Initial HDGF support for streams, plus tests
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@548476 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Nick Burch
parent
407d10ffd1
commit
ca88624f6f
@ -0,0 +1,62 @@
|
||||
/**
|
||||
*
|
||||
*/
|
||||
package org.apache.poi.hdgf.streams;
|
||||
|
||||
import java.io.ByteArrayInputStream;
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.poi.hdgf.LZW4HDGF;
|
||||
|
||||
class CompressedStreamStore extends StreamStore {
|
||||
/** The raw, compressed contents */
|
||||
private byte[] compressedContents;
|
||||
/**
|
||||
* We're not sure what this is, but it comes before the
|
||||
* real contents in the de-compressed data
|
||||
*/
|
||||
private byte[] blockHeader = new byte[4];
|
||||
|
||||
protected byte[] _getCompressedContents() { return compressedContents; }
|
||||
protected byte[] _getBlockHeader() { return blockHeader; }
|
||||
|
||||
/**
|
||||
* Creates a new compressed StreamStore, which will handle
|
||||
* the decompression.
|
||||
*/
|
||||
protected CompressedStreamStore(byte[] data, int offset, int length) throws IOException {
|
||||
this(decompress(data,offset,length));
|
||||
|
||||
compressedContents = new byte[length];
|
||||
System.arraycopy(data, offset, compressedContents, 0, length);
|
||||
}
|
||||
/**
|
||||
* Handles passing the de-compressed data onto our superclass.
|
||||
*/
|
||||
private CompressedStreamStore(byte[][] decompressedData) {
|
||||
super(decompressedData[1], 0, decompressedData[1].length);
|
||||
blockHeader = decompressedData[0];
|
||||
}
|
||||
|
||||
/**
|
||||
* Decompresses the given data, returning it as header + contents
|
||||
*/
|
||||
public static byte[][] decompress(byte[] data, int offset, int length) throws IOException {
|
||||
ByteArrayInputStream bais = new ByteArrayInputStream(data, offset, length);
|
||||
|
||||
// Decompress
|
||||
LZW4HDGF lzw = new LZW4HDGF();
|
||||
byte[] decompressed = lzw.decode(bais);
|
||||
|
||||
// Split into header and contents
|
||||
byte[][] ret = new byte[2][];
|
||||
ret[0] = new byte[4];
|
||||
ret[1] = new byte[decompressed.length - 4];
|
||||
|
||||
System.arraycopy(decompressed, 0, ret[0], 0, 4);
|
||||
System.arraycopy(decompressed, 4, ret[1], 0, ret[1].length);
|
||||
|
||||
// All done
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
75
src/scratchpad/src/org/apache/poi/hdgf/streams/Stream.java
Normal file
75
src/scratchpad/src/org/apache/poi/hdgf/streams/Stream.java
Normal file
@ -0,0 +1,75 @@
|
||||
/* ====================================================================
|
||||
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.poi.hdgf.streams;
|
||||
|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.poi.hdgf.pointers.Pointer;
|
||||
|
||||
/**
|
||||
* Base of all Streams within a HDGF document.
|
||||
* Streams are what hold the data (the metadata of a stream
|
||||
* is held in the pointer that points to the stream).
|
||||
* A stream may be stored compressed or un-compressed on the
|
||||
* disk, but that doesn't appear to change their use.
|
||||
*/
|
||||
public abstract class Stream {
|
||||
private Pointer pointer;
|
||||
private StreamStore store;
|
||||
|
||||
public Pointer getPointer() { return pointer; }
|
||||
protected StreamStore getStore() { return store; }
|
||||
|
||||
/**
|
||||
* Creates a new Stream, having already used the pointer
|
||||
* to build a store
|
||||
*/
|
||||
protected Stream(Pointer pointer, StreamStore store) {
|
||||
this.pointer = pointer;
|
||||
this.store = store;
|
||||
}
|
||||
|
||||
/**
|
||||
* Uses the pointer to locate a Stream within the document
|
||||
* data, and creates it.
