edu.harvard.hul.ois.jhove.module.pdf

Class PdfFlateInputStream

java.lang.Object

java.io.InputStream

java.io.FilterInputStream

edu.harvard.hul.ois.jhove.module.pdf.PdfFlateInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class PdfFlateInputStream
extends FilterInputStream

An enhancement of InflaterInputStream to support Predictor and Columns. How complicated does this get? Do I need to read the whole thing before I can "predict" anything?

Author:

Gary McGath

Field Summary

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

Constructors

Constructor and Description
PdfFlateInputStream(InputStream is) Constructor with null DecodeParms dictionary
PdfFlateInputStream(InputStream is, PdfDictionary parms) Constructor with specified DecodeParms dictionary

Method Summary

Modifier and Type	Method and Description
int	read() Reads one byte from the stream.
int	read(byte[] b) Reads the specified number of bytes into a buffer.
int	read(byte[] b, int off, int len) Reads the specified number of bytes into a buffer with offset and length specified.
long	skip(long n)

Methods inherited from class java.io.FilterInputStream

available, close, mark, markSupported, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

PdfFlateInputStream

public PdfFlateInputStream(InputStream is)

Constructor with null DecodeParms dictionary

Parameters:

is - InputStream to be inflated

PdfFlateInputStream

public PdfFlateInputStream(InputStream is,
                           PdfDictionary parms)

Constructor with specified DecodeParms dictionary

Parameters:

is - InputStream to be inflated

parms - DecodeParms dictionary. May be null, in which case this is equivalent to the one-parameter constructor.

Method Detail

read

public int read()
         throws IOException

Reads one byte from the stream. Returns -1 if end of file is reached.

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(byte[] b)
         throws IOException

Reads the specified number of bytes into a buffer. Returns the number of bytes actually read, or -1 if end of file has been reached.

Overrides:

read in class FilterInputStream

Throws:

IOException

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

Reads the specified number of bytes into a buffer with offset and length specified. Returns -1 if end of file has been reached. No matter how much is requested, this will only return one row's worth of data at most.

Overrides:

read in class FilterInputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class FilterInputStream

Throws:

IOException