Testing if the zzip_read is the old (with char *) or new

(with void *) version. When the old one is detected we
cast the second parameter to char *

desmume/configure.ac

@@ -34,7 +34,17 @@ dnl - Check for zlib
 AC_CHECK_LIB(z, gzopen, [], [AC_MSG_ERROR([zlib was not found, we can't go further. Please install it or specify the location where it's installed.])])
 
 dnl - Check for zziplib
-AC_CHECK_LIB(zzip, zzip_open)
+AC_CHECK_LIB(zzip, zzip_open, [
+	LIBS="-lzzip $LIBS"
+	AC_DEFINE([HAVE_LIBZZIP])
+	AC_MSG_CHECKING([[whether zzip use void * as second parameter]])
+	AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[#include <zzip/lib.h>]], [[
+		void * v;
+		zzip_read(NULL, v, 0);]]),
+        	AC_MSG_RESULT(yes),
+		AC_DEFINE([ZZIP_OLD_READ])
+		AC_MSG_RESULT(no))
+])
 
 dnl - Check for SDL
 AC_PATH_PROGS(SDLCONFIG, [sdl-config sdl11-config])

desmume/src/ROMReader.cpp

@@ -227,6 +227,10 @@ int ZIPROMReaderSeek(void * file, int offset, int whence)
 
 int ZIPROMReaderRead(void * file, void * buffer, u32 size)
 {
+#ifdef ZZIP_OLD_READ
+	return zzip_read((ZZIP_FILE*)file, (char *) buffer, size);
+#else
 	return zzip_read((ZZIP_FILE*)file, buffer, size);
+#endif
 }
 #endif