PeterAlfredLee commented on pull request #356:
URL: https://github.com/apache/tika/pull/356#issuecomment-698067189
I updated a little bit with the DD signature part. This works with Compress
1.20 and works fine with this PR.
```
private InputStream forgeZipInputStream() throws IOException {
// generate a zip archive in memory
try (final ByteArrayOutputStream byteArrayOutputStream = new
ByteArrayOutputStream();
final ZipArchiveOutputStream zo = new
ZipArchiveOutputStream(byteArrayOutputStream);){
final ZipArchiveEntry entryA = new ZipArchiveEntry("foo");
entryA.setMethod(ZipEntry.STORED);
entryA.setSize(4);
entryA.setCrc(0xb63cfbcdl);
zo.putArchiveEntry(entryA);
zo.write(new byte[] { 1, 2, 3, 4 });
zo.closeArchiveEntry();
zo.close();
final byte[] zipContent = byteArrayOutputStream.toByteArray();
final byte[] old = Arrays.copyOf(zipContent, zipContent.length);
final byte[] zipContentWithDataDescriptor = new
byte[zipContent.length + 16];
System.arraycopy(zipContent, 0, zipContentWithDataDescriptor, 0,
37);
// modify the general purpose bit flag
zipContentWithDataDescriptor[6] = (byte) 0x08;
// add the Data Descriptor Signature
zipContentWithDataDescriptor[37] = (byte) 0x50;
zipContentWithDataDescriptor[38] = (byte) 0x4B;
zipContentWithDataDescriptor[39] = (byte) 0x07;
zipContentWithDataDescriptor[40] = (byte) 0x08;
// copy the crc-32, compressed size and uncompressed size to the
data descriptor
System.arraycopy(zipContent, 14, zipContentWithDataDescriptor,
41, 12);
// and copy the rest of the zip content
System.arraycopy(zipContent, 37, zipContentWithDataDescriptor,
53, zipContent.length - 37);
return new ByteArrayInputStream(zipContentWithDataDescriptor);
}
}
```
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