com.sun.pdfview.decode

Class PDFDecoder

java.lang.Object

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

Fields

Modifier and Type	Field and Description
static java.util.Set<java.lang.String>	DCT_FILTERS

Method Summary

Modifier and Type	Method and Description
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