[GitHub] [commons-compress] theobisproject opened a new pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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[GitHub] [commons-compress] theobisproject opened a new pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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theobisproject opened a new pull request #113:
URL: https://github.com/apache/commons-compress/pull/113


   Basic idea behind the implementation is to read all headers at instantiation and save the position to the entry data. This will then be accessed as a random access file when reading the entry.
   I tried to touch as less exisiting code as possible and only did refactor existing code were I felt it was really needed.
   
   I have the following TODOs left in the code where I think your opinion is needed
   
   - TarArchiveInputStream#canReadEntryData: as noted in the TODO sparse entries are now supported. I see no need for this function any longer and would not include it in the TarFile api. Also we should update the implementation to reflect the now supported sparse entries.
   - In the SparseFilesTest extracting of sparsefile-0.1 in pax_gnu_sparse.tar is skipped because of problems with tar on Ubuntu 16.04. I tested this on Ubuntu 18.04 and everything worked fine. Should we reenable extracting of the file?


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[GitHub] [commons-compress] coveralls commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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coveralls commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-654645643


   
   [![Coverage Status](https://coveralls.io/builds/31902640/badge)](https://coveralls.io/builds/31902640)
   
   Coverage increased (+0.03%) to 87.316% when pulling **01ea7d3d9fbb629c35f0a20407b8e3975cd07157 on theobisproject:random-access-tar** into **f41756f8024930384a60c5c57eb9eb2913ce1ae0 on apache:master**.
   


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[GitHub] [commons-compress] garydgregory commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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garydgregory commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-654812886


   From the sidelines here... I am wondering if the introduction of utility streams would not best be done by depending on Apache Commons IO which already contains a bounded stream for example. What's missing in Commons IO could be added there if general enough.


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[GitHub] [commons-compress] XenoAmess commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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XenoAmess commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-655583725


   Hi.
   suggestions:
   for BoundedSeekableByteChannelInputStream, please tell users if it is thread-safe in its javadoc.
   for BoundedNIOInputStream , please tell users if it is thread-safe in its javadoc.
   for BoundedNIOInputStream , please tell users if it is thread-safe in its javadoc.
   for TarArchiveSparseZeroInputStream, maybe this class should be added to commons-io instead.


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[GitHub] [commons-compress] theobisproject commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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theobisproject commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-656323828


   > I am wondering if the introduction of utility streams would not best be done by depending on Apache Commons IO which already contains a bounded stream for example
   
   As I understood commons-compress does purposefully not depend on Commons IO. This is something which I cannot decide to change.
   
   > for BoundedSeekableByteChannelInputStream, please tell users if it is thread-safe in its javadoc.
   for BoundedNIOInputStream , please tell users if it is thread-safe in its javadoc.
   
   I will add the information if the general design is accepted from the maintainers.
   
   > for TarArchiveSparseZeroInputStream, maybe this class should be added to commons-io instead.
   
   In my opinion this adds no value for Commons IO and should not be used outside of the tar implementation. I only moved this class to reuse it in both implementations and made it package protected so nobody outside the tar package will use it.


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[GitHub] [commons-compress] PeterAlfredLee commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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PeterAlfredLee commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-659805215


   > In my opinion this adds no value for Commons IO and should not be used outside of the tar implementation.
   
   +1. The `TarArchiveSparseZeroInputStream` will only return 0 if you are reading it. It's simple enough and I think this should be limited to tar in Commons Compress.


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[GitHub] [commons-compress] PeterAlfredLee commented on a change in pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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PeterAlfredLee commented on a change in pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#discussion_r456765778



##########
File path: src/main/java/org/apache/commons/compress/archivers/tar/TarArchiveInputStream.java
##########
@@ -1106,35 +917,8 @@ public int compare(final TarArchiveStructSparse p, final TarArchiveStructSparse
             }
         }
 
-        if (sparseInputStreams.size() > 0) {
+        if (!sparseInputStreams.isEmpty()) {
             currentSparseInputStreamIndex = 0;
         }
     }
-
-    /**
-     * This is an inputstream that always return 0,
-     * this is used when reading the "holes" of a sparse file
-     */
-    private static class TarArchiveSparseZeroInputStream extends InputStream {

Review comment:
       I did think about making the `TarArchiveSparseZeroInputStream` as a separate class instead of a inner class like you do now when I was writing it. I made it a private inner class cause I was thinking that this class could and should only be used here in `TarArchiveInputStream`.
    Not sure if making `TarArchiveSparseZeroInputStream` a separate class is a good idea or not.

