Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Framework / MS / Internal / IO / Packaging / ByteStream.cs / 1305600 / ByteStream.cs
//------------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// Stream interface for manipulating data within a stream.
//
// History:
// 02/8/2005: twillie: Initial implementation.
//
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes; // for IStream
using System.Windows;
using MS.Win32; // for NativeMethods
using System.Security; // for marking critical methods
using System.Security.Permissions; // for elevations
namespace MS.Internal.IO.Packaging
{
///
/// Class for managing an COM IStream interface.
///
internal sealed class ByteStream : Stream
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
///
/// Constructs a ByteStream class from a supplied unmanaged stream with the specified access.
///
///
///
///
/// Critical - We are creating an instance of SecurityCriticalDataForSet with the supplied stream.
/// The caller of this constructor should be critical and trusted since we accept a stream
/// of data from them. The data is only critical for set since it was a stream the caller
/// originally had in the first place so they could get it again if they wanted it.
///
[SecurityCritical]
internal ByteStream(object underlyingStream, FileAccess openAccess)
{
SecuritySuppressedIStream stream = underlyingStream as SecuritySuppressedIStream;
Debug.Assert(stream != null);
_securitySuppressedIStream = new SecurityCriticalDataForSet(stream);
_access = openAccess;
// we only work for reading.
Debug.Assert(_access == FileAccess.Read);
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
///
/// Gets a value indicating whether the current stream supports reading.
///
public override bool CanRead
{
get
{
return (!StreamDisposed &&
(FileAccess.Read == (_access & FileAccess.Read) ||
FileAccess.ReadWrite == (_access & FileAccess.ReadWrite)));
}
}
///
/// Gets a value indicating whether the current stream supports seeking.
///
public override bool CanSeek
{
get
{
return (!StreamDisposed);
}
}
///
/// Gets a value indicating whether the current stream supports writing.
///
public override bool CanWrite
{
get
{
return false;
}
}
///
/// Gets the length in bytes of the stream.
///
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
public override long Length
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
CheckDisposedStatus();
if (!_isLengthInitialized)
{
System.Runtime.InteropServices.ComTypes.STATSTG streamStat;
// call Stat to get length back. STATFLAG_NONAME means string buffer
// is not populated.
_securitySuppressedIStream.Value.Stat(out streamStat, NativeMethods.STATFLAG_NONAME);
_isLengthInitialized = true;
_length = streamStat.cbSize;
}
Debug.Assert(_length > 0);
return _length;
}
}
///
/// Gets or sets the position within the current stream.
///
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
public override long Position
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
CheckDisposedStatus();
long seekPos = 0;
_securitySuppressedIStream.Value.Seek(0,
NativeMethods.STREAM_SEEK_CUR,
out seekPos);
return seekPos;
}
[SecurityCritical, SecurityTreatAsSafe]
set
{
CheckDisposedStatus();
if (!CanSeek)
{
throw new NotSupportedException(SR.Get(SRID.SetPositionNotSupported));
}
long seekPos = 0;
_securitySuppressedIStream.Value.Seek(value,
NativeMethods.STREAM_SEEK_SET,
out seekPos);
if (value != seekPos)
{
throw new IOException(SR.Get(SRID.SeekFailed));
}
}
}
#endregion Public Properties
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
public override void Flush()
{
// deliberate overidding noop
// do not want to do anything on a read-only stream
}
///
/// Sets the position within the current stream.
///
///
/// ByteStream relies on underlying COM interface to
/// validate offsets.
///
/// Offset byte count
/// Offset origin
/// The new position within the current stream.
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
[SecurityCritical, SecurityTreatAsSafe]
public override long Seek(long offset, SeekOrigin origin)
{
CheckDisposedStatus();
if (!CanSeek)
{
throw new NotSupportedException(SR.Get(SRID.SeekNotSupported));
}
long seekPos = 0;
int translatedSeekOrigin = 0;
switch (origin)
{
case SeekOrigin.Begin:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_SET;
if (0 > offset)
{
throw new ArgumentOutOfRangeException("offset",
SR.Get(SRID.SeekNegative));
}
break;
case SeekOrigin.Current:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_CUR;
break;
case SeekOrigin.End:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_END;
break;
default:
throw new System.ComponentModel.InvalidEnumArgumentException("origin",
(int)origin,
typeof(SeekOrigin));
}
_securitySuppressedIStream.Value.Seek(offset, translatedSeekOrigin, out seekPos);
return seekPos;
}
///
/// Sets the length of the current stream.
///
/// Not Supported in this implementation.
///
/// New length
public override void SetLength(long newLength)
{
throw new NotSupportedException(SR.Get(SRID.SetLengthNotSupported));
}
///
/// Reads a sequence of bytes from the current stream and advances the
/// position within the stream by the number of bytes read.
