public long CreateChecksum()
{
Adler32 adler32 = new Adler32();
long a1 = 0, a2 = 0;
byte[] header_value = new byte[Header];
content.Seek(0, SeekOrigin.Begin);
content.Read(header_value, 0, Header);
for (int i = 0; i < Header; i += 6) {
int pos = ByteBuffer.ReadInt4(header_value, i);
int len = ((int)ByteBuffer.ReadInt2(header_value, i + 4)) & 0x0FFFF;
byte[] node = new byte[len];
content.Seek(pos, SeekOrigin.Begin);
content.Read(node, 0, len);
if ((i & 0x01) == 0) {
a1 = adler32.adler32(a1, node, 0, len);
} else {
a2 = adler32.adler32(a2, node, 0, len);
}
}
// Return the 64 bit value checksum,
return (a1 << 32) | a2;
}
public void free()
{
next_in = null;
next_out = null;
msg = null;
_adler = null;
}
// copy as much as possible from the sliding window to the output area
internal int inflate_flush(ZStream z, int r)
{
int n;
int p;
int q;
// local copies of source and destination pointers
p = z.next_out_index;
q = read;
// compute number of bytes to copy as far as end of window
n = (int)((q <= write?write:end) - q);
if (n > z.avail_out)
{
n = z.avail_out;
}
if (n != 0 && r == Z_BUF_ERROR)
{
r = Z_OK;
}
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (checkfn != null)
{
z.adler = check = Adler32.adler32(check, window, q, n);
}
// copy as far as end of window
Array.Copy(window, q, z.next_out, p, n);
p += n;
q += n;
// see if more to copy at beginning of window
if (q == end)
{
// wrap pointers
q = 0;
if (write == end)
{
write = 0;
}
// compute bytes to copy
n = write - q;
if (n > z.avail_out)
{
n = z.avail_out;
}
if (n != 0 && r == Z_BUF_ERROR)
{
r = Z_OK;
}
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (checkfn != null)
{
z.adler = check = Adler32.adler32(check, window, q, n);
}
// copy
Array.Copy(window, q, z.next_out, p, n);
p += n;
q += n;
}
// update pointers
z.next_out_index = p;
read = q;
// done
return(r);
}
