[your code here] HexViewer

[Steven Schveighoffer via Digitalmars-d]

On 8/2/17 3:39 PM, Andre Pany wrote:
> This application opens the file passed as argument and display the 
> content in hex and text format:
> 
> 00 00 03 00 00 00 64 00 00 00 FF 56 01 00 00 70 ......d... V
..p
> 02 00 FF A6 00 00 00 20 02 00 00 00 00 00 00 00    . ª... .......
> 00 00 00 00 00 00 00 00 00 00 00 00                ............
> 
> void main(string[] args)
> {
>      import std.file, std.string, std.range, std.array, std.algorithm, 
> std.digest, std.conv;
>      import std.stdio: writeln;
> 
>      enum cols = 16;
>      auto data = cast(const(ubyte)[]) read(args[1]);
> 
>      foreach(g; data.chunks(cols))
>      {
>          string hex = g.toHexString.chunks(2).join(" ").to!string;
>          string txt = g.map!(b => b == 0 ? '.' : char(b)).array;
>          writeln(hex.leftJustify(cols * 2 + (cols - 1), ' '), "    ", txt);
>      }
> }

Very nice!

I think actually you are going to have a bit of trouble with the 'text' 
output, since D is going to output the character array as unicode, vs. a 
normal hexdump which will output as one glyph per byte. You could do 
this poorly by changing the map condition to b == 0 || b >= 0x80.

Actually you may want to substitute some extra chars, as I'm not sure 
low bytes are printable (or will print what you really want them to).

-Steve