CODEWITHSUNDEEP
java
sparker
sparker

Reputation: 1578

Create tar from the Map and convert it to bytearray without saving

I have a map which has file name as a key in String format and the contents as value in bytearray (byte[]).

I want to compress all the entries inside the map in a single tar file and convert the tar file into bytearray without saving anything to the disk.

As of now I am creating the tar file in temp directory and again reading the tar file as byteArray.

But is there any other way which we can create a tar file in memory and convert it to bytearray ?

I am using appache commons TarArchive Library. this is what I tried so far..

TarArchiveOutputStream outTar = new TarArchiveOutputStream(byteArrayOutputStream);

        for (Map.Entry<String, byte[]> entry : fileMap.entrySet()){

            TarArchiveEntry tarArchiveEntry = new TarArchiveEntry(entry.getKey());
            tarArchiveEntry.setSize(entry.getValue().length);

            try {
                outTar.putArchiveEntry(tarArchiveEntry);
                outTar.write(entry.getValue());

            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        try {
            outTar.close();
            outTar.closeArchiveEntry();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return byteArrayOutputStream.toByteArray();

Upvotes: 0

Views: 1323

Answers (1)

kutschkem
kutschkem

Reputation: 8163

The closeArchiveEntry has to go into the for loop, you have to close each Entry before you begin the next:

for (Map.Entry<String, byte[]> entry : fileMap.entrySet()){

            TarArchiveEntry tarArchiveEntry = new TarArchiveEntry(entry.getKey());
            tarArchiveEntry.setSize(entry.getValue().length);

            try {
                outTar.putArchiveEntry(tarArchiveEntry);
                outTar.write(entry.getValue());
                outTar.closeArchiveEntry();   ////////  <-----------

            } catch (IOException e) {
                e.printStackTrace();
            }

        }

        try {
            outTar.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

Upvotes: 1

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