multivalent.std.adaptor.pdf
Class InputStreamComposite

java.lang.Object
  java.io.InputStream
      multivalent.std.adaptor.pdf.InputStreamComposite

public class InputStreamComposite

extends java.io.InputStream

Merges possibly multiple component InputStreams, possibly with encodings such as Flate and ASCIIHex, possibly with a Predictor (on LZW or Flate), possibly encrypted. Does not expand out image-specific filters (DCT, FAX, JBIG2). Allows one character of unread(int) and peek().

Version:

$Revision: 1.30 $ $Date: 2005/03/22 04:58:19 $

See Also:

DecodeASCIIHex, DecodeRunLength, InputStreamASCII85, InputStreamLZW, InflaterInputStream, DecodePredictor

Constructor Summary

InputStreamComposite(java.lang.Object obj, boolean iscontent, PDFReader pdfr)
Returns stream of buffered, decrypted, uncompressed data; image filters not processed.

Method Summary

int	available()
void	close()
void	mark(int readlimit)
boolean	markSupported() If no filter, true; else false.
int	peek() Returns next character without advancing file position pointer, so that next peek() or read() returns same character at same position.
int	read()
int	read(byte[] b, int off, int len)
void	reset()
long	skip(long n)
void	unread(int c) Pushes back one character of stream, so that the next read() will return it.

Methods inherited from class java.io.InputStream

read

Methods inherited from class java.lang.Object

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

Constructor Detail

InputStreamComposite

public InputStreamComposite(java.lang.Object obj,
                            boolean iscontent,
                            PDFReader pdfr)
                     throws java.io.IOException

Returns stream of buffered, decrypted, uncompressed data; image filters not processed. Referenced stream dictionary (via IRef, Object[], or direct Dict) can supply inline data by setting COS.STREAM_DATA key with byte[].

Parameters:

obj - can be COS.CLASS_DICTIONARY for stream with filters, IRef to stream or array or streams, Object[] of IRef's to stream, or COS.CLASS_DATA for final data requiring no filters.

iscontent - declare whether stream corresponds to page contents, and if so insert extra space between each pair of substreams, to handle corner case where concatenated streams don't have such space and would concatenate commands or arguments.

Throws:

java.io.IOException

Method Detail

peek

public int peek()
         throws java.io.IOException

Returns next character without advancing file position pointer, so that next peek() or read() returns same character at same position. Side effect: pushback character is set.

Throws:

java.io.IOException

unread

public void unread(int c)

Pushes back one character of stream, so that the next read() will return it.

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

read

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

Overrides:

read in class java.io.InputStream

Throws:

java.io.IOException

markSupported

public boolean markSupported()

If no filter, true; else false.

Overrides:

markSupported in class java.io.InputStream

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException

mark

public void mark(int readlimit)

Overrides:

mark in class java.io.InputStream

close

public void close()
           throws java.io.IOException

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException

skip

public long skip(long n)
          throws java.io.IOException

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException