Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Zip / ZipIORawDataFileBlock.cs / 1305600 / ZipIORawDataFileBlock.cs
//------------------------------------------------------------------------------ //------------- *** WARNING *** //------------- This file is part of a legally monitored development project. //------------- Do not check in changes to this project. Do not raid bugs on this //------------- code in the main PS database. Do not contact the owner of this //------------- code directly. Contact the legal team at �ZSLegal� for assistance. //------------- *** WARNING *** //----------------------------------------------------------------------------- //----------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // This is an internal class that enables interactions with Zip archives // for OPC scenarios // // History: // 11/19/2004: IgorBel: Initial creation. // //----------------------------------------------------------------------------- using System; using System.IO; using System.Diagnostics; using System.Collections; using System.Runtime.Serialization; using System.Windows; using MS.Internal.IO.Packaging; // for PackagingUtilities namespace MS.Internal.IO.Zip { internal class ZipIORawDataFileBlock : IZipIOBlock { //------------------------------------------------------ // // Public Properties // //----------------------------------------------------- // standard IZipIOBlock functionality public long Offset { get { return _offset; } } public long Size { get { return _size; } } public bool GetDirtyFlag(bool closingFlag) { return _dirtyFlag; } //------------------------------------------------------ // // Public Methods // //------------------------------------------------------ public void Move(long shiftSize) { if (shiftSize != 0) { checked{_offset +=shiftSize;} _dirtyFlag = true; Debug.Assert(_offset >=0); } } public void Save() { if(GetDirtyFlag(true)) // in case we do not know whether we are closing or not we should think we are closing as a more conservative approach { // we need to move the whole block to the new position long moveBlockSourceOffset = _persistedOffset; long moveBlockSize = _size; long moveBlockTargetOffset = _offset; if (_cachePrefixStream != null) { // if we have something in cache we only should move whatever isn't cached checked{moveBlockSourceOffset += _cachePrefixStream.Length;} checked{moveBlockTargetOffset += _cachePrefixStream.Length;} checked{moveBlockSize -= _cachePrefixStream.Length;} Debug.Assert(moveBlockSize >=0); } _blockManager.MoveData(moveBlockSourceOffset, moveBlockTargetOffset, moveBlockSize); // only after data on disk was moved it is safe to flush the cached prefix buffer if (_cachePrefixStream != null) { if (_blockManager.Stream.Position != _offset) { // we need to seek _blockManager.Stream.Seek(_offset, SeekOrigin.Begin); } Debug.Assert(_cachePrefixStream.Length > 0); // should be taken care of by the constructor // and PreSaveNotification // we do not need to flush here because Block Manager is responsible for flushing // this in it's Save method _cachePrefixStream.WriteToStream(_blockManager.Stream); // we can free the memory _cachePrefixStream.Close(); _cachePrefixStream = null; } // we are not shifted between on disk image and in memory image any more _persistedOffset = _offset; _dirtyFlag = false; } } public void UpdateReferences(bool closingFlag) { // this block doesn't have external references so there is nothing we need to do here } public PreSaveNotificationScanControlInstruction PreSaveNotification(long offset, long size) { return ZipIOBlockManager.CommonPreSaveNotificationHandler( _blockManager.Stream, offset, size, _persistedOffset, _size, ref _cachePrefixStream); } //----------------------------------------------------- // // Internal Properties // //------------------------------------------------------ internal long DiskImageShift { get { return _offset - _persistedOffset; } } //----------------------------------------------------- // // Internal Methods // //----------------------------------------------------- internal static ZipIORawDataFileBlock Assign(ZipIOBlockManager blockManager, long offset, long size) { if (size <= 0) { throw new ArgumentOutOfRangeException ("size"); } if (offset < 0) { throw new ArgumentOutOfRangeException ("offset"); } ZipIORawDataFileBlock block = new ZipIORawDataFileBlock(blockManager); block._persistedOffset = offset; block._offset = offset; block._size = size; return block; } internal bool DiskImageContains(IZipIOBlock block) { checked { Debug.Assert(block != null); Debug.Assert(block.Offset >=0); Debug.Assert(block.Size > 0); return (_persistedOffset <= block.Offset) && (_persistedOffset + _size >= block.Offset +block.Size); } } internal bool DiskImageContains(long offset) { checked { Debug.Assert(offset >=0); return (_persistedOffset <= offset) && (_persistedOffset + _size > offset); } } internal void SplitIntoPrefixSuffix(IZipIOBlock block, out ZipIORawDataFileBlock prefixBlock, out ZipIORawDataFileBlock suffixBlock) { // assert that current's block cache isn't loaded, if it is // we probably missed an opportunity to used this cache in order to parse the new block // and it might be based on the overriden data on disk // This block can only be in cached state as a part of single BlockManager.Save execution. // It can NOT be in cached state prior to BlockManager.Save function entry or after // BlockManager.Save execution completed Debug.Assert(_cachePrefixStream == null); // Assert that block is containe inside the current raw block Debug.Assert(DiskImageContains(block)); checked { prefixBlock = null; suffixBlock = null; if (block.Offset > _persistedOffset) { // we have a new non empty prefix; long newBlockOffset = _persistedOffset; long newBlockSize = block.Offset - _persistedOffset; prefixBlock = Assign(_blockManager, newBlockOffset , newBlockSize); } if (block.Offset + block.Size < _persistedOffset + _size) { // we have a new non empty suffix; long newBlockOffset = block.Offset + block.Size; long newBlockSize = _persistedOffset + _size - newBlockOffset; suffixBlock = Assign(_blockManager, newBlockOffset, newBlockSize); } } } //----------------------------------------------------- // // Private Methods // //------------------------------------------------------ private ZipIORawDataFileBlock(ZipIOBlockManager blockManager) { _blockManager = blockManager; } //----------------------------------------------------- // // Private Members // //------------------------------------------------------ private SparseMemoryStream _cachePrefixStream = null; private ZipIOBlockManager _blockManager; private long _persistedOffset; private long _offset; private long _size; private bool _dirtyFlag; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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