##########
File path: src/main/java/org/apache/commons/compress/utils/BoundedNIOInputStream.java
##########
@@ -0,0 +1,97 @@
+/*
+ *  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.commons.compress.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * NIO backed bounded input stream for reading a predefined amount of data from.
+ * @since 1.21
+ */
+public abstract class BoundedNIOInputStream extends InputStream {

Review comment:
       The `BoundedInputStream` is renamed as `BoundedNIOInputStream` here. But the matter if it's a NIO input stream is depending on the implemention of abstract method `read` - which is decided by the inherited class.
   I don't like the name `BoundedNIOInputStream` as the word 'NIO' is confusing : we need to implement a NIO read to make this stream a NIO input stream.

##########
File path: src/main/java/org/apache/commons/compress/utils/BoundedSeekableByteChannelInputStream.java
##########
@@ -0,0 +1,56 @@
+/*
+ *  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.commons.compress.utils;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+
+/**
+ * InputStream that delegates requests to the underlying SeekableByteChannel, making sure that only bytes from a certain
+ * range can be read.
+ * @since 1.21
+ */
+public class BoundedSeekableByteChannelInputStream extends BoundedNIOInputStream {

Review comment:
       It seems `BoundedSeekableByteChannelInputStream` extends from `BoundedNIOInputStream` is exactly the same as the original inner class `BoundedInputStream` in `ZipFile`. It looks like that `BoundedSeekableByteChannelInputStream` is only used in `ZipFile` now. Is it so?

##########
File path: src/main/java/org/apache/commons/compress/archivers/tar/TarFile.java
##########
@@ -0,0 +1,712 @@
+/*
+ *  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.commons.compress.archivers.tar;
+
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.commons.compress.archivers.zip.ZipEncoding;
+import org.apache.commons.compress.archivers.zip.ZipEncodingHelper;
+import org.apache.commons.compress.utils.ArchiveUtils;
+import org.apache.commons.compress.utils.BoundedInputStream;
+import org.apache.commons.compress.utils.BoundedNIOInputStream;
+import org.apache.commons.compress.utils.BoundedSeekableByteChannelInputStream;
+import org.apache.commons.compress.utils.SeekableInMemoryByteChannel;
+
+/**
+ * The TarFile provides random access to UNIX to archives.
+ * @since 1.21
+ */
+public class TarFile implements Closeable {

Review comment:
       Many methods in `TarFile` looks pretty like the ones in `TarArchiveInputStream`(e.g. `buildSparseInputStreams`, `getLongNameData`,  `buildSparseInputStreams`). Maybe we can find some way to share these methods?




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[GitHub] [commons-compress] theobisproject commented on a change in pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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In reply to this post by GitBox

theobisproject commented on a change in pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#discussion_r457052857



##########
File path: src/main/java/org/apache/commons/compress/archivers/tar/TarArchiveInputStream.java
##########
@@ -1106,35 +917,8 @@ public int compare(final TarArchiveStructSparse p, final TarArchiveStructSparse
             }
         }
 
-        if (sparseInputStreams.size() > 0) {
+        if (!sparseInputStreams.isEmpty()) {
             currentSparseInputStreamIndex = 0;
         }
     }
-
-    /**
-     * This is an inputstream that always return 0,
-     * this is used when reading the "holes" of a sparse file
-     */
-    private static class TarArchiveSparseZeroInputStream extends InputStream {

Review comment:
       I moved this class out of the `TarArchiveInputStream` because I also needed it in the `TarFile`. Otherwise I would had to introduce more duplicated code. I made the class package private to prevent accidental usage.
   In my opinion before the changes done here it was reasonable to have this as inner class as this was only used here.

##########
File path: src/main/java/org/apache/commons/compress/utils/BoundedNIOInputStream.java
##########
@@ -0,0 +1,97 @@
+/*
+ *  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.commons.compress.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+
+/**
+ * NIO backed bounded input stream for reading a predefined amount of data from.
+ * @since 1.21
+ */
+public abstract class BoundedNIOInputStream extends InputStream {

Review comment:
       I agree that the name of the class it not perfect. Just wan't to share the reason why I took the name.
   
   The newly defined read method reads the content into an `java.nio.ByteBuffer` and the `read` methods of the `InputStream` are calling it. So the name comes more from the fact that an inherited class only needs to implement the new `read` method to the `ByteBuffer` and not from the actual underlying implementation. My experience shows that reading into a ByteBuffer from a non NIO source is not so much fun and therefore I put the `NIO` in the classname.
   
   If someone has a better suggestion for a classname it would be welcome.

