epub: Replace backend internals with libgepub

Replace the hand-rolled EPUB parsing with libgepub. This removes the
bundled minizip library, custom XML utilities, and temporary directory
extraction in favor of GepubDoc which handles archive access, metadata,
spine navigation, and table of contents. An epub:// URI scheme handler
serves resources directly from the archive without extracting to disk.
Search and night mode are stubbed as no-ops pending follow-up commits.

Assisted-by: OpenCode:claude-opus-4-6

1 files changed, 52 insertions, 0 deletions

diff --git a/libview/ev-web-view.c b/libview/ev-web-view.c
index 7c6c83f3..2fc795b8 100644
--- a/libview/ev-web-view.c
+++ b/libview/ev-web-view.c
@@ -29,6 +29,7 @@
 
 #include "ev-web-view.h"
 #include "ev-document-model.h"
+#include "ev-document.h"
 #include "ev-jobs.h"
 
  typedef enum {
@@ -130,12 +131,63 @@ ev_web_view_class_init (EvWebViewClass *klass)
 }
 
 static void
+epub_uri_scheme_request_cb (WebKitURISchemeRequest *request,
+                            gpointer               user_data)
+{
+	WebKitWebView *wv = webkit_uri_scheme_request_get_web_view (request);
+	EvWebView *webview = EV_WEB_VIEW (wv);
+	const gchar *path = webkit_uri_scheme_request_get_path (request);
+
+	if (!webview->document || !path) {
+		GError *error = g_error_new (G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
+		                             "Resource not found: %s", path ? path : "(null)");
+		webkit_uri_scheme_request_finish_error (request, error);
+		g_error_free (error);
+		return;
+	}
+
+	/* Strip leading slash from the path */
+	while (*path == '/')
+		path++;
+
+	GBytes *resource = ev_document_get_resource (webview->document, path);
+	gchar *mime = ev_document_get_resource_mime (webview->document, path);
+
+	if (!resource) {
+		GError *error = g_error_new (G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
+		                             "Resource not found: %s", path);
+		webkit_uri_scheme_request_finish_error (request, error);
+		g_error_free (error);
+		g_free (mime);
+		return;
+	}
+
+	gsize size = g_bytes_get_size (resource);
+	GInputStream *stream = g_memory_input_stream_new_from_bytes (resource);
+	webkit_uri_scheme_request_finish (request, stream, size,
+	                                  mime ? mime : "application/octet-stream");
+	g_object_unref (stream);
+	g_bytes_unref (resource);
+	g_free (mime);
+}
+
+static void
 ev_web_view_init (EvWebView *webview)
 {
+	static gboolean scheme_registered = FALSE;
+
 	gtk_widget_set_can_focus (GTK_WIDGET (webview), TRUE);
 
 	gtk_widget_set_has_window (GTK_WIDGET (webview), TRUE);
 
+	if (!scheme_registered) {
+		WebKitWebContext *context = webkit_web_context_get_default ();
+		webkit_web_context_register_uri_scheme (context, "epub",
+		                                        epub_uri_scheme_request_cb,
+		                                        NULL, NULL);
+		scheme_registered = TRUE;
+	}
+
 	webview->current_page = 0;
 
 	webview->search = g_new0(SearchParams, 1);