/// <summary>
/// copy as much as possible from the sliding Window to the output area
/// </summary>
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 = ReadPos;
// compute number of bytes to copy as far as End of Window
n = (int)((q <= WritePos?WritePos:End) - q);
if (n > z.avail_out)
{
n = z.avail_out;
}
if (n != 0 && r == (int)ZLibResultCode.Z_BUF_ERROR)
{
r = (int)ZLibResultCode.Z_OK;
}
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (this.needCheck)
{
z.adler = check = Adler32.GetAdler32Checksum(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 (WritePos == End)
{
WritePos = 0;
}
// compute bytes to copy
n = WritePos - q;
if (n > z.avail_out)
{
n = z.avail_out;
}
if (n != 0 && r == (int)ZLibResultCode.Z_BUF_ERROR)
{
r = (int)ZLibResultCode.Z_OK;
}
// update counters
z.avail_out -= n;
z.total_out += n;
// update check information
if (this.needCheck)
{
z.adler = check = Adler32.GetAdler32Checksum(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;
ReadPos = q;
// done
return(r);
}