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https://issues.apache.org/jira/browse/COMPRESS-540?focusedWorklogId=530740&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-530740
]
ASF GitHub Bot logged work on COMPRESS-540:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 04/Jan/21 15:59
Start Date: 04/Jan/21 15:59
Worklog Time Spent: 10m
Work Description: theobisproject commented on a change in pull request
#113:
URL: https://github.com/apache/commons-compress/pull/113#discussion_r551402409
##########
File path:
src/main/java/org/apache/commons/compress/archivers/tar/TarArchiveEntry.java
##########
@@ -553,6 +554,23 @@ public TarArchiveEntry(final byte[] headerBuf, final
ZipEncoding encoding, final
parseTarHeader(headerBuf, encoding, false, lenient);
}
+ /**
+ * Construct an entry from an archive's header bytes for random access
tar. File is set to null.
+ * @param headerBuf the header bytes from a tar archive entry.
+ * @param encoding encoding to use for file names.
+ * @param lenient when set to true illegal values for group/userid, mode,
device numbers and timestamp will be
+ * ignored and the fields set to {@link #UNKNOWN}. When set to false such
illegal fields cause an exception instead.
+ * @param dataOffset position of the entry data in the random access file.
+ * @since 1.21
+ * @throws IllegalArgumentException if any of the numeric fields have an
invalid format.
+ * @throws IOException on error.
+ */
+ public TarArchiveEntry(final byte[] headerBuf, final ZipEncoding encoding,
final boolean lenient,
+ final long dataOffset) throws IOException {
+ this(headerBuf, encoding, lenient);
+ this.dataOffset = dataOffset;
+ }
Review comment:
It now throws an IAE if the offset is negative. Detecting if the offset
is larger than the complete file is not possible here. I tested setting the
offset of an entry to the end of the file. When reading the inputstream there
is immediately an IOException thrown.
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Issue Time Tracking
-------------------
Worklog Id: (was: 530740)
Time Spent: 9h 10m (was: 9h)
> Random access on Tar archive
> ----------------------------
>
> Key: COMPRESS-540
> URL: https://issues.apache.org/jira/browse/COMPRESS-540
> Project: Commons Compress
> Issue Type: Improvement
> Reporter: Robin Schimpf
> Priority: Major
> Time Spent: 9h 10m
> Remaining Estimate: 0h
>
> The TarArchiveInputStream only provides sequential access. If only a small
> amount of files from the archive is needed large amount of data in the input
> stream needs to be skipped.
> Therefore I was working on a implementation to provide random access to
> TarFiles equal to the ZipFile api. The basic idea behind the implementation
> is the following
> * Random access is backed by a SeekableByteChannel
> * Read all headers of the tar file and save the place to the data of every
> header
> * User can request an input stream for any entry in the archive multiple
> times
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