Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / MS / Internal / IO / Zip / ZipArchive.cs / 1305600 / ZipArchive.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.Globalization;
using System.Runtime.Serialization;
using System.Windows;
using MS.Internal.WindowsBase;
namespace MS.Internal.IO.Zip
{
///
/// This is the main clas of the ZIP IO internal APIs. It has 2 stsatic constructors
/// OpenOnFile and OpenOnStream. It provides client app with ability to manipulate
/// a Zip Archive (create, open, open/add/delete file items).
///
internal sealed class ZipArchive : IDisposable
{
//------------------------------------------------------
//
// Public Members
//
//-----------------------------------------------------
// None
//------------------------------------------------------
//
// Internal Constructors
//
//------------------------------------------------------
// None
//-----------------------------------------------------
//
// Internal API Methods (although these methods are marked as
// Internal, they are part of the internal ZIP IO API surface
//
//------------------------------------------------------
///
/// Static constructor File based constructor. all parameteres are obvious.
/// This constructor wil open the file in requested mode, and it will not do any futher parsing.
///
/// In the case of Create/CreateNew, it will also prebuild in cached in-memory
/// EndOfCentralDirectoryRecord (which is a minimal zip file requirement), so that if user
/// chooses to close right after he will get a file with just EndOfCentralDirectoryRecord.
///
internal static ZipArchive OpenOnFile(string path, FileMode mode, FileAccess access, FileShare share, bool streaming)
{
if (mode == FileMode.OpenOrCreate || mode == FileMode.Open)
{
// for OpenOrCreate cases we need to check whether it is an exisiting file of size 0.
// Files of size 0 are onsidered invalid ZipArchives. If we skip this check here, later we wouldn't be able to distinguish
// between brand new file being created as a result of OpenOrCreate mode, or old 0 length file being open as a result of
// OpenOrCreate mode.
FileInfo fileInfo = new FileInfo(path);
if (fileInfo.Exists && (fileInfo.Length == 0))
{
throw new FileFormatException(SR.Get(SRID.ZipZeroSizeFileIsNotValidArchive));
}
}
ZipArchive archive = null;
FileStream archiveStream = null;
// We would like to run initialization after openning stream in try/catch block
// so that if anything goes wrong we can close the stream (release file handler)
try
{
archiveStream = new FileStream(path, mode, access, share, 4096, streaming);
ValidateModeAccessShareStreaming(archiveStream, mode, access, share, streaming);
archive = new ZipArchive(archiveStream, mode, access, streaming, true);
}
catch
{
if (archiveStream != null)
{
archiveStream.Close();
}
throw;
}
return archive;
}
///
/// Static constructor Stream based constructor. all parameteres are obvious.
/// This constructor wil not do any futher parsing.
///
/// In the case of Create/CreateNew, it will also prebuild in cached in-memory
/// EndOfCentralDirectoryRecord (which is a minimal zip file requirement), so that if user
/// chooses to close right after he will get a file with just EndOfCentralDirectoryRecord.
///
internal static ZipArchive OpenOnStream(Stream stream, FileMode mode, FileAccess access, bool streaming)
{
// we can assume FileShare.None, as there is absolutely nothing we can do
// about other people working with the underlying storage
ValidateModeAccessShareStreaming(stream, mode, access, FileShare.None, streaming);
if (stream.CanSeek)
{
bool emptyStream = (stream.Length == 0);
switch (mode)
{
// for Open cases we need to check whether it is an existing file of size 0.
// Streams of size 0 are considered invalid ZipArchives.
case FileMode.Open:
if (emptyStream)
{
throw new FileFormatException(SR.Get(SRID.ZipZeroSizeFileIsNotValidArchive));
}
break;
// for Create cases, we need to check if the stream is empty or not
case FileMode.CreateNew:
if (!emptyStream)
{
throw new IOException(SR.Get(SRID.CreateNewOnNonEmptyStream));
}
break;
case FileMode.Create:
if (!emptyStream)
{
// discard existing data
stream.SetLength(0);
}
break;
}
}
return new ZipArchive(stream, mode, access, streaming, false);
}
///
/// This method will result in a complete parsing of the EndOfCentralDirectory
/// and CentralDirectory records (if it hasn't been done yet).
/// After that (assuming no duplicates were found). It will create in appropriate
/// in memory Local FileHeaders and Central Directory Headers.