///
/// Read data buffer
/// Buffer start position
/// Number of bytes to read
/// Number of bytes actually read
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
[SecurityCritical, SecurityTreatAsSafe]
public override int Read(byte[] buffer, int offset, int count)
{
CheckDisposedStatus();
if (!CanRead)
{
throw new NotSupportedException(SR.Get(SRID.ReadNotSupported));
}
int read = 0;
// optimization: if we are being asked to read zero bytes, be done.
if (count == 0)
{
return read;
}
// count has to be positive number
if (0 > count)
{
throw new ArgumentOutOfRangeException("count",
SR.Get(SRID.ReadCountNegative));
}
// offset has to be a positive number
if (0 > offset)
{
throw new ArgumentOutOfRangeException("offset",
SR.Get(SRID.BufferOffsetNegative));
}
// make sure that we have a buffer that matches number of bytes we need to read
// since all values are > 0, there is no chance of overflow
if (!((buffer.Length > 0) && ((buffer.Length - offset) >= count)))
{
throw new ArgumentException(SR.Get(SRID.BufferTooSmall), "buffer");
}
// offset == 0 is the normal case
if (0 == offset)
{
_securitySuppressedIStream.Value.Read(buffer, count, out read);
}
// offset involved. Must be positive
else if (0 < offset)
{
// Read into local array and then copy it into the given buffer at
// the specified offset.
byte[] localBuffer = new byte[count];
_securitySuppressedIStream.Value.Read(localBuffer, count, out read);
if (read > 0)
{
Array.Copy(localBuffer, 0, buffer, offset, read);
}
}
// Negative offsets are not allowed and coverd above.
return read;
}
///
/// Writes a sequence of bytes to the current stream and advances the
/// current position within this stream by the number of bytes written.
///
/// Not Supported in this implementation.
///
/// Data buffer
/// Buffer write start position
/// Number of bytes to write
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException(SR.Get(SRID.WriteNotSupported));
}
///
/// Closes the current stream and releases any resources (such as
/// sockets and file handles) associated with the current stream.
///
public override void Close()
{
_disposed = true;
}
#endregion Public Methods
//-----------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
///
/// Check whether this Stream object is still valid. If not, thrown an
/// ObjectDisposedException.
///
internal void CheckDisposedStatus()
{
if (StreamDisposed)
throw new ObjectDisposedException(null, SR.Get(SRID.StreamObjectDisposed));
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Properties
///
/// Check whether this Stream object is still valid.
///
private bool StreamDisposed
{
get
{
return _disposed;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// This class does not control the life cycle of _securitySupressedIStream
// thus it should not dispose it when this class gets disposed
// the client code of this class should be the one that dispose _securitySupressedIStream
SecurityCriticalDataForSet _securitySuppressedIStream;
FileAccess _access;
long _length = 0;
bool _isLengthInitialized = false;
bool _disposed = false;
#endregion Private Fields
//-----------------------------------------------------
//
// Private Unmanaged Interfaces
//
//------------------------------------------------------
#region Private Unmanaged Interface imports
// ****CAUTION****: Be careful using this interface, because it suppresses
// the check for unmanaged code security permission. It is recommended
// that all instances of this interface also have "SecuritySuppressed" in
// its name to make it clear that it is a dangerous interface. Also, it
// is expected that each use of this interface be reviewed for security
// soundness.
[Guid("0000000c-0000-0000-C000-000000000046")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
[ComImport]
[System.Security.SuppressUnmanagedCodeSecurity]
[SecurityCritical(SecurityCriticalScope.Everything)]
public interface SecuritySuppressedIStream
{
// ISequentialStream portion
void Read([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1), Out] Byte[] pv, int cb, out int pcbRead);
void Write([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] Byte[] pv, int cb, out int pcbWritten);
// IStream portion
void Seek(long dlibMove, int dwOrigin, out long plibNewPosition);
void SetSize(long libNewSize);
void CopyTo(SecuritySuppressedIStream pstm, long cb, out long pcbRead, out long pcbWritten);
void Commit(int grfCommitFlags);
void Revert();
void LockRegion(long libOffset, long cb, int dwLockType);
void UnlockRegion(long libOffset, long cb, int dwLockType);
void Stat(out System.Runtime.InteropServices.ComTypes.STATSTG pstatstg, int grfStatFlag);
void Clone(out SecuritySuppressedIStream ppstm);
}
#endregion Private Unmanaged Interface imports
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// Stream interface for manipulating data within a stream.
//
// History:
// 02/8/2005: twillie: Initial implementation.
//
//-----------------------------------------------------------------------------
using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.ComTypes; // for IStream
using System.Windows;
using MS.Win32; // for NativeMethods
using System.Security; // for marking critical methods
using System.Security.Permissions; // for elevations
namespace MS.Internal.IO.Packaging
{
///
/// Class for managing an COM IStream interface.
