| public readFully ( byte b, int off, int len ) : void | ||
| b | byte | The buffer into which the data is to be read. It must be long /// enough. /// /// |
| off | int | The index in 'b' where to place the first byte read. /// /// |
| len | int | The number of bytes to read. /// /// |
| return | void | |
public void readFully(byte[] b, int off, int len)
{
int clen; // current length to read
while (len > 0)
{
// There still is some data to read
if (position < maxByte)
{
// We can read some data from buffer
clen = maxByte - position;
if (clen > len)
clen = len;
Array.Copy(byteBuffer, position, b, off, clen);
position += clen;
off += clen;
len -= clen;
}
else if (isEOFInBuffer)
{
position = maxByte + 1; // Set position to EOF
throw new System.IO.EndOfStreamException();
}
else
{
// Buffer empty => get more data
readNewBuffer(offset + position);
}
}
}
/// <summary> This method reads and buffers the tile headers, packet headers and
/// packet data.
///
/// </summary>
/// <param name="fi">The file to read the headers and data from
///
/// </param>
/// <exception cref="IOException">If an I/O error ocurred.
///
/// </exception>
private void readAndBuffer(BufferedRandomAccessFile fi)
{
int p, prem, length, t, markIndex;
// Buffer main header
fi.seek(0);
length = ((System.Int32) positions[0]) - 2;
mainHeader = new byte[length];
fi.readFully(mainHeader, 0, length);
markIndex = 0;
for (t = 0; t < nt; t++)
{
prem = ppt[t];
packetHeaders[t] = new byte[prem][];
packetData[t] = new byte[prem][];
sopMarkSeg[t] = new byte[prem][];
// Read tile header
length = positions[markIndex + 1] - positions[markIndex];
tileHeaders[t] = new byte[length];
fi.readFully(tileHeaders[t], 0, length);
markIndex++;
for (p = 0; p < prem; p++)
{
// Read packet header
length = positions[markIndex + 1] - positions[markIndex];
if (tempSop)
{
// SOP marker is skipped
length -= CSJ2K.j2k.codestream.Markers.SOP_LENGTH;
fi.skipBytes(CSJ2K.j2k.codestream.Markers.SOP_LENGTH);
}
else
{
// SOP marker is read and buffered
length -= CSJ2K.j2k.codestream.Markers.SOP_LENGTH;
sopMarkSeg[t][p] = new byte[CSJ2K.j2k.codestream.Markers.SOP_LENGTH];
fi.readFully(sopMarkSeg[t][p], 0, CSJ2K.j2k.codestream.Markers.SOP_LENGTH);
}
if (!tempEph)
{
// EPH marker is kept in header
length += CSJ2K.j2k.codestream.Markers.EPH_LENGTH;
}
packetHeaders[t][p] = new byte[length];
fi.readFully(packetHeaders[t][p], 0, length);
markIndex++;
// Read packet data
length = positions[markIndex + 1] - positions[markIndex];
length -= CSJ2K.j2k.codestream.Markers.EPH_LENGTH;
if (tempEph)
{
// EPH marker is used and is skipped
fi.skipBytes(CSJ2K.j2k.codestream.Markers.EPH_LENGTH);
}
packetData[t][p] = new byte[length];
fi.readFully(packetData[t][p], 0, length);
markIndex++;
}
}
}
