public ZipArchive()
{
CentralDirectoryFooter = new CentralDirectoryFooter {
ZipArchive = this
};
Entries = new ZipEntryCollection(this);
}
internal override int GetSize()
{
return(CentralDirectoryFooter.GetSize() +
Entries.Sum(entry =>
entry.CentralDirectoryHeader.GetSize()
+ entry.LocalFileHeader.GetSize()
+ (entry.Data?.Length ?? 0)
+ (entry.HasDataDescriptor ? entry.DataDescriptor.GetSize() : 0)));
}
public void Write(BinaryWriter writer)
{
Offset = writer.BaseStream.Position;
foreach (var entry in Entries)
{
entry.Write(writer);
}
foreach (var entry in Entries)
{
entry.CentralDirectoryHeader.Write(writer);
}
CentralDirectoryFooter.Write(writer);
if (writer.BaseStream.Position - Offset != GetSize())
{
throw new NotSupportedException("size mismatch");
}
}
public static ZipArchive Read(BinaryReader reader)
{
var zip = new ZipArchive {
Offset = reader.BaseStream.Position, CentralDirectoryFooter = CentralDirectoryFooter.Read(reader)
};
zip.CentralDirectoryFooter.ZipArchive = zip;
var headers = new List <CentralDirectoryHeader>();
reader.BaseStream.Seek(zip.CentralDirectoryFooter.CentralDirectoryOffset, SeekOrigin.Begin);
for (var i = 0; i < zip.CentralDirectoryFooter.DiskEntries; i++)
{
headers.Add(CentralDirectoryHeader.Read(reader));
}
foreach (var header in headers)
{
zip.Entries.Add(ZipEntry.Read(reader, header));
}
return(zip);
}