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Are there any Java Frameworks for binary file parsing?

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情话喂你
情话喂你 2020-12-08 05:19

My problem is, that I want to parse binary files of different types with a generic parser which is implemented in JAVA. Maybe describing the file format with a configuration

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  • 夕颜
    2020-12-08 05:48

    Parser combinator library is an option. JParsec works fine, however it could be slow.

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  • 滥情空心
    2020-12-08 05:54

    I have used DataInputStream for reading binary files and I write the rules in Java. ;) Binary files can have just about any format so there is no general rule for how to read them.

    Frameworks don't always make things simpler. In your case, the description file is longer than the code to just read the data using a DataInputStream.

    public static void parse(DataInput in) throws IOException {
//        file:
//          header: FIXED("MAGIC")
    String header = readAsString(in, 5);
    assert header.equals("MAGIC");
//          body: content(10)
// ?? not sure what this means
//        content:
    for(int i=0;i<10;i++) {
//          value1: BYTE
        byte value1 = in.readByte();
//          value2: LONG
        long value2 = in.readLong();
//          value3: STRING(10)
        String value3 = readAsString(in, 10);
    }
}

public static String readAsString(DataInput in, int len) throws IOException {
    byte[] bytes = new byte[len];
    in.readFully(bytes);
    return new String(bytes);
}

    If you want to have a configuration file you could use a Java Configuration File. http://www.google.co.uk/search?q=java+configuration+file

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  • 夕颜
    2020-12-08 05:56

    Using Preon:

    public class File {

  @BoundString(match="MAGIC")
  private String header;

  @BoundList(size="10", type=Body.class)
  private List<Body> body;

  private static class Body {

    @Bound
    byte value1;

    @Bound
    long value2;

    @BoundString(size="10")
    String value3;

  }


}

    Decoding data:

    Codec<File> codec = Codecs.create(File.class);
File file = codecs.decode(codec, buffer);

    Let me know if you are running into problems.

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  • 爱一瞬间的悲伤
    2020-12-08 05:57

    Have you looking into the world of parsers. A good parser is yacc, and there may be a port of it for java.

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  • 萌比男神i
    2020-12-08 05:58

    give a try to preon

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  • 一向
    2020-12-08 05:59

    You can parse binary files with parsers like JavaCC. Here you can find a simple example. Probably it's a bit more difficult than parsing text files.

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