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Posted to commits@pdfbox.apache.org by le...@apache.org on 2022/01/04 09:33:08 UTC
[pdfbox-jbig2] branch master updated: PDFBOX-5220: reduce the exposure of the byte array of a Bitmap
This is an automated email from the ASF dual-hosted git repository.
lehmi pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/pdfbox-jbig2.git
The following commit(s) were added to refs/heads/master by this push:
new 00bce1e PDFBOX-5220: reduce the exposure of the byte array of a Bitmap
00bce1e is described below
commit 00bce1e7f1987b064d400f2fcc46fd2dad1184ae
Author: Andreas Lehmkühler <an...@lehmi.de>
AuthorDate: Tue Jan 4 10:32:51 2022 +0100
PDFBOX-5220: reduce the exposure of the byte array of a Bitmap
---
src/main/java/org/apache/pdfbox/jbig2/Bitmap.java | 42 +++++++++++++++
.../java/org/apache/pdfbox/jbig2/JBIG2Page.java | 2 +-
.../org/apache/pdfbox/jbig2/image/Bitmaps.java | 2 +-
.../pdfbox/jbig2/segments/HalftoneRegion.java | 2 +-
.../pdfbox/jbig2/segments/SymbolDictionary.java | 2 +-
.../apache/pdfbox/jbig2/segments/TextRegion.java | 2 +-
.../apache/pdfbox/jbig2/ChecksumCalculator.java | 62 ----------------------
.../org/apache/pdfbox/jbig2/GithubIssuesTest.java | 9 +++-
.../jbig2/decoder/mmr/MMRDecompressorTest.java | 10 ++--
.../apache/pdfbox/jbig2/image/BitmapsBlitTest.java | 12 ++---
10 files changed, 65 insertions(+), 80 deletions(-)
diff --git a/src/main/java/org/apache/pdfbox/jbig2/Bitmap.java b/src/main/java/org/apache/pdfbox/jbig2/Bitmap.java
index 96c2250..b186e9f 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/Bitmap.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/Bitmap.java
@@ -18,6 +18,7 @@
package org.apache.pdfbox.jbig2;
import java.awt.Rectangle;
+import java.util.Arrays;
/**
* This class represents a bi-level image that is organized like a bitmap.
@@ -104,6 +105,8 @@ public class Bitmap
* Simply returns the byte array of this bitmap.
*
* @return The byte array of this bitmap.
+ *
+ * @deprecated don't expose the underlying byte array, will be removed in a future release.
*/
public byte[] getByteArray()
{
@@ -202,8 +205,47 @@ public class Bitmap
return new Rectangle(0, 0, width, height);
}
+ /**
+ * Returns the length of the underlying byte array.
+ *
+ * @return byte array length
+ *
+ * @deprecated renamed, will be removed in a future release. Use {@link Bitmap#getLength()} instead.
+ */
public int getMemorySize()
{
+ return getLength();
+ }
+
+ /**
+ * Returns the length of the underlying byte array.
+ *
+ * @return byte array length
+ */
+ public int getLength()
+ {
return bitmap.length;
}
+
+ /**
+ * Fill the underlying bitmap with the given byte value.
