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-/* lv2_event_helpers.h - Helper functions for the LV2 events extension.
- *
- * Copyright (C) 2008-2009 David Robillard <http://drobilla.net>
- *
- * This header is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published
- * by the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This header is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- * License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this header; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 01222-1307 USA
- */
-
-#ifndef LV2_EVENT_HELPERS_H
-#define LV2_EVENT_HELPERS_H
-
-#include <stdint.h>
-#include <stdbool.h>
-#include <string.h>
-#include <stdlib.h>
-#include <assert.h>
-#include "lv2/lv2plug.in/ns/ext/event/event.h"
-
-/** @file
- * Helper functions for the LV2 Event extension
- * <http://lv2plug.in/ns/ext/event>.
- *
- * These functions are provided for convenience only, use of them is not
- * required for supporting lv2ev (i.e. the events extension is defined by the
- * raw buffer format described in lv2_event.h and NOT by this API).
- *
- * Note that these functions are all static inline which basically means:
- * do not take the address of these functions. */
-
-
-/** Pad a size to 64 bits (for event sizes) */
-static inline uint16_t
-lv2_event_pad_size(uint16_t size)
-{
- return (size + 7) & (~7);
-}
-
-
-/** Initialize (empty, reset..) an existing event buffer.
- * The contents of buf are ignored entirely and overwritten, except capacity
- * which is unmodified. */
-static inline void
-lv2_event_buffer_reset(LV2_Event_Buffer* buf,
- uint16_t stamp_type,
- uint8_t *data)
-{
- buf->data = data;
- buf->header_size = sizeof(LV2_Event_Buffer);
- buf->stamp_type = stamp_type;
- buf->event_count = 0;
- buf->size = 0;
-}
-
-
-/** Allocate a new, empty event buffer. */
-static inline LV2_Event_Buffer*
-lv2_event_buffer_new(uint32_t capacity, uint16_t stamp_type)
-{
- const size_t size = sizeof(LV2_Event_Buffer) + capacity;
- LV2_Event_Buffer* buf = (LV2_Event_Buffer*)malloc(size);
- if (buf != NULL) {
- buf->capacity = capacity;
- lv2_event_buffer_reset(buf, stamp_type, (uint8_t *)(buf + 1));
- return buf;
- } else {
- return NULL;
- }
-}
-
-
-/** An iterator over an LV2_Event_Buffer.
- *
- * Multiple simultaneous read iterators over a single buffer is fine,
- * but changing the buffer invalidates all iterators (e.g. RW Lock). */
-typedef struct {
- LV2_Event_Buffer* buf;
- uint32_t offset;
-} LV2_Event_Iterator;
-
-
-/** Reset an iterator to point to the start of @a buf.
- * @return True if @a iter is valid, otherwise false (buffer is empty) */
-static inline bool
-lv2_event_begin(LV2_Event_Iterator* iter,
- LV2_Event_Buffer* buf)
-{
- iter->buf = buf;
- iter->offset = 0;
- return (buf->size > 0);
-}
-
-
-/** Check if @a iter is valid.
- * @return True if @a iter is valid, otherwise false (past end of buffer) */
-static inline bool
-lv2_event_is_valid(LV2_Event_Iterator* iter)
-{
- return (iter->offset < iter->buf->size);
-}
-
-
-/** Advance @a iter forward one event.
- * @a iter must be valid.
- * @return True if @a iter is valid, otherwise false (reached end of buffer) */
-static inline bool
-lv2_event_increment(LV2_Event_Iterator* iter)
-{
- assert(lv2_event_is_valid(iter));
-
- LV2_Event* const ev = (LV2_Event*)(
- (uint8_t*)iter->buf->data + iter->offset);
-
- iter->offset += lv2_event_pad_size(sizeof(LV2_Event) + ev->size);
-
- return true;
-}
-
-
-/** Dereference an event iterator (get the event currently pointed at).
