/// <summary>
/// Open an new ZipStream. Each ZipStream gets its own zzipDir to allow correct multithreaded reading of files.
/// These handles come out of a pool managed by zipFile so tons of extras are not created.
/// </summary>
/// <remarks>
/// This is based on:
/// https://bitbucket.org/sinbad/ogre/pull-request/63/made-each-zip-file-stream-have-its-own-zip/diff
/// http://zziplib.sourceforge.net/changes.html under 2005-12-11, the zip file is opened and read with only one filehandle for
/// multiple threads that share the same "dir" handle. Look for ->currentfp. To get around this we will just open a new zzipDir
/// for each file. This uses the extern functions in ZipFile to do this, they are internal.
/// </remarks>
/// <param name="zipFile">The name of the zip file to load.</param>
/// <param name="fileName">The name of the file to load.</param>
internal unsafe ZipStream(PooledZzipDir zzipDir, String fileName)
{
this.zzipDir = zzipDir;
//Get uncompressed size
ZZipStat zstat = new ZZipStat();
ZipFile.ZipFile_DirStat(zzipDir.Ptr, fileName, &zstat, (int)ZZipFlags.ZZIP_CASELESS);
uncompressedSize = zstat.UncompressedSize;
//Open file
zzipFile = ZipFile.ZipFile_OpenFile(zzipDir.Ptr, fileName, ZZipFlags.ZZIP_ONLYZIP | ZZipFlags.ZZIP_CASELESS);
if (zzipFile == IntPtr.Zero)
{
//Be sure to return the directory handle
zzipDir.finished();
throw new ZipIOException("Cannot open file");
}
}
private unsafe void commonLoad()
{
pooledZzipDirHandles = new LifecycleObjectPool <PooledZzipDir>(() => new PooledZzipDir(file), dir => dir.Dispose());
pooledZzipDirHandles.MaxPoolSize = 3;
PooledZzipDir zzipDir = pooledZzipDirHandles.getPooledObject();
HashSet <String> foundDirectories = new HashSet <string>();
//Read the directories and files out of the zip file
ZZipStat zzipEntry = new ZZipStat();
while (ZipFile_Read(zzipDir.Ptr, &zzipEntry))
{
String entryName = zzipEntry.Name;
if (fileFilter == null || entryName.StartsWith(fileFilter))
{
ZipFileInfo fileInfo = new ZipFileInfo(entryName, zzipEntry.CompressedSize, zzipEntry.UncompressedSize);
//Make sure we don't end with a /
if (fileInfo.IsDirectory)
{
if (!foundDirectories.Contains(fileInfo.FullName))
{
directories.Add(fileInfo);
foundDirectories.Add(fileInfo.FullName);
}
}
else
{
files.Add(fileInfo);
}
addParentDirectories(foundDirectories, fileInfo);
}
}
zzipDir.finished();
}