///
internal ZipFileInfo AddFile(string zipFileName, CompressionMethodEnum compressionMethod, DeflateOptionEnum deflateOption)
{
CheckDisposed();
if (_openAccess == FileAccess.Read)
{
throw new InvalidOperationException(SR.Get(SRID.CanNotWriteInReadOnlyMode));
}
// Validate parameteres
zipFileName = ZipIOBlockManager.ValidateNormalizeFileName(zipFileName);
if ((compressionMethod != CompressionMethodEnum.Stored) &&
(compressionMethod != CompressionMethodEnum.Deflated))
{
throw new ArgumentOutOfRangeException("compressionMethod");
}
// non-contiguous range requires more complex test
if (deflateOption < DeflateOptionEnum.Normal || (
deflateOption > DeflateOptionEnum.SuperFast && deflateOption != DeflateOptionEnum.None))
{
throw new ArgumentOutOfRangeException("deflateOption");
}
// Check for duplicates ,
if (FileExists(zipFileName))
{
throw new System.InvalidOperationException(SR.Get(SRID.AttemptedToCreateDuplicateFileName));
}
// Create Local File Block through Block Manager
ZipIOLocalFileBlock fileBlock = _blockManager.CreateLocalFileBlock(zipFileName, compressionMethod, deflateOption);
//build new ZipFileInfo and add reference to the collection, so we can keep track of the instances of the ZipFileInfo,
// that were given out and invalidate any collection that was returned on GetFiles calls
ZipFileInfo zipFileInfo = new ZipFileInfo(this, fileBlock);
ZipFileInfoDictionary.Add(zipFileInfo.Name, zipFileInfo);
return zipFileInfo;
}
///
/// This method will result in a complete parsing of the EndOfCentralDirectory
/// and CentralDirectory records (if it hasn't been done yet).
/// After that (assuming the file was found). It will parse the apropriate local file block
/// header and data descriptor (if present).
///
internal ZipFileInfo GetFile(string zipFileName)
{
CheckDisposed();
if (_openAccess == FileAccess.Write)
{
throw new InvalidOperationException(SR.Get(SRID.CanNotReadInWriteOnlyMode));
}
// Validate parameteres
zipFileName = ZipIOBlockManager.ValidateNormalizeFileName(zipFileName);
// try to get it from the ZipFileInfo dictionary
if (ZipFileInfoDictionary.Contains(zipFileName))
{
// this ZipFileInfo was already built through AddFile or GetFile(s)
// we have this cached
return (ZipFileInfo)(ZipFileInfoDictionary[zipFileName]);
}
else
{
// we need to check whether it is present in the central directory
if (!FileExists(zipFileName))
{
throw new InvalidOperationException(SR.Get(SRID.FileDoesNotExists));
}
// Load Local File Block through Block Manager
ZipIOLocalFileBlock fileBlock = _blockManager.LoadLocalFileBlock(zipFileName);
// build new ZipFileInfo and add reference to the collection, so we can keep track of the instances of the ZipFileInfo,
// that were given out and invalidate any collection that was returned on GetFiles calls
ZipFileInfo zipFileInfo = new ZipFileInfo(this, fileBlock);
//this should invalidate any outstanding collections
ZipFileInfoDictionary.Add(zipFileInfo.Name, zipFileInfo);
return zipFileInfo;
}
}
///
/// This method will result in a complete parsing of the EndOfCentralDirectory
/// and CentralDirectory records (if it hasn't been done yet).
/// After that it will check whether central directory contains the file.
/// It will not attempt the parsing of the local file headers / descriptors.
///
internal bool FileExists (string zipFileName)
{
CheckDisposed();
// Validate parameteres
zipFileName = ZipIOBlockManager.ValidateNormalizeFileName(zipFileName);
return _blockManager.CentralDirectoryBlock.FileExists(zipFileName);
}
///
/// This method will result in a complete parsing of the EndOfCentralDirectory
/// and CentralDirectory records (if it hasn't been done yet).
/// After that it will check whether central directory contains the file.
/// If it is present it will parse local fileheader, and remove their in memory
/// representation
///
internal void DeleteFile (string zipFileName)
{
CheckDisposed();
if (_openAccess == FileAccess.Read)
{
throw new InvalidOperationException(SR.Get(SRID.CanNotWriteInReadOnlyMode));
}
// Validate parameteres
zipFileName = ZipIOBlockManager.ValidateNormalizeFileName(zipFileName);
if (FileExists(zipFileName)) // is it in central Directory ?
