public ZipEndOfCentralDirectory(Stream stream)
{
BinaryReader reader = new BinaryReader(stream);
// Start searching for the Zip End of Central Directory signature from the end
// of the file backwards (towards the beginning of the file). This allows us to
// find Zip archives with extra data appended to the archive (for whatever reason
// someone might want to do that).
long offset = stream.Length - ZipEndOfCentralDirectory.EOCD_RECORD_FIXEDSIZE;
for (; offset >= 0; --offset)
{
stream.Seek(offset, SeekOrigin.Begin);
uint sig = reader.ReadUInt32();
if (sig == ZipEndOfCentralDirectory.EOCDSIG)
{
break;
}
}
if (offset < 0)
{
throw new InvalidDataException("Failed to find end of central directory record.");
}
stream.Seek(offset, SeekOrigin.Begin);
this.Read(stream);
// If the offset to the central directory is DWORD_MAX then this must be a 64-bit
// archive.
if (this.dirOffset == (long)UInt32.MaxValue)
{
string saveComment = this.comment;
stream.Seek(offset - Zip64EndOfCentralDirectoryLocator.EOCDL64_SIZE, SeekOrigin.Begin);
Zip64EndOfCentralDirectoryLocator eocdl = new Zip64EndOfCentralDirectoryLocator(stream);
if (eocdl.dirStartDiskNumber == eocdl.totalDisks - 1)
{
// ZIP64 eocd is entirely in current stream.
stream.Seek(eocdl.dirOffset, SeekOrigin.Begin);
this.Read64(stream);
}
else
{
// TODO: handle EOCD64 spanning archives!
throw new NotImplementedException("Zip implementation does not handle end of central directory record that spans archives.");
}
this.comment = saveComment;
}
// Read the central directory for the archive.
stream.Seek(this.dirOffset, SeekOrigin.Begin);
while (this.headers.Count < this.totalEntries)
{
ZipFileHeader header = new ZipFileHeader(true);
if (!header.Read(stream))
{
throw new InvalidDataException("Missing or invalid central directory file header");
}
this.headers.Add(header);
if (this.headers.Count < this.totalEntries && stream.Position == stream.Length)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//this.currentArchiveNumber++;
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//if (archiveStream == null)
//{
// this.currentArchiveNumber = 0;
// archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//}
}
}
}
public IList <ZipFileHeader> GetCentralDirectory(Stream streamContext)
{
Stream archiveStream = null;
//this.currentArchiveNumber = 0;
try
{
List <ZipFileHeader> headers = new List <ZipFileHeader>();
archiveStream = streamContext;
//archiveStream = this.OpenArchive(streamContext, 0);
ZipEndOfCentralDirectory eocd = this.GetEOCD(archiveStream);
if (eocd == null)
{
return(null);
}
else if (eocd.totalEntries == 0)
{
return(headers);
}
headers.Capacity = (int)eocd.totalEntries;
if (eocd.dirOffset > archiveStream.Length - ZipFileHeader.CFH_FIXEDSIZE)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
archiveStream = null;
}
else
{
archiveStream.Seek(eocd.dirOffset, SeekOrigin.Begin);
uint sig = new BinaryReader(archiveStream).ReadUInt32();
if (sig != ZipFileHeader.CFHSIG)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
archiveStream = null;
}
}
if (archiveStream == null)
{
//this.currentArchiveNumber = (short)(eocd.dirStartDiskNumber + 1);
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
if (archiveStream == null)
{
return(null);
}
}
archiveStream.Seek(eocd.dirOffset, SeekOrigin.Begin);
while (headers.Count < eocd.totalEntries)
{
ZipFileHeader header = new ZipFileHeader(true);
if (!header.Read(archiveStream))
{
throw new InvalidDataException("Missing or invalid central directory file header");
}
headers.Add(header);
if (headers.Count < eocd.totalEntries && archiveStream.Position == archiveStream.Length)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//this.currentArchiveNumber++;
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//if (archiveStream == null)
//{
// this.currentArchiveNumber = 0;
// archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//}
}
}
return(headers);
}
finally
{
//if (archiveStream != null)
//{
// streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//}
}
}