add first version of oss-fuzz support

c/encodeBinary_fuzzer.c

@@ -0,0 +1,22 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include "qrcodegen.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+
+  uint8_t qr0[qrcodegen_BUFFER_LEN_MAX];
+  bool ok = qrcodegen_encodeBinary((uint8_t *) Data, Size, qr0, qrcodegen_Ecc_MEDIUM, qrcodegen_VERSION_MIN, qrcodegen_VERSION_MAX, qrcodegen_Mask_4, true);
+  if (!ok)
+      return 1;
+
+  return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+

c/fuzzing.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+cd "$(dirname "$0")"
+make -j
+$CXX $CXXFLAGS encodeBinary_fuzzer.c -I. \
+    -o $OUT/encodeBinary_fuzzer \
+    $LIB_FUZZING_ENGINE -L. -lqrcodegen