Add OSS fuzz corpus for ojph_compress_fuzz_target

fuzzing/fuzz_targets/ojph_compress_fuzz_target.cpp

@@ -35,6 +35,7 @@
 //***************************************************************************/
 
 #include <cstdint>
+#include <vector>
 #include <cstdlib>
 #include <iostream>
 
@@ -57,8 +58,9 @@
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
 {
-  if (Size < 5)
+  if (Size < 5) {
     return 0;
+  }
 
   ojph::ui32 width     = (Data[0] & 0x7F) + 1;
   ojph::ui32 height    = (Data[1] & 0x7F) + 1;
@@ -129,3 +131,27 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
   }
   return 0;
 }
+
+#ifdef OJPH_FUZZ_TARGET_MAIN
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    return -1;
+  }
+  FILE *f = fopen(argv[1], "rb");
+  if (!f) { return -1; }
+  fseek(f, 0, SEEK_END);
+  long len = ftell(f);
+  if (len < 0) {
+    return -1;
+  }
+  rewind(f);
+  std::vector<uint8_t> buf(len);
+  size_t n = fread(buf.data(), 1, len, f);
+  if(n != static_cast<size_t>(len)) {
+    return -1;
+  }
+  fclose(f);
+  LLVMFuzzerTestOneInput(buf.data(), buf.size());
+  return 0;
+}
+#endif