{
ZipFileInfo fileInfoToBeDeleted = GetFile(zipFileName);
//this should invalidate any outstanding collections
// and update central directory status as appropriate
ZipFileInfoDictionary.Remove(zipFileName);
//this should remove the local file block
// from the blockManager's collection
_blockManager.RemoveLocalFileBlock(fileInfoToBeDeleted.LocalFileBlock);
}
}
///
/// This method will result in a complete parsing of the EndOfCentralDirectory
/// and CentralDirectory records (if it hasn't been done yet).
/// After that it will go through allfiles in the central directory and parse their
/// local headers and desciptors one by one.
///
internal ZipFileInfoCollection GetFiles()
{
CheckDisposed();
if (_openAccess == FileAccess.Write)
{
throw new InvalidOperationException(SR.Get(SRID.CanNotReadInWriteOnlyMode));
}
// We need to scan through the central Directory, and for each file
// call GetFile(fileName), which will result in adding missing (not loaded)
// information to the ZipFileInfoDictionary.
foreach(string fileName in _blockManager.CentralDirectoryBlock.GetFileNamesCollection())
{
GetFile(fileName); // fileName must be validated and normalized at this
// point by the central directory parsing routine
}
return new ZipFileInfoCollection(ZipFileInfoDictionary.Values);
}
///
/// This method will result in a complete Flushing of any outstanding data in buffers and
/// any streams ever returned by the GetStream calls.This call results in Archive file that
/// has a completely valid state. If application were to crash right afte the Flush is complete,
/// the resulting files would be a "valid" Zip archive
///
internal void Flush()
{
CheckDisposed();
_blockManager.Save(false);
}
///
/// Results in a complete Flush of all the outstanding buffers and closing/disposing all of the objects
/// ZipFileInfo, Streams ZipArchive.
///
internal void Close()
{
Dispose();
}
///
/// Results in a complete Flush of all the outstanding buffers and closing/disposing all of the objects
/// ZipFileInfo, Streams ZipArchive.
///
public void Dispose()
{
Dispose(true);
// GC.SuppressFinalize(this); // Because this class is sealed and there is no Finalizer,
// there is no need for this call. Leaving it in case we decide to unseal it
}
///
/// Throw if version needed to extract is not supported
///
/// version to inspect
static internal void VerifyVersionNeededToExtract(UInt16 version)
{
// strictly enforce this list
switch (version)
{
case (UInt16)ZipIOVersionNeededToExtract.StoredData: break;
case (UInt16)ZipIOVersionNeededToExtract.VolumeLabel: break;
case (UInt16)ZipIOVersionNeededToExtract.DeflatedData: break;
case (UInt16)ZipIOVersionNeededToExtract.Zip64FileFormat: break;
default:
throw new NotSupportedException(SR.Get(SRID.NotSupportedVersionNeededToExtract));
}
}
//-----------------------------------------------------
//
// Internal Properties
//
//-----------------------------------------------------
///
/// Read only property, that returns the value of FileAccess that
/// was passed into the OpenOnFile or OpenOnStream call
///
internal FileAccess OpenAccess
{
get
{
CheckDisposed();
return _openAccess;
}
}
// This functionality commented out in order to comply with FX Cop rule
// AvoidUncalledPrivateCode. However, because of a chance that this functionality
// might eventually get public exposure we would like to keep this code around
#if ZIP_IO_PUBLIC
///
/// Returns Comment field from the End Of Central Directory Record.
/// Therefore, call to this property might result in some parsing.
/// If the End Of Central Directory isn't parsed yet, it will be as a
/// result of querying this property.
///
internal string Comment
{
get
{
CheckDisposed();
return _blockManager.EndOfCentralDirectoryBlock.Comment;
}
}
#endif
//-----------------------------------------------------
//
// Internal NON API Methods (these methods are marked as
// Internal, and they are trully internal and not the part of the
// internal ZIP IO API surface
//
//------------------------------------------------------
//-----------------------------------------------------
//
// Private Constructors
//
//------------------------------------------------------
///
/// This private constructor isonly supposed to be called by the
/// OpenOnFile and OpenOnStream static members.
