From 316ff3847b4d9d87d9b0aab15321461db0e8ae0b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Sat, 8 Jun 2019 17:43:23 -0700
Subject: [PATCH] Fixed bug 4526 - replace SDL_RW* macros with functions for
 using in bindings

ace

I got this bug in SDL_ttf:
https://bugzilla.libsdl.org/show_bug.cgi?id=4524
Sylvain proposed solution:
SDL_RWseek(RWops, 0, RW_SEEK_SET);

And it works, but i can use it my project, because it written in C# with SDL2-CS wrapper and there not export for macroses:
#define SDL_RWsize(ctx)         (ctx)->size(ctx)
#define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
#define SDL_RWtell(ctx)         (ctx)->seek(ctx, 0, RW_SEEK_CUR)
#define SDL_RWread(ctx, ptr, size, n)   (ctx)->read(ctx, ptr, size, n)
#define SDL_RWwrite(ctx, ptr, size, n)  (ctx)->write(ctx, ptr, size, n)
#define SDL_RWclose(ctx)        (ctx)->close(ctx)

Therefore, I suggest replacing this macros with functions so that they can be exported and used in bindings
---
 include/SDL_rwops.h               | 61 +++++++++++++++++++++++++------
 src/dynapi/SDL_dynapi_overrides.h |  7 ++++
 src/dynapi/SDL_dynapi_procs.h     |  7 ++++
 src/file/SDL_rwops.c              | 42 +++++++++++++++++++++
 4 files changed, 105 insertions(+), 12 deletions(-)

diff --git a/include/SDL_rwops.h b/include/SDL_rwops.h
index d26fff9bce4cb..f66119fb02249 100644
--- a/include/SDL_rwops.h
+++ b/include/SDL_rwops.h
@@ -176,19 +176,48 @@ extern DECLSPEC void SDLCALL SDL_FreeRW(SDL_RWops * area);
 #define RW_SEEK_END 2       /**< Seek relative to the end of data */
 
 /**
- *  \name Read/write macros
+ *  Return the size of the file in this rwops, or -1 if unknown
+ */
+extern DECLSPEC Sint64 SDLCALL SDL_RWsize(SDL_RWops *context);
+
+/**
+ *  Seek to \c offset relative to \c whence, one of stdio's whence values:
+ *  RW_SEEK_SET, RW_SEEK_CUR, RW_SEEK_END
  *
- *  Macros to easily read and write from an SDL_RWops structure.
+ *  \return the final offset in the data stream, or -1 on error.
  */
-/* @{ */
-#define SDL_RWsize(ctx)         (ctx)->size(ctx)
-#define SDL_RWseek(ctx, offset, whence) (ctx)->seek(ctx, offset, whence)
-#define SDL_RWtell(ctx)         (ctx)->seek(ctx, 0, RW_SEEK_CUR)
-#define SDL_RWread(ctx, ptr, size, n)   (ctx)->read(ctx, ptr, size, n)
-#define SDL_RWwrite(ctx, ptr, size, n)  (ctx)->write(ctx, ptr, size, n)
-#define SDL_RWclose(ctx)        (ctx)->close(ctx)
-/* @} *//* Read/write macros */
+extern DECLSPEC Sint64 SDLCALL SDL_RWseek(SDL_RWops *context,
+                                          Sint64 offset, int whence);
+
+/**
+ *  Return the current offset in the data stream, or -1 on error.
+ */
+extern DECLSPEC Sint64 SDLCALL SDL_RWtell(SDL_RWops *context);
 
+/**
+ *  Read up to \c maxnum objects each of size \c size from the data
+ *  stream to the area pointed at by \c ptr.
+ *
+ *  \return the number of objects read, or 0 at error or end of file.
+ */
+extern DECLSPEC size_t SDLCALL SDL_RWread(SDL_RWops *context,
+                                          void *ptr, size_t size, size_t maxnum);
+
+/**
+ *  Write exactly \c num objects each of size \c size from the area
+ *  pointed at by \c ptr to data stream.
+ *
+ *  \return the number of objects written, or 0 at error or end of file.
+ */
+extern DECLSPEC size_t SDLCALL SDL_RWwrite(SDL_RWops *context,
+                                           const void *ptr, size_t size, size_t num);
+
+/**
+ *  Close and free an allocated SDL_RWops structure.
+ *
+ *  \return 0 if successful or -1 on write error when flushing data.
+ */
+extern DECLSPEC int SDLCALL SDL_RWclose(SDL_RWops *context);
 