|
||||
* @param pointer The Pointer to create a stream for
|
||||
* @param documentData The raw document data
|
||||
*/
|
||||
public static Stream createStream(Pointer pointer, byte[] documentData) {
|
||||
// Create the store
|
||||
StreamStore store;
|
||||
if(pointer.destinationCompressed()) {
|
||||
try {
|
||||
store = new CompressedStreamStore(
|
||||
documentData, pointer.getOffset(), pointer.getLength()
|
||||
);
|
||||
} catch(IOException e) {
|
||||
// Should never occur
|
||||
throw new IllegalStateException(e);
|
||||
}
|
||||
} else {
|
||||
store = new StreamStore(
|
||||
documentData, pointer.getOffset(), pointer.getLength()
|
||||
);
|
||||
}
|
||||
|
||||
// Figure out what sort of Stream to create, and create it
|
||||
|
||||
// Give up and return a generic one
|
||||
return new UnknownStream(pointer, store);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,20 @@
|
||||
package org.apache.poi.hdgf.streams;
|
||||
|
||||
/**
|
||||
* Holds the representation of the stream on-disk, and
|
||||
* handles de-compressing it as required.
|
||||
* In future, may also handle writing it back out again
|
||||
*/
|
||||
class StreamStore {
|
||||
private byte[] contents;
|
||||
|
||||
/**
|
||||
* Creates a new, non compressed Stream Store
|
||||
*/
|
||||
protected StreamStore(byte[] data, int offset, int length) {
|
||||
contents = new byte[length];
|
||||
System.arraycopy(data, offset, contents, 0, length);
|
||||
}
|
||||
|
||||
protected byte[] getContents() { return contents; }
|
||||
}
|
||||
@ -0,0 +1,29 @@
|
||||
/* ====================================================================
|
||||
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.poi.hdgf.streams;
|
||||
|
||||
import org.apache.poi.hdgf.pointers.Pointer;
|
||||
|
||||
/**
|
||||
* A placeholder for a stream where we don't known anything
|
||||
* about how to process / handle it
|
||||
*/
|
||||
public class UnknownStream extends Stream {
|
||||
protected UnknownStream(Pointer pointer, StreamStore store) {
|
||||
super(pointer, store);
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,127 @@
|
||||
package org.apache.poi.hdgf.streams;
|
||||
|
||||
import org.apache.poi.hdgf.pointers.Pointer;
|
||||
import org.apache.poi.hdgf.pointers.PointerV6;
|
||||
|
||||
import junit.framework.TestCase;
|
||||
|
||||
public class TestStreamBasics extends TestCase {
|
||||
/** The header from when compressedStream is decompressed */
|
||||
public static final byte[] compressedStreamDCHeader = new byte[] {
|
||||
-60, 2, 0, 0
|
||||
};
|
||||
public static final byte[] compressedStream = new byte[] {
|
||||
123, -60, 2, -21, -16, 1, 0, 0, -72, -13, -16, 78, -32, -5, 1,
|
||||
0, 3, -21, -16, 10, 5, 4, -21, -16, 21, 9, -21, -16, 103, -21,
|
||||
-16, 34, -36, -1, 52, 15, 70, 15, 120, 88, 15, -7, -2, -28, -9,
|
||||
-123, 21, 0, 44, -122, 1, -4, 104, 15, -24, -13, 40, -98, 32,
