From b96dd619fe0bc09f31da8bf23f195a2a9916b839 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 2 Nov 2021 11:56:23 +0200
Subject: [PATCH] Add a function to detect image signature without creating a
 loader

---
 source/graphics/imageloader.cpp | 9 +++++++++
 source/graphics/imageloader.h   | 1 +
 2 files changed, 10 insertions(+)

diff --git a/source/graphics/imageloader.cpp b/source/graphics/imageloader.cpp
index d2d3ef9..859a34c 100644
--- a/source/graphics/imageloader.cpp
+++ b/source/graphics/imageloader.cpp
@@ -32,6 +32,15 @@ ImageLoader::~ImageLoader()
 	delete source;
 }
 
+bool ImageLoader::detect_signature(const std::string &sig)
+{
+	Registry &registry = get_registry();
+	for(list<RegisterBase *>::const_iterator i=registry.loaders.begin(); i!=registry.loaders.end(); ++i)
+		if((*i)->detect(sig))
+			return true;
+	return false;
+}
+
 ImageLoader *ImageLoader::open_file(const string &fn)
 {
 	try
diff --git a/source/graphics/imageloader.h b/source/graphics/imageloader.h
index 1ad6cc8..fbfd4d6 100644
--- a/source/graphics/imageloader.h
+++ b/source/graphics/imageloader.h
@@ -71,6 +71,7 @@ protected:
 public:
 	virtual ~ImageLoader();
 
+	static bool detect_signature(const std::string &);
 	static ImageLoader *open_file(const std::string &);
 	static ImageLoader *open_io(IO::Seekable &);
 
-- 
2.43.0