 /**
  *  Load all the data from an SDL data stream.
@@ -209,9 +238,17 @@ extern DECLSPEC void *SDLCALL SDL_LoadFile_RW(SDL_RWops * src, size_t *datasize,
 /**
  *  Load an entire file.
  *
- *  Convenience macro.
+ *  The data is allocated with a zero byte at the end (null terminated)
+ *
+ *  If \c datasize is not NULL, it is filled with the size of the data read.
+ *
+ *  If \c freesrc is non-zero, the stream will be closed after being read.
+ *
+ *  The data should be freed with SDL_free().
+ *
+ *  \return the data, or NULL if there was an error.
  */
-#define SDL_LoadFile(file, datasize)   SDL_LoadFile_RW(SDL_RWFromFile(file, "rb"), datasize, 1)
+extern DECLSPEC void *SDLCALL SDL_LoadFile(const char *file, size_t *datasize);
 
 /**
  *  \name Read endian functions
diff --git a/src/dynapi/SDL_dynapi_overrides.h b/src/dynapi/SDL_dynapi_overrides.h
index 5a604e8886cb6..f8c54334808af 100644
--- a/src/dynapi/SDL_dynapi_overrides.h
+++ b/src/dynapi/SDL_dynapi_overrides.h
@@ -717,3 +717,10 @@
 #define SDL_SIMDGetAlignment SDL_SIMDGetAlignment_REAL
 #define SDL_SIMDAlloc SDL_SIMDAlloc_REAL
 #define SDL_SIMDFree SDL_SIMDFree_REAL
+#define SDL_RWsize SDL_RWsize_REAL
+#define SDL_RWseek SDL_RWseek_REAL
+#define SDL_RWtell SDL_RWtell_REAL
+#define SDL_RWread SDL_RWread_REAL
+#define SDL_RWwrite SDL_RWwrite_REAL
+#define SDL_RWclose SDL_RWclose_REAL
+#define SDL_LoadFile SDL_LoadFile_REAL
diff --git a/src/dynapi/SDL_dynapi_procs.h b/src/dynapi/SDL_dynapi_procs.h
index bab4c29043b9b..5a227369507a5 100644
--- a/src/dynapi/SDL_dynapi_procs.h
+++ b/src/dynapi/SDL_dynapi_procs.h
@@ -773,3 +773,10 @@ SDL_DYNAPI_PROC(int,SDL_UIKitRunApp,(int a, char *b, SDL_main_func c),(a,b,c),re
 SDL_DYNAPI_PROC(size_t,SDL_SIMDGetAlignment,(void),(),return)
 SDL_DYNAPI_PROC(void*,SDL_SIMDAlloc,(const size_t a),(a),return)
 SDL_DYNAPI_PROC(void,SDL_SIMDFree,(void *a),(a),)
+SDL_DYNAPI_PROC(Sint64,SDL_RWsize,(SDL_RWops *a),(a),return)
+SDL_DYNAPI_PROC(Sint64,SDL_RWseek,(SDL_RWops *a, Sint64 b, int c),(a,b,c),return)
+SDL_DYNAPI_PROC(Sint64,SDL_RWtell,(SDL_RWops *a),(a),return)
+SDL_DYNAPI_PROC(size_t,SDL_RWread,(SDL_RWops *a, void *b, size_t c, size_t d),(a,b,c,d),return)
+SDL_DYNAPI_PROC(size_t,SDL_RWwrite,(SDL_RWops *a, const void *b, size_t c, size_t d),(a,b,c,d),return)
+SDL_DYNAPI_PROC(int,SDL_RWclose,(SDL_RWops *a),(a),return)
+SDL_DYNAPI_PROC(void*,SDL_LoadFile,(const char *a, size_t *b),(a,b),return)
diff --git a/src/file/SDL_rwops.c b/src/file/SDL_rwops.c
index 41f7b0fbb1a12..56ffb730c5232 100644
--- a/src/file/SDL_rwops.c
+++ b/src/file/SDL_rwops.c
@@ -752,6 +752,48 @@ SDL_LoadFile_RW(SDL_RWops * src, size_t *datasize, int freesrc)
     return data;
 }
 
+void *
+SDL_LoadFile(const char *file, size_t *datasize)
+{
+   return SDL_LoadFile_RW(SDL_RWFromFile(file, "rb"), datasize, 1);
+}
+
+Sint64
+SDL_RWsize(SDL_RWops *context)
+{
+    return context->size(context);
+}
+
+Sint64
+SDL_RWseek(SDL_RWops *context, Sint64 offset, int whence)
+{
+    return context->seek(context, offset, whence);
+}
+
+Sint64
+SDL_RWtell(SDL_RWops *context)
+{
+    return context->seek(context, 0, RW_SEEK_CUR);
+}
+
+size_t
+SDL_RWread(SDL_RWops *context, void *ptr, size_t size, size_t maxnum)
+{
+    return context->read(context, ptr, size, maxnum);
+}
+
+size_t
+SDL_RWwrite(SDL_RWops *context, const void *ptr, size_t size, size_t num)
+{
+    return context->write(context, ptr, size, num);
+}
+
+int
+SDL_RWclose(SDL_RWops *context)
+{
+    return context->close(context);
+}
+
 /* Functions for dynamically reading and writing endian-specific values */
 
 Uint8