Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Base / MS / Internal / IO / Packaging / CompoundFile / CompoundFileReference.cs / 1 / CompoundFileReference.cs
//------------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// Implementation of the CompoundFileReference base class.
//
// History:
// 03/31/2003: BruceMac: Created (from ContainerReference.cs)
// 04/08/2003: BruceMac: Made into abstract base class.
// 05/20/2003: RogerCh: Ported to WCP tree. Split CompoundFileSubStreamReference.cs
// (2 classes) into individual files for ByteRange and Index
// reference.
// 08/11/2003: LGolding: Fix Bug 864168 (some of BruceMac's bug fixes were lost
// in port to WCP tree).
//
// Notes:
// Persistence of specific classes is mostly hard-coded in this base class because
// the persistence must follow a shared binary implementation with Office. It is
// also intentionally not polymorphic because we don't allow arbitrary subclasses
// to participate.
//-----------------------------------------------------------------------------
using System;
using System.Collections.Specialized; // for StringCollection class
using System.IO;
using System.Diagnostics; // for Debug.Assert
using System.Windows; // for SR error message lookup
namespace MS.Internal.IO.Packaging.CompoundFile
{
///
/// Logical reference to a portion of a container
///
///
/// Use this class to represent a logical reference to a portion of a container such as a stream
/// Note that a CompoundFileReference is not natively tied to any specific container. This lack of context allows
/// the developer freedom to create the reference in the absence of the container, or to have the reference
/// refer to any one of multiple containers having a similar format.
///
internal abstract class CompoundFileReference: IComparable
{
#region Enums
///
/// Reference component types
///
///
/// These are only used for serialization
///
private enum RefComponentType : int
{
///
/// Stream component
///
Stream = 0,
///
/// Storage component
///
Storage = 1,
};
#endregion
#region Abstracts
///
/// Full name of the stream or storage this reference refers to (see StreamInfo and StorageInfo)
///
abstract public string FullName {get;}
#endregion
#region IComparable
///
/// This is not implemented - it exists as a reminder to authors of subclasses that they must implement this interface
///
/// ignored
int IComparable.CompareTo(object ob)
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return 0;
}
#endregion
#region Operators
/// Compare for equality
/// the CompoundFileReference to compare to
public override bool Equals(object o)
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return false;
}
/// Returns an integer suitable for including this object in a hash table
public override int GetHashCode()
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return 0;
}
#endregion
#region Persistence
/// Save to a stream
/// reference to save
/// The BinaryWriter to persist this object to.
/// This method will alter the stream pointer of the underlying stream as a side effect.
/// Passing null simply calculates how many bytes would be written.
/// number of bytes written including any padding
static internal int Save(CompoundFileReference reference, BinaryWriter writer)
{
int bytes = 0;
// NOTE: Our RefComponentType must be written by our caller
bool calcOnly = (writer == null);
// what are we dealing with here?
CompoundFileStreamReference streamReference = reference as CompoundFileStreamReference;
if ((streamReference == null) && (!(reference is CompoundFileStorageReference)))
throw new ArgumentException(SR.Get(SRID.UnknownReferenceSerialize), "reference");
// first parse the path into strings
string[] segments = ContainerUtilities.ConvertBackSlashPathToStringArrayPath(reference.FullName);
int entries = segments.Length;
// write the count
if (!calcOnly)
writer.Write( entries );
bytes += ContainerUtilities.Int32Size;
// write the segments - if we are dealing with a stream entry, don't write the last "segment"
// because it is in fact a stream name
for (int i = 0; i < segments.Length - (streamReference == null ? 0 : 1); i++)
{
if (!calcOnly)
{
writer.Write( (Int32)RefComponentType.Storage );
}
bytes += ContainerUtilities.Int32Size;
bytes += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(writer, segments[i]);
}
if (streamReference != null)
{
// we are responsible for the prefix
if (!calcOnly)
{
writer.Write( (Int32)RefComponentType.Stream );
}
bytes += ContainerUtilities.Int32Size;
// write the stream name
bytes += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(writer, segments[segments.Length - 1]);
}
return bytes;
}
///
/// Deserialize from the given stream
///
/// the BinaryReader to deserialize from with the seek pointer at the beginning of the container reference
/// bytes consumed from the stream
///
/// Side effect of change the stream pointer
///
/// Throws a FileFormatException if any formatting errors are encountered
internal static CompoundFileReference Load(BinaryReader reader, out int bytesRead)
{
ContainerUtilities.CheckAgainstNull( reader, "reader" );
bytesRead = 0; // running count of how much we've read - sanity check
// create the TypeMap
// reconstitute ourselves from the given BinaryReader
// in this version, the next Int32 is the number of entries
Int32 entryCount = reader.ReadInt32();
bytesRead += ContainerUtilities.Int32Size;
// EntryCount of zero indicates the root storage.
