add fuzzer entry point

regress/CMakeLists.txt

diff --git a/regress/CMakeLists.txt b/regress/CMakeLists.txt
index 0365376..756a270 100644
--- a/regress/CMakeLists.txt
+++ b/regress/CMakeLists.txt
@@ -205,11 +205,5 @@
 
 ADD_CUSTOM_TARGET(check COMMAND ${CMAKE_CTEST_COMMAND})
 
-IF(CMAKE_C_COMPILER_ID STREQUAL "Clang" AND NOT (CLANG_VERSION_MAJOR LESS 6) )
-    ENABLE_LANGUAGE(CXX)
-    ADD_EXECUTABLE(fuzz_target zip_read_fuzzer.cc)
-    TARGET_COMPILE_OPTIONS(fuzz_target PRIVATE -g -O1 -fsanitize=fuzzer)
-    TARGET_LINK_LIBRARIES(fuzz_target PUBLIC zip PRIVATE -fsanitize=fuzzer)
-ELSE()
-    message(AUTHOR_WARNING "Can't build fuzz target with this compiler")
-ENDIF()
\ No newline at end of file
+ADD_EXECUTABLE(fuzz_main fuzz_main.c)
+TARGET_LINK_LIBRARIES(fuzz_main zip)
\ No newline at end of file

regress/fuzz_main.c

diff --git a/regress/fuzz_main.c b/regress/fuzz_main.c
new file mode 100644
index 0000000..694322e
--- /dev/null
+++ b/regress/fuzz_main.c
@@ -0,0 +1,52 @@
+#include "zip_read_fuzzer.cc"
+#include <stdio.h>
+#include <stdlib.h>
+
+/* fuzz target entry point, works without libFuzzer */
+
+int main(int argc, char **argv)
+{
+    FILE *f;
+    char *buf = NULL;
+    long siz_buf;
+
+    if(argc < 2)
+    {
+        fprintf(stderr, "no input file\n");
+        goto err;
+    }
+
+    f = fopen(argv[1], "rb");
+    if(f == NULL)
+    {
+        fprintf(stderr, "error opening input file %s\n", argv[1]);
+        goto err;
+    }
+
+    fseek(f, 0, SEEK_END);
+
+    siz_buf = ftell(f);
+    rewind(f);
+
+    if(siz_buf < 1) goto err;
+
+    buf = (char*)malloc(siz_buf);
+    if(buf == NULL)
+    {
+        fprintf(stderr, "malloc() failed\n");
+        goto err;
+    }
+
+    if(fread(buf, siz_buf, 1, f) != 1)
+    {
+        fprintf(stderr, "fread() failed\n");
+        goto err;
+    }
+
+    (void)LLVMFuzzerTestOneInput((uint8_t*)buf, siz_buf);
+
+err:
+    free(buf);
+
+    return 0;
+}