///
///
///
///
///
/// true if this class is responsible for closing the archiveStream
private ZipArchive(Stream archiveStream, FileMode mode, FileAccess access, bool streaming, bool ownStream)
{
// as this contructor is only called from the static member
// all checks should have been done before
_blockManager = new ZipIOBlockManager(archiveStream, streaming, ownStream);
_openMode = mode;
_openAccess = access;
// In case of "create" we also need to create at least an end of Central Directory Record.
// For FileMode OpenOrCreate we use stream Length to distinguish open and create scenarios.
// Implications of this decision is that existing file of size 0 opened in OpenOrCreate Mode
// will be treated as a newly/created file.
if ((_openMode == FileMode.CreateNew) ||
(_openMode == FileMode.Create) ||
((_openMode == FileMode.OpenOrCreate) && archiveStream.Length == 0))
{
_blockManager.CreateEndOfCentralDirectoryBlock();
}
else
{
_blockManager.LoadEndOfCentralDirectoryBlock();
}
}
//------------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
///
/// Dispose(bool)
///
///
private void Dispose(bool disposing)
{
if (disposing)
{
if (!_disposedFlag)
{
try
{
// allow this in Debug mode to catch any place where we accidentally
// make something dirty when we are read-only
#if !DEBUG
if (_openAccess == FileAccess.ReadWrite || _openAccess == FileAccess.Write)
#endif
{
_blockManager.Save(true);
}
((IDisposable)_blockManager).Dispose();
}
finally
{
_disposedFlag = true;
}
}
}
}
///
/// This is function is called by the OpenOnFile and OpenOnStream in order
/// to validate parameteresgiven to those functions. The combinations of valid
/// parameters is quite complex and not obvious, so after basic range checks,
/// it is actually using a lookup table to answer the question whether the given
/// parameter combination is valid or not.
///
static private void ValidateModeAccessShareStreaming(Stream stream, FileMode mode, FileAccess access, FileShare share, bool streaming)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
////////////
// filter out values that are out of enum ranges first
////////////
ValidateModeAccessShareValidEnums(mode, access, share);
////////////
// filter out values that are not supported regardless of other parameters
// but still validate enum members
////////////
ValidateModeAccessShareSupportedEnums(mode, share);
////////////
// let's makes sure that given stream is capable of supporting required functionality
////////////
ValidateModeAccessStreamStreamingCombinations(stream, access, streaming);
////////////
//let's make sure that comnbintaion of mode, access,share,,streaming
// parameters is supported
////////////
int intMode = Convert.ToInt32(mode, CultureInfo.InvariantCulture);
int intAccess = Convert.ToInt32(access, CultureInfo.InvariantCulture);
int intShare = Convert.ToInt32(share, CultureInfo.InvariantCulture);
int intStreaming = Convert.ToInt32(streaming, CultureInfo.InvariantCulture);
for(int i=0; i<_validOpenParameters.GetLength(0); i++)
{
if ((_validOpenParameters [i,0] == intMode) &&
(_validOpenParameters [i,1] == intAccess) &&
(_validOpenParameters [i,2] == intShare) &&
(_validOpenParameters [i,3] == intStreaming))
{
return;
}
}
throw new ArgumentException(SR.Get(SRID.UnsupportedCombinationOfModeAccessShareStreaming));
}
static private void ValidateModeAccessStreamStreamingCombinations(Stream stream, FileAccess access, bool streaming)
{
////////////
// let's makes sure that given stream is capable of supporting required functionality
////////////
if ((access== FileAccess.Read || access == FileAccess.ReadWrite) && !stream.CanRead)
{
throw new ArgumentException(SR.Get(SRID.CanNotReadDataFromStreamWhichDoesNotSupportReading));
}
// if user want to be able to write stream needs to support it
if ((access == FileAccess.Write || access == FileAccess.ReadWrite) && !stream.CanWrite)
{
throw new ArgumentException(SR.Get(SRID.CanNotWriteDataToStreamWhichDoesNotSupportWriting));
}
// if user works in non-streaming mode we need to Seek on underlying stream
if (! streaming && !stream.CanSeek)
{
throw new ArgumentException(SR.Get(SRID.CanNotOperateOnStreamWhichDoesNotSupportSeeking));
}
}
static private void ValidateModeAccessShareSupportedEnums(FileMode mode, FileShare share)
{
////////////
// filter out values that are not supported regardless of other parameters
// but still validate enum members
