Add callbacks to allow an application to override file reading in raylib with it's own code.

src/core.c

@@ -2595,7 +2595,7 @@ bool SaveStorageValue(unsigned int position, int value)
 
     unsigned int dataSize = 0;
     unsigned int newDataSize = 0;
-    unsigned char *fileData = LoadFileData(path, &dataSize);
+    unsigned char *fileData = RLLoadFileData(path, &dataSize);
     unsigned char *newFileData = NULL;
 
     if (fileData != NULL)
@@ -2673,7 +2673,7 @@ int LoadStorageValue(unsigned int position)
 #endif
 
     unsigned int dataSize = 0;
-    unsigned char *fileData = LoadFileData(path, &dataSize);
+    unsigned char *fileData = RLLoadFileData(path, &dataSize);
 
     if (fileData != NULL)
     {

src/models.c

@@ -1012,7 +1012,7 @@ ModelAnimation *LoadModelAnimations(const char *fileName, int *animCount)
     #define IQM_VERSION     2                   // only IQM version 2 supported
 
     unsigned int fileSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &fileSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &fileSize);
     unsigned char *fileDataPtr = fileData;
 
     typedef struct IQMHeader {
@@ -3034,7 +3034,7 @@ static Model LoadOBJ(const char *fileName)
     tinyobj_material_t *materials = NULL;
     unsigned int materialCount = 0;
 
-    char *fileData = LoadFileText(fileName);
+    char *fileData = RLLoadFileText(fileName);
 
     if (fileData != NULL)
     {
@@ -3199,7 +3199,7 @@ static Model LoadIQM(const char *fileName)
     #define MATERIAL_NAME_LENGTH 32         // Material name string length
 
     unsigned int fileSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &fileSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &fileSize);
     unsigned char *fileDataPtr = fileData;
 
     // IQM file structs
@@ -3738,7 +3738,7 @@ static Model LoadGLTF(const char *fileName)
 
     // glTF file loading
     unsigned int dataSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &dataSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &dataSize);
 
     if (fileData == NULL) return model;
 

src/raudio.c

@@ -385,7 +385,7 @@ static Wave LoadMP3(const unsigned char *fileData, unsigned int fileSize);   //
 
 #if defined(RAUDIO_STANDALONE)
 static bool IsFileExtension(const char *fileName, const char *ext); // Check file extension
-static unsigned char *LoadFileData(const char *fileName, unsigned int *bytesRead);     // Load file data as byte array (read)
+static unsigned char *RLLoadFileData(const char *fileName, unsigned int *bytesRead);     // Load file data as byte array (read)
 static bool SaveFileData(const char *fileName, void *data, unsigned int bytesToWrite); // Save data to file from byte array (write)
 static bool SaveFileText(const char *fileName, char *text);         // Save text data to file (write), string must be '\0' terminated
 #endif
@@ -690,7 +690,7 @@ Wave LoadWave(const char *fileName)
 
     // Loading file to memory
     unsigned int fileSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &fileSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &fileSize);
 
     if (fileData != NULL)
     {
@@ -2087,7 +2087,7 @@ static bool IsFileExtension(const char *fileName, const char *ext)
 }
 
 // Load data from file into a buffer
-static unsigned char *LoadFileData(const char *fileName, unsigned int *bytesRead)
+static unsigned char *RLLoadFileData(const char *fileName, unsigned int *bytesRead)
 {
     unsigned char *data = NULL;
     *bytesRead = 0;

src/raylib.h

@@ -979,6 +979,14 @@ RLAPI void TakeScreenshot(const char *fileName);                  // Takes a scr
 RLAPI int GetRandomValue(int min, int max);                       // Returns a random value between min and max (both included)
 
 // Files management functions
+
+// Virtual file system override functions
+typedef unsigned char* (*LoadFileBinFunction)(const char* fileName, unsigned int* bytesRead);       // Load file data as byte array (read)
+typedef char* (*LoadFileTextFunction)(const char* fileName);                                        // Load text data from file (read), returns a '\0' terminated string
+
+RLAPI void SetFileSystemFunctions(LoadFileBinFunction loadBin, LoadFileTextFunction loadText);            // override default file access functions
+
+// Native File Management
 RLAPI unsigned char *LoadFileData(const char *fileName, unsigned int *bytesRead);     // Load file data as byte array (read)
 RLAPI void UnloadFileData(unsigned char *data);                   // Unload file data allocated by LoadFileData()
 RLAPI bool SaveFileData(const char *fileName, void *data, unsigned int bytesToWrite); // Save data to file from byte array (write), returns true on success
@@ -1332,6 +1340,7 @@ RLAPI void DrawGizmo(Vector3 position);
 
