/// <summary>
/// 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
/// </summary>
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);
}
}
internal static ZipIOCentralDirectoryFileHeader ParseRecord(BinaryReader reader, Encoding encoding)
{
ZipIOCentralDirectoryFileHeader header = new ZipIOCentralDirectoryFileHeader(encoding);
header._signature = reader.ReadUInt32();
header._versionMadeBy = reader.ReadUInt16();
header._versionNeededToExtract = reader.ReadUInt16();
header._generalPurposeBitFlag = reader.ReadUInt16();
header._compressionMethod = reader.ReadUInt16();
header._lastModFileDateTime = reader.ReadUInt32();
header._crc32 = reader.ReadUInt32();
header._compressedSize = reader.ReadUInt32();
header._uncompressedSize = reader.ReadUInt32();
header._fileNameLength = reader.ReadUInt16();
header._extraFieldLength = reader.ReadUInt16();
header._fileCommentLength = reader.ReadUInt16();
header._diskNumberStart = reader.ReadUInt16();
header._internalFileAttributes = reader.ReadUInt16();
header._externalFileAttributes = reader.ReadUInt32();
header._relativeOffsetOfLocalHeader = reader.ReadUInt32();
header._fileName = reader.ReadBytes(header._fileNameLength);
// check for the ZIP 64 version and escaped values
ZipIOZip64ExtraFieldUsage zip64extraFieldUsage = ZipIOZip64ExtraFieldUsage.None;
if (header._versionNeededToExtract >= (ushort)ZipIOVersionNeededToExtract.Zip64FileFormat)
{
if (header._compressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.CompressedSize;
}
if (header._uncompressedSize == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.UncompressedSize;
}
if (header._relativeOffsetOfLocalHeader == UInt32.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.OffsetOfLocalHeader;
}
if (header._diskNumberStart == UInt16.MaxValue)
{
zip64extraFieldUsage |= ZipIOZip64ExtraFieldUsage.DiskNumber;
}
}
// if the ZIP 64 record is missing the zip64extraFieldUsage value will be ignored
header._extraField = ZipIOExtraField.ParseRecord(reader,
zip64extraFieldUsage,
header._extraFieldLength);
header._fileComment = reader.ReadBytes(header._fileCommentLength);
//populate frequently used field with user friendly data representations
header._stringFileName = ZipIOBlockManager.ValidateNormalizeFileName(encoding.GetString(header._fileName));
header.Validate();
return(header);
}
/// <summary>
/// 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.
/// </summary>
internal bool FileExists(string zipFileName)
{
CheckDisposed();
// Validate parameteres
zipFileName = ZipIOBlockManager.ValidateNormalizeFileName(zipFileName);
return(_blockManager.CentralDirectoryBlock.FileExists(zipFileName));
}
/// <summary>
/// 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.
/// </summary>
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);
}
/// <summary>
/// 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).
/// </summary>
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);
}
}
