public static bool IsZipFile(string fileName)
{
Requires.NotEmpty(fileName);
using (var fileStream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.None))
{
// Load End Of Central Directory Record
var zipEoCDR = new TZipEndOfCentralDirectoryRecord();
zipEoCDR.Load(fileStream);
if (zipEoCDR.Position > 0)
{
return(true);
}
}
return(false);
}
public static bool IsZipFile(string fileName)
{
if (string.IsNullOrWhiteSpace(fileName))
{
throw new ArgumentNullException(nameof(fileName));
}
using (var fileStream = File.Open(fileName, FileMode.Open, FileAccess.Read, FileShare.None))
{
// Load End Of Central Directory Record
var zipEoCDR = new TZipEndOfCentralDirectoryRecord();
zipEoCDR.Load(fileStream);
if (zipEoCDR.Position > 0)
{
return(true);
}
}
return(false);
}
/// <summary>
/// Reads Zip file central directory for later access.
/// </summary>
/// <param name="containerPath">Path to main zip container (e.g. MyZip.zip).</param>
/// <returns></returns>
public bool Init(string containerPath)
{
if (string.IsNullOrWhiteSpace(containerPath))
{
throw new ArgumentNullException(nameof(containerPath));
}
Report.BeginTimed("Init Zip container '" + containerPath + "'.");
FileStream mainFileStream = null;
FileStream[] zipStreams = new FileStream[0];
try
{
mainFileStream = File.Open(containerPath, FileMode.Open, FileAccess.Read, FileShare.None);
// Load End Of Central Directory Record
var zipEoCDR = new TZipEndOfCentralDirectoryRecord();
zipEoCDR.Load(mainFileStream);
if (zipEoCDR.Position < 0)
{
throw new Exception("ZipFile: couldn't find central directory record.");
}
int numberOfEntries = zipEoCDR.cd_totalEntries;
long cd_offset = zipEoCDR.cd_offset;
int cd_diskId = zipEoCDR.cd_diskId;
// init number of zip containers
m_ZipFileNames = new string[zipEoCDR.cd_diskId + 1];
m_ZipFileNames[zipEoCDR.cd_diskId] = containerPath;
zipStreams = new FileStream[zipEoCDR.cd_diskId + 1];
zipStreams[zipEoCDR.cd_diskId] = mainFileStream;
// Load all parts of a multi zip
if (zipEoCDR.cd_diskId > 0)
{
Report.Line("Is multi zip container.");
// Segment 1 = filename.z01
// Segment n-1 = filename.z(n-1)
// Segment n = filename.zip
var baseName =
0 == containerPath.Substring(containerPath.Length - 4).ToLower().CompareTo(".zip") ?
containerPath.Substring(0, containerPath.Length - 4) :
containerPath;
baseName += ".z";
for (int i = 0; i < zipEoCDR.cd_diskId; i++)
{
m_ZipFileNames[i] = baseName + (i + 1).ToString("D2");
zipStreams[i] = File.Open(m_ZipFileNames[i], FileMode.Open, FileAccess.Read, FileShare.None);
}
}
// Try to load Zip64 End Of Central Directory Locator
var zip64Locator = new TZip64EndOfCentralDirectoryLocator();
zip64Locator.Load(mainFileStream, zipEoCDR.Position);
if (zip64Locator.IsValid)
{
Report.Line("Is Zip64 container.");
// Load Zip64 End of Central Directory Record
var zip64EoCDR = new TZip64EndOfCentralDirectoryRecord();
zip64EoCDR.Load(
zipStreams[zip64Locator.ecd64_diskId],
(long)zip64Locator.ecd64_relOffset
);
numberOfEntries = (int)zip64EoCDR.cd_totalEntries;
cd_offset = (long)zip64EoCDR.cd_offset;
cd_diskId = (int)zip64EoCDR.cd_diskId;
}
// Load file headers in central directory
this.ReadZipCentralDirectoryFileHeaders(zipStreams, cd_diskId, cd_offset, numberOfEntries);
// save weak links to streams
m_ZipFileStreams = new WeakReference[zipStreams.Length];
for (int i = 0; i < zipStreams.Length; i++)
{
m_ZipFileStreams[i] = new WeakReference(zipStreams[i]);
}
}
catch (Exception)
{
Report.Warn("Error initializing container.");
Report.End();
foreach (var stream in zipStreams)
{
if (stream != null)
{
stream.Close();
}
}
if (mainFileStream != null)
{
mainFileStream.Close();
}
return(false);
}
Report.End("Init Zip container finished.");
return(true);
}
