1 files changed, 121 insertions, 0 deletions
diff --git a/include/lv2/uri-map/uri-map.h b/include/lv2/uri-map/uri-map.h
new file mode 100644
index 0000000..47cde1c
--- /dev/null
+++ b/include/lv2/uri-map/uri-map.h
@@ -0,0 +1,121 @@
+/*
+  Copyright 2008-2016 David Robillard <d@drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#ifndef LV2_URI_MAP_H
+#define LV2_URI_MAP_H
+
+/**
+   @defgroup uri-map URI Map
+   @ingroup lv2
+
+   A feature for mapping URIs to integers.
+
+   This extension defines a simple mechanism for plugins to map URIs to
+   integers, usually for performance reasons (e.g. processing events typed by
+   URIs in real time). The expected use case is for plugins to map URIs to
+   integers for things they 'understand' at instantiation time, and store those
+   values for use in the audio thread without doing any string comparison.
+   This allows the extensibility of RDF with the performance of integers (or
+   centrally defined enumerations).
+
+   See <http://lv2plug.in/ns/ext/uri-map> for details.
+
+   @{
+*/
+
+// clang-format off
+
+#define LV2_URI_MAP_URI    "http://lv2plug.in/ns/ext/uri-map"  ///< http://lv2plug.in/ns/ext/uri-map
+#define LV2_URI_MAP_PREFIX LV2_URI_MAP_URI "#"                 ///< http://lv2plug.in/ns/ext/uri-map#
+
+// clang-format on
+
+#include "lv2/core/attributes.h"
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+LV2_DISABLE_DEPRECATION_WARNINGS
+
+/**
+   Opaque pointer to host data.
+*/
+LV2_DEPRECATED
+typedef void* LV2_URI_Map_Callback_Data;
+
+/**
+   URI Map Feature.
+
+   To support this feature the host must pass an LV2_Feature struct to the
+   plugin's instantiate method with URI "http://lv2plug.in/ns/ext/uri-map"
+   and data pointed to an instance of this struct.
+*/
+LV2_DEPRECATED
+typedef struct {
+  /**
+     Opaque pointer to host data.
+
+     The plugin MUST pass this to any call to functions in this struct.
+     Otherwise, it must not be interpreted in any way.
+  */
+  LV2_URI_Map_Callback_Data callback_data;
+
+  /**
+     Get the numeric ID of a URI from the host.
+
+     @param callback_data Must be the callback_data member of this struct.
+     @param map The 'context' of this URI. Certain extensions may define a
+     URI that must be passed here with certain restrictions on the return
+     value (e.g. limited range). This value may be NULL if the plugin needs
+     an ID for a URI in general. Extensions SHOULD NOT define a context
+     unless there is a specific need to do so, e.g. to restrict the range of
+     the returned value.
+     @param uri The URI to be mapped to an integer ID.
+
+     This function is referentially transparent; any number of calls with the
+     same arguments is guaranteed to return the same value over the life of a
+     plugin instance (though the same URI may return different values with a
+     different map parameter). However, this function is not necessarily very
+     fast: plugins SHOULD cache any IDs they might need in performance
+     critical situations.
+
+     The return value 0 is reserved and indicates that an ID for that URI
+     could not be created for whatever reason. Extensions MAY define more
+     precisely what this means in a certain context, but in general plugins
+     SHOULD handle this situation as gracefully as possible. However, hosts
+     SHOULD NOT return 0 from this function in non-exceptional circumstances
+     (e.g. the URI map SHOULD be dynamic). Hosts that statically support only
+     a fixed set of URIs should not expect plugins to function correctly.
+  */
+  uint32_t (*uri_to_id)(LV2_URI_Map_Callback_Data callback_data,
+                        const char*               map,
+                        const char*               uri);
+} LV2_URI_Map_Feature;
+
+LV2_RESTORE_WARNINGS
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+/**
+   @}
+*/
+
+#endif /* LV2_URI_MAP_H */