Alternative ways to iterate through bytes while parsing

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Here is another option I found that seems a bit more safe.

const std = @import("std");
const print = std.debug.print;

const Header = struct { id: u8, len: u8 };

fn readBytes(data: []const u8, offset: *usize) ?[]const u8 {
    if (offset.* >= data.len) return null;
    const header = @ptrCast(*const Header, data[offset.* .. offset.* + 2]);
    offset.* += @sizeOf(Header);
    const bytes = data[offset.* .. offset.* + header.len];
    offset.* += header.len;
    return bytes;
}

pub fn main() !void {
    const data = "\x00\x05\x48\x65\x6c\x6c\x6f\x01\x03\x61\x6c\x6c";

    var offset: usize = 0;
    while (readBytes(data, &offset)) |bytes| {
        print("{s}\n", .{bytes});
    }
}

I am interested to see other options though!

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