/**
* Create an archive input stream from an input stream, autodetecting
* the archive type from the first few bytes of the stream. The InputStream
* must support marks, like BufferedInputStream.
*
* @param in the input stream
* @return the archive input stream
* @throws ArchiveException if the archiver name is not known
* @throws IllegalArgumentException if the stream is null or does not support mark
*/
public ArchiveInputStream createArchiveInputStream(java.io.InputStream inJ)
//throws ArchiveException
{
if (inJ == null)
{
throw new java.lang.IllegalArgumentException("Stream must not be null.");
}
if (!inJ.markSupported())
{
throw new java.lang.IllegalArgumentException("Mark is not supported.");
}
byte[] signature = new byte[12];
inJ.mark(signature.Length);
try {
int signatureLength = inJ.read(signature);
inJ.reset();
if (ZipArchiveInputStream.matches(signature, signatureLength))
{
return(new ZipArchiveInputStream(inJ));
}
else if (JarArchiveInputStream.matches(signature, signatureLength))
{
return(new JarArchiveInputStream(inJ));
}
else if (ArArchiveInputStream.matches(signature, signatureLength))
{
return(new ArArchiveInputStream(inJ));
}
else if (CpioArchiveInputStream.matches(signature, signatureLength))
{
return(new CpioArchiveInputStream(inJ));
}
// Tar needs a bigger buffer to check the signature; read the first block
byte[] tarheader = new byte[512];
inJ.mark(tarheader.Length);
signatureLength = inJ.read(tarheader);
inJ.reset();
if (TarArchiveInputStream.matches(tarheader, signatureLength))
{
return(new TarArchiveInputStream(inJ));
}
} catch (java.io.IOException e) {
throw new ArchiveException("Could not use reset and mark operations.", e);
}
throw new ArchiveException("No Archiver found for the stream signature");
}
/**
* Checks if the signature matches what is expected for a jar file
* (in this case it is the same as for a zip file).
*
* @param signature
* the bytes to check
* @param length
* the number of bytes to check
* @return true, if this stream is a jar archive stream, false otherwise
*/
public new static bool matches(byte[] signature, int length)
{
return(ZipArchiveInputStream.matches(signature, length));
}
