From e1591e9810c3696879c2bd39b7a8af700ff3b13d Mon Sep 17 00:00:00 2001
From: SpookyDervish <nchand05@outlook.com>
Date: Thu, 16 Jul 2026 12:04:17 +1000
Subject: [PATCH] add file loading

---
 meson.build |  8 ++------
 src/emu.c   |  4 +++-
 src/main.c  | 17 +++++++++--------
 src/util.c  | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/util.h  | 20 ++++++++++++++++++++
 5 files changed, 79 insertions(+), 15 deletions(-)
 create mode 100644 src/util.c
 create mode 100644 src/util.h

diff --git a/meson.build b/meson.build
index 91b511b..c5cfb5d 100644
--- a/meson.build
+++ b/meson.build
@@ -4,14 +4,10 @@ sources = [
     'src/main.c',
     'src/emu.c',
     'src/memory.c',
-    'src/instruction.c'
+    'src/instruction.c',
+    'src/util.c'
 ]
 
 args = ['-Wall', '-Wextra', '-O3']
-if get_option('buildtype') == 'debug'
-    args = ['-Wall', '-Wextra', '-O3', '-ggdb', '-fsanitize=address']
-    add_project_arguments('-fsanitize=address', language : 'c')
-    add_project_link_arguments('-fsanitize=address', language : 'c')
-endif
 
 executable('emu', sources, c_args: args)
\ No newline at end of file
diff --git a/src/emu.c b/src/emu.c
index 64ca695..8560b59 100644
--- a/src/emu.c
+++ b/src/emu.c
@@ -1,7 +1,9 @@
 #include "emu.h"
 
 inline Instruction fetchInst(Emulator* emu) {
-    return decodeInstruction(emu->mem, &emu->pc);
+    Instruction inst = decodeInstruction(emu->mem, &emu->pc);
+    printf("%s\n", instructionToCStr(inst));
+    return inst;
 }
 
 inline void updateFlagsRegister(Emulator* emu, int32_t value) {
diff --git a/src/main.c b/src/main.c
index 7c0379a..61c27b1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include "emu.h"
+#include "util.h"
 
 int main() {
     Emulator* emu = initEmulator(0x00010FFF);
@@ -8,19 +9,19 @@ int main() {
         return 1;
     }
 
-    Instruction program[] = {
+    RomFile* romFile = readProgramFromFile("../test.bin");
+
+    /*Instruction program[] = {
         {INST_MVI, {REG_A, 0, 0}, 5, true},
         {INST_MVI, {REG_B, 0, 0}, 3, true},
         {INST_ADD, {REG_A, REG_B, 0}, 0, false},
         {INST_HLT, {}, 0, false}
-    };
-    memoryLoadProgram(emu->mem, program, sizeof(program)/sizeof(program[0]));
-
-    printf("%s\n", instructionToCStr(decodeInstruction(emu->mem, &emu->pc)));
-    printf("%s\n", instructionToCStr(decodeInstruction(emu->mem, &emu->pc)));
-    printf("%s\n", instructionToCStr(decodeInstruction(emu->mem, &emu->pc)));
-    printf("%s\n", instructionToCStr(decodeInstruction(emu->mem, &emu->pc)));
+    };*/
+    printf("%d\n", romFile->header.numInstructions);
+    memoryLoadProgram(emu->mem, romFile->instructions, romFile->header.numInstructions);
+    
 
+    //startEmulator(emu);
     freeEmulator(emu);
 
     return 0;
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..1243288
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,45 @@
+#include "util.h"
+
+RomFile* readProgramFromFile(char* path) {
+    FILE* f = fopen(path, "rb");
+    if (!f) {
+        perror("failed to open file");
+        return NULL;
+    }
+
+    fseek(f, 0, SEEK_END);
+    long length = ftell(f);
+    rewind(f);
+
+    char* buffer = malloc(length);
+    if (!buffer) {
+        fclose(f);
+        return NULL;
+    }
+
+    fread(buffer, length, 1, f);
+    fclose(f);
+
+    ROMFileHeader* header = (ROMFileHeader*)buffer;
+    Instruction* instructions = calloc(header->numInstructions, sizeof(SerializedInst));
+    if (!instructions) {
+        free(buffer);
+        return NULL;
+    }
+
+    RomFile* romFile = malloc(sizeof(RomFile));
+    if (!romFile) {
+        free(buffer);
+        free(instructions);
+        return NULL;
+    }
+
+    romFile->header = *header;
+    romFile->instructions = instructions;
+
+    char* cursor = buffer + sizeof(ROMFileHeader);
+
+    memcpy(instructions, cursor, sizeof(SerializedInst) * header->numInstructions);
+
+    return romFile;
+}
\ No newline at end of file
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..76c4d32
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "instruction.h"
+#include <stdio.h>
+#include <string.h>
+
+// -- TYPES -- //
+typedef struct {
+    char magic[4];
+    uint8_t version;
+    uint32_t numInstructions;
+} ROMFileHeader;
+
+typedef struct {
+    ROMFileHeader header;
+    Instruction* instructions;
+} RomFile;
+
+// -- FUNCTIONS -- //
+RomFile* readProgramFromFile(char* path);
\ No newline at end of file