///
internal sealed class ByteStream : Stream
{
//-----------------------------------------------------
//
// Constructors
//
//-----------------------------------------------------
#region Constructors
///
/// Constructs a ByteStream class from a supplied unmanaged stream with the specified access.
///
///
///
///
/// Critical - We are creating an instance of SecurityCriticalDataForSet with the supplied stream.
/// The caller of this constructor should be critical and trusted since we accept a stream
/// of data from them. The data is only critical for set since it was a stream the caller
/// originally had in the first place so they could get it again if they wanted it.
///
[SecurityCritical]
internal ByteStream(object underlyingStream, FileAccess openAccess)
{
SecuritySuppressedIStream stream = underlyingStream as SecuritySuppressedIStream;
Debug.Assert(stream != null);
_securitySuppressedIStream = new SecurityCriticalDataForSet(stream);
_access = openAccess;
// we only work for reading.
Debug.Assert(_access == FileAccess.Read);
}
#endregion Constructors
//------------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
#region Public Properties
///
/// Gets a value indicating whether the current stream supports reading.
///
public override bool CanRead
{
get
{
return (!StreamDisposed &&
(FileAccess.Read == (_access & FileAccess.Read) ||
FileAccess.ReadWrite == (_access & FileAccess.ReadWrite)));
}
}
///
/// Gets a value indicating whether the current stream supports seeking.
///
public override bool CanSeek
{
get
{
return (!StreamDisposed);
}
}
///
/// Gets a value indicating whether the current stream supports writing.
///
public override bool CanWrite
{
get
{
return false;
}
}
///
/// Gets the length in bytes of the stream.
///
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
public override long Length
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
CheckDisposedStatus();
if (!_isLengthInitialized)
{
System.Runtime.InteropServices.ComTypes.STATSTG streamStat;
// call Stat to get length back. STATFLAG_NONAME means string buffer
// is not populated.
_securitySuppressedIStream.Value.Stat(out streamStat, NativeMethods.STATFLAG_NONAME);
_isLengthInitialized = true;
_length = streamStat.cbSize;
}
Debug.Assert(_length > 0);
return _length;
}
}
///
/// Gets or sets the position within the current stream.
///
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
public override long Position
{
[SecurityCritical, SecurityTreatAsSafe]
get
{
CheckDisposedStatus();
long seekPos = 0;
_securitySuppressedIStream.Value.Seek(0,
NativeMethods.STREAM_SEEK_CUR,
out seekPos);
return seekPos;
}
[SecurityCritical, SecurityTreatAsSafe]
set
{
CheckDisposedStatus();
if (!CanSeek)
{
throw new NotSupportedException(SR.Get(SRID.SetPositionNotSupported));
}
long seekPos = 0;
_securitySuppressedIStream.Value.Seek(value,
NativeMethods.STREAM_SEEK_SET,
out seekPos);
if (value != seekPos)
{
throw new IOException(SR.Get(SRID.SeekFailed));
}
}
}
#endregion Public Properties
//------------------------------------------------------
//
// Public Methods
//
//------------------------------------------------------
#region Public Methods
public override void Flush()
{
// deliberate overidding noop
// do not want to do anything on a read-only stream
}
///
/// Sets the position within the current stream.
///
///
/// ByteStream relies on underlying COM interface to
/// validate offsets.
///
/// Offset byte count
/// Offset origin
/// The new position within the current stream.
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
[SecurityCritical, SecurityTreatAsSafe]
public override long Seek(long offset, SeekOrigin origin)
{
CheckDisposedStatus();
if (!CanSeek)
{
throw new NotSupportedException(SR.Get(SRID.SeekNotSupported));
}
long seekPos = 0;
int translatedSeekOrigin = 0;
switch (origin)
{
case SeekOrigin.Begin:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_SET;
if (0 > offset)
{
throw new ArgumentOutOfRangeException("offset",
SR.Get(SRID.SeekNegative));
}
break;
case SeekOrigin.Current:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_CUR;
break;
case SeekOrigin.End:
translatedSeekOrigin = NativeMethods.STREAM_SEEK_END;
break;
default:
throw new System.ComponentModel.InvalidEnumArgumentException("origin",
(int)origin,
typeof(SeekOrigin));
}
_securitySuppressedIStream.Value.Seek(offset, translatedSeekOrigin, out seekPos);
return seekPos;
}
///
/// Sets the length of the current stream.
///
/// Not Supported in this implementation.
///
/// New length
public override void SetLength(long newLength)
{
throw new NotSupportedException(SR.Get(SRID.SetLengthNotSupported));
}
///
/// Reads a sequence of bytes from the current stream and advances the
/// position within the stream by the number of bytes read.
///
/// Read data buffer
/// Buffer start position
/// Number of bytes to read
/// Number of bytes actually read
///
/// Critical - The stream object is marked with SUC and SecurityCritical.
