🚀 go-pugleaf

Angus:

I just wrote a helper method to do the conversion for me.  If you read
your data into byte[] it's a little easier.  Here's my converter
methods to go int from 2 bytes, to int from one byte (not really
needed but it keeps the calling code cleaner) and 4 bytes to long:

  // convert two bytes into an int, least significant bit first
  static final int toInt(byte[] bStreamIn){
     if(bStreamIn.length != 2)
        throw new IllegalArgumentException("int assumes 2 bytes");
     int part1 = (int)bStreamIn[0];
     int part2 = (int)bStreamIn[1];

     if( part1 < 0 )
        part1 += 256;

     return( part1 + (part2 << 8) );

  } // end of method toInt(byte[])

  // convert one byte to an int
  static final int charToInt(byte[] bIn){
     return (int)bIn[0];
  } // end of method  charToInt(byte[])

  // convert 4 bytes into a long, least significant bit first
  static final long toLong(byte[] bStreamIn){
     if(bStreamIn.length != 4)
        throw new IllegalArgumentException("long assumes 4 bytes");

        int part1 = (int)bStreamIn[0];
        int part2 = (int)bStreamIn[1];
        int part3 = (int)bStreamIn[2];
        int part4 = (int)bStreamIn[3];

        if(part1 < 0) part1 += 256;
        if(part2 < 0) part2 += 256;
        if(part3 < 0) part3 += 256;

        return( part1 + (part2 << 8) + (part3 << 16) + (part4 << 24)
);

  } // end of method toLong(byte[])


Hope this helps.

-Rich

angus m. fraser wrote:
> 
> In article <35781FFA.4E08492E@corp.borland.com>, rwilkman@corp.borland.com
> (Rich Wilkman) wrote:
> 
> > Angus:
> >
> > You're probably getting a "big indian, little indian" issue here.
> > When I was reading ints from a binary file I had to remember to
> > bitshift them because they're different in Java (to get around the
> > lack of a "signed" keyword).
> >
> > -Rich
> >
> 
> Thanks. That's what I thought was happening. It's going to be very tedious
> though having to read 2 bytes at a time and use a DIY method to convert
> them to the 'correct' short type.
> 
> Angus

-- 

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Rich Wilkman
Senior Quality Assurance Engineer
Borland JBuilder Team

If you see something that looks like an opinion up there,
it's mine and mine alone.

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