From 4a28c8943e564e1d4c0a16300deb95259a029796 Mon Sep 17 00:00:00 2001
From: IonutParau <ionut.alex.parau@gmail.com>
Date: Tue, 8 Jul 2025 21:18:28 +0200
Subject: [PATCH] basic hashing

---
 build.zig               | 20 +++++++++++++++++---
 src/components/eeprom.c |  9 +++------
 2 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/build.zig b/build.zig
index 5beff09..9a94825 100644
--- a/build.zig
+++ b/build.zig
@@ -1,7 +1,19 @@
 const std = @import("std");
 const builtin = @import("builtin");
 
-fn addEngineSources(c: *std.Build.Step.Compile) void {
+fn addEngineSources(b: *std.Build, c: *std.Build.Step.Compile, target: std.Build.ResolvedTarget, optimize: std.builtin.OptimizeMode) void {
+    const dataMod = b.createModule(.{
+        .root_source_file = b.path("src/data.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    const zigObj = b.addObject(.{
+        .name = "zig_wrappers",
+        .root_module = dataMod,
+        .pic = true,
+    });
+    c.addObject(zigObj);
+    
     c.linkLibC(); // we need a libc
 
     c.addCSourceFiles(.{
@@ -23,6 +35,8 @@ fn addEngineSources(c: *std.Build.Step.Compile) void {
             "src/components/keyboard.c",
         },
     });
+
+    c.addIncludePath(b.path("src"));
 }
 
 const LuaVersion = enum {
@@ -87,7 +101,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    addEngineSources(engineStatic);
+    addEngineSources(b, engineStatic, target, optimize);
 
     const engineShared = b.addSharedLibrary(.{
         .name = getSharedEngineName(os),
@@ -95,7 +109,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    addEngineSources(engineShared);
+    addEngineSources(b, engineShared, target, optimize);
 
     const engineStep = b.step("engine", "Builds the engine as a static library");
     engineStep.dependOn(&engineStatic.step);
diff --git a/src/components/eeprom.c b/src/components/eeprom.c
index f77644d..8f2abaa 100644
--- a/src/components/eeprom.c
+++ b/src/components/eeprom.c
@@ -153,7 +153,6 @@ void nn_eeprom_makeReadonly(nn_eeprom *eeprom, void *_, nn_component *component,
     eeprom->makeReadonly(component, eeprom->userdata);
 }
 
-// TODO: make good
 void nn_eeprom_getChecksum(nn_eeprom *eeprom, void *_, nn_component *component, nn_computer *computer) {
     size_t cap = eeprom->getDataSize(component, eeprom->userdata);
     nn_Alloc *alloc = nn_getAllocator(nn_getUniverse(computer));
@@ -166,13 +165,11 @@ void nn_eeprom_getChecksum(nn_eeprom *eeprom, void *_, nn_component *component,
     if(len < 0) {
         return;
     }
-    size_t sum = 0;
-    for(size_t i = 0; i < len; i++) {
-        sum += buf[i];
-    }
+    char hash[4] = {1, 0, 0, 1};
+    nn_data_crc32(buf, len, hash);
     nn_dealloc(alloc, buf, cap);
 
-    nn_return_string(computer, (void *)&sum, sizeof(sum));
+    nn_return_string(computer, hash, sizeof(hash));
     
     nn_eeprom_readCost(component, len);
 }