+ *
+ * @param fillByte the value to be stored in all elements of the bitmap
+ */
+ public void fillBitmap(byte fillByte)
+ {
+ Arrays.fill(bitmap, fillByte);
+ }
+
+ @Override
+ public boolean equals(Object obj)
+ {
+ // most likely used for tests
+ if (!(obj instanceof Bitmap))
+ {
+ return false;
+ }
+ Bitmap other = (Bitmap)obj;
+ return Arrays.equals(bitmap, other.bitmap);
+ }
}
diff --git a/src/main/java/org/apache/pdfbox/jbig2/JBIG2Page.java b/src/main/java/org/apache/pdfbox/jbig2/JBIG2Page.java
index 41fcbec..6c9cc75 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/JBIG2Page.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/JBIG2Page.java
@@ -162,7 +162,7 @@ class JBIG2Page
// If default pixel value is not 0, byte will be filled with 0xff
if (pageInformation.getDefaultPixelValue() != 0)
{
- Arrays.fill(pageBitmap.getByteArray(), (byte) 0xff);
+ pageBitmap.fillBitmap((byte) 0xff);
}
for (SegmentHeader s : segments.values())
diff --git a/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java b/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java
index 255ea22..c32aeaa 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java
@@ -365,7 +365,7 @@ public class Bitmaps
for (int x = firstSourceByteOfLine; x < lastSourceByteOfLine; x++)
{
- if (sourceOffset + 1 < src.getByteArray().length)
+ if (sourceOffset + 1 < src.getLength())
{
final boolean isLastByte = x + 1 == lastSourceByteOfLine;
byte value = (byte) (src.getByte(sourceOffset++) << sourceUpShift
diff --git a/src/main/java/org/apache/pdfbox/jbig2/segments/HalftoneRegion.java b/src/main/java/org/apache/pdfbox/jbig2/segments/HalftoneRegion.java
index ddac8d9..7dc6c0a 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/segments/HalftoneRegion.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/segments/HalftoneRegion.java
@@ -165,7 +165,7 @@ public class HalftoneRegion implements Region
if (hDefaultPixel == 1)
{
- Arrays.fill(halftoneRegionBitmap.getByteArray(), (byte) 0xff);
+ halftoneRegionBitmap.fillBitmap((byte) 0xff);
}
/* 2) */
diff --git a/src/main/java/org/apache/pdfbox/jbig2/segments/SymbolDictionary.java b/src/main/java/org/apache/pdfbox/jbig2/segments/SymbolDictionary.java
index bf6c343..5837b7c 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/segments/SymbolDictionary.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/segments/SymbolDictionary.java
@@ -807,7 +807,7 @@ public class SymbolDictionary implements Dictionary
{
final Bitmap heightClassCollectiveBitmap = new Bitmap(totalWidth, heightClassHeight);
- for (int i = 0; i < heightClassCollectiveBitmap.getByteArray().length; i++)
+ for (int i = 0; i < heightClassCollectiveBitmap.getLength(); i++)
{
heightClassCollectiveBitmap.setByte(i, subInputStream.readByte());
}
diff --git a/src/main/java/org/apache/pdfbox/jbig2/segments/TextRegion.java b/src/main/java/org/apache/pdfbox/jbig2/segments/TextRegion.java
index 4aaaf49..8e5e38b 100644
--- a/src/main/java/org/apache/pdfbox/jbig2/segments/TextRegion.java
+++ b/src/main/java/org/apache/pdfbox/jbig2/segments/TextRegion.java
@@ -387,7 +387,7 @@ public class TextRegion implements Region
/* 1) */
if (defaultPixel != 0)
{
- Arrays.fill(regionBitmap.getByteArray(), (byte) 0xff);
+ regionBitmap.fillBitmap((byte) 0xff);
}
}
diff --git a/src/test/java/org/apache/pdfbox/jbig2/ChecksumCalculator.java b/src/test/java/org/apache/pdfbox/jbig2/ChecksumCalculator.java
deleted file mode 100644
index 8cacc8f..0000000
--- a/src/test/java/org/apache/pdfbox/jbig2/ChecksumCalculator.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package org.apache.pdfbox.jbig2;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.security.MessageDigest;
-import java.security.NoSuchAlgorithmException;
-import java.util.Arrays;
-
-import javax.imageio.stream.ImageInputStream;
-
-import org.apache.pdfbox.jbig2.err.JBIG2Exception;
-import org.apache.pdfbox.jbig2.io.DefaultInputStreamFactory;
-import org.junit.Ignore;
-import org.junit.Test;
