Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Packaging / CompoundFile / CompoundFileReference.cs / 1305600 / 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 using MS.Internal.WindowsBase; 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. 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