2 files changed, 72 insertions, 1 deletions

diff --git a/include/engine.h b/include/engine.h
index 7df7e9f..6925b5f 100644
--- a/include/engine.h
+++ b/include/engine.h
@@ -1,6 +1,8 @@
 #ifndef __ENGINE_H__
 #define __ENGINE_H__
 
+#include <SDL.h>
+#include <Handle.h>
 #include <Exceptions.h>
 
 namespace mogltk {
@@ -8,6 +10,7 @@ namespace mogltk {
       public:
         static int setup() throw(GeneralException);
         static int GetInited();
+	static SDL_RWops * RWFromHandle(Handle *) throw (GeneralException);
       private:
         static int inited;
     };
diff --git a/lib/engine.cc b/lib/engine.cc
index 6e3f303..bcf5dc0 100644
--- a/lib/engine.cc
+++ b/lib/engine.cc
@@ -1,4 +1,3 @@
-#include <SDL/SDL.h>
 #include "engine.h"
 
 #define _(x) x
@@ -23,3 +22,72 @@ int mogltk::engine::setup() throw(GeneralException) {
 int mogltk::engine::GetInited() {
     return inited;
 }
+
+class embedRWops : public Base {
+  public:
+      embedRWops(Handle *);
+      ~embedRWops();
+    int seek(int, int);
+    int read(void *, int, int);
+    int write(const void *, int, int);
+  private:
+    Handle * h;
+};
+
+embedRWops::embedRWops(Handle * ah) : h(new Handle(*ah)) {}
+
+embedRWops::~embedRWops() {
+    delete h;
+}
+
+int embedRWops::seek(int offset, int whence) {
+    return h->seek(offset, whence);
+}
+
+int embedRWops::read(void * ptr, int size, int num) {
+    return h->read(ptr, size * num);
+}
+
+int embedRWops::write(const void * ptr, int size, int num) {
+    return h->write(ptr, size * num);
+}
+
+static int embedRWseek(SDL_RWops * context, int offset, int whence) {
+    if (context->hidden.unknown.data1)
+	return ((embedRWops *)(context->hidden.unknown.data1))->seek(offset, whence);
+    return -1;
+}
+
+static int embedRWread(SDL_RWops * context, void * ptr, int size, int num) {
+    if (context->hidden.unknown.data1)
+	return ((embedRWops *)(context->hidden.unknown.data1))->read(ptr, size, num);
+    return -1;
+}
+
+static int embedRWwrite(SDL_RWops * context, const void * ptr, int size, int num) {
+    if (context->hidden.unknown.data1)
+	return ((embedRWops *)(context->hidden.unknown.data1))->write(ptr, size, num);
+    return -1;
+}
+
+static int embedRWclose(SDL_RWops * context) {
+    if (context->hidden.unknown.data1) {
+	delete ((embedRWops *)(context->hidden.unknown.data1));
+	return 0;
+    }
+    return -1;
+}
+
+SDL_RWops * mogltk::engine::RWFromHandle(Handle * h) throw (GeneralException) {
+    SDL_RWops * r = 0;
+    if (h) {
+	if (!(r = SDL_AllocRW()))
+	    throw GeneralException(_("Couldn't allocate memory for SDL_RWops"));
+	r->hidden.unknown.data1 = (void *) new embedRWops(h);
+	r->seek = embedRWseek;
+	r->read = embedRWread;
+	r->write = embedRWwrite;
+	r->close = embedRWclose;
+    }
+    return r;
+}