iter.h

Go to the documentation of this file.

/* Simple Plugin API
 *
 * Copyright © 2018 Wim Taymans
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
 
#ifndef SPA_POD_ITER_H
#define SPA_POD_ITER_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <errno.h>
#include <sys/types.h>
 
#include <spa/pod/pod.h>
 
struct spa_pod_frame {
        struct spa_pod pod;
        struct spa_pod_frame *parent;
        uint32_t offset;
        uint32_t flags;
};
 
/* static */ inline bool spa_pod_is_inside(const void *pod, uint32_t size, const void *iter)
{
        return SPA_POD_BODY(iter) <= SPA_PTROFF(pod, size, void) &&
                SPA_PTROFF(iter, SPA_POD_SIZE(iter), void) <= SPA_PTROFF(pod, size, void);
}
 
/* static */ inline void *spa_pod_next(const void *iter)
{
        return SPA_PTROFF(iter, SPA_ROUND_UP_N(SPA_POD_SIZE(iter), 8), void);
}
 
/* static */ inline struct spa_pod_prop *spa_pod_prop_first(const struct spa_pod_object_body *body)
{
        return SPA_PTROFF(body, sizeof(struct spa_pod_object_body), struct spa_pod_prop);
}
 
/* static */ inline bool spa_pod_prop_is_inside(const struct spa_pod_object_body *body,
                uint32_t size, const struct spa_pod_prop *iter)
{
        return SPA_POD_CONTENTS(struct spa_pod_prop, iter) <= SPA_PTROFF(body, size, void) &&
                SPA_PTROFF(iter, SPA_POD_PROP_SIZE(iter), void) <= SPA_PTROFF(body, size, void);
}
 
/* static */ inline struct spa_pod_prop *spa_pod_prop_next(const struct spa_pod_prop *iter)
{
        return SPA_PTROFF(iter, SPA_ROUND_UP_N(SPA_POD_PROP_SIZE(iter), 8), struct spa_pod_prop);
}
 
/* static */ inline struct spa_pod_control *spa_pod_control_first(const struct spa_pod_sequence_body *body)
{
        return SPA_PTROFF(body, sizeof(struct spa_pod_sequence_body), struct spa_pod_control);
}
 
/* static */ inline bool spa_pod_control_is_inside(const struct spa_pod_sequence_body *body,
                uint32_t size, const struct spa_pod_control *iter)
{
        return SPA_POD_CONTENTS(struct spa_pod_control, iter) <= SPA_PTROFF(body, size, void) &&
                SPA_PTROFF(iter, SPA_POD_CONTROL_SIZE(iter), void) <= SPA_PTROFF(body, size, void);
}
 
/* static */ inline struct spa_pod_control *spa_pod_control_next(const struct spa_pod_control *iter)
{
        return SPA_PTROFF(iter, SPA_ROUND_UP_N(SPA_POD_CONTROL_SIZE(iter), 8), struct spa_pod_control);
}
 
#define SPA_POD_ARRAY_BODY_FOREACH(body, _size, iter)                                                   \
        for ((iter) = (__typeof__(iter))SPA_PTROFF((body), sizeof(struct spa_pod_array_body), void);    \
             (iter) < (__typeof__(iter))SPA_PTROFF((body), (_size), void);                              \
             (iter) = (__typeof__(iter))SPA_PTROFF((iter), (body)->child.size, void))
 
#define SPA_POD_ARRAY_FOREACH(obj, iter)                                                        \
        SPA_POD_ARRAY_BODY_FOREACH(&(obj)->body, SPA_POD_BODY_SIZE(obj), iter)
 
#define SPA_POD_CHOICE_BODY_FOREACH(body, _size, iter)                                                  \
        for ((iter) = (__typeof__(iter))SPA_PTROFF((body), sizeof(struct spa_pod_choice_body), void);   \
             (iter) < (__typeof__(iter))SPA_PTROFF((body), (_size), void);                              \
             (iter) = (__typeof__(iter))SPA_PTROFF((iter), (body)->child.size, void))
 
