Use struct for bytecode header instead of pointer arithmetic

2 files changed, 36 insertions, 0 deletions

diff --git a/include/bytecode/bytecode.h b/include/bytecode/bytecode.h
index a93fe4f..83d62b9 100644
--- a/include/bytecode/bytecode.h
+++ b/include/bytecode/bytecode.h
@@ -83,6 +83,17 @@ typedef u8 AmalOpcodeType;
 /* TODO: Make sure this pragma pack works on all platforms */
 #pragma pack(push, 1)
 typedef struct {
+    u32 magic_number; /* AMAL_BYTECODE_MAGIC_NUMBER */
+    u8 major_version;
+    u8 minor_version;
+    u8 patch_version;
+    u8 endian; /* 0 = little endian, 1 = big endian */
+} BytecodeHeader;
+#pragma pack(pop)
+
+/* TODO: Make sure this pragma pack works on all platforms */
+#pragma pack(push, 1)
+typedef struct {
     u32 func_offset;
     u8 num_params;
     u32 params_num_pointers;
diff --git a/include/std/misc.h b/include/std/misc.h
index a9bd5b6..03d7972 100644
--- a/include/std/misc.h
+++ b/include/std/misc.h
@@ -1,6 +1,31 @@
 #ifndef AMALGAM_MISC_H
 #define AMALGAM_MISC_H
 
+#include "types.h"
+#include <sys/types.h>
+
+#if defined(__BYTE_ORDER)
+    #if __BYTE_ORDER == __LITTLE_ENDIAN
+        #define AMAL_LITTLE_ENDIAN
+    #elif __BYTE_ORDER == __BIG_ENDIAN
+        #define AMAL_BIG_ENDIAN
+    #endif
+#elif defined(__BYTE_ORDER__)
+    #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+        #define AMAL_LITTLE_ENDIAN
+    #elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+        #define AMAL_BIG_ENDIAN
+    #endif
+#endif
+
+#if !defined(AMAL_LITTLE_ENDIAN) && !defined(AMAL_BIG_ENDIAN)
+#error Unsupported endian, neither little or big endian
+#endif
+
+u16 byteswap16(u16 value);
+u32 byteswap32(u32 value);
+u64 byteswap64(u64 value);
+
 #ifndef AMAL_PEDANTIC
 #include "log.h"
 #endif