/// <summary>
/// UnZip files from zip archive in a stream.
/// </summary>
/// <param name="zipStream">Zip archive stream.</param>
/// <returns>Each file in the archive.</returns>
public static IEnumerable <UncompressedFile> UnZip(Stream zipStream)
{
BinaryReader binaryReader = new BinaryReader(zipStream);
LimitedStream limitedStream = new LimitedStream(zipStream, 0);
while (true)
{
uint signature = binaryReader.ReadUInt32();
if (signature == 0x02014b50)
{
break;
}
if (signature != 0x04034b50)
{
throw new ApplicationException("Zip file is broken or corrupt");
}
binaryReader.ReadBytes(2);
ushort flags = binaryReader.ReadUInt16();
if ((flags & (1 << 3)) != 0)
{
throw new ApplicationException("Unsupported Zip file format (compressed size not available in header");
}
ushort method = binaryReader.ReadUInt16();
binaryReader.ReadBytes(8);
uint compressedSize = binaryReader.ReadUInt32();
binaryReader.ReadBytes(4);
ushort fileNameLength = binaryReader.ReadUInt16();
ushort extraFieldLength = binaryReader.ReadUInt16();
string filename = Encoding.ASCII.GetString(binaryReader.ReadBytes(fileNameLength)).Replace('/', Path.DirectorySeparatorChar);
binaryReader.ReadBytes(extraFieldLength);
limitedStream.Limit = compressedSize;
switch (method)
{
case 0:
// No compression
yield return(new UncompressedFile(filename, limitedStream));
break;
case 8:
// Deflate
DeflateStream deflateStream = new DeflateStream(limitedStream, CompressionMode.Decompress, true);
yield return(new UncompressedFile(filename, deflateStream));
break;
default:
// Ignore...
break;
}
limitedStream.SeekToEnd();
}
limitedStream.Close();
binaryReader.Close();
}
