diff options
Diffstat (limited to 'src/main/java/org/pdfbox/filter/FlateFilter.java')
| -rw-r--r-- | src/main/java/org/pdfbox/filter/FlateFilter.java | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/src/main/java/org/pdfbox/filter/FlateFilter.java b/src/main/java/org/pdfbox/filter/FlateFilter.java deleted file mode 100644 index c239686..0000000 --- a/src/main/java/org/pdfbox/filter/FlateFilter.java +++ /dev/null @@ -1,303 +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.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-import java.util.zip.DeflaterOutputStream;
-import java.util.zip.InflaterInputStream;
-
-import org.pdfbox.cos.COSDictionary;
-
-/**
- * This is the used for the FlateDecode filter.
- *
- * @author Ben Litchfield (ben@benlitchfield.com)
- * @author Marcel Kammer
- * @version $Revision: 1.9 $
- */
-public class FlateFilter implements Filter
-{
- private static final int BUFFER_SIZE = 2048;
-
- /**
- * 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
- {
- COSDictionary dict = (COSDictionary) options.getDictionaryObject("DecodeParms");
- int predictor = -1;
- int colors = -1;
- int bitsPerPixel = -1;
- int columns = -1;
- InflaterInputStream decompressor = null;
- ByteArrayInputStream bais = null;
- ByteArrayOutputStream baos = null;
- if (dict!=null)
- {
- predictor = dict.getInt("Predictor");
- colors = dict.getInt("Colors");
- bitsPerPixel = options.getInt("BitsPerComponent");
- columns = dict.getInt("Columns");
- }
-
- try
- {
- // Decompress data to temporary ByteArrayOutputStream
- decompressor = new InflaterInputStream(compressedData);
- byte[] buffer = new byte[BUFFER_SIZE];
- int amountRead;
-
- // Decode data using given predictor
- if (predictor==-1 || predictor == 1 && predictor == 10)
- {
- // decoding not needed
- while ((amountRead = decompressor.read(buffer, 0, BUFFER_SIZE)) != -1)
- {
- result.write(buffer, 0, amountRead);
- }
- }
- else
- {
- if (colors==-1 || bitsPerPixel==-1 || columns==-1)
- {
- throw new IOException("Could not read all parameters to decode image");
- }
-
- baos = new ByteArrayOutputStream();
- while ((amountRead = decompressor.read(buffer, 0, BUFFER_SIZE)) != -1)
- {
- baos.write(buffer, 0, amountRead);
- }
- baos.flush();
-
- // Copy data to ByteArrayInputStream for reading
- bais = new ByteArrayInputStream(baos.toByteArray());
- baos.close();
- baos = null;
-
- byte[] decodedData = decodePredictor(predictor, colors, bitsPerPixel, columns, bais);
- bais.close();
- bais = new ByteArrayInputStream(decodedData);
-
- // write decoded data to result
- while ((amountRead = bais.read(buffer)) != -1)
- {
- result.write(buffer, 0, amountRead);
- }
- bais.close();
- bais = null;
- }
-
-
- result.flush();
- }
- finally
- {
- if (decompressor != null)
- {
- decompressor.close();
- }
- if (bais != null)
- {
- bais.close();
- }
- if (baos != null)
- {
- baos.close();
- }
- }
- }
-
- private byte[] decodePredictor(int predictor, int colors, int bitsPerComponent, int columns, InputStream data)
- throws IOException
- {
- ByteArrayOutputStream baos = new ByteArrayOutputStream();
- byte[] buffer = new byte[2048];
-
- if (predictor == 1 || predictor == 10)
- {
- // No prediction or PNG NONE
- int i = 0;
- while ((i = data.read(buffer)) != -1)
- {
- baos.write(buffer, 0, i);
- }
- }
- else
- {
- // calculate sizes
- int bpp = (colors * bitsPerComponent + 7) / 8;
- int rowlength = (columns * colors * bitsPerComponent + 7) / 8 + bpp;
- byte[] actline = new byte[rowlength];
- byte[] lastline = new byte[rowlength];// Initialize lastline with
- // Zeros according to
- // PNG-specification
- boolean done = false;
- int linepredictor = predictor;
-
- while (!done)
- {
- if (predictor == 15)
- {
- linepredictor = data.read();// read per line predictor
- if (linepredictor == -1)
- {
- done = true;// reached EOF
- break;
- }
- else
- {
- linepredictor += 10; // add 10 to tread value 1 as 11
- }
- // (instead of PRED NONE) and 2
- // as 12 (instead of PRED TIFF)
- }
-
- // read line
- int i = 0;
- int offset = bpp;
- while (offset < rowlength && ((i = data.read(actline, offset, rowlength - offset)) != -1))
- {
- offset += i;
- }
-
- // Do prediction as specified in PNG-Specification 1.2
- switch (linepredictor)
- {
- case 2:// PRED TIFF SUB
- /**
- * @todo decode tiff
- */
- throw new IOException("TIFF-Predictor not supported");
- case 11:// PRED SUB
- for (int p = bpp; p < rowlength; p++)
- {
- int sub = actline[p] & 0xff;
- int left = actline[p - bpp] & 0xff;
- actline[p] = (byte) (sub + left);
- }
- break;
- case 12:// PRED UP
- for (int p = bpp; p < rowlength; p++)
- {
- int up = actline[p] & 0xff;
- int prior = lastline[p] & 0xff;
- actline[p] = (byte) (up + prior);
- }
- break;
- case 13:// PRED AVG
- for (int p = bpp; p < rowlength; p++)
- {
- int avg = actline[p] & 0xff;
- int left = actline[p - bpp] & 0xff;
- int up = lastline[p] & 0xff;
- actline[p] = (byte) (avg + ((left + up) / 2));
- }
- break;
- case 14:// PRED PAETH
- for (int p = bpp; p < rowlength; p++)
- {
- int paeth = actline[p] & 0xff;
- int a = actline[p - bpp] & 0xff;// left
- int b = lastline[p] & 0xff;// upper
- int c = lastline[p - bpp] & 0xff;// upperleft
- int value = a + b - c;
- int absa = Math.abs(value - a);
- int absb = Math.abs(value - b);
- int absc = Math.abs(value - c);
-
- if (absa <= absb && absa <= absc)
- {
- actline[p] = (byte) (paeth + absa);
- }
- else if (absb <= absc)
- {
- actline[p] += (byte) (paeth + absb);
- }
- else
- {
- actline[p] += (byte) (paeth + absc);
- }
- }
- break;
- default:
- break;
- }
-
- lastline = actline;
- baos.write(actline, bpp, actline.length - bpp);
- }
- }
-
- return baos.toByteArray();
- }
-
- /**
- * 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
- {
- DeflaterOutputStream out = new DeflaterOutputStream(result);
- byte[] buffer = new byte[BUFFER_SIZE];
- int amountRead = 0;
- while ((amountRead = rawData.read(buffer, 0, BUFFER_SIZE)) != -1)
- {
- out.write(buffer, 0, amountRead);
- }
- out.close();
- result.flush();
- }
-}
\ No newline at end of file |