From 4a2f50f00529aa0894486a099b721826add9205b Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 28 Apr 2021 05:08:42 +0200
Subject: Make tags case insensitive

---
 src/HtmlParser.c | 32 ++++++++++++++++++++++----------
 1 file changed, 22 insertions(+), 10 deletions(-)

diff --git a/src/HtmlParser.c b/src/HtmlParser.c
index 9df3983..f85a633 100644
--- a/src/HtmlParser.c
+++ b/src/HtmlParser.c
@@ -20,13 +20,27 @@ static HtmlStringView void_tags[] = {
     {"source", 6},
     {"track", 5},
     {"wbr", 3},
+    {"xml", 3},
     {NULL, 0}
 };
 
 static HtmlStringView script_tag = {"script", 6};
 
-static int string_view_equals(HtmlStringView *self, HtmlStringView *other) {
-    return self->size == other->size && memcmp(self->data, other->data, self->size) == 0;
+static char to_lower(char c) {
+    if(c >= 'A' && c <= 'Z')
+        return c + 32;
+    else
+        return c;
+}
+
+static int string_view_equals_case_insensitive(HtmlStringView *self, HtmlStringView *other) {
+    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]))
+            return 0;
+    }
+    return 1;
 }
 
 static int is_whitespace(int c) {
@@ -71,9 +85,7 @@ static void strip(char *str, size_t size, char **output_str, size_t *output_size
 static void html_string_view_to_lowercase(HtmlStringView *string_view) {
     size_t i = 0;
     for(; i < string_view->size; ++i) {
-        char c = string_view->data[i];
-        if(c >= 'A' && c <= 'Z')
-            string_view->data[i] += 32;
+        string_view->data[i] = to_lower(string_view->data[i]);
     }
 }
 
@@ -83,7 +95,7 @@ static int is_void_tag(HtmlStringView *tag_name) {
     if(tag_name->size > 0 && tag_name->data[0] == '!')
         return 1;
     while(tag_iter->data) {
-        if(string_view_equals(tag_name, tag_iter))
+        if(string_view_equals_case_insensitive(tag_name, tag_iter))
             return 1;
         ++tag_iter;
     }
@@ -352,7 +364,7 @@ static void html_parser_parse_tag_start(HtmlParser *self) {
             if(tag_name_found) {
                 /* attribute name */
                 self->attribute_key = identifier;
-                html_string_view_to_lowercase(&self->attribute_key);
+                /*html_string_view_to_lowercase(&self->attribute_key);*/
                 self->attribute_value.data = NULL;
                 self->attribute_value.size = 0;
 
@@ -375,7 +387,7 @@ static void html_parser_parse_tag_start(HtmlParser *self) {
                 /* tag name */
                 HtmlStringView prev_tag_name = self->tag_name;
                 self->tag_name = identifier;
-                html_string_view_to_lowercase(&self->tag_name);
+                /*html_string_view_to_lowercase(&self->tag_name);*/
                 tag_name_found = 1;
                 if(self->tag_name.size == 3 && memcmp(self->tag_name.data, "!--", 3) == 0) {
                     html_parser_goto_comment_end(self);
@@ -386,7 +398,7 @@ static void html_parser_parse_tag_start(HtmlParser *self) {
                     self->tag_before_void_tag = prev_tag_name;
                 } else {
                     html_parser_try_append_unclosed_tag(self, self->tag_name.data, self->tag_name.size);
-                    self->inside_script_tag = string_view_equals(&self->tag_name, &script_tag);
+                    self->inside_script_tag = string_view_equals_case_insensitive(&self->tag_name, &script_tag);
                 }
                 self->parse_callback(self, HTML_PARSE_TAG_START, self->callback_userdata);
             }
@@ -429,7 +441,7 @@ static void html_parser_parse_tag_end(HtmlParser *self) {
 
             found_start_tag_index = -1;
             for(i = self->unclosed_tags_offset - 1; i >= 0; --i) {
-                if(string_view_equals(&self->unclosed_tags[i], &tag_end_name)) {
+                if(string_view_equals_case_insensitive(&self->unclosed_tags[i], &tag_end_name)) {
                     found_start_tag_index = i;
                     break;
                 }
-- 
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