From 437bbf937bf78d100180407e1e92dd881f170f63 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Wed, 4 Oct 2023 08:20:40 -0400
Subject: [PATCH] src/svgtiny.c: add svgtiny_parse_style_element() function and
 use it

The new function parses the contents of a <style> element. We add a
call to it in svgtiny_preparse_styles() where previously a placeholder
was left.
---
 src/svgtiny.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)

diff --git a/src/svgtiny.c b/src/svgtiny.c
index 8cb1eff..09adedc 100644
--- a/src/svgtiny.c
+++ b/src/svgtiny.c
@@ -40,6 +40,8 @@
 #define degToRad(angleInDegrees) ((angleInDegrees) * M_PI / 180.0)
 #define radToDeg(angleInRadians) ((angleInRadians) * 180.0 / M_PI)
 
+static svgtiny_code svgtiny_parse_style_element(dom_element *style,
+		struct svgtiny_parse_state state);
 static svgtiny_code svgtiny_preparse_styles(dom_element *svg,
 		struct svgtiny_parse_state state);
 static svgtiny_code svgtiny_parse_svg(dom_element *svg,
@@ -761,6 +763,94 @@ cleanup:
 	return code;
 }
 
+
+/**
+ * Parse a single <style> element, appending the result to the CSS
+ * select context within the given parser state.
+ */
+svgtiny_code svgtiny_parse_style_element(dom_element *style,
+		struct svgtiny_parse_state state)
+{
+	css_stylesheet *sheet;
+	css_stylesheet_params params;
+	css_error code;
+	dom_exception exc;
+
+	params.params_version = CSS_STYLESHEET_PARAMS_VERSION_1;
+	params.level = CSS_LEVEL_DEFAULT;
+	params.charset = NULL;
+	params.url = "";
+	params.title = NULL;
+	params.allow_quirks = false;
+	params.inline_style = false;
+	params.resolve = svgtiny_resolve_url;
+	params.resolve_pw = NULL;
+	params.import = NULL;
+	params.import_pw = NULL;
+	params.color = NULL;
+	params.color_pw = NULL;
+	params.font = NULL;
+	params.font_pw = NULL;
+
+	code = css_stylesheet_create(&params, &sheet);
+	if (code != CSS_OK) {
+		return svgtiny_LIBCSS_ERROR;
+	}
+
+	/* Parse the style element's "media" attribute if it has
+	   one. We don't do anything with it right now. */
+	dom_string *media_attr;
+	exc = dom_element_get_attribute(style, state.interned_media,
+					&media_attr);
+	if (exc != DOM_NO_ERR) {
+		css_stylesheet_destroy(sheet);
+		return svgtiny_LIBDOM_ERROR;
+	}
+
+	if (media_attr) {
+		/* Here's where we'd actually change the media type if
+		   we were going to use it */
+		dom_string_unref(media_attr);
+	}
+
+	dom_string *data;
+	dom_node_get_text_content(style, &data);
+	if (data == NULL) {
+		/* Empty stylesheet? That's fine. */
+		css_stylesheet_destroy(sheet);
+		return svgtiny_OK;
+	}
+
+	code = css_stylesheet_append_data(sheet,
+					  (uint8_t *)dom_string_data(data),
+					  dom_string_byte_length(data));
+	if (code != CSS_OK && code != CSS_NEEDDATA) {
+		dom_string_unref(data);
+		css_stylesheet_destroy(sheet);
+		return svgtiny_LIBCSS_ERROR;
+	}
+
+	code = css_stylesheet_data_done(sheet);
+	if (code != CSS_OK) {
+		dom_string_unref(data);
+		css_stylesheet_destroy(sheet);
+		return svgtiny_LIBCSS_ERROR;
+	}
+
+	code = css_select_ctx_append_sheet(state.select_ctx,
+		sheet,
+		CSS_ORIGIN_AUTHOR,
+		NULL);
+	if (code != CSS_OK) {
+		dom_string_unref(data);
+		return svgtiny_LIBCSS_ERROR;
+	}
+
+	dom_string_unref(data);
+	return svgtiny_OK;
+}
+
+
 /**
  * Parse all <style> elements within a root <svg> element. This
  * should be called before svgtiny_parse_svg() because that function
@@ -803,6 +893,8 @@ svgtiny_code svgtiny_preparse_styles(dom_element *svg,
 			if (dom_string_caseless_isequal(state.interned_style,
 							nodename)) {
 				/* We have a <style> element, parse it */
+				code = svgtiny_parse_style_element(child,
+								state);
 			}
 
 
-- 
2.44.2