if (entryCount < 0)
throw new FileFormatException(
SR.Get(SRID.CFRCorrupt));
// need a temp collection because we don't know what we're dealing with until a non-storage component
// type is encountered
StringCollection storageList = null;
String streamName = null;
// loop through the entries - accumulating strings until we know what kind of object
// we ultimately need
int byteLength; // reusable
while (entryCount > 0)
{
// first Int32 tells us what kind of component this entry represents
RefComponentType refType = (RefComponentType)reader.ReadInt32();
bytesRead += ContainerUtilities.Int32Size;
switch (refType)
{
case RefComponentType.Storage:
{
if (streamName != null)
throw new FileFormatException(
SR.Get(SRID.CFRCorruptStgFollowStm));
if (storageList == null)
storageList = new StringCollection();
String str = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out byteLength);
bytesRead += byteLength;
storageList.Add(str);
} break;
case RefComponentType.Stream:
{
if (streamName != null)
throw new FileFormatException(
SR.Get(SRID.CFRCorruptMultiStream));
streamName = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out byteLength);
bytesRead += byteLength;
} break;
// we don't handle these types yet
default:
throw new FileFormatException(
SR.Get(SRID.UnknownReferenceComponentType));
}
--entryCount;
}
CompoundFileReference newRef = null;
// stream or storage?
if (streamName == null)
{
newRef = new CompoundFileStorageReference(
ContainerUtilities.ConvertStringArrayPathToBackSlashPath(storageList));
}
else
newRef = new CompoundFileStreamReference(
ContainerUtilities.ConvertStringArrayPathToBackSlashPath(storageList, streamName));
return newRef;
}
#endregion
}
}
// 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:
// Implementation of the CompoundFileReference base class.
//
// History:
// 03/31/2003: BruceMac: Created (from ContainerReference.cs)
// 04/08/2003: BruceMac: Made into abstract base class.
// 05/20/2003: RogerCh: Ported to WCP tree. Split CompoundFileSubStreamReference.cs
// (2 classes) into individual files for ByteRange and Index
// reference.
// 08/11/2003: LGolding: Fix Bug 864168 (some of BruceMac's bug fixes were lost
// in port to WCP tree).
//
// Notes:
// Persistence of specific classes is mostly hard-coded in this base class because
// the persistence must follow a shared binary implementation with Office. It is
// also intentionally not polymorphic because we don't allow arbitrary subclasses
// to participate.
//-----------------------------------------------------------------------------
using System;
using System.Collections.Specialized; // for StringCollection class
using System.IO;
using System.Diagnostics; // for Debug.Assert
using System.Windows; // for SR error message lookup
namespace MS.Internal.IO.Packaging.CompoundFile
{
///
/// Logical reference to a portion of a container
///
///
/// Use this class to represent a logical reference to a portion of a container such as a stream
/// Note that a CompoundFileReference is not natively tied to any specific container. This lack of context allows
/// the developer freedom to create the reference in the absence of the container, or to have the reference
/// refer to any one of multiple containers having a similar format.
///
internal abstract class CompoundFileReference: IComparable
{
#region Enums
///
/// Reference component types
///
///
/// These are only used for serialization
///
private enum RefComponentType : int
{
///
/// Stream component
///
Stream = 0,
///
/// Storage component
///
Storage = 1,
};
#endregion
#region Abstracts
///
/// Full name of the stream or storage this reference refers to (see StreamInfo and StorageInfo)
///
abstract public string FullName {get;}
#endregion
#region IComparable
///
/// This is not implemented - it exists as a reminder to authors of subclasses that they must implement this interface
///
/// ignored
int IComparable.CompareTo(object ob)
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return 0;
}
#endregion
#region Operators
/// Compare for equality
/// the CompoundFileReference to compare to
public override bool Equals(object o)
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return false;
}
/// Returns an integer suitable for including this object in a hash table
public override int GetHashCode()
{
// this must be implemented by our inheritors
Debug.Assert(false, "subclasses must override this method");
return 0;
}
#endregion
#region Persistence
/// Save to a stream
/// reference to save
/// The BinaryWriter to persist this object to.
