src/main.zig


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const std = @import("std");
const adler32 = std.hash.Adler32;
const openFlags = std.fs.File.OpenFlags{
    .read = true,
    .write = false,
    .lock = std.fs.File.Lock.None,
};

fn dump(args: [][]u8) u8 {
    if (args.len < 3) {
        std.debug.warn("Usage: {} [subcommand] [options]\n", .{args[0]});
        return 255;
    }

    var file = std.fs.openFileAbsolute(args[2], openFlags) catch {
        std.debug.warn("Cannot open file {}\n", .{args[2]});
        return 255;
    };
    defer file.close();

    var buffer: [16]u8 = undefined;
    var r: u64 = undefined;
    while (true) {
        r = file.read(&buffer) catch {
            break;
        };
        if (r <= 0)
            break;

        for (buffer[0..r]) |c| {
            std.debug.warn("0x{x:2} ", .{c});
        }
        std.debug.warn(" -- {}\n", .{r});
    }

    return 0;
}

fn help(args: [][]u8) u8 {
    std.debug.warn("Usage: {} [subcommand] [options]\n", .{args[0]});
    return if (args.len < 2) 255 else 0;
}

pub fn main() anyerror!u8 {
    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
    defer arena.deinit();

    std.debug.warn("All your codebase are belong to us.\n\n", .{});

    const args = try std.process.argsAlloc(&arena.allocator);
    if (args.len < 2) {
        return help(args);
    }

    return switch (adler32.hash(args[1])) {
        adler32.hash("dump") => dump(args),
        else => help(args),
    };
}