Added initial fuzzer for integration with OSS-Fuzz.

fuzz/fuzz-conv.c

@@ -0,0 +1,51 @@
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+#include "wc.h"
+
+char *get_null_terminated(const uint8_t *data, size_t size) {
+    char *new_str = (char *)malloc(size+1);
+    if (new_str == NULL){
+            return NULL;
+    }
+    memcpy(new_str, data, size);
+    new_str[size] = '\0';
+    return new_str;
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size){
+    if (size < 30) {
+        return 0;
+    }
+
+    char *new_str1 = get_null_terminated(data, 20);
+    data += 20; size -= 20;
+    char *new_str2 = get_null_terminated(data, size);
+
+    wc_ces old, from, to;
+    from = wc_guess_charset_short(new_str1,0);
+    to = wc_guess_charset_short(new_str2, 0);
+
+    char filename[256];
+    sprintf(filename, "/tmp/libfuzzer.%d", getpid());
+
+    FILE *fp = fopen(filename, "wb");
+    if (!fp) {
+            return 0;
+    }
+    fwrite(data, size, 1, fp);
+    fclose(fp);
+
+    FILE *f = fopen(filename, "r");
+    Str s = Strfgetall(f);
+    wc_Str_conv_with_detect(s, &from, from, to);
+    if (s != NULL) {
+            Strfree(s);
+    }
+
+    unlink(filename);
+
+    free(new_str1);
+    free(new_str2);
+    return 0;
+}