fWinIni); [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetDeviceCaps(HandleRef hDC, int nIndex); [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=CharSet.Auto)] public static extern int GetObjectType(HandleRef hObject); // SECUNDONE : For some reason "PtrToStructure" requires super high permission.. put this // : assert here until we can get a resolution on this. // : this is ok as long as the lparam is not obtained from external code. [ReflectionPermission(SecurityAction.Assert, Unrestricted=true), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)] public static object PtrToStructure(IntPtr lparam, Type cls) { return Marshal.PtrToStructure(lparam, cls); } // SECUNDONE : For some reason "PtrToStructure" requires super high permission.. put this // : assert here until we can get a resolution on this. // : this is ok as long as the lparam is not obtained from external code. [ReflectionPermission(SecurityAction.Assert, Unrestricted=true), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)] public static void PtrToStructure(IntPtr lparam, object data) { Marshal.PtrToStructure(lparam, data); } [ComImport(), Guid("0000000C-0000-0000-C000-000000000046"), System.Runtime.InteropServices.InterfaceTypeAttribute(System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIUnknown)] public interface IStream { int Read( [In] IntPtr buf, [In] int len); int Write( [In] IntPtr buf, [In] int len); [return: MarshalAs(UnmanagedType.I8)] long Seek( [In, MarshalAs(UnmanagedType.I8)] long dlibMove, [In] int dwOrigin); void SetSize( [In, MarshalAs(UnmanagedType.I8)] long libNewSize); [return: MarshalAs(UnmanagedType.I8)] long CopyTo( [In, MarshalAs(UnmanagedType.Interface)] UnsafeNativeMethods.IStream pstm, [In, MarshalAs(UnmanagedType.I8)] long cb, [Out, MarshalAs(UnmanagedType.LPArray)] long[] pcbRead); void Commit( [In] int grfCommitFlags); void Revert(); void LockRegion( [In, MarshalAs(UnmanagedType.I8)] long libOffset, [In, MarshalAs(UnmanagedType.I8)] long cb, [In] int dwLockType); void UnlockRegion( [In, MarshalAs(UnmanagedType.I8)] long libOffset, [In, MarshalAs(UnmanagedType.I8)] long cb, [In] int dwLockType); void Stat( [In] IntPtr pStatstg, [In] int grfStatFlag); [return: MarshalAs(UnmanagedType.Interface)] UnsafeNativeMethods.IStream Clone(); } internal class ComStreamFromDataStream : IStream { protected Stream dataStream; // to support seeking ahead of the stream length... long virtualPosition = -1; internal ComStreamFromDataStream(Stream dataStream) { if (dataStream == null) throw new ArgumentNullException("dataStream"); this.dataStream = dataStream; } private void ActualizeVirtualPosition() { if (virtualPosition == -1) return; if (virtualPosition > dataStream.Length) dataStream.SetLength(virtualPosition); dataStream.Position = virtualPosition; virtualPosition = -1; } public virtual IStream Clone() { NotImplemented(); return null; } public virtual void Commit(int grfCommitFlags) { dataStream.Flush(); // Extend the length of the file if needed. ActualizeVirtualPosition(); } public virtual long CopyTo(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 virtual void Stat(IntPtr pstatstg, int grfStatFlag) { // GpStream has a partial implementation, but it's so partial rather // restrict it to use with GDI+ NotImplemented(); } 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; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- [assembly: System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode", Scope="member", Target="System.Drawing.UnsafeNativeMethods..ctor()")] namespace System.Drawing { using System.Runtime.InteropServices; using System; using System.Security.Permissions; using System.Collections; using System.IO; using System.Text; using System.Diagnostics.CodeAnalysis; [ System.Security.SuppressUnmanagedCodeSecurityAttribute() ] internal class UnsafeNativeMethods { [SuppressMessage("Microsoft.Security", "CA2118:ReviewSuppressUnmanagedCodeSecurityUsage")] [DllImport(ExternDll.Kernel32, SetLastError=true, ExactSpelling=true, EntryPoint="RtlMoveMemory", CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern void CopyMemory(HandleRef destData, HandleRef srcData, int size); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, EntryPoint="GetDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntGetDC(HandleRef hWnd); public static IntPtr GetDC(HandleRef hWnd) { return System.Internal.HandleCollector.Add(IntGetDC(hWnd), SafeNativeMethods.CommonHandles.HDC); } [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, EntryPoint="DeleteDC", CharSet=CharSet.Auto)] private static extern bool IntDeleteDC(HandleRef hDC); public static bool DeleteDC(HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.GDI); return IntDeleteDC(hDC); } [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, EntryPoint="ReleaseDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern int IntReleaseDC(HandleRef hWnd, HandleRef hDC); public static int ReleaseDC(HandleRef hWnd, HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.HDC); return IntReleaseDC(hWnd, hDC); } #if false // Not currently used. [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern IntPtr GetModuleHandle(string modName); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true)] public static extern IntPtr GetProcessWindowStation(); [DllImport(ExternDll.Gdi32, SetLastError=true, EntryPoint="CreateDC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntCreateDC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData); public static IntPtr CreateDC(String lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData) { return System.Internal.HandleCollector.Add(IntCreateDC(lpszDriverName, lpszDeviceName, lpszOutput, lpInitData), SafeNativeMethods.CommonHandles.HDC); } [DllImport(ExternDll.User32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern