From a9ca0e4de36ff32fb4a28f1bdc74ef08dc3f1ca4 Mon Sep 17 00:00:00 2001
From: "Chang, Harry" <harry.chang@intel.com>
Date: Thu, 12 May 2022 02:15:07 +0000
Subject: [PATCH] Corpus generator: fix random char value of UTF-8.

fixes github issue #184
---
 util/ng_corpus_generator.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util/ng_corpus_generator.cpp b/util/ng_corpus_generator.cpp
index 145a0ab8..6c3f613d 100644
--- a/util/ng_corpus_generator.cpp
+++ b/util/ng_corpus_generator.cpp
@@ -476,14 +476,14 @@ void CorpusGeneratorUtf8::generateCorpus(vector<string> &data) {
  * that we've been asked for. */
 unichar CorpusGeneratorUtf8::getRandomChar() {
     u32 range = MAX_UNICODE + 1
-                - (UNICODE_SURROGATE_MAX + UNICODE_SURROGATE_MIN + 1);
+                - (UNICODE_SURROGATE_MAX - UNICODE_SURROGATE_MIN + 1);
     range = min(cProps.alphabetSize, range);
     assert(range);
 
     unichar c = 'a' + cProps.rand(0, range - 1);
 
     if (c >= UNICODE_SURROGATE_MIN) {
-        c =+ UNICODE_SURROGATE_MAX + 1;
+        c += UNICODE_SURROGATE_MAX - UNICODE_SURROGATE_MIN + 1;
     }
 
     return c % (MAX_UNICODE + 1);