diff options
Diffstat (limited to 'src/main/java/org/pdfbox/filter/LZWFilter.java')
| -rw-r--r-- | src/main/java/org/pdfbox/filter/LZWFilter.java | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/src/main/java/org/pdfbox/filter/LZWFilter.java b/src/main/java/org/pdfbox/filter/LZWFilter.java deleted file mode 100644 index e8ba003..0000000 --- a/src/main/java/org/pdfbox/filter/LZWFilter.java +++ /dev/null @@ -1,235 +0,0 @@ -/**
- * Copyright (c) 2003-2005, www.pdfbox.org
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- * 3. Neither the name of pdfbox; nor the names of its
- * contributors may be used to endorse or promote products derived from this
- * software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
- * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * http://www.pdfbox.org
- *
- */
-package org.pdfbox.filter;
-
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.io.PushbackInputStream;
-import java.io.StreamCorruptedException;
-
-import org.pdfbox.cos.COSDictionary;
-
-import org.pdfbox.io.NBitInputStream;
-import org.pdfbox.io.NBitOutputStream;
-
-/**
- * This is the used for the LZWDecode filter.
- *
- * @author Ben Litchfield (ben@benlitchfield.com)
- * @version $Revision: 1.13 $
- */
-public class LZWFilter implements Filter
-{
-
- /**
- * The LZW clear table code.
- */
- public static final long CLEAR_TABLE = 256;
- /**
- * The LZW end of data code.
- */
- public static final long EOD = 257;
-
- /**
- * This will decode some compressed data.
- *
- * @param compressedData The compressed byte stream.
- * @param result The place to write the uncompressed byte stream.
- * @param options The options to use to encode the data.
- *
- * @throws IOException If there is an error decompressing the stream.
- */
- public void decode( InputStream compressedData, OutputStream result, COSDictionary options ) throws IOException
- {
- //log.debug("decode( )");
- NBitInputStream in = null;
- in = new NBitInputStream( compressedData );
- in.setBitsInChunk( 9 );
- LZWDictionary dic = new LZWDictionary();
- byte firstByte = 0;
- long nextCommand = 0;
- while( (nextCommand = in.read() ) != EOD )
- {
- // log.debug( "decode - nextCommand=" + nextCommand + ", bitsInChunk: " + in.getBitsInChunk());
-
- if( nextCommand == CLEAR_TABLE )
- {
- in.setBitsInChunk( 9 );
- dic = new LZWDictionary();
- }
- else
- {
- byte[] data = dic.getData( nextCommand );
- if( data == null )
- {
- dic.visit( firstByte );
- data = dic.getData( nextCommand );
- dic.clear();
- }
- if( data == null )
- {
- throw new StreamCorruptedException( "Error: data is null" );
- }
- dic.visit(data);
-
- //log.debug( "decode - dic.getNextCode(): " + dic.getNextCode());
-
- if( dic.getNextCode() >= 2047 )
- {
- in.setBitsInChunk( 12 );
- }
- else if( dic.getNextCode() >= 1023 )
- {
- in.setBitsInChunk( 11 );
- }
- else if( dic.getNextCode() >= 511 )
- {
- in.setBitsInChunk( 10 );
- }
- else
- {
- in.setBitsInChunk( 9 );
- }
- /**
- if( in.getBitsInChunk() != dic.getCodeSize() )
- {
- in.unread( nextCommand );
- in.setBitsInChunk( dic.getCodeSize() );
- System.out.print( "Switching " + nextCommand + " to " );
- nextCommand = in.read();
- System.out.println( "" + nextCommand );
- data = dic.getData( nextCommand );
- }**/
- firstByte = data[0];
- result.write( data );
- }
- }
- result.flush();
- }
-
-
- /**
- * This will encode some data.
- *
- * @param rawData The raw data to encode.
- * @param result The place to write to encoded results to.
- * @param options The options to use to encode the data.
- *
- * @throws IOException If there is an error compressing the stream.
- */
- public void encode( InputStream rawData, OutputStream result, COSDictionary options ) throws IOException
- {
- //log.debug("encode( )");
- PushbackInputStream input = new PushbackInputStream( rawData, 4096 );
- LZWDictionary dic = new LZWDictionary();
- NBitOutputStream out = new NBitOutputStream( result );
- out.setBitsInChunk( 9 ); //initially nine
- out.write( CLEAR_TABLE );
- ByteArrayOutputStream buffer = new ByteArrayOutputStream();
- int byteRead = 0;
- for( int i=0; (byteRead = input.read()) != -1; i++ )
- {
- //log.debug( "byteRead = '" + (char)byteRead + "' (0x" + Integer.toHexString(byteRead) + "), i=" + i);
- buffer.write( byteRead );
- dic.visit( (byte)byteRead );
- out.setBitsInChunk( dic.getCodeSize() );
-
- //log.debug( "Getting node '" + new String( buffer.toByteArray() ) + "', buffer.size = " + buffer.size() );
- LZWNode node = dic.getNode( buffer.toByteArray() );
- int nextByte = input.read();
- if( nextByte != -1 )
- {
- //log.debug( "nextByte = '" + (char)nextByte + "' (0x" + Integer.toHexString(nextByte) + ")");
- LZWNode next = node.getNode( (byte)nextByte );
- if( next == null )
- {
- //log.debug("encode - No next node, writing node and resetting buffer (" +
- // " node.getCode: " + node.getCode() + ")" +
- // " bitsInChunk: " + out.getBitsInChunk() +
- // ")");
- out.write( node.getCode() );
- buffer.reset();
- }
-
- input.unread( nextByte );
- }
- else
- {
- //log.debug("encode - EOF on lookahead: writing node, resetting buffer, and terminating read loop (" +
- // " node.getCode: " + node.getCode() + ")" +
- // " bitsInChunk: " + out.getBitsInChunk() +
- // ")");
- out.write( node.getCode() );
- buffer.reset();
- break;
- }
-
- if( dic.getNextCode() == 4096 )
- {
- //log.debug("encode - Clearing dictionary and unreading pending buffer data (" +
- // " bitsInChunk: " + out.getBitsInChunk() +
- // ")");
- out.write( CLEAR_TABLE );
- dic = new LZWDictionary();
- input.unread( buffer.toByteArray() );
- buffer.reset();
- }
- }
-
- // Fix the code size based on the fact that we are writing the EOD
- //
- if( dic.getNextCode() >= 2047 )
- {
- out.setBitsInChunk( 12 );
- }
- else if( dic.getNextCode() >= 1023 )
- {
- out.setBitsInChunk( 11 );
- }
- else if( dic.getNextCode() >= 511 )
- {
- out.setBitsInChunk( 10 );
- }
- else
- {
- out.setBitsInChunk( 9 );
- }
-
- //log.debug("encode - Writing EOD (" +
- // " bitsInChunk: " + out.getBitsInChunk() +
- // ")");
- out.write( EOD );
- out.close();
- result.flush();
- }
-}
\ No newline at end of file |