bool PeekMessage([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Ansi)] public static extern bool PeekMessageA([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Unicode)] public static extern bool PeekMessageW([In, Out] ref SafeNativeMethods.MSG msg, HandleRef hwnd, int msgMin, int msgMax, int remove); [DllImport(ExternDll.Gdi32, SetLastError=true, EntryPoint="CreateIC", CharSet=System.Runtime.InteropServices.CharSet.Auto)] private static extern IntPtr IntCreateIC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData); public static IntPtr CreateIC(string lpszDriverName, string lpszDeviceName, string lpszOutput, HandleRef /*DEVMODE*/ lpInitData) { return System.Internal.HandleCollector.Add(IntCreateIC(lpszDriverName, lpszDeviceName, lpszOutput, lpInitData), SafeNativeMethods.CommonHandles.HDC); } public static bool DeleteHDC(HandleRef hDC) { System.Internal.HandleCollector.Remove((IntPtr)hDC, SafeNativeMethods.CommonHandles.HDC); return IntDeleteDC(hDC); } [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling = true)] public static extern IntPtr WindowFromDC( HandleRef hDC ); #endif [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, EntryPoint="CreateCompatibleDC", CharSet=CharSet.Auto)] private static extern IntPtr IntCreateCompatibleDC(HandleRef hDC); public static IntPtr CreateCompatibleDC(HandleRef hDC) { return System.Internal.HandleCollector.Add(IntCreateCompatibleDC(hDC), SafeNativeMethods.CommonHandles.GDI); } [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=CharSet.Auto)] public static extern IntPtr GetStockObject(int nIndex); [DllImport(ExternDll.Kernel32, SetLastError=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetSystemDefaultLCID(); [DllImport(ExternDll.User32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetSystemMetrics(int nIndex); [DllImport(ExternDll.User32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern bool SystemParametersInfo(int uiAction, int uiParam, [In, Out] NativeMethods.NONCLIENTMETRICS pvParam, int fWinIni); [DllImport(ExternDll.User32, SetLastError=true, CharSet=CharSet.Auto, BestFitMapping=false)] public static extern bool SystemParametersInfo(int uiAction, int uiParam, [In, Out] SafeNativeMethods.LOGFONT pvParam, int fWinIni); [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Auto)] public static extern int GetDeviceCaps(HandleRef hDC, int nIndex); [DllImport(ExternDll.Gdi32, SetLastError=true, ExactSpelling=true, CharSet=CharSet.Auto)] public static extern int GetObjectType(HandleRef hObject); // SECUNDONE : For some reason "PtrToStructure" requires super high permission.. put this // : assert here until we can get a resolution on this. // : this is ok as long as the lparam is not obtained from external code. [ReflectionPermission(SecurityAction.Assert, Unrestricted=true), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)] public static object PtrToStructure(IntPtr lparam, Type cls) { return Marshal.PtrToStructure(lparam, cls); } // SECUNDONE : For some reason "PtrToStructure" requires super high permission.. put this // : assert here until we can get a resolution on this. // : this is ok as long as the lparam is not obtained from external code. [ReflectionPermission(SecurityAction.Assert, Unrestricted=true), SecurityPermission(SecurityAction.Assert, Flags=SecurityPermissionFlag.UnmanagedCode)] public static void PtrToStructure(IntPtr lparam, object data) { Marshal.PtrToStructure(lparam, data); } [ComImport(), Guid("0000000C-0000-0000-C000-000000000046"), System.Runtime.InteropServices.InterfaceTypeAttribute(System.Runtime.InteropServices.ComInterfaceType.InterfaceIsIUnknown)] public interface IStream { int Read( [In] IntPtr buf, [In] int len); int Write( [In] IntPtr buf, [In] int len); [return: MarshalAs(UnmanagedType.I8)] long Seek( [In, MarshalAs(UnmanagedType.I8)] long dlibMove, [In] int dwOrigin); void SetSize( [In, MarshalAs(UnmanagedType.I8)] long libNewSize); [return: MarshalAs(UnmanagedType.I8)] long CopyTo( [In, MarshalAs(UnmanagedType.Interface)] UnsafeNativeMethods.IStream pstm, [In, MarshalAs(UnmanagedType.I8)] long cb, [Out, MarshalAs(UnmanagedType.LPArray)] long[] pcbRead); void Commit( [In] int grfCommitFlags); void Revert(); void LockRegion( [In, MarshalAs(UnmanagedType.I8)] long libOffset, [In, MarshalAs(UnmanagedType.I8)] long cb, [In] int dwLockType); void UnlockRegion( [In, MarshalAs(UnmanagedType.I8)] long libOffset, [In, MarshalAs(UnmanagedType.I8)] long cb, [In] int dwLockType); void Stat( [In] IntPtr pStatstg, [In] int grfStatFlag); [return: MarshalAs(UnmanagedType.Interface)] UnsafeNativeMethods.IStream Clone(); } internal class ComStreamFromDataStream : IStream { protected Stream dataStream; // to support seeking ahead of the stream length... long virtualPosition = -1; internal ComStreamFromDataStream(Stream dataStream) { if (dataStream == null) throw new ArgumentNullException("dataStream"); this.dataStream = dataStream; } private void ActualizeVirtualPosition() { if (virtualPosition == -1) return; if (virtualPosition > dataStream.Length) dataStream.SetLength(virtualPosition); dataStream.Position = virtualPosition; virtualPosition = -1; } public virtual IStream Clone() { NotImplemented(); return null; } public virtual void Commit(int grfCommitFlags) { dataStream.Flush(); // Extend the length of the file if needed. ActualizeVirtualPosition(); } public virtual long CopyTo(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 virtual void Stat(IntPtr pstatstg, int grfStatFlag) { // GpStream has a partial implementation, but it's so partial rather // restrict it to use with GDI+ NotImplemented(); } 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; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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