-
-@Ignore
-public class ChecksumCalculator
-{
-
- @Ignore
- @Test
- public void computeChecksum() throws NoSuchAlgorithmException, IOException, JBIG2Exception
- {
- String filepath = "/images/sampledata_page3.jb2";
- int pageNumber = 1;
-
- InputStream is = getClass().getResourceAsStream(filepath);
- DefaultInputStreamFactory disf = new DefaultInputStreamFactory();
- ImageInputStream iis = disf.getInputStream(is);
- JBIG2Document doc = new JBIG2Document(iis);
- Bitmap bitmap = doc.getPage(pageNumber).getBitmap();
-
- byte[] md5 = md5(bitmap);
- for (byte b : md5)
- {
- System.out.print(b);
- }
- System.out.println(Arrays.toString(md5));
- }
-
- public static byte[] md5(Bitmap b) throws NoSuchAlgorithmException
- {
- return MessageDigest.getInstance("MD5").digest(b.getByteArray());
- }
-}
diff --git a/src/test/java/org/apache/pdfbox/jbig2/GithubIssuesTest.java b/src/test/java/org/apache/pdfbox/jbig2/GithubIssuesTest.java
index e4ceb00..c695b86 100644
--- a/src/test/java/org/apache/pdfbox/jbig2/GithubIssuesTest.java
+++ b/src/test/java/org/apache/pdfbox/jbig2/GithubIssuesTest.java
@@ -17,10 +17,11 @@
package org.apache.pdfbox.jbig2;
-import static org.apache.pdfbox.jbig2.ChecksumCalculator.md5;
import static org.apache.pdfbox.jbig2.JBIG2DocumentFacade.doc;
import java.io.InputStream;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageInputStream;
@@ -69,4 +70,10 @@ public class GithubIssuesTest
}
}
+
+ private static byte[] md5(Bitmap b) throws NoSuchAlgorithmException
+ {
+ return MessageDigest.getInstance("MD5").digest(b.getByteArray());
+ }
+
}
diff --git a/src/test/java/org/apache/pdfbox/jbig2/decoder/mmr/MMRDecompressorTest.java b/src/test/java/org/apache/pdfbox/jbig2/decoder/mmr/MMRDecompressorTest.java
index e64ee22..2c4fd3c 100644
--- a/src/test/java/org/apache/pdfbox/jbig2/decoder/mmr/MMRDecompressorTest.java
+++ b/src/test/java/org/apache/pdfbox/jbig2/decoder/mmr/MMRDecompressorTest.java
@@ -17,7 +17,7 @@
package org.apache.pdfbox.jbig2.decoder.mmr;
-import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;
import java.io.File;
@@ -42,6 +42,11 @@ public class MMRDecompressorTest
final byte[] expected = new byte[] { 0, 0, 2, 34, 38, 102, -17, -1, 2, 102, 102, //
-18, -18, -17, -1, -1, 0, 2, 102, 102, 127, //
-1, -1, -1, 0, 0, 0, 4, 68, 102, 102, 127 };
+ final Bitmap expectedBitmap = new Bitmap(16 * 4, 4);
+ for(int i = 0; i < expected.length; i++ )
+ {
+ expectedBitmap.setByte(i, expected[i]);
+ }
final File inputFile = new File("target/images/sampledata.jb2");
// skip test if input stream isn't available
@@ -58,8 +63,7 @@ public class MMRDecompressorTest
final MMRDecompressor mmrd = new MMRDecompressor(16 * 4, 4, sis);
final Bitmap b = mmrd.uncompress();
- final byte[] actual = b.getByteArray();
- assertArrayEquals(expected, actual);
+ assertTrue(expectedBitmap.equals(b));
}
}
diff --git a/src/test/java/org/apache/pdfbox/jbig2/image/BitmapsBlitTest.java b/src/test/java/org/apache/pdfbox/jbig2/image/BitmapsBlitTest.java
index 67958bc..ba1126d 100644
--- a/src/test/java/org/apache/pdfbox/jbig2/image/BitmapsBlitTest.java
+++ b/src/test/java/org/apache/pdfbox/jbig2/image/BitmapsBlitTest.java
@@ -17,7 +17,7 @@
package org.apache.pdfbox.jbig2.image;
-import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;
import java.awt.Rectangle;
@@ -57,10 +57,7 @@ public class BitmapsBlitTest
final Bitmap dst = new Bitmap(src.getWidth(), src.getHeight());
Bitmaps.blit(src, dst, 0, 0, CombinationOperator.REPLACE);
- final byte[] srcData = src.getByteArray();
- final byte[] dstData = dst.getByteArray();
-
- assertArrayEquals(srcData, dstData);
+ assertTrue(src.equals(dst));
}
@Test
@@ -86,10 +83,7 @@ public class BitmapsBlitTest
final Bitmap dstRegionBitmap = Bitmaps.extract(roi, dst);
- final byte[] srcData = src.getByteArray();
- final byte[] dstRegionData = dstRegionBitmap.getByteArray();
-
- assertArrayEquals(srcData, dstRegionData);
+ assertTrue(src.equals(dstRegionBitmap));
}
}