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https://issues.apache.org/jira/browse/COMPRESS-538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136390#comment-17136390
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Peter Lee commented on COMPRESS-538:
------------------------------------
Commons Compress will add zip64 extra field in the following cases:
1, The Zip64Mode is Zip64Mode.Always : you can modify this by entry.setUnixMode;
2, The uncompressed size or compressed size of the entry is large so we need to
use zip64;
3, The uncompressed size of the entry is unknown and the Zip64Mode is NOT
Zip64Mode.Never : we do not know the entry's uncompressed size, so we add a
zip64 extra here in case of it's too large.
In your particular testcase, you're experiencing the third case I have listed.
You can simply avoid this by specifying the size of the file :
{code:java}
@Test
public void testExtra() throws IOException {
// Create file
final File file = File.createTempFile("apache_", ".zip");
try ( ZipArchiveOutputStream zos = new ZipArchiveOutputStream(file)) {
ZipArchiveEntry entry = new ZipArchiveEntry("TextFile1.txt");
entry.setSize(0);
zos.putArchiveEntry(entry);
zos.closeArchiveEntry();
}
// List Headers File
final ZipFile zipFile = new ZipFile(file);
final Enumeration<? extends ZipArchiveEntry> entries = zipFile.getEntries();
while (entries.hasMoreElements()) {
final ZipArchiveEntry entry = entries.nextElement();
for (ZipExtraField zipExtraField : entry.getExtraFields()) {
System.out.println("EntryName:" + entry.getName() + " Header: "+
zipExtraField.getHeaderId().getValue()); // Header shouldn't be present.
}
}
}
{code}
BTW : the affected version you set is 1.8 but the latest release of Commons
Compress is 1.20. I'm only testing this in 1.20.
> ZipEntry created using ZipArchiveOutputStream(File) constructor adds 'ZIP64
> Extended Information Extra Field' even when zip64 is not required.
> ----------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: COMPRESS-538
> URL: https://issues.apache.org/jira/browse/COMPRESS-538
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers
> Affects Versions: 1.8
> Reporter: Pritesh
> Priority: Major
>
> When creating a zip file using
> [ZipArchiveOutputStream(File)|https://commons.apache.org/proper/commons-compress/apidocs/org/apache/commons/compress/archivers/zip/ZipArchiveOutputStream.html#ZipArchiveOutputStream-java.io.File-]
> constructor each entry get an extra `Zip64ExtendedInformationExtraField`
> header which shouldn't be there.
>
> The issue can be reproduced using below code sample
> {code:java}
> public static void main(String[] args) throws IOException {
> // Create file
> final File file = File.createTempFile("apache_", ".zip");
> try ( ZipArchiveOutputStream zos = new ZipArchiveOutputStream(file)) {
> zos.putArchiveEntry(new ZipArchiveEntry("TextFile1.txt"));
> zos.closeArchiveEntry();
> }
> // List Headers File
> final ZipFile zipFile = new ZipFile(file);
> final Enumeration<? extends ZipArchiveEntry> entries =
> zipFile.getEntries();
> while (entries.hasMoreElements()) {
> final ZipArchiveEntry entry = entries.nextElement();
> for (ZipExtraField zipExtraField : entry.getExtraFields()) {
> System.out.println("EntryName:" + entry.getName() + " Header:
> "+ zipExtraField.getHeaderId().getValue()); // Header shouldn't be present.
> }
> }
> }
> {code}
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