CODEWITHSUNDEEP
javabzip2compression
Akshitha
Akshitha

Reputation: 89

BZip2 - What to be passed to FileOutputstream for different types of files

I am trying to extract a bz2 file as mentioned below, this is a test class that I wrote and I know that it is .txt file when uncompressed, but when I actually read it from the server, the uncompressed bz2 file can be anything like html, tar,tgz or text files, how would I be able to make this code generic such that it will work for any kind of file.

I want to uncompress different files, if it is test.txt.bz2, then uncompress to test.txt and 6223.webvis.html_20130803195241.bz2 to 6223.webvis.html_20130803195241. How can I make my code generic such that it will work for these two different scenarios.

try{
FileInputStream fin = new FileInputStream("C:\\temp\\test.txt.bz2");
BufferedInputStream in = new BufferedInputStream(fin);
FileOutputStream out = new FileOutputStream("C:\\temp\\test.txt");
BZip2CompressorInputStream bzIn = new BZip2CompressorInputStream(in);
int buffersize = 1024;
final byte[] buffer = new byte[buffersize];
int n = 0;
while (-1 != (n = bzIn.read(buffer))) {
out.write(buffer, 0, n);
}
out.close();
bzIn.close();
}
catch (Exception e) {
throw new Error(e.getMessage());
}
}

Thanks, Akshitha.

Upvotes: 0

Views: 620

Answers (2)

Gabriel Negut
Gabriel Negut

Reputation: 13960

A BZ2 archive does not know anything about the original name. The usual way to do it is to compress file.ext as file.ext.bz2, so you get the output file name from the archive name.

String inFile = "test.bz2";
String outFile = inFile.substring(0, inFile.length() - 4);
// outFile == "test"

Upvotes: 1

Joshua
Joshua

Reputation: 43259

The normal pattern is a file with name x gets saved as x.bz2, so the output file name is the input file name with the last four characters removed. The only known exception is x.tar -> x.tbz (but some people use x.tar.bz2).

This means your example doesn't follow the normal pattern; otherwise it would be test.txt.bz2.

Upvotes: 1

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