Convert int to unsigned short java

Question

I have written a .obj parser in java to modelize 3D objects on iPhone. I would like to export the data as a binary file, which must be as small as possible. I have plenty of indices that would fit a unsigned short, but they are represented as int in java.

I would like to use the ByteBuffer class to do the conversion just before writing the data in a file. I suppose I will have to manipulate bytes before pushing them into the ByteBuffer but I have no idea how to do so.

Thank you in advance if you can help me.

Solution 1

In Java, an unsigned short can be represented as a char. Just cast the int to char and use putChar() on the ByteBuffer.

myBuffer.putChar((char) my16BitInt);

Solution 2

short toUint16(int i)
{
    return (short) i;
}

int toUint32(short s)
{
    return s & 0xFFFF;
}

Solution 3

You can extract single bytes from your integers with

int i;
byte b1 = i & 0xFF;
byte b2 = (i >> 8) & 0xFF;

Comments

[Vishy]

+1: This does the same as myBuffer.putShort((short) my16BitInt);

[Winter]

return s & 0xFFFF;