/*
val= 393220
val= 1
val= 3817105751 t=10982
*/
public static void testAdler()
{
Console.WriteLine("Testing Adler32");
Adler32 crc1 = new Adler32();
crc1.Update(new byte[] { 1, 2 });
Console.WriteLine("val= " + crc1.GetValue());
if (crc1.GetValue() != 393220) throw new Exception("Bad Adler32!");
crc1.Reset();
Console.WriteLine("val= " + crc1.GetValue());
if (crc1.GetValue() != 1) throw new Exception("Bad Adler32!!");
Random r = new Random();
byte[] all = new byte[2000 * 4];
long t0 = Environment.TickCount;
for (int n = 0; n < 2000; n++) {
byte[] b = createBytes7(n < 50 ? n : n * n - 7);
Adler32 crc = new Adler32();
int offset = 0;
while (offset < b.Length) {
int len = r.Next(b.Length - offset) + 1;
crc.Update(b, offset, len);
offset += len;
}
long x = crc.GetValue();
all[n * 4] = (byte)((x >> 24) & 0xff);
all[n * 4 + 1] = (byte)((x >> 16) & 0xff);
all[n * 4 + 2] = (byte)((x >> 8) & 0xff);
all[n * 4 + 3] = (byte)((x ) & 0xff);
}
long t1 = Environment.TickCount;
Adler32 a = new Adler32();
a.Update(all);
long v = a.GetValue();
Console.WriteLine("val= " + v + " t=" + (t1 - t0));
if (v != 3817105751) throw new Exception("Bad Adler32");// tested with Java CRC32
}
public virtual void Close()
{
if (!initdone)
{
doInit(); // can happen if never called write
}
if (closed)
{
return;
}
closed = true;
// sigh ... no only must I close the parent stream to force a flush, but I must save a reference
// raw stream because (apparently) Close() sets it to null (shame on you, MS developers)
if (deflateStream != null)
{
deflateStream.Dispose();
}
else // second hack: empty input?
{
rawStream.WriteByte(3);
rawStream.WriteByte(0);
}
// add crc
uint crcv = adler32.GetValue();
rawStream.WriteByte((byte)((crcv >> 24) & 0xFF));
rawStream.WriteByte((byte)((crcv >> 16) & 0xFF));
rawStream.WriteByte((byte)((crcv >> 8) & 0xFF));
rawStream.WriteByte((byte)((crcv) & 0xFF));
if (!leaveOpen)
{
rawStream.Dispose();
}
}
protected override void Dispose(bool disposing)
{
if (!initdone)
{
doInit();
}
if (!closed)
{
closed = true;
if (deflateStream != null)
{
deflateStream.Dispose();
}
else
{
rawStream.WriteByte(3);
rawStream.WriteByte(0);
}
uint value = adler32.GetValue();
rawStream.WriteByte((byte)((value >> 24) & 0xFF));
rawStream.WriteByte((byte)((value >> 16) & 0xFF));
rawStream.WriteByte((byte)((value >> 8) & 0xFF));
rawStream.WriteByte((byte)(value & 0xFF));
if (!leaveOpen)
{
rawStream.Dispose();
}
}
}