projects/geos/patch.diff

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 14506516..2e236476 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -11,4 +11,5 @@
 add_subdirectory(unit)
 add_subdirectory(xmltester)
 add_subdirectory(bigtest)
+add_subdirectory(fuzz)
 
diff --git a/tests/fuzz/CMakeLists.txt b/tests/fuzz/CMakeLists.txt
new file mode 100644
index 00000000..d0bd7a02
--- /dev/null
+++ b/tests/fuzz/CMakeLists.txt
@@ -0,0 +1,15 @@
+################################################################################
+# Part of CMake configuration for GEOS
+#
+# Copyright (C) 2018 Mateusz Loskot <mateusz@loskot.net>
+#
+# This is free software; you can redistribute and/or modify it under
+# the terms of the GNU Lesser General Public Licence as published
+# by the Free Software Foundation.
+# See the COPYING file for more information.
+################################################################################
+if(DEFINED ENV{LIB_FUZZING_ENGINE})
+  add_executable(fuzz_geo2 fuzz_geo2.c)
+  target_include_directories(fuzz_geo2 PUBLIC $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/include>)
+  target_link_libraries(fuzz_geo2 geos_c $ENV{LIB_FUZZING_ENGINE})
+endif()
diff --git a/tests/fuzz/fuzz_geo2.c b/tests/fuzz/fuzz_geo2.c
new file mode 100644
index 00000000..ceee7ea6
--- /dev/null
+++ b/tests/fuzz/fuzz_geo2.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "geos_c.h"
+
+static int initialized = 0;
+FILE * flogOut;
+
+void
+notice(const char *fmt, ...) {
+    va_list ap;
+    fprintf( flogOut, "NOTICE: ");
+    va_start (ap, fmt);
+    vfprintf( flogOut, fmt, ap);
+    va_end(ap);
+    fprintf( flogOut, "\n" );
+}
+
+void
+log_and_exit(const char *fmt, ...) {
+    va_list ap;
+    fprintf( flogOut, "ERROR: ");
+    va_start (ap, fmt);
+    vfprintf( flogOut, fmt, ap);
+    va_end(ap);
+    fprintf( flogOut, "\n" );
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+    if (initialized == 0) {
+        flogOut = fopen("/dev/null", "wb");
+        initGEOS(notice, log_and_exit);
+        initialized = 1;
+    }
+    size_t sep;
+    for (sep = 0; sep < Size; sep ++) {
+        if (Data[sep] == 0) {
+            break;
+        }
+    }
+    if (sep == Size) {
+        return 0;
+    }
+    GEOSGeometry *g1 = GEOSGeomFromWKT(Data);
+
+    if (g1 != NULL) {
+        GEOSGeometry *g2 = GEOSGeomFromWKB_buf(Data+sep, Size-sep);
+        if (g2 != NULL) {
+            size_t usize;
+            GEOSGeometry *g3 = GEOSIntersection(g1, g2);
+            GEOSGeom_destroy(g3);
+            g3 = GEOSDifference(g1, g2);
+            GEOSGeom_destroy(g3);
+            g3 = GEOSUnion(g1, g2);
+            GEOSGeom_destroy(g3);
+            unsigned char* uptr = GEOSGeomToWKB_buf(g1, &usize);
+            free(uptr);
+            GEOSGeom_destroy(g2);
+        }
+        char * r = GEOSGeomToWKT(g1);
+        free(r);
+        GEOSGeom_destroy(g1);
+    }
+    return 0;
+}
+