com.sun.pdfview.decode
Class PDFDecoder

java.lang.Object
  extended by com.sun.pdfview.decode.PDFDecoder

public class PDFDecoder
extends java.lang.Object

A PDF Decoder encapsulates all the methods of decoding a stream of bytes based on all the various encoding methods.

You should use the decodeStream() method of this object rather than using any of the decoders directly.


Field Summary
static java.util.Set<java.lang.String> DCT_FILTERS
           
 
Method Summary
static java.nio.ByteBuffer decodeStream(PDFObject dict, java.nio.ByteBuffer streamBuf, java.util.Set<java.lang.String> filterLimits)
          decode a byte[] stream using the filters specified in the object's dictionary (passed as argument 1).
static boolean isEncrypted(PDFObject dict)
          Determines whether a stream is encrypted or not; note that encodings (e.g., Flate, LZW) are not considered encryptions.
static boolean isLastFilter(PDFObject dict, java.util.Set<java.lang.String> filters)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DCT_FILTERS

public static final java.util.Set<java.lang.String> DCT_FILTERS
Method Detail

isLastFilter

public static boolean isLastFilter(PDFObject dict,
                                   java.util.Set<java.lang.String> filters)
                            throws java.io.IOException
Throws:
java.io.IOException

decodeStream

public static java.nio.ByteBuffer decodeStream(PDFObject dict,
                                               java.nio.ByteBuffer streamBuf,
                                               java.util.Set<java.lang.String> filterLimits)
                                        throws java.io.IOException
decode a byte[] stream using the filters specified in the object's dictionary (passed as argument 1).

Parameters:
dict - the dictionary associated with the stream
streamBuf - the data in the stream, as a byte buffer
Throws:
java.io.IOException

isEncrypted

public static boolean isEncrypted(PDFObject dict)
                           throws java.io.IOException
Determines whether a stream is encrypted or not; note that encodings (e.g., Flate, LZW) are not considered encryptions.

Parameters:
dict - the stream dictionary
Returns:
whether the stream is encrypted
Throws:
java.io.IOException - if the stream dictionary can't be read