////////////
if (mode == FileMode.Append || mode == FileMode.Truncate)
{
throw new NotSupportedException(SR.Get(SRID.TruncateAppendModesNotSupported));
}
else if (share != FileShare.Read && share != FileShare.None)
{
// later as we get to streaming other FileShare values will be supported too
throw new NotSupportedException (SR.Get(SRID.OnlyFileShareReadAndFileShareNoneSupported));
}
}
static private void ValidateModeAccessShareValidEnums(FileMode mode, FileAccess access, FileShare share)
{
////////////
// filter out values that are out of enum ranges first
////////////
if ((mode != FileMode.Append) && (mode != FileMode.Create) && (mode != FileMode.CreateNew) && (mode != FileMode.Open)
&& (mode != FileMode.OpenOrCreate) && (mode != FileMode.Truncate))
{
throw new ArgumentOutOfRangeException("mode");
}
else if ((access != FileAccess.Read) && (access != FileAccess.ReadWrite) && (access != FileAccess.Write))
{
throw new ArgumentOutOfRangeException("access");
}
else if ((share != FileShare.Delete) && (share != FileShare.Inheritable) && (share != FileShare.None) &&
(share != FileShare.Read) && (share != FileShare.ReadWrite) && (share != FileShare.Write))
{
throw new ArgumentOutOfRangeException("share");
}
}
///
/// Throws exception if object already Disposed/Closed.
///
private void CheckDisposed()
{
if (_disposedFlag)
{
throw new ObjectDisposedException(null, SR.Get(SRID.ZipArchiveDisposed));
}
}
//------------------------------------------------------
//
// Private Properties
//
//-----------------------------------------------------
///
/// This private property is used as a mean to achieve lazy memory allocation for the
/// hashtable that maintains a cahce of the returned instrances of ZipFileInfo(s).
/// This hashtable uses file names as keys in the case insensitive and culture invariant fashion
///
private IDictionary ZipFileInfoDictionary
{
get
{
if (_zipFileInfoDictionary == null)
{
// ordinal case sensitive comparison
_zipFileInfoDictionary = new Hashtable(_zipFileInfoDictionaryInitialSize, StringComparer.Ordinal);
}
return _zipFileInfoDictionary;
}
}
//-----------------------------------------------------
//
// Private Fields
//
//-----------------------------------------------------
// This 2 dimensional table is used by the ValidateModeAccessShareStreaming
// function as a set of valid parameter combinations
static private int[,] _validOpenParameters = new int[,]
{ // FileMode // FileAccess / FileShare // streaming
{(int)FileMode.Create, (int)FileAccess.Write, (int)FileShare.None, 1},
{(int)FileMode.Create, (int)FileAccess.Write, (int)FileShare.Read, 1},
{(int)FileMode.Create, (int)FileAccess.ReadWrite, (int)FileShare.None, 0},
{(int)FileMode.CreateNew, (int)FileAccess.Write, (int)FileShare.None, 1},
{(int)FileMode.CreateNew, (int)FileAccess.Write, (int)FileShare.Read, 1},
{(int)FileMode.CreateNew, (int)FileAccess.ReadWrite, (int)FileShare.None, 0},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.None, 1},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.None, 0},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.Read, 1},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.Read, 0},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.Write, 1},
{(int)FileMode.Open, (int)FileAccess.Read, (int)FileShare.ReadWrite, 1},
{(int)FileMode.Open, (int)FileAccess.ReadWrite, (int)FileShare.None, 0},
{(int)FileMode.OpenOrCreate, (int)FileAccess.ReadWrite, (int)FileShare.None, 0}
};
// modes that were used for openning (OpenOnStream or OpenOnFile),
// there is no way to change these values after class is constructed
private FileMode _openMode;
private FileAccess _openAccess;
private bool _disposedFlag;
// reference to the ZipIOBlockManager, this reference is instantiated as
// a part of the OpenOnFile/OpenOnStream contruction
private ZipIOBlockManager _blockManager;
// this is a Dictionary of all the ZipFileInfos that were given out.
// It uses file name as key in case insensitive and culture invariant fashion.
// all members of the class are supposed to use this field indirectly through
// ZipFileInfoDictionary property, as ZipFileInfoDictionary is respnsible
// for lazy allocation of the hashtable.
private IDictionary _zipFileInfoDictionary;
private const int _zipFileInfoDictionaryInitialSize = 50;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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