libragephoto: introduce C library port

CMakeLists.txt: fixes for MSVC and C library support
RagePhoto: non C++11 support
RagePhotoC: clarify C instance support in comment
RagePhotoTypedefs: add typedefs for C library

src/RagePhoto.cpp

@@ -970,7 +970,11 @@ bool RagePhoto::saveFile(const std::string &filename, uint32_t photoFormat)
             m_data->error = Error::Uninitialised; // 0
             return false;
         }
+#if (RAGEPHOTO_CXX_STD >= 11) && (__cplusplus >= 201103L)
         ofs << sdata;
+#else
+        ofs.write(sdata.data(), sdata.size());
+#endif
         ok = ofs.good();
         ofs.close();
         return ok;

src/RagePhotoC.h

@@ -36,7 +36,7 @@ extern "C" {
 * \file RagePhotoC.h
 */
 
-/** RagePhoto C++ class typedef for C API. */
+/** RagePhoto C instance/C++ class typedef. */
 typedef void* ragephoto_t;
 
 /** Opens a \p ragephoto_t instance. */

src/RagePhotoTypedefs.h

@@ -70,6 +70,12 @@ typedef struct RagePhotoFormatParser {
     ragephoto_saveszfunc_t funcSaveSz; /**< Pointer to saveSize function */
 } RagePhotoFormatParser;
 
+/** RagePhoto instance struct for storing data and format parser pointer. */
+typedef struct RagePhotoInstance {
+    RagePhotoData *data; /**< Pointer for data */
+    RagePhotoFormatParser *parser; /**< Pointer for format parser */
+} RagePhotoInstance;
+
 /* RagePhoto default sizes */
 #define RAGEPHOTO_DEFAULT_GTA5_PHOTOBUFFER 524288UL /**< GTA V default Photo Buffer Size */
 #define RAGEPHOTO_DEFAULT_RDR2_PHOTOBUFFER 1048576UL /**< RDR 2 default Photo Buffer Size */
@@ -126,6 +132,10 @@ typedef struct RagePhotoFormatParser {
 #define RAGEPHOTO_FORMAT_GTA5 0x01000000UL /**< GTA V Photo Format */
 #define RAGEPHOTO_FORMAT_RDR2 0x04000000UL /**< RDR 2 Photo Format */
 
+/* RagePhoto sign initials */
+#define RAGEPHOTO_SIGNINITIAL_GTA5 0xE47AB81CUL /**< GTA V Sign Initial */
+#define RAGEPHOTO_SIGNINITIAL_RDR2 0x00FEEB1EUL /**< RDR 2 Sign Initial */
+
 #ifdef __cplusplus
 }
 #endif // __cplusplus