private void HandleSegmentReferredToCountAndRententionFlags(SegmentHeader segmentHeader)
{
short referedToSegmentCountAndRetentionFlags = reader.Readbyte();
int referredToSegmentCount = (referedToSegmentCountAndRetentionFlags & 224) >> 5; // 224
// =
// 11100000
short[] retentionFlags = null;
/** take off the first three bits of the first byte */
short firstbyte = (short)(referedToSegmentCountAndRetentionFlags & 31); // 31 =
// 00011111
if (referredToSegmentCount <= 4)
{ // short form
retentionFlags = new short[1];
retentionFlags[0] = firstbyte;
}
else if (referredToSegmentCount == 7)
{ // long form
short[] longFormCountAndFlags = new short[4];
/** add the first byte of the four */
longFormCountAndFlags[0] = firstbyte;
for (int i = 1; i < 4; i++)
{
// add the next 3 bytes to the array
longFormCountAndFlags[i] = reader.Readbyte();
}
/** get the count of the referred to Segments */
referredToSegmentCount = BinaryOperation.GetInt32(longFormCountAndFlags);
/** calculate the number of bytes in this field */
int noOfbytesInField = (int)Math.Ceiling(4 + ((referredToSegmentCount + 1) / 8d));
// System.out.println("noOfbytesInField = " + noOfbytesInField);
int noOfRententionFlagbytes = noOfbytesInField - 4;
retentionFlags = new short[noOfRententionFlagbytes];
reader.Readbyte(retentionFlags);
}
else
{ // error
//throw new JBIG2Exception("Error, 3 bit Segment count field = " + referredToSegmentCount);
}
segmentHeader.SetReferredToSegmentCount(referredToSegmentCount);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("referredToSegmentCount = " + referredToSegmentCount);
}
segmentHeader.SetRententionFlags(retentionFlags);
if (JBIG2StreamDecoder.debug)
{
Console.WriteLine("retentionFlags = ");
}
if (JBIG2StreamDecoder.debug)
{
for (int i = 0; i < retentionFlags.Length; i++)
{
Console.WriteLine(retentionFlags[i] + " ");
}
Console.WriteLine("");
}
}