#define SPA_POD_CHOICE_FOREACH(obj, iter)                                                       \
        SPA_POD_CHOICE_BODY_FOREACH(&(obj)->body, SPA_POD_BODY_SIZE(obj), iter)
 
#define SPA_POD_FOREACH(pod, size, iter)                                        \
        for ((iter) = (pod);                                                    \
             spa_pod_is_inside(pod, size, iter);                                \
             (iter) = (__typeof__(iter))spa_pod_next(iter))
 
#define SPA_POD_STRUCT_FOREACH(obj, iter)                                                       \
        SPA_POD_FOREACH(SPA_POD_BODY(obj), SPA_POD_BODY_SIZE(obj), iter)
 
#define SPA_POD_OBJECT_BODY_FOREACH(body, size, iter)                                           \
        for ((iter) = spa_pod_prop_first(body);                         \
             spa_pod_prop_is_inside(body, size, iter);                  \
             (iter) = spa_pod_prop_next(iter))
 
#define SPA_POD_OBJECT_FOREACH(obj, iter)                                                       \
        SPA_POD_OBJECT_BODY_FOREACH(&(obj)->body, SPA_POD_BODY_SIZE(obj), iter)
 
#define SPA_POD_SEQUENCE_BODY_FOREACH(body, size, iter)                                         \
        for ((iter) = spa_pod_control_first(body);                                              \
             spa_pod_control_is_inside(body, size, iter);                                               \
             (iter) = spa_pod_control_next(iter))
 
#define SPA_POD_SEQUENCE_FOREACH(seq, iter)                                                     \
        SPA_POD_SEQUENCE_BODY_FOREACH(&(seq)->body, SPA_POD_BODY_SIZE(seq), iter)
 
 
/* static */ inline void *spa_pod_from_data(void *data, size_t maxsize, off_t offset, size_t size)
{
        void *pod;
        if (size < sizeof(struct spa_pod) || offset + size > maxsize)
                return NULL;
        pod = SPA_PTROFF(data, offset, void);
        if (SPA_POD_SIZE(pod) > size)
                return NULL;
        return pod;
}
 
/* static */ inline int spa_pod_is_none(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_None);
}
 
/* static */ inline int spa_pod_is_bool(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Bool && SPA_POD_BODY_SIZE(pod) >= sizeof(int32_t));
}
 
/* static */ inline int spa_pod_get_bool(const struct spa_pod *pod, bool *value)
{
        if (!spa_pod_is_bool(pod))
                return -EINVAL;
        *value = !!SPA_POD_VALUE(struct spa_pod_bool, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_id(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Id && SPA_POD_BODY_SIZE(pod) >= sizeof(uint32_t));
}
 
/* static */ inline int spa_pod_get_id(const struct spa_pod *pod, uint32_t *value)
{
        if (!spa_pod_is_id(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_id, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_int(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Int && SPA_POD_BODY_SIZE(pod) >= sizeof(int32_t));
}
 
/* static */ inline int spa_pod_get_int(const struct spa_pod *pod, int32_t *value)
{
        if (!spa_pod_is_int(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_int, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_long(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Long && SPA_POD_BODY_SIZE(pod) >= sizeof(int64_t));
}
 
/* static */ inline int spa_pod_get_long(const struct spa_pod *pod, int64_t *value)
{
        if (!spa_pod_is_long(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_long, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_float(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Float && SPA_POD_BODY_SIZE(pod) >= sizeof(float));
}
 
/* static */ inline int spa_pod_get_float(const struct spa_pod *pod, float *value)
{
        if (!spa_pod_is_float(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_float, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_double(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Double && SPA_POD_BODY_SIZE(pod) >= sizeof(double));
}
 