- * @a iter must be valid.
- * @a data if non-NULL, will be set to point to the contents of the event
- * returned.
- * @return A Pointer to the event @a iter is currently pointing at, or NULL
- * if the end of the buffer is reached (in which case @a data is
- * also set to NULL). */
-static inline LV2_Event*
-lv2_event_get(LV2_Event_Iterator* iter,
- uint8_t** data)
-{
- assert(lv2_event_is_valid(iter));
-
- LV2_Event* const ev = (LV2_Event*)(
- (uint8_t*)iter->buf->data + iter->offset);
-
- if (data)
- *data = (uint8_t*)ev + sizeof(LV2_Event);
-
- return ev;
-}
-
-
-/** Write an event at @a iter.
- * The event (if any) pointed to by @a iter will be overwritten, and @a iter
- * incremented to point to the following event (i.e. several calls to this
- * function can be done in sequence without twiddling iter in-between).
- * @return True if event was written, otherwise false (buffer is full). */
-static inline bool
-lv2_event_write(LV2_Event_Iterator* iter,
- uint32_t frames,
- uint32_t subframes,
- uint16_t type,
- uint16_t size,
- const uint8_t* data)
-{
- if (iter->buf->capacity - iter->buf->size < sizeof(LV2_Event) + size)
- return false;
-
- LV2_Event* const ev = (LV2_Event*)(
- (uint8_t*)iter->buf->data + iter->offset);
-
- ev->frames = frames;
- ev->subframes = subframes;
- ev->type = type;
- ev->size = size;
- memcpy((uint8_t*)ev + sizeof(LV2_Event), data, size);
- ++iter->buf->event_count;
-
- size = lv2_event_pad_size(sizeof(LV2_Event) + size);
- iter->buf->size += size;
- iter->offset += size;
-
- return true;
-}
-
-
-/** Reserve space for an event in the buffer and return a pointer to
- the memory where the caller can write the event data, or NULL if there
- is not enough room in the buffer. */
-static inline uint8_t*
-lv2_event_reserve(LV2_Event_Iterator* iter,
- uint32_t frames,
- uint32_t subframes,
- uint16_t type,
- uint16_t size)
-{
- size = lv2_event_pad_size(size);
- if (iter->buf->capacity - iter->buf->size < sizeof(LV2_Event) + size)
- return NULL;
-
- LV2_Event* const ev = (LV2_Event*)((uint8_t*)iter->buf->data +
- iter->offset);
-
- ev->frames = frames;
- ev->subframes = subframes;
- ev->type = type;
- ev->size = size;
- ++iter->buf->event_count;
-
- size = lv2_event_pad_size(sizeof(LV2_Event) + size);
- iter->buf->size += size;
- iter->offset += size;
-
- return (uint8_t*)ev + sizeof(LV2_Event);
-}
-
-
-/** Write an event at @a iter.
- * The event (if any) pointed to by @a iter will be overwritten, and @a iter
- * incremented to point to the following event (i.e. several calls to this
- * function can be done in sequence without twiddling iter in-between).
- * @return True if event was written, otherwise false (buffer is full). */
-static inline bool
-lv2_event_write_event(LV2_Event_Iterator* iter,
- const LV2_Event* ev,
- const uint8_t* data)
-{
- if (iter->buf->capacity - iter->buf->size < sizeof(LV2_Event) + ev->size)
- return false;
-
- LV2_Event* const write_ev = (LV2_Event*)(
- (uint8_t*)iter->buf->data + iter->offset);
-
- *write_ev = *ev;
- memcpy((uint8_t*)write_ev + sizeof(LV2_Event), data, ev->size);
- ++iter->buf->event_count;
-
- const uint16_t size = lv2_event_pad_size(sizeof(LV2_Event) + ev->size);
- iter->buf->size += size;
- iter->offset += size;
-
- return true;
-}
-
-#endif /* LV2_EVENT_HELPERS_H */
-
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