 // Model loading/unloading functions
 RLAPI Model LoadModel(const char *fileName);                                                            // Load model from files (meshes and materials)
+RLAPI Model LoadModelFromMemory(const char* fileType, const unsigned char* fileData, int dataSize);     // Load model from memory (meshes and materials)
 RLAPI Model LoadModelFromMesh(Mesh mesh);                                                               // Load model from generated mesh (default material)
 RLAPI void UnloadModel(Model model);                                                                    // Unload model (including meshes) from memory (RAM and/or VRAM)
 RLAPI void UnloadModelKeepMeshes(Model model);                                                          // Unload model (but not meshes) from memory (RAM and/or VRAM)

src/text.c

@@ -342,7 +342,7 @@ Font LoadFontEx(const char *fileName, int fontSize, int *fontChars, int charsCou
 
     // Loading file to memory
     unsigned int fileSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &fileSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &fileSize);
 
     if (fileData != NULL)
     {
@@ -1740,7 +1740,7 @@ static Font LoadBMFont(const char *fileName)
 
     int base = 0;   // Useless data
 
-    char *fileText = LoadFileText(fileName);
+    char *fileText = RLLoadFileText(fileName);
 
     if (fileText == NULL) return font;
 

src/textures.c

@@ -210,7 +210,7 @@ Image LoadImage(const char *fileName)
 
     // Loading file to memory
     unsigned int fileSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &fileSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &fileSize);
 
     if (fileData != NULL)
     {
@@ -232,7 +232,7 @@ Image LoadImageRaw(const char *fileName, int width, int height, int format, int
     Image image = { 0 };
 
     unsigned int dataSize = 0;
-    unsigned char *fileData = LoadFileData(fileName, &dataSize);
+    unsigned char *fileData = RLLoadFileData(fileName, &dataSize);
 
     if (fileData != NULL)
     {
@@ -268,7 +268,7 @@ Image LoadImageAnim(const char *fileName, int *frames)
     if (IsFileExtension(fileName, ".gif"))
     {
         unsigned int dataSize = 0;
-        unsigned char *fileData = LoadFileData(fileName, &dataSize);
+        unsigned char *fileData = RLLoadFileData(fileName, &dataSize);
 
         if (fileData != NULL)
         {

src/utils.c

@@ -175,6 +175,32 @@ void MemFree(void *ptr)
     RL_FREE(ptr);
 }
 
+LoadFileBinFunction LoadBinCallback = NULL;
+LoadFileTextFunction LoadFileTextCallback = NULL;
+
+// virtual file systems functions
+void SetFileSystemFunctions(LoadFileBinFunction loadBin, LoadFileTextFunction loadText)
+{
+    LoadBinCallback = loadBin;
+    LoadFileTextCallback = loadText;
+}
+
+unsigned char* RLLoadFileData(const char* fileName, unsigned int* bytesRead)
+{
+    if (LoadBinCallback != NULL)
+        return LoadBinCallback(fileName, bytesRead);
+    
+    return LoadFileData(fileName, bytesRead);
+}
+
+char* RLLoadFileText(const char* fileName)
+{
+    if (LoadFileTextCallback != NULL)
+        return LoadFileTextCallback(fileName);
+
+    return LoadFileText(fileName);
+}
+
 // Load data from file into a buffer
 unsigned char *LoadFileData(const char *fileName, unsigned int *bytesRead)
 {

src/utils.h

@@ -27,6 +27,12 @@
 #ifndef UTILS_H
 #define UTILS_H
 
+// internal loader functions that may or may not call the virtual file system
+unsigned char* RLLoadFileData(const char* fileName, unsigned int* bytesRead);
+void RLUnloadFileData(unsigned char* data);
+char* RLLoadFileText(const char* fileName);
+void RLUnloadFileText(unsigned char* text);
+
 #if defined(PLATFORM_ANDROID)
     #include <stdio.h>                      // Required for: FILE
     #include <android/asset_manager.h>      // Required for: AAssetManager