/* static */ inline int spa_pod_get_double(const struct spa_pod *pod, double *value)
{
        if (!spa_pod_is_double(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_double, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_string(const struct spa_pod *pod)
{
        const char *s = (const char *)SPA_POD_CONTENTS(struct spa_pod_string, pod);
        return (SPA_POD_TYPE(pod) == SPA_TYPE_String &&
                        SPA_POD_BODY_SIZE(pod) > 0 &&
                        s[SPA_POD_BODY_SIZE(pod)-1] == '\0');
}
 
/* static */ inline int spa_pod_get_string(const struct spa_pod *pod, const char **value)
{
        if (!spa_pod_is_string(pod))
                return -EINVAL;
        *value = (const char *)SPA_POD_CONTENTS(struct spa_pod_string, pod);
        return 0;
}
 
/* static */ inline int spa_pod_copy_string(const struct spa_pod *pod, size_t maxlen, char *dest)
{
        const char *s = (const char *)SPA_POD_CONTENTS(struct spa_pod_string, pod);
        if (!spa_pod_is_string(pod) || maxlen < 1)
                return -EINVAL;
        strncpy(dest, s, maxlen-1);
        dest[maxlen-1]= '\0';
        return 0;
}
 
/* static */ inline int spa_pod_is_bytes(const struct spa_pod *pod)
{
        return SPA_POD_TYPE(pod) == SPA_TYPE_Bytes;
}
 
/* static */ inline int spa_pod_get_bytes(const struct spa_pod *pod, const void **value, uint32_t *len)
{
        if (!spa_pod_is_bytes(pod))
                return -EINVAL;
        *value = (const void *)SPA_POD_CONTENTS(struct spa_pod_bytes, pod);
        *len = SPA_POD_BODY_SIZE(pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_pointer(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Pointer &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_pod_pointer_body));
}
 
/* static */ inline int spa_pod_get_pointer(const struct spa_pod *pod, uint32_t *type, const void **value)
{
        if (!spa_pod_is_pointer(pod))
                return -EINVAL;
        *type = ((struct spa_pod_pointer*)pod)->body.type;
        *value = ((struct spa_pod_pointer*)pod)->body.value;
        return 0;
}
 
/* static */ inline int spa_pod_is_fd(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Fd &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(int64_t));
}
 
/* static */ inline int spa_pod_get_fd(const struct spa_pod *pod, int64_t *value)
{
        if (!spa_pod_is_fd(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_fd, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_rectangle(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Rectangle &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_rectangle));
}
 
/* static */ inline int spa_pod_get_rectangle(const struct spa_pod *pod, struct spa_rectangle *value)
{
        if (!spa_pod_is_rectangle(pod))
                return -EINVAL;
        *value = SPA_POD_VALUE(struct spa_pod_rectangle, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_fraction(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Fraction &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_fraction));
}
 
/* static */ inline int spa_pod_get_fraction(const struct spa_pod *pod, struct spa_fraction *value)
{
        spa_return_val_if_fail(spa_pod_is_fraction(pod), -EINVAL);
        *value = SPA_POD_VALUE(struct spa_pod_fraction, pod);
        return 0;
}
 
/* static */ inline int spa_pod_is_bitmap(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Bitmap &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(uint8_t));
}
 
/* static */ inline int spa_pod_is_array(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Array &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_pod_array_body));
}
 
/* static */ inline void *spa_pod_get_array(const struct spa_pod *pod, uint32_t *n_values)
{
        spa_return_val_if_fail(spa_pod_is_array(pod), NULL);
        *n_values = SPA_POD_ARRAY_N_VALUES(pod);
        return SPA_POD_ARRAY_VALUES(pod);
}
 