|
||||
78, 102, -67, -1, -2, -30, 64, 40, -67, -113, -73, 116, -98,
|
||||
-85, 2, 66, 123, 9, 109, -85, 2, -89, 14, -56, -69, -83, -79,
|
||||
-34, -3, 120, 110, 75, -9, -10, 20, -6, -25, -12, 22, -21, -16,
|
||||
-12, -81, 67, 1, -128, -70, -21, -16, 84, -21, -16, 70, 0, 23,
|
||||
-21, -16, 76, 47, -40, 79, 1, -44, -21, -16, 32, 3, 18, 12, 17,
|
||||
-43, -68, 17, 16, -8, 21, 22, -1, -21, -16, -84, -1, -35, 79,
|
||||
-9, -10, 96, 0, 46, -21, -16, 44, -39, -41, 79, 1, 119, -13,
|
||||
-16, -106, -13, -16, 84, 0, 125, 26, -21, -16, 68, -38, 79, 1,
|
||||
17, 10, 0, -97, 50, 10, 0, 0, -42, -108, 15, 118, 31, 0, -3, 29,
|
||||
-21, -16, -100, -25, 79, 1, -18, 97, -36, 76, 16, -21, -16, 86,
|
||||
0, 36, -5, 1, -5, 79, 63, 1, -124, 98, 0, 0, 28, 3, 20, -34, -3,
|
||||
125, 33, -21, -16, 100, -4, 79, 1, -92, -91, 16, -22, 24, 19, 41,
|
||||
-21, -16, -44, -59, 16, 108, 100, 0, -21, 0, 71, -105, 18, 39, 85,
|
||||
17, -3, 79, 1, 95, -108, 113, 0, 0, 104, 3, 18, 49, 49, 17, -1, 64,
|
||||
85, 1, 0, 114, 0, 0, -93, -36, -21, -16, 100, 31, 0, 0, -40, -21,
|
||||
-16, -92, 66, 127, 85, 1, 98, 119, 0, 0, -48, 79, 18, -3, 50, -17,
|
||||
1, 67, 85, 1, 81, -127, 0, -41, 0, 14, 6, 4, 17, 63, -63, 17, 68,
|
||||
85, -65, 1, 30, -120, 0, 0, 42, 79, 18, 68, 126, -21, -16, -76, 69,
|
||||
85, 1, 102, -119, 72, 37, 0, 97, 33 };
|
||||
public static final byte[] uncompressedStream = new byte[] {
|
||||
0, 1, 0, 0, -72, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 0, 3, 0, 0, 0, 3, 0, 0, 0, 3, 0, 0, 0, 4, 0, 0,
|
||||
0, 9, 0, 0, 0, 103, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
-123, 21, 0, 44, -123, 21, 0, 44, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 40, -98, 32, 78, 102, -67,
|
||||
-2, -30, 64, 40, -67, -113, -73, 116, -67, -2, -30, 64, 40, 66,
|
||||
123, 9, 109, -67, -2, -30, 64, 40, -98, 32, 78, 102, -67, -2, -30,
|
||||
64, 40, -67, -113, -73, 116, -67, -2, -30, 64, -56, -83, -79, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 120, 110, 75, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 20, 0, 0, 0, 0, 0, 0, 0, 22, 0, 0, 0, -12, -81, 67,
|
||||
1, -128, 0, 0, 0, 84, 0, 0, 0, 70, 0, 23, 0, 0, 0, 76, -40, 79, 1,
|
||||
-44, 0, 0, 0, 32, 0, 0, 0, 84, 0, 23, 0, 0, 0, -68, -40, 79, 1, -8,
|
||||
0, 0, 0, 32, 0, 0, 0, 84, 0, -1, 0, 0, 0, -84, -1, 79, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 96, 0, 46, 0, 0, 0, 44, -39, 79, 1, 119, 1, 0, 0,
|
||||
-106, 1, 0, 0, 84, 0, 26, 0, 0, 0, 68, -38, 79, 1, 17, 3, 0, 0,
|
||||
50, 10, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
29, 0, 0, 0, -100, -25, 79, 1, -18, 97, 0, 0, -106, 0, 0, 0, 86, 0,
|
||||
36, 0, 0, 0, -12, -5, 79, 1, -124, 98, 0, 0, 28, 0, 0, 0, 84, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 0, 0, 0, 100,
|
||||
-4, 79, 1, -92, 98, 0, 0, 32, 0, 0, 0, 84, 0, 41, 0, 0, 0, -44, -4,
|
||||