/// This method will alter the stream pointer of the underlying stream as a side effect.
/// Passing null simply calculates how many bytes would be written.
/// number of bytes written including any padding
static internal int Save(CompoundFileReference reference, BinaryWriter writer)
{
int bytes = 0;
// NOTE: Our RefComponentType must be written by our caller
bool calcOnly = (writer == null);
// what are we dealing with here?
CompoundFileStreamReference streamReference = reference as CompoundFileStreamReference;
if ((streamReference == null) && (!(reference is CompoundFileStorageReference)))
throw new ArgumentException(SR.Get(SRID.UnknownReferenceSerialize), "reference");
// first parse the path into strings
string[] segments = ContainerUtilities.ConvertBackSlashPathToStringArrayPath(reference.FullName);
int entries = segments.Length;
// write the count
if (!calcOnly)
writer.Write( entries );
bytes += ContainerUtilities.Int32Size;
// write the segments - if we are dealing with a stream entry, don't write the last "segment"
// because it is in fact a stream name
for (int i = 0; i < segments.Length - (streamReference == null ? 0 : 1); i++)
{
if (!calcOnly)
{
writer.Write( (Int32)RefComponentType.Storage );
}
bytes += ContainerUtilities.Int32Size;
bytes += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(writer, segments[i]);
}
if (streamReference != null)
{
// we are responsible for the prefix
if (!calcOnly)
{
writer.Write( (Int32)RefComponentType.Stream );
}
bytes += ContainerUtilities.Int32Size;
// write the stream name
bytes += ContainerUtilities.WriteByteLengthPrefixedDWordPaddedUnicodeString(writer, segments[segments.Length - 1]);
}
return bytes;
}
///
/// Deserialize from the given stream
///
/// the BinaryReader to deserialize from with the seek pointer at the beginning of the container reference
/// bytes consumed from the stream
///
/// Side effect of change the stream pointer
///
/// Throws a FileFormatException if any formatting errors are encountered
internal static CompoundFileReference Load(BinaryReader reader, out int bytesRead)
{
ContainerUtilities.CheckAgainstNull( reader, "reader" );
bytesRead = 0; // running count of how much we've read - sanity check
// create the TypeMap
// reconstitute ourselves from the given BinaryReader
// in this version, the next Int32 is the number of entries
Int32 entryCount = reader.ReadInt32();
bytesRead += ContainerUtilities.Int32Size;
// EntryCount of zero indicates the root storage.
if (entryCount < 0)
throw new FileFormatException(
SR.Get(SRID.CFRCorrupt));
// need a temp collection because we don't know what we're dealing with until a non-storage component
// type is encountered
StringCollection storageList = null;
String streamName = null;
// loop through the entries - accumulating strings until we know what kind of object
// we ultimately need
int byteLength; // reusable
while (entryCount > 0)
{
// first Int32 tells us what kind of component this entry represents
RefComponentType refType = (RefComponentType)reader.ReadInt32();
bytesRead += ContainerUtilities.Int32Size;
switch (refType)
{
case RefComponentType.Storage:
{
if (streamName != null)
throw new FileFormatException(
SR.Get(SRID.CFRCorruptStgFollowStm));
if (storageList == null)
storageList = new StringCollection();
String str = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out byteLength);
bytesRead += byteLength;
storageList.Add(str);
} break;
case RefComponentType.Stream:
{
if (streamName != null)
throw new FileFormatException(
SR.Get(SRID.CFRCorruptMultiStream));
streamName = ContainerUtilities.ReadByteLengthPrefixedDWordPaddedUnicodeString(reader, out byteLength);
bytesRead += byteLength;
} break;
// we don't handle these types yet
default:
throw new FileFormatException(
SR.Get(SRID.UnknownReferenceComponentType));
}
--entryCount;
}
CompoundFileReference newRef = null;
// stream or storage?
if (streamName == null)
{
newRef = new CompoundFileStorageReference(
ContainerUtilities.ConvertStringArrayPathToBackSlashPath(storageList));
}
else
newRef = new CompoundFileStreamReference(
ContainerUtilities.ConvertStringArrayPathToBackSlashPath(storageList, streamName));
return newRef;
}
#endregion
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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