Added functionality: Storage values

Two new functions added to save/load values as binary data:
- StorageSaveValue()
- StorageLoadValue()

4 files changed, 149 insertions, 0 deletions

diff --git a/examples/core_storage_values.c b/examples/core_storage_values.c
new file mode 100644
index 00000000..3190d0a0
--- /dev/null
+++ b/examples/core_storage_values.c
@@ -0,0 +1,85 @@
+/*******************************************************************************************
+*
+*   raylib [core] example - Storage save/load values
+*
+*   This example has been created using raylib 1.4 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+// NOTE: Storage positions must start with 0, directly related to file memory layout
+typedef enum { STORAGE_SCORE = 0, STORAGE_HISCORE } StorageData;
+
+int main()
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    int screenWidth = 800;
+    int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [core] example - storage save/load values");
+    
+    int score = 0;
+    int hiscore = 0;
+    
+    int framesCounter = 0;
+    
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsKeyPressed(KEY_R))
+        {
+            score = GetRandomValue(1000, 2000);
+            hiscore = GetRandomValue(2000, 4000);
+        }
+        
+        if (IsKeyPressed(KEY_ENTER))
+        {
+            StorageSaveValue(STORAGE_SCORE, score);
+            StorageSaveValue(STORAGE_HISCORE, hiscore);
+        }
+        else if (IsKeyPressed(KEY_SPACE))
+        {
+            // NOTE: If requested position could not be found, value 0 is returned
+            score = StorageLoadValue(STORAGE_SCORE);
+            hiscore = StorageLoadValue(STORAGE_HISCORE);
+        }
+        
+        framesCounter++;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            DrawText(FormatText("SCORE: %i", score), 280, 130, 40, MAROON);
+            DrawText(FormatText("HI-SCORE: %i", hiscore), 210, 200, 50, BLACK);
+            
+            DrawText(FormatText("frames: %i", framesCounter), 10, 10, 20, LIME);
+            
+            DrawText("Press R to generate random numbers", 220, 40, 20, LIGHTGRAY);
+            DrawText("Press ENTER to SAVE values", 250, 310, 20, LIGHTGRAY);
+            DrawText("Press SPACE to LOAD values", 252, 350, 20, LIGHTGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------   
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
\ No newline at end of file
diff --git a/examples/core_storage_values.png b/examples/core_storage_values.png
new file mode 100644
index 00000000..6cfd552d
--- /dev/null
+++ b/examples/core_storage_values.png
diff --git a/src/core.c b/src/core.c
index 14510a1b..06260281 100644
--- a/src/core.c
+++ b/src/core.c
@@ -708,6 +708,67 @@ void ClearDroppedFiles(void)
 }
 #endif
 
+// Storage save integer value (to defined position)
+// NOTE: Storage positions is directly related to file memory layout (4 bytes each integer)
+void StorageSaveValue(int position, int value)
+{
+    FILE *storageFile = NULL;
+
+    // Try open existing file to append data
+    storageFile = fopen("storage.data", "rb+");      
+
+    // If file doesn't exist, create a new storage data file
+    if (!storageFile) storageFile = fopen("storage.data", "wb");
+
+    if (!storageFile) TraceLog(WARNING, "Storage data file could not be created");
+    else
+    {
+        // Get file size
+        fseek(storageFile, 0, SEEK_END);
+        int fileSize = ftell(storageFile);  // Size in bytes
+        fseek(storageFile, 0, SEEK_SET);
+        
+        if (fileSize < (position*4)) TraceLog(WARNING, "Storage position could not be found");
+        else
+        {
+            fseek(storageFile, (position*4), SEEK_SET);
+            fwrite(&value, 1, 4, storageFile);
+        }
+        
+        fclose(storageFile);
+    }
+}
+
+// Storage load integer value (from defined position)
+// NOTE: If requested position could not be found, value 0 is returned
+int StorageLoadValue(int position)
+{
+    int value = 0;
+    
+    // Try open existing file to append data
+    FILE *storageFile = fopen("storage.data", "rb");      
+
+    if (!storageFile) TraceLog(WARNING, "Storage data file could not be found");
+    else
+    {
+        // Get file size
+        fseek(storageFile, 0, SEEK_END);
+        int fileSize = ftell(storageFile);  // Size in bytes
+        rewind(storageFile);
+        
+        if (fileSize < (position*4)) TraceLog(WARNING, "Storage position could not be found");
+        else
+        {
+            fseek(storageFile, (position*4), SEEK_SET);
+            fread(&value, 1, 4, storageFile);
+        }
+        
+        fclose(storageFile);
+    }
+    
+    return value;
+}
+
 // TODO: Gives the ray trace from mouse position
 Ray GetMouseRay(Vector2 mousePosition, Camera camera)
 {
diff --git a/src/raylib.h b/src/raylib.h
index 99a6979c..f1203537 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -540,6 +540,9 @@ bool IsFileDropped(void);                                   // Check if a file h
 char **GetDroppedFiles(int *count);                         // Retrieve dropped files into window
 void ClearDroppedFiles(void);                               // Clear dropped files paths buffer
 
+void StorageSaveValue(int position, int value);             // Storage save integer value (to defined position)
+int StorageLoadValue(int position);                         // Storage load integer value (from defined position)
+
 //------------------------------------------------------------------------------------
 // Input Handling Functions (Module: core)
 //------------------------------------------------------------------------------------