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https://issues.apache.org/jira/browse/COMPRESS-254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13870485#comment-13870485
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Stefan Bodewig commented on COMPRESS-254:
-----------------------------------------
When not using Zip64 you are limited to 65535 entries or you create invalid ZIP
archives. See section 4.3.16 in
http://www.pkware.com/documents/casestudies/APPNOTE.TXT where there are only
two bytes for "total number of entries in the central directory". So when we
introduced Zip64 support we plugged a hole that allowed Compress to create
invalid archives.
> ZipArchiveOutputStream try to switch to Zip64 when entries count over 64K
> entries
> ---------------------------------------------------------------------------------
>
> Key: COMPRESS-254
> URL: https://issues.apache.org/jira/browse/COMPRESS-254
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers
> Affects Versions: 1.3, 1.4, 1.5, 1.6
> Environment: Unzip version < 6.0 (without Zip64 support)
> Reporter: Taras Ledkov
>
> Since version 1.3 we cannot create zip archive that contains over then 64K
> entries & without Zip64 extension.
> In case Zip64Mode.AsNeed is used target zip file cannot be open by unzip
> older then version 6.0.
> In case Zip64Mode.Never is used exception is thrown.
> Why so strong restriction as (ZipConstants,ZIP64_MAGIC_SHORT = 0xFFFF) was
> happened?
> To reproduce you can use dummy test below & [old unzip
> binaries|ftp://ftp.info-zip.org/pub/infozip/unix/]:
> {code:title=TestHuge}
> import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
> import org.apache.commons.compress.archivers.zip.ZipArchiveOutputStream;
> import java.io.File;
> import java.io.FileOutputStream;
> import java.io.IOException;
> import java.io.OutputStream;
> public class TestHuge {
> public static void main(String[] args) throws IOException {
> try(OutputStream os = new FileOutputStream(new File("test.zip"));
> ZipArchiveOutputStream zos = new ZipArchiveOutputStream(os)) {
> zos.setLevel(0);
> for (int dirCount = 0; dirCount < 10; ++dirCount) {
> ZipArchiveEntry entryDir = new ZipArchiveEntry("dir" +
> dirCount + "/");
> zos.putArchiveEntry(entryDir);
> zos.closeArchiveEntry();
> for (int i = 0; i < 0x4000; ++i) {
> ZipArchiveEntry entryFile = new ZipArchiveEntry("dir" +
> dirCount + "/" + "file" + i);
> zos.putArchiveEntry(entryFile);
> zos.write(("" + dirCount + " " + i).getBytes());
> zos.closeArchiveEntry();
> }
> }
> zos.finish();
> }
> }
> }
> {code}
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