photo credit: massdistraction
I’m writing this post since I’ve found a lot of people having similar problems, so hopefully it will be useful to someone.
I’ve had Linux/Mac people reporting that the ZIP package of GroundTruth which I released yesterday could not be extracted. The package was created programmatically using the SharpZibLib, an open source .NET ZIP library. I myself did not detect any problems, it works OK on my Vista machines.
I’ve done some investigation (Google, inspecting other open source projects…) and found a small hint what could be the culprit – I wasn’t setting the ZipEntry.Size property when I was adding files to the package. So here I’m posting a code snippet on how to create a ZIP package with selectively added files:
using (FileStream zipFileStream = new FileStream(
zipFileName,
FileMode.Create,
FileAccess.ReadWrite,
FileShare.None))
{
using (ZipOutputStream zipStream = new ZipOutputStream(zipFileStream))
{
byte[] buffer = new byte[1024 * 1024];
foreach (string fileName in filesToZip)
{
string cleanedFileName = ZipEntry.CleanName(fileName);
using (FileStream fileStream = File.OpenRead (fileName))
{
ZipEntry entry = new ZipEntry (cleanedFileName);
entry.DateTime = File.GetLastWriteTime(fileName);
entry.Size = fileStream.Length;
zipStream.PutNextEntry (entry);
int sourceBytes;
while (true)
{
sourceBytes = fileStream.Read(buffer, 0, buffer.Length);
if (sourceBytes == 0)
break;
zipStream.Write(buffer, 0, sourceBytes);
}
}
}
}
}