79, 1, 108, 100, 0, 0, 71, 0, 0, 0, 86, 0, 39, 0, 0, 0, 68, -3, 79,
|
||||
1, -108, 113, 0, 0, 104, 0, 0, 0, 84, 0, 49, 0, 0, 0, -84, 64, 85,
|
||||
1, 0, 114, 0, 0, -93, 0, 0, 0, -42, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, -40, 0, 0, 0, -92, 66, 85, 1, 98, 119,
|
||||
0, 0, -48, 1, 0, 0, 84, 0, 50, 0, 0, 0, 20, 67, 85, 1, 81, -127,
|
||||
0, 0, 14, 6, 0, 0, 84, 0, 63, 0, 0, 0, 100, 68, 85, 1, 30, -120,
|
||||
0, 0, 42, 1, 0, 0, 84, 0, 68, 0, 0, 0, -76, 69, 85, 1, 102, -119,
|
||||
0, 0, 42, 1, 0, 0, 84, 0, 0, 0, 0, 0
|
||||
};
|
||||
|
||||
public void testCompressedStream() {
|
||||
// Create a fake pointer
|
||||
Pointer ptr = new TestPointer(true, 0, compressedStream.length, -1, (short)-1);
|
||||
// Now the stream
|
||||
Stream stream = Stream.createStream(ptr, compressedStream);
|
||||
|
||||
// Check
|
||||
assertNotNull(stream.getPointer());
|
||||
assertNotNull(stream.getStore());
|
||||
assertTrue(stream.getStore() instanceof StreamStore);
|
||||
assertTrue(stream.getStore() instanceof CompressedStreamStore);
|
||||
assertTrue(stream instanceof UnknownStream);
|
||||
|
||||
// Check the stream store
|
||||
CompressedStreamStore ss = (CompressedStreamStore)stream.getStore();
|
||||
assertEquals(4, ss._getBlockHeader().length);
|
||||
assertEquals(compressedStream.length, ss._getCompressedContents().length);
|
||||
assertEquals(uncompressedStream.length, ss.getContents().length);
|
||||
|
||||
for(int i=0; i<uncompressedStream.length; i++) {
|
||||
assertEquals(uncompressedStream[i], ss.getContents()[i]);
|
||||
}
|
||||
}
|
||||
|
||||
public void testUncompressedStream() {
|
||||
// Create a fake pointer
|
||||
Pointer ptr = new TestPointer(false, 0, uncompressedStream.length, -1, (short)-1);
|
||||
// Now the stream
|
||||
Stream stream = Stream.createStream(ptr, uncompressedStream);
|
||||
|
||||
// Check
|
||||
assertNotNull(stream.getPointer());
|
||||
assertNotNull(stream.getStore());
|
||||
assertTrue(stream.getStore() instanceof StreamStore);
|
||||
assertFalse(stream.getStore() instanceof CompressedStreamStore);
|
||||
assertTrue(stream instanceof UnknownStream);
|
||||
}
|
||||
|
||||
public static class TestPointer extends Pointer {
|
||||
private boolean compressed;
|
||||
public TestPointer(boolean compressed, int offset, int length, int type, short format) {
|
||||
this.compressed = compressed;
|
||||
this.offset = offset;
|
||||
this.length = length;
|
||||
this.type = type;
|
||||
this.format = format;
|
||||
}
|
||||
|
||||
public boolean destinationCompressed() { return compressed; }
|
||||
public boolean destinationHasChunks() { return false; }
|
||||
public boolean destinationHasPointers() { return false; }
|
||||
public boolean destinationHasStrings() { return false; }
|
||||
public int getSizeInBytes() { return -1; }
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user