From ae2452d280a07952529ea82bcc2288d73bc3ccdf Mon Sep 17 00:00:00 2001
From: Ray <raysan5@gmail.com>
Date: Mon, 9 Sep 2019 21:56:16 +0200
Subject: [PATCH] ADDED small compression API

 - ADDED: CompressData()
 - ADDED: DecompressData()
---
 src/config.h    |  3 ++-
 src/config.h.in |  2 ++
 src/core.c      | 37 +++++++++++++++++++++++++++++++++++++
 src/raylib.h    |  3 +++
 4 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/src/config.h b/src/config.h
index 250b702a..068e2c43 100644
--- a/src/config.h
+++ b/src/config.h
@@ -56,7 +56,8 @@
 #define SUPPORT_GIF_RECORDING       1
 // Allow scale all the drawn content to match the high-DPI equivalent size (only PLATFORM_DESKTOP)
 //#define SUPPORT_HIGH_DPI            1
-
+// Support CompressData() and DecompressData() functions
+#define SUPPORT_COMPRESSION_API     1
 
 //------------------------------------------------------------------------------------
 // Module: rlgl - Configuration Flags
diff --git a/src/config.h.in b/src/config.h.in
index 10e37726..6a71b77b 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -19,6 +19,8 @@
 #cmakedefine SUPPORT_GIF_RECORDING 1
 // Support high DPI displays
 #cmakedefine SUPPORT_HIGH_DPI 1
+// Support CompressData() and DecompressData() functions
+#cmakedefine SUPPORT_COMPRESSION_API 1
 
 // rlgl.h
 // Support VR simulation functionality (stereo rendering)
diff --git a/src/core.c b/src/core.c
index 44ac12b5..1506a4fa 100644
--- a/src/core.c
+++ b/src/core.c
@@ -74,6 +74,11 @@
 *       Allow scale all the drawn content to match the high-DPI equivalent size (only PLATFORM_DESKTOP)
 *       NOTE: This flag is forced on macOS, since most displays are high-DPI
 *
+*   #define SUPPORT_COMPRESSION_API
+*       Support CompressData() and DecompressData() functions, those functions use zlib implementation
+*       provided by stb_image and stb_image_write libraries, so, those libraries must be enabled on textures module
+*       for linkage
+*
 *   DEPENDENCIES:
 *       rglfw    - Manage graphic device, OpenGL context and inputs on PLATFORM_DESKTOP (Windows, Linux, OSX. FreeBSD, OpenBSD, NetBSD, DragonFly)
 *       raymath  - 3D math functionality (Vector2, Vector3, Matrix, Quaternion)
@@ -252,6 +257,12 @@
     #include <emscripten/html5.h>       // Emscripten HTML5 library
 #endif
 
+#if defined(SUPPORT_COMPRESSION_API)
+    // NOTE: Those declarations require stb_image and stb_image_write definitions, included in textures module
+    unsigned char *stbi_zlib_compress(unsigned char *data, int data_len, int *out_len, int quality);
+    char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen);
+#endif
+
 //----------------------------------------------------------------------------------
 // Defines and Macros
 //----------------------------------------------------------------------------------
@@ -2019,6 +2030,32 @@ long GetFileModTime(const char *fileName)
     return 0;
 }
 
+// Compress data (DEFLATE algorythm)
+unsigned char *CompressData(unsigned char *data, int dataLength, int *compDataLength)
+{
+    #define COMPRESSION_QUALITY_DEFLATE  8
+    
+    unsigned char *compData = NULL;
+    
+#if defined(SUPPORT_COMPRESSION_API)
+    compData = stbi_zlib_compress(data, dataLength, compDataLength, COMPRESSION_QUALITY_DEFLATE);
+#endif
+
+    return compData;
+}
+
+// Decompress data (DEFLATE algorythm)
+char *DecompressData(char *compData, int compDataLength, int *dataLength)
+{
+    char *data = NULL;
+    
+#if defined(SUPPORT_COMPRESSION_API)
+    data = stbi_zlib_decode_malloc(compData, compDataLength, dataLength);
+#endif
+
+    return data;
+}
+
 // Save integer value to storage file (to defined position)
 // NOTE: Storage positions is directly related to file memory layout (4 bytes each integer)
 void StorageSaveValue(int position, int value)
diff --git a/src/raylib.h b/src/raylib.h
index ed0314d3..3bbf471b 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -955,6 +955,9 @@ RLAPI char **GetDroppedFiles(int *count);                         // Get dropped
 RLAPI void ClearDroppedFiles(void);                               // Clear dropped files paths buffer (free memory)
 RLAPI long GetFileModTime(const char *fileName);                  // Get file modification time (last write time)
 
+RLAPI unsigned char *CompressData(unsigned char *data, int dataLength, int *compDataLength); // Compress data (DEFLATE algorythm)
+RLAPI char *DecompressData(char *compData, int compDataLength, int *dataLength);             // Decompress data (DEFLATE algorythm)
+
 // Persistent storage management
 RLAPI void StorageSaveValue(int position, int value);             // Save integer value to storage file (to defined position)
 RLAPI int StorageLoadValue(int position);                         // Load integer value from storage file (from defined position)