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Asked: 2026-05-15T23:37:14+00:00

I am writing a custom archive format in JAVA (J2ME to be precise). The

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I am writing a custom archive format in JAVA (J2ME to be precise). The archiver works OK, however I have little problems with de-archiving.

How could I know how many bytes have been read when reading a UTF8 string thorough the readUTF method? I know that the first two bytes of a string saved using writeUTF are a short value of the string’s length, but I’d like a nicer solution.

Or is there any way to know how many bytes are left till the end of the DataInputStream (the available method doesn’t seem to return meaningful values). The stream was opened by a FileConnection, i.e. FileConnection.openDataInputStream.

Thanks guys!

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  1. Editorial Team

    I can’t see a way of achieving this using the CLDC API directly. A simple solution however, would be to roll your own “CountingInputStream” that extends InputStream and counts the number of bytes read. You would basically just need to override the three read-methods.

    The file size is available through the FileConnection.

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