From 8d40850ffd52100aa51f9dc7814cc7b334381c32 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Mon, 19 Jul 2021 18:25:31 +0200
Subject: Fix script tag not getting closed until the end

---
 include/HtmlParser.h |  2 ++
 src/HtmlParser.c     | 31 +++++++++++++++++++++++--------
 2 files changed, 25 insertions(+), 8 deletions(-)

diff --git a/include/HtmlParser.h b/include/HtmlParser.h
index 5c1f4c1..1e23d0d 100644
--- a/include/HtmlParser.h
+++ b/include/HtmlParser.h
@@ -56,10 +56,12 @@ struct HtmlParser {
 
 /*
     Returns the value returned from |parse_callback|. 0 meaning success.
+    Input text is expected to be in utf8 and may or may not have UTF8-BOM.
     Note: HTML_PARSE_TAG_START is guaranteed to be called for a tag before HTML_PARSE_TAG_END.
     Note: HTML_PARSE_TEXT may be called multiple times for a tag. For example if a tag has multiple text items split between child tags
         like this: <div>hello<h1>text</h1>world</div>.
         In this case, HTML_PARSE_TEXT will be called twice for the div tag. First with "hello" and then with "world".
+    This function does 0 dynamic memory allocations.
 */
 int html_parser_parse(const char *html_source, size_t len, HtmlParseCallback parse_callback, void *userdata);
 
diff --git a/src/HtmlParser.c b/src/HtmlParser.c
index a760f98..8a595ac 100644
--- a/src/HtmlParser.c
+++ b/src/HtmlParser.c
@@ -26,9 +26,9 @@ static HtmlStringView void_tags[] = {
 
 static HtmlStringView script_tag = {"script", 6};
 
-static char to_lower(char c) {
-    if(c >= 'A' && c <= 'Z')
-        return c + 32;
+static char to_upper(char c) {
+    if(c >= 'a' && c <= 'z')
+        return c - 32;
     else
         return c;
 }
@@ -37,7 +37,7 @@ static int string_view_equals_case_insensitive(HtmlStringView *self, HtmlStringV
     size_t i = 0;
     if(self->size != other->size) return 0;
     for(; i < self->size; ++i) {
-        if(to_lower(self->data[i]) != to_lower(other->data[i]))
+        if(to_upper(self->data[i]) != to_upper(other->data[i]))
             return 0;
     }
     return 1;
@@ -103,6 +103,12 @@ static int is_void_tag(HtmlStringView *tag_name) {
 }
 
 static void html_parser_init(HtmlParser *self, const char *html_source, size_t len, HtmlParseCallback parse_callback, void *userdata) {
+    /* Utf8 BOM */
+    if(len >= 3 && memcmp(html_source, "\xef\xbb\xbf", 3) == 0) {
+        html_source += 3;
+        len -= 3;
+    }
+
     self->source = html_source;
     self->source_len = len;
     self->parse_callback = parse_callback;
@@ -268,6 +274,7 @@ static void html_parser_goto_end_of_js_string(HtmlParser *self, char quote_symbo
 }
 
 static int html_parser_goto_script_end_tag(HtmlParser *self) {
+    int res = 0;
     self->text.data = self->source + self->offset;
     self->text.size = 0;
     for(;;) {
@@ -300,10 +307,18 @@ static int html_parser_goto_script_end_tag(HtmlParser *self) {
         }
     }
 
-    if(self->text_stripped.size > 0)
-        return self->parse_callback(self, HTML_PARSE_JAVASCRIPT_CODE, self->callback_userdata);
-    else
-        return 0;
+    if(self->text_stripped.size > 0) {
+        res = self->parse_callback(self, HTML_PARSE_JAVASCRIPT_CODE, self->callback_userdata);
+        if(res != 0)
+            return res;
+    }
+
+    res = self->parse_callback(self, HTML_PARSE_TAG_END, self->callback_userdata);
+    if(res != 0)
+        return res;
+
+    html_parser_try_pop_unclosed_tag(self);
+    return res;
 }
 
 static void html_parser_goto_comment_end(HtmlParser *self) {
-- 
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