Package org.loboevolution.pdfview.decode

Class PDFDecoder

java.lang.Object

org.loboevolution.pdfview.decode.PDFDecoder

public class PDFDecoder
extends 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	Description
static final Set<String>	DCT_FILTERS	Constant DCT_FILTERS

Method Summary

Modifier and Type	Method	Description
static ByteBuffer	decodeStream(PDFObject dict, ByteBuffer streamBuf, Set<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, Set<String> filters)	isLastFilter.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DCT_FILTERS

public static final Set<String> DCT_FILTERS

Constant DCT_FILTERS

Method Details

isLastFilter

public static boolean isLastFilter(PDFObject dict,
 Set<String> filters)
                            throws IOException

isLastFilter.

Parameters:

dict - a PDFObject object.

filters - a Set object.

Returns:

a boolean.

Throws:

IOException - if any.

decodeStream

public static ByteBuffer decodeStream(PDFObject dict,
 ByteBuffer streamBuf,
 Set<String> filterLimits)
                               throws 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

filterLimits - a Set object.

Returns:

a ByteBuffer object.

Throws:

IOException - if any.

isEncrypted

public static boolean isEncrypted(PDFObject dict)
                           throws 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:

IOException - if any.