* revert the rewrite of MP4_GETSTRINGZ in the previous commit, as strnlen is a...

* revert the rewrite of MP4_GETSTRINGZ in the previous commit, as strnlen is a GNU-extension and therefore unavailable on Mac OS X and other platforms. I think this way is easier than writing an own implementation for OSX, but feel free to tell me otherwise. (closes #1213)

modules/demux/mp4/libmp4.c

@@ -62,21 +62,19 @@
     MP4_GET3BYTES( p_void->i_flags )
 
 #define MP4_GETSTRINGZ( p_str ) \
-    if( (i_read > 0) && (p_peek[0]) )   \
+    if( ( i_read > 0 )&&(p_peek[0] ) ) \
     { \
-        const int __i_copy__ = strnlen( (char*)p_peek, i_read-1 );  \
-        p_str = calloc( sizeof(char), __i_copy__+1 );               \
-        if( __i_copy__ > 0 ) memcpy( p_str, p_peek, __i_copy__ );   \
-        p_str[__i_copy__] = 0;      \
-        p_peek += __i_copy__ + 1;   \
-        i_read -= __i_copy__ + 1;   \
+        p_str = calloc( sizeof( char ), __MIN( strlen( (char*)p_peek ), i_read )+1);\
+        memcpy( p_str, p_peek, __MIN( strlen( (char*)p_peek ), i_read ) ); \
+        p_str[__MIN( strlen( (char*)p_peek ), i_read )] = 0; \
+        p_peek += strlen( (char *)p_str ) + 1; \
+        i_read -= strlen( (char *)p_str ) + 1; \
     } \
     else \
     { \
         p_str = NULL; \
     }
 
-
 #define MP4_READBOX_ENTER( MP4_Box_data_TYPE_t ) \
     int64_t  i_read = p_box->i_size; \
     uint8_t *p_peek, *p_buff; \