/// TreatAsSafe - The caller already has access to the stream. Also, in order to
/// have created this class the caller would have had to have had
/// permission to create the unmanaged code stream already.
///
[SecurityCritical, SecurityTreatAsSafe]
public override int Read(byte[] buffer, int offset, int count)
{
CheckDisposedStatus();
if (!CanRead)
{
throw new NotSupportedException(SR.Get(SRID.ReadNotSupported));
}
int read = 0;
// optimization: if we are being asked to read zero bytes, be done.
if (count == 0)
{
return read;
}
// count has to be positive number
if (0 > count)
{
throw new ArgumentOutOfRangeException("count",
SR.Get(SRID.ReadCountNegative));
}
// offset has to be a positive number
if (0 > offset)
{
throw new ArgumentOutOfRangeException("offset",
SR.Get(SRID.BufferOffsetNegative));
}
// make sure that we have a buffer that matches number of bytes we need to read
// since all values are > 0, there is no chance of overflow
if (!((buffer.Length > 0) && ((buffer.Length - offset) >= count)))
{
throw new ArgumentException(SR.Get(SRID.BufferTooSmall), "buffer");
}
// offset == 0 is the normal case
if (0 == offset)
{
_securitySuppressedIStream.Value.Read(buffer, count, out read);
}
// offset involved. Must be positive
else if (0 < offset)
{
// Read into local array and then copy it into the given buffer at
// the specified offset.
byte[] localBuffer = new byte[count];
_securitySuppressedIStream.Value.Read(localBuffer, count, out read);
if (read > 0)
{
Array.Copy(localBuffer, 0, buffer, offset, read);
}
}
// Negative offsets are not allowed and coverd above.
return read;
}
///
/// Writes a sequence of bytes to the current stream and advances the
/// current position within this stream by the number of bytes written.
///
/// Not Supported in this implementation.
///
/// Data buffer
/// Buffer write start position
/// Number of bytes to write
public override void Write(byte[] buffer, int offset, int count)
{
throw new NotSupportedException(SR.Get(SRID.WriteNotSupported));
}
///
/// Closes the current stream and releases any resources (such as
/// sockets and file handles) associated with the current stream.
///
public override void Close()
{
_disposed = true;
}
#endregion Public Methods
//-----------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
#region Internal Methods
///
/// Check whether this Stream object is still valid. If not, thrown an
/// ObjectDisposedException.
///
internal void CheckDisposedStatus()
{
if (StreamDisposed)
throw new ObjectDisposedException(null, SR.Get(SRID.StreamObjectDisposed));
}
#endregion Internal Methods
//-----------------------------------------------------
//
// Internal Methods
//
//-----------------------------------------------------
#region Internal Properties
///
/// Check whether this Stream object is still valid.
///
private bool StreamDisposed
{
get
{
return _disposed;
}
}
#endregion Internal Properties
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
#region Private Fields
// This class does not control the life cycle of _securitySupressedIStream
// thus it should not dispose it when this class gets disposed
// the client code of this class should be the one that dispose _securitySupressedIStream
SecurityCriticalDataForSet _securitySuppressedIStream;
FileAccess _access;
long _length = 0;
bool _isLengthInitialized = false;
bool _disposed = false;
#endregion Private Fields
//-----------------------------------------------------
//
// Private Unmanaged Interfaces
//
//------------------------------------------------------
#region Private Unmanaged Interface imports
// ****CAUTION****: Be careful using this interface, because it suppresses
// the check for unmanaged code security permission. It is recommended
// that all instances of this interface also have "SecuritySuppressed" in
// its name to make it clear that it is a dangerous interface. Also, it
// is expected that each use of this interface be reviewed for security
// soundness.
[Guid("0000000c-0000-0000-C000-000000000046")]
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
[ComImport]
[System.Security.SuppressUnmanagedCodeSecurity]
[SecurityCritical(SecurityCriticalScope.Everything)]
public interface SecuritySuppressedIStream
{
// ISequentialStream portion
void Read([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1), Out] Byte[] pv, int cb, out int pcbRead);
void Write([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] Byte[] pv, int cb, out int pcbWritten);
// IStream portion
void Seek(long dlibMove, int dwOrigin, out long plibNewPosition);
void SetSize(long libNewSize);
void CopyTo(SecuritySuppressedIStream pstm, long cb, out long pcbRead, out long pcbWritten);
void Commit(int grfCommitFlags);
void Revert();
void LockRegion(long libOffset, long cb, int dwLockType);
void UnlockRegion(long libOffset, long cb, int dwLockType);
void Stat(out System.Runtime.InteropServices.ComTypes.STATSTG pstatstg, int grfStatFlag);
void Clone(out SecuritySuppressedIStream ppstm);
}
#endregion Private Unmanaged Interface imports
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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