/* static */ inline uint32_t spa_pod_copy_array(const struct spa_pod *pod, uint32_t type,
                void *values, uint32_t max_values)
{
        uint32_t n_values;
        void *v = spa_pod_get_array(pod, &n_values);
        if (v == NULL || max_values == 0 || SPA_POD_ARRAY_VALUE_TYPE(pod) != type)
                return 0;
        n_values = SPA_MIN(n_values, max_values);
        memcpy(values, v, SPA_POD_ARRAY_VALUE_SIZE(pod) * n_values);
        return n_values;
}
 
/* static */ inline int spa_pod_is_choice(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Choice &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_pod_choice_body));
}
 
/* static */ inline struct spa_pod *spa_pod_get_values(const struct spa_pod *pod, uint32_t *n_vals, uint32_t *choice)
{
        if (pod->type == SPA_TYPE_Choice) {
                *n_vals = SPA_POD_CHOICE_N_VALUES(pod);
                if ((*choice = SPA_POD_CHOICE_TYPE(pod)) == SPA_CHOICE_None)
                        *n_vals = SPA_MIN(1u, SPA_POD_CHOICE_N_VALUES(pod));
                return (struct spa_pod*)SPA_POD_CHOICE_CHILD(pod);
        } else {
                *n_vals = 1;
                *choice = SPA_CHOICE_None;
                return (struct spa_pod*)pod;
        }
}
 
/* static */ inline int spa_pod_is_struct(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Struct);
}
 
/* static */ inline int spa_pod_is_object(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Object &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_pod_object_body));
}
 
/* static */ inline bool spa_pod_is_object_type(const struct spa_pod *pod, uint32_t type)
{
        return (pod && spa_pod_is_object(pod) && SPA_POD_OBJECT_TYPE(pod) == type);
}
 
/* static */ inline bool spa_pod_is_object_id(const struct spa_pod *pod, uint32_t id)
{
        return (pod && spa_pod_is_object(pod) && SPA_POD_OBJECT_ID(pod) == id);
}
 
/* static */ inline int spa_pod_is_sequence(const struct spa_pod *pod)
{
        return (SPA_POD_TYPE(pod) == SPA_TYPE_Sequence &&
                        SPA_POD_BODY_SIZE(pod) >= sizeof(struct spa_pod_sequence_body));
}
 
/* static */ inline const struct spa_pod_prop *spa_pod_object_find_prop(const struct spa_pod_object *pod,
                const struct spa_pod_prop *start, uint32_t key)
{
        const struct spa_pod_prop *first, *res;
 
        first = spa_pod_prop_first(&pod->body);
        start = start ? spa_pod_prop_next(start) : first;
 
        for (res = start; spa_pod_prop_is_inside(&pod->body, pod->pod.size, res);
             res = spa_pod_prop_next(res)) {
                if (res->key == key)
                        return res;
        }
        for (res = first; res != start; res = spa_pod_prop_next(res)) {
                if (res->key == key)
                        return res;
        }
        return NULL;
}
 
/* static */ inline const struct spa_pod_prop *spa_pod_find_prop(const struct spa_pod *pod,
                const struct spa_pod_prop *start, uint32_t key)
{
        if (!spa_pod_is_object(pod))
                return NULL;
        return spa_pod_object_find_prop((const struct spa_pod_object *)pod, start, key);
}
 
/* static */ inline int spa_pod_object_fixate(struct spa_pod_object *pod)
{
        struct spa_pod_prop *res;
        SPA_POD_OBJECT_FOREACH(pod, res) {
                if (res->value.type == SPA_TYPE_Choice &&
                    !SPA_FLAG_IS_SET(res->flags, SPA_POD_PROP_FLAG_DONT_FIXATE))
                        ((struct spa_pod_choice*)&res->value)->body.type = SPA_CHOICE_None;
        }
        return 0;
}
 
/* static */ inline int spa_pod_fixate(struct spa_pod *pod)
{
        if (!spa_pod_is_object(pod))
                return -EINVAL;
        return spa_pod_object_fixate((struct spa_pod_object *)pod);
}
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_POD_H */