##########
File path: src/main/java/org/apache/commons/compress/archivers/tar/TarFile.java
##########
@@ -0,0 +1,712 @@
+/*
+ *  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.commons.compress.archivers.tar;
+
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.commons.compress.archivers.zip.ZipEncoding;
+import org.apache.commons.compress.archivers.zip.ZipEncodingHelper;
+import org.apache.commons.compress.utils.ArchiveUtils;
+import org.apache.commons.compress.utils.BoundedInputStream;
+import org.apache.commons.compress.utils.BoundedNIOInputStream;
+import org.apache.commons.compress.utils.BoundedSeekableByteChannelInputStream;
+import org.apache.commons.compress.utils.SeekableInMemoryByteChannel;
+
+/**
+ * The TarFile provides random access to UNIX to archives.
+ * @since 1.21
+ */
+public class TarFile implements Closeable {

Review comment:
       The duplication is really on purpose from my side in the current state of the PR. I didn't wanted to limit myself to early from making the needed changes to get this work. Also I wanted to limit changes to existing code to avoid breaking it. Sharing some of the code can be quite a challenge because the data source is so different.
   `buildSparseInputStream`: The difference here is that the sparse streams are saved differently in the TarFile than in the Stream. In the TarFile the streams need to be saved on a per entry basis to allow random access. I think this could also be done in the stream but for the first version I didn't wanted to change too much existing code.
   `getLongNameData`: The only difference is the source from where the data is read (InputStream vs. SeekableByteChannel). A problem could be the call to `getNext(Tar)Entry` which has a lot of sideeffects.

##########
File path: src/main/java/org/apache/commons/compress/utils/BoundedSeekableByteChannelInputStream.java
##########
@@ -0,0 +1,56 @@
+/*
+ *  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.commons.compress.utils;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.SeekableByteChannel;
+
+/**
+ * InputStream that delegates requests to the underlying SeekableByteChannel, making sure that only bytes from a certain
+ * range can be read.
+ * @since 1.21
+ */
+public class BoundedSeekableByteChannelInputStream extends BoundedNIOInputStream {

Review comment:
       You are correct about the origin of the code. I moved it out of the `ZipFile` class because it is needed for reading sparse tar conent (see `TarFile` line 377)




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[GitHub] [commons-compress] bodewig commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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bodewig commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-662513731


   Unfortunately I've been unable to do a real review so far. $life is just setting different priorities right now. A few more or less unsorted thoughts:
   
   * I really wish Compress had abstractions that weren't so tightly bound to Java Streams, but we'll likely never find the energy and time to revamp it
   * I understand you want to get feedback on whether something like `TarFile` would be accepted rater than the concrete implementation. IMHO this would be a nice addition even though I don't expect many people to require random access to a raw tar archive. Most people likely deal with tar archives that have been compressed and so you'd need to decompress it to a temporary file (or memory) for random access.
   * we already have a bunch of things copied from commons-io and our very own BoundedInputStream may even predate the one of commons-io. I wouldn't want to add a new dependency to 1.x unless the reason was better than avoiding dupkiicating a few lines of code.
   * have you considered making `TarArchiveEntry` implement `EntryStreamOffsets `?
   * I'd be in favour of moving stream implementations to the utils package, in particular if you copy code from the zip package
   * nitpicking: the methods you've moved to `TarUtils` probably don't need to be public.


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[GitHub] [commons-compress] theobisproject commented on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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theobisproject commented on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-662962115


   I know you are working on this library in your free time. So I did expect this big change to take some time before it is integrated.
   
   >   IMHO this would be a nice addition even though I don't expect many people to require random access to a raw tar archive. Most people likely deal with tar archives that have been compressed and so you'd need to decompress it to a temporary file (or memory) for random access.
   
   As you pointed out this only brings better speed for some special cases e.g. random access or somthing like the `TarLister` where no content is read and therefore the stream needs to read and discard all data.  
   Specifially for compressed archives it can even take longer depending on the target where the file is decompressed to.
   
   >  have you considered making `TarArchiveEntry` implement `EntryStreamOffsets `?
   
   Seems like I missed this interface. Since this exactly what I wanted to implement I will change the implementation to implement the `EntryStreamOffsets` interface.
   
   > I'd be in favour of moving stream implementations to the utils package, in particular if you copy code from the zip package
   
   The code I moved out of the `ZipFile` class is already located in the utils package. Only the Tar specific streams I didn't create in the utils package because in my opinion nobody outside the library should access them and currently no other archive needs similar streams.
   
   > nitpicking: the methods you've moved to `TarUtils` probably don't need to be public.
   
   I agree and will change the code which was moved to the `TarUtils` to be not public.


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[GitHub] [commons-compress] coveralls edited a comment on pull request #113: COMPRESS-540: Implement TarFile to allow random access to tar files

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coveralls edited a comment on pull request #113:
URL: https://github.com/apache/commons-compress/pull/113#issuecomment-654645643


   
   [![Coverage Status](https://coveralls.io/builds/32297922/badge)](https://coveralls.io/builds/32297922)
   
   Coverage increased (+0.007%) to 87.295% when pulling **1e6b0bd66b2c95196614bc14fe3cef1478c458b8 on theobisproject:random-access-tar** into **f41756f8024930384a60c5c57eb9eb2913ce1ae0 on apache:master**.
   


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