input/cache: first draft of the file cache

src/decoder/Bridge.cxx

@@ -31,6 +31,8 @@
 #include "Log.hxx"
 #include "input/InputStream.hxx"
 #include "input/LocalOpen.hxx"
+#include "input/cache/Manager.hxx"
+#include "input/cache/Stream.hxx"
 #include "fs/Path.hxx"
 #include "util/ConstBuffer.hxx"
 #include "util/StringBuffer.hxx"
@@ -52,8 +54,18 @@ DecoderBridge::~DecoderBridge() noexcept
 }
 
 InputStreamPtr
-DecoderBridge::OpenLocal(Path path_fs)
+DecoderBridge::OpenLocal(Path path_fs, const char *uri_utf8)
 {
+	if (dc.input_cache != nullptr) {
+		auto lease = dc.input_cache->Get(uri_utf8, true);
+		if (lease) {
+			auto is = std::make_unique<CacheInputStream>(std::move(lease),
+								     dc.mutex);
+			is->SetHandler(&dc);
+			return is;
+		}
+	}
+
 	return OpenLocalInputStream(path_fs, dc.mutex);
 }