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Diffstat (limited to 'ext/atom.lv2/atom-helpers.h')
| -rw-r--r-- | ext/atom.lv2/atom-helpers.h | 174 |
1 files changed, 0 insertions, 174 deletions
diff --git a/ext/atom.lv2/atom-helpers.h b/ext/atom.lv2/atom-helpers.h deleted file mode 100644 index 4e51c89..0000000 --- a/ext/atom.lv2/atom-helpers.h +++ /dev/null @@ -1,174 +0,0 @@ -/* - Copyright 2008-2011 David Robillard <http://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. -*/ - -/** - @file atom-helpers.h Helper functions for the LV2 Atom extension. - - These functions are provided for convenience only, use of them is not - required for supporting atoms. - - Note that these functions are all static inline which basically means: - do not take the address of these functions. -*/ - -#ifndef LV2_ATOM_HELPERS_H -#define LV2_ATOM_HELPERS_H - -#include <stdbool.h> -#include <stdint.h> -#include <stdio.h> -#include <string.h> - -#include "lv2/lv2plug.in/ns/ext/atom/atom.h" - -typedef LV2_Atom_Property* LV2_Thing_Iter; - -/** Get an iterator pointing to @c prop in some LV2_Thing */ -static inline LV2_Thing_Iter -lv2_thing_begin(const LV2_Thing* obj) -{ - return (LV2_Thing_Iter)(obj->properties); -} - -/** Return true iff @c iter has reached the end of @c thing */ -static inline bool -lv2_thing_iter_is_end(const LV2_Thing* obj, LV2_Thing_Iter iter) -{ - return (uint8_t*)iter >= ((uint8_t*)obj + sizeof(LV2_Atom) + obj->size); -} - -/** Return true iff @c l points to the same property as @c r */ -static inline bool -lv2_thing_iter_equals(const LV2_Thing_Iter l, const LV2_Thing_Iter r) -{ - return l == r; -} - -/** Return an iterator to the property following @c iter */ -static inline LV2_Thing_Iter -lv2_thing_iter_next(const LV2_Thing_Iter iter) -{ - return (LV2_Thing_Iter)((uint8_t*)iter - + sizeof(LV2_Atom_Property) - + lv2_atom_pad_size(iter->value.size)); -} - -/** Return the property pointed to by @c iter */ -static inline LV2_Atom_Property* -lv2_thing_iter_get(LV2_Thing_Iter iter) -{ - return (LV2_Atom_Property*)iter; -} - -/** - A macro for iterating over all properties of an Thing. - @param thing The thing to iterate over - @param iter The name of the iterator - - This macro is used similarly to a for loop (which it expands to), e.g.: - <pre> - LV2_THING_FOREACH(thing, i) { - LV2_Atom_Property* prop = lv2_thing_iter_get(i); - // Do things with prop here... - } - </pre> -*/ -#define LV2_THING_FOREACH(thing, iter) \ - for (LV2_Thing_Iter (iter) = lv2_thing_begin(thing); \ - !lv2_thing_iter_is_end(thing, (iter)); \ - (iter) = lv2_thing_iter_next(iter)) - -/** - Append a Property body to an Atom that contains properties (e.g. atom:Thing). - @param thing Pointer to the atom that contains the property to add. thing.size - must be valid, but thing.type is ignored. - @param key The key of the new property - @param value_type The type of the new value - @param value_size The size of the new value - @param value_body Pointer to the new value's data - @return a pointer to the new LV2_Atom_Property in @c body. - - This function will write the property body (not including an LV2_Thing - header) at lv2_atom_pad_size(body + size). Thus, it can be used with any - Atom type that contains headerless 32-bit aligned properties. -*/ -static inline LV2_Atom_Property* -lv2_thing_append(LV2_Thing* thing, - uint32_t key, - uint32_t value_type, - uint32_t value_size, - const void* value_body) -{ - thing->size = lv2_atom_pad_size(thing->size); - LV2_Atom_Property* prop = (LV2_Atom_Property*)( - (uint8_t*)thing + sizeof(LV2_Atom) + thing->size); - prop->key = key; - prop->value.type = value_type; - prop->value.size = value_size; - memcpy(prop->value.body, value_body, value_size); - thing->size += sizeof(LV2_Atom_Property) + value_size; - return prop; -} - -/** Return true iff @c atom is NULL */ -static inline bool -lv2_atom_is_null(LV2_Atom* atom) -{ - return !atom || (atom->type == 0 && atom->size == 0); -} - -/** A single entry in an Thing query. */ -typedef struct { - uint32_t key; /**< Key to query (input set by user) */ - const LV2_Atom** value; /**< Found value (output set by query function) */ -} LV2_Thing_Query; - -static const LV2_Thing_Query LV2_THING_QUERY_END = { 0, NULL }; - -/** - "Query" an thing, getting a pointer to the values for various keys. - - The value pointer of each item in @c query will be set to the location of - the corresponding value in @c thing. Every value pointer in @c query MUST - be initialised to NULL. This function reads @c thing in a single linear - sweep. By allocating @c query on the stack, things can be "queried" - quickly without allocating any memory. This function is realtime safe. -*/ -static inline int -lv2_thing_query(const LV2_Thing* thing, LV2_Thing_Query* query) -{ - int matches = 0; - int n_queries = 0; - - /* Count number of query keys so we can short-circuit when done */ - for (LV2_Thing_Query* q = query; q->key; ++q) - ++n_queries; - - LV2_THING_FOREACH(thing, o) { - const LV2_Atom_Property* prop = lv2_thing_iter_get(o); - for (LV2_Thing_Query* q = query; q->key; ++q) { - if (q->key == prop->key && !*q->value) { - *q->value = &prop->value; - if (++matches == n_queries) - return matches; - break; - } - } - } - return matches; -} - -#endif /* LV2_ATOM_HELPERS_H */ |