static byte[] doGZconvert(ref typZipHead objZiphead, ref byte[] bytBuffer)
{
MemoryStream objMemory = new MemoryStream();
objMemory.Write(new byte[] { 0x1f, 0x8b, 8, 8 }, 0, 4);
objMemory.Write(new byte[] { 0, 0, 0, 0 }, 0, 4);
objMemory.Write(new byte[] { 2, 0 }, 0, 2);
objMemory.Write(bytBuffer, 0, objZiphead.zipFileNameLength);
objMemory.WriteByte(0);
objMemory.Write(bytBuffer, objZiphead.zipFileNameLength, (int)objZiphead.zipCompressedSize);
objMemory.Write(BitConverter.GetBytes(objZiphead.zipCRC), 0, 4);
objMemory.Write(BitConverter.GetBytes(objZiphead.zipUncompressedSize), 0, 4);
bytBuffer = doGZextract(ref objMemory);
return(bytBuffer);
}
static byte[] unZip(string filZipname)
{
BinaryReader reader = new BinaryReader(File.Open(filZipname, FileMode.Open, FileAccess.Read));
typZipHead objZiphead = new typZipHead();
reader.BaseStream.Seek(0x1aL, SeekOrigin.Begin);
objZiphead.zipFileNameLength = reader.ReadInt16();
reader.BaseStream.Seek((long)(-80 - objZiphead.zipFileNameLength), SeekOrigin.End);
objZiphead.zipCRC = reader.ReadInt32();
objZiphead.zipCompressedSize = reader.ReadInt32();
objZiphead.zipUncompressedSize = reader.ReadInt32();
reader.BaseStream.Seek(30L, SeekOrigin.Begin);
byte[] bytBuffer = new byte[(objZiphead.zipFileNameLength + ((int)objZiphead.zipCompressedSize)) + 1];
int num2 = bytBuffer.Length - 1;
for (int i = 0; i <= num2; i++)
{
bytBuffer[i] = reader.ReadByte();
}
bytBuffer = doGZconvert(ref objZiphead, ref bytBuffer);
reader.Close();
return(bytBuffer);
}
