basic file format

src/common.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <cstdint>
+
+#define ASSERT(cond)                                                           \
+  if (!(cond)) {                                                               \
+    std::cerr << "ASSERTION FAILED at " << __FILE__ << ":" << __LINE__ << "\n" \
+              << #cond << std::endl;                                           \
+    abort();                                                                   \
+  }
+
+using u8 = unsigned char;
+using i8 = char;
+using i32 = int32_t;
+using u32 = uint32_t;
+using i64 = int64_t;
+using u64 = uint64_t;
+static_assert(sizeof(float) * 8 == 32);
+using f32 = float;
+static_assert(sizeof(double) * 8 == 64);
+using f64 = double;