Dump a BMP file 2 an array of arrays (of arrays)

Hi,

I've been trying to dump a bmp file in to an array as follows:
an array of 32 arrays of 32 arrays of 4 byte values, but have not been able to make it work, I would appreciate any help, this is what I've been trying:

The first 54 bytes have header information:

var img = new Array();
function rcolor(x){
    return (TONES*x/256);
}

function readbmp(myfile){
    try{
        var i=0;
        var k=0;
        var x=0;
        var flag=0;
        var px = new Array();
        px[0] = 0;
        px[1] = 0;
        px[2] = 0;
        px[3] = 0;
        var line=new Array();
        if (myfile.length==4096){
            flag=4;
        }
        else {
            flag =3;
        }
        for (var byte in myfile){
            z= myfile[byte];
            console.log(z);
            k+=1;
            if(k==1){
                px[0]=myfile[byte];
            }
            if(k==2){
                px[1]=myfile[byte];
            }
            if(k==3){
                px[2]=myfile[byte];
            }
            if(k==4){
                px[3]=myfile[byte];
            }
            if(k==flag){
                k=0;
                line.push(px);
                x+=1;
                if(x==32){
                    img.push(line);
                    line.splice(0, line.length); 
                    x=0;
                }
  
            }
        }
        console.log(img);
        return x;
    }
    catch(err){
        return 0;
    }
}

var image = require("fs").readFile("GIF/wizardcity00001.bmp", "binary");
image = image.substr(54,image.length);
readbmp(image);

I would really appreciate any help.

Bests