/// <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);
}
}
/// <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);
}
}
