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140 lines
3.7 KiB
C
140 lines
3.7 KiB
C
/* Simple Plugin API
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* Copyright (C) 2017 Wim Taymans <wim.taymans@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __SPA_POD_ITER_H__
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#define __SPA_POD_ITER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdarg.h>
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#include <spa/defs.h>
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#include <spa/pod-utils.h>
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struct spa_pod_iter {
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const void *data;
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uint32_t size;
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uint32_t offset;
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};
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static inline void spa_pod_iter_contents(struct spa_pod_iter *iter, const void *data, uint32_t size)
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{
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iter->data = data;
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iter->size = size;
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iter->offset = 0;
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}
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static inline bool spa_pod_iter_struct(struct spa_pod_iter *iter, const void *data, uint32_t size)
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{
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if (data == NULL || size < 8 || SPA_POD_SIZE(data) > size
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|| SPA_POD_TYPE(data) != SPA_POD_TYPE_STRUCT)
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return false;
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spa_pod_iter_contents(iter, SPA_POD_CONTENTS(struct spa_pod_struct, data),
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SPA_POD_CONTENTS_SIZE(struct spa_pod_struct, data));
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return true;
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}
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static inline bool spa_pod_iter_object(struct spa_pod_iter *iter, const void *data, uint32_t size)
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{
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if (data == NULL || SPA_POD_SIZE(data) > size || SPA_POD_TYPE(data) != SPA_POD_TYPE_OBJECT)
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return false;
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spa_pod_iter_contents(iter, SPA_POD_CONTENTS(struct spa_pod_object, data),
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SPA_POD_CONTENTS_SIZE(struct spa_pod_object, data));
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return true;
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}
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static inline bool spa_pod_iter_pod(struct spa_pod_iter *iter, struct spa_pod *pod)
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{
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void *data;
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uint32_t size;
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switch (SPA_POD_TYPE(pod)) {
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case SPA_POD_TYPE_STRUCT:
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data = SPA_POD_CONTENTS(struct spa_pod_struct, pod);
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size = SPA_POD_CONTENTS_SIZE(struct spa_pod_struct, pod);
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break;
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case SPA_POD_TYPE_OBJECT:
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data = SPA_POD_CONTENTS(struct spa_pod_object, pod);
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size = SPA_POD_CONTENTS_SIZE(struct spa_pod_object, pod);
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break;
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default:
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spa_pod_iter_contents(iter, NULL, 0);
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return false;
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}
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spa_pod_iter_contents(iter, data, size);
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return true;
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}
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static inline bool spa_pod_iter_has_next(struct spa_pod_iter *iter)
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{
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return (iter->offset + 8 <= iter->size &&
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SPA_POD_SIZE(SPA_MEMBER(iter->data, iter->offset, struct spa_pod)) <= iter->size);
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}
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static inline struct spa_pod *spa_pod_iter_next(struct spa_pod_iter *iter)
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{
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struct spa_pod *res = SPA_MEMBER(iter->data, iter->offset, struct spa_pod);
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iter->offset += SPA_ROUND_UP_N(SPA_POD_SIZE(res), 8);
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return res;
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}
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static inline struct spa_pod *spa_pod_iter_first(struct spa_pod_iter *iter, struct spa_pod *pod)
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{
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if (!spa_pod_iter_pod(iter, pod) || !spa_pod_iter_has_next(iter))
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return NULL;
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return spa_pod_iter_next(iter);
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}
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static inline bool spa_pod_iter_getv(struct spa_pod_iter *iter, uint32_t type, va_list args)
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{
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bool res = true;
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while (type && (res = spa_pod_iter_has_next(iter))) {
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struct spa_pod *pod = spa_pod_iter_next(iter);
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SPA_POD_COLLECT(pod, type, args, error);
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type = va_arg(args, uint32_t);
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}
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return res;
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error:
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return false;
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}
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static inline bool spa_pod_iter_get(struct spa_pod_iter *iter, uint32_t type, ...)
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{
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va_list args;
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bool res;
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va_start(args, type);
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res = spa_pod_iter_getv(iter, type, args);
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va_end(args);
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return res;
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}
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* __SPA_POD_H__ */
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