Move ns to lv2/ns so repository top level can be used as an include dir directly.

1 files changed, 174 insertions, 0 deletions

diff --git a/lv2/ns/ext/atom/atom-helpers.h b/lv2/ns/ext/atom/atom-helpers.h
new file mode 100644
index 0000000..4e51c89
--- /dev/null
+++ b/lv2/ns/ext/atom/atom-helpers.h
@@ -0,0 +1,174 @@
+/*
+  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 */