Initial commit

2 files changed, 83 insertions, 0 deletions

diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..5badf19
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,24 @@
+const Builder = @import("std").build.Builder;
+
+pub fn build(b: *Builder) void {
+    // Standard target options allows the person running `zig build` to choose
+    // what target to build for. Here we do not override the defaults, which
+    // means any target is allowed, and the default is native. Other options
+    // for restricting supported target set are available.
+    const target = b.standardTargetOptions(.{});
+
+    // Standard release options allow the person running `zig build` to select
+    // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall.
+    const mode = b.standardReleaseOptions();
+
+    const exe = b.addExecutable("zig", "src/main.zig");
+    exe.setTarget(target);
+    exe.setBuildMode(mode);
+    exe.install();
+
+    const run_cmd = exe.run();
+    run_cmd.step.dependOn(b.getInstallStep());
+
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..1b8f702
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,59 @@
+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),
+    };
+}