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libs/ardour/lv2/lv2plug.in/ns/ext/urid/urid.h
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libs/ardour/lv2/lv2plug.in/ns/ext/urid/urid.h
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/*
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Copyright 2011 Gabriel M. Beddingfield <gabrbedd@gmail.com>
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Copyright 2008-2011 David Robillard <http://drobilla.net>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/**
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@file
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C header for the LV2 URID extension <http://lv2plug.in/ns/ext/urid>
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*/
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#ifndef LV2_URID_H
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#define LV2_URID_H
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#define LV2_URID_URI "http://lv2plug.in/ns/ext/urid"
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#define LV2_URID_MAP_URI LV2_URID_URI "#map"
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#define LV2_URID_UNMAP_URI LV2_URID_URI "#unmap"
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#include <stdint.h>
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/**
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Opaque pointer to host data for LV2_URID_Map.
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*/
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typedef void* LV2_URID_Map_Handle;
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/**
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Opaque pointer to host data for LV2_URID_Unmap.
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*/
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typedef void* LV2_URID_Unmap_Handle;
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/**
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URI mapped to an integer.
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*/
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typedef uint32_t LV2_URID;
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/**
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URI Map (http://lv2plug.in/ns/ext/urid#map).
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*/
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typedef struct {
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/**
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Opaque pointer to host data.
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This MUST be passed to map_uri() whenever it is called.
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Otherwise, it must not be interpreted in any way.
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*/
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LV2_URID_Map_Handle handle;
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/**
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Get the numeric ID of a URI.
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If the ID does not already exist, it will be created.
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This function is referentially transparent; any number of calls with the
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same arguments is guaranteed to return the same value over the life of a
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plugin instance. Note, however, that several URIs MAY resolve to the
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same ID if the host considers those URIs equivalent.
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This function is not necessarily very fast or RT-safe: plugins SHOULD
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cache any IDs they might need in performance critical situations.
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The return value 0 is reserved and indicates that an ID for that URI
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could not be created for whatever reason. However, hosts SHOULD NOT
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return 0 from this function in non-exceptional circumstances (i.e. the
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URI map SHOULD be dynamic).
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@param handle Must be the callback_data member of this struct.
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@param uri The URI to be mapped to an integer ID.
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*/
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LV2_URID (*map)(LV2_URID_Map_Handle handle,
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const char* uri);
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} LV2_URID_Map;
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/**
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URI Unmap (http://lv2plug.in/ns/ext/urid#unmap).
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*/
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typedef struct {
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/**
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Opaque pointer to host data.
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This MUST be passed to unmap() whenever it is called.
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Otherwise, it must not be interpreted in any way.
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*/
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LV2_URID_Unmap_Handle handle;
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/**
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Get the URI for a previously mapped numeric ID.
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Returns NULL if @c urid is not yet mapped. Otherwise, the corresponding
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URI is returned in a canonical form. This MAY not be the exact same
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string that was originally passed to LV2_URID_Map::map(), but it MUST be
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an identical URI according to the URI syntax specification (RFC3986). A
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non-NULL return for a given @c urid will always be the same for the life
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of the plugin. Plugins that intend to perform string comparison on
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unmapped URIs SHOULD first canonicalise URI strings with a call to
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map_uri() followed by a call to unmap_uri().
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@param handle Must be the callback_data member of this struct.
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@param urid The ID to be mapped back to the URI string.
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*/
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const char* (*unmap)(LV2_URID_Unmap_Handle handle,
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LV2_URID urid);
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} LV2_URID_Unmap;
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#endif /* LV2_URID_H */
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