From 1ec1deedee97c03aec0a0e306e9dcda19afdfd81 Mon Sep 17 00:00:00 2001
From: Nikita Smith <git.nikita.smith@gmail.com>
Date: Sat, 22 Mar 2025 20:37:39 -0700
Subject: [PATCH] moved MSF magic checkers to msf.c

---
 src/msf/msf.c       | 12 ++++++++++++
 src/msf/msf.h       |  5 +++++
 src/msf/msf_parse.c |  6 ++----
 3 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/src/msf/msf.c b/src/msf/msf.c
index f78cec82..116918c8 100644
--- a/src/msf/msf.c
+++ b/src/msf/msf.c
@@ -1,4 +1,16 @@
 // Copyright (c) 2024 Epic Games Tools
 // Licensed under the MIT license (https://opensource.org/license/mit/)
 
+internal B32
+msf_check_magic_20(String8 data)
+{
+  B32 is_msf = data.size >= sizeof(msf_msf20_magic) && str8_match(data, str8_lit(msf_msf20_magic), StringMatchFlag_RightSideSloppy);
+  return is_msf;
+}
 
+internal B32
+msf_check_magic_70(String8 data)
+{
+  B32 is_msf = data.size >= sizeof(msf_msf70_magic) && str8_match(data, str8_lit(msf_msf70_magic), StringMatchFlag_RightSideSloppy);
+  return is_msf;
+}
diff --git a/src/msf/msf.h b/src/msf/msf.h
index f18d8204..34bc9960 100644
--- a/src/msf/msf.h
+++ b/src/msf/msf.h
@@ -52,4 +52,9 @@ struct MSF_Header70
   MSF_PageNumber root_pn;
 };
 
+////////////////////////////////
+
+internal B32 msf_check_magic_20(String8 data);
+internal B32 msf_check_magic_70(String8 data);
+
 #endif // MSF_H
diff --git a/src/msf/msf_parse.c b/src/msf/msf_parse.c
index 79d00fd1..941f5d40 100644
--- a/src/msf/msf_parse.c
+++ b/src/msf/msf_parse.c
@@ -13,11 +13,9 @@ msf_raw_stream_table_from_data(Arena *arena, String8 msf_data)
   
   //- determine msf type
   U32 index_size = 0;
-  if (msf_data.size >= sizeof(msf_msf20_magic) &&
-      str8_match(msf_data, str8_lit(msf_msf20_magic), StringMatchFlag_RightSideSloppy)) {
+  if (msf_check_magic_20(msf_data)) {
     index_size = 2;
-  } else if (msf_data.size >= sizeof(msf_msf70_magic) && 
-             str8_match(msf_data, str8_lit(msf_msf70_magic), StringMatchFlag_RightSideSloppy)) {
+  } else if (msf_check_magic_70(msf_data)) {
     index_size = 4;
   }