compare.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */

#ifndef SPA_POD_COMPARE_H
#define SPA_POD_COMPARE_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdarg.h>
#include <errno.h>
#include <stdint.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>

#include <spa/param/props.h>
#include <spa/pod/iter.h>
#include <spa/pod/builder.h>

#ifndef SPA_API_POD_COMPARE
 #ifdef SPA_API_IMPL
  #define SPA_API_POD_COMPARE SPA_API_IMPL
 #else
  #define SPA_API_POD_COMPARE static inline
 #endif
#endif

SPA_API_POD_COMPARE int spa_pod_compare_value(uint32_t type, const void *r1, const void *r2, uint32_t size)
{
        switch (type) {
        case SPA_TYPE_None:
                return 0;
        case SPA_TYPE_Bool:
                return SPA_CMP(!!*(int32_t *)r1, !!*(int32_t *)r2);
        case SPA_TYPE_Id:
                return SPA_CMP(*(uint32_t *)r1, *(uint32_t *)r2);
        case SPA_TYPE_Int:
                return SPA_CMP(*(int32_t *)r1, *(int32_t *)r2);
        case SPA_TYPE_Long:
                return SPA_CMP(*(int64_t *)r1, *(int64_t *)r2);
        case SPA_TYPE_Float:
                return SPA_CMP(*(float *)r1, *(float *)r2);
        case SPA_TYPE_Double:
                return SPA_CMP(*(double *)r1, *(double *)r2);
        case SPA_TYPE_String:
                return strcmp((char *)r1, (char *)r2);
        case SPA_TYPE_Bytes:
                return memcmp((char *)r1, (char *)r2, size);
        case SPA_TYPE_Rectangle:
        {
                const struct spa_rectangle *rec1 = (struct spa_rectangle *) r1,
                    *rec2 = (struct spa_rectangle *) r2;
                if (rec1->width == rec2->width && rec1->height == rec2->height)
                        return 0;
                else if (rec1->width < rec2->width || rec1->height < rec2->height)
                        return -1;
                else
                        return 1;
        }
        case SPA_TYPE_Fraction:
        {
                const struct spa_fraction *f1 = (struct spa_fraction *) r1,
                    *f2 = (struct spa_fraction *) r2;
                uint64_t n1, n2;
                n1 = ((uint64_t) f1->num) * f2->denom;
                n2 = ((uint64_t) f2->num) * f1->denom;
                return SPA_CMP(n1, n2);
        }
        default:
                break;
        }
        return 0;
}

SPA_API_POD_COMPARE int spa_pod_compare(const struct spa_pod *pod1,
                                  const struct spa_pod *pod2)
{
        int res = 0;
        uint32_t n_vals1, n_vals2;
        uint32_t choice1, choice2;

        spa_return_val_if_fail(pod1 != NULL, -EINVAL);
        spa_return_val_if_fail(pod2 != NULL, -EINVAL);

        pod1 = spa_pod_get_values(pod1,  &n_vals1, &choice1);
        pod2 = spa_pod_get_values(pod2,  &n_vals2, &choice2);

        if (n_vals1 != n_vals2)
                return -EINVAL;

        if (SPA_POD_TYPE(pod1) != SPA_POD_TYPE(pod2))
                return -EINVAL;

        switch (SPA_POD_TYPE(pod1)) {
        case SPA_TYPE_Struct:
        {
                const struct spa_pod *p1, *p2;
                size_t p1s, p2s;

                p1 = (const struct spa_pod*)SPA_POD_BODY_CONST(pod1);
                p1s = SPA_POD_BODY_SIZE(pod1);
                p2 = (const struct spa_pod*)SPA_POD_BODY_CONST(pod2);
                p2s = SPA_POD_BODY_SIZE(pod2);

                while (true) {
                        if (!spa_pod_is_inside(pod1, p1s, p1) ||
                            !spa_pod_is_inside(pod2, p2s, p2))
                                return -EINVAL;

                        if ((res = spa_pod_compare(p1, p2)) != 0)
                                return res;

                        p1 = (const struct spa_pod*)spa_pod_next(p1);
                        p2 = (const struct spa_pod*)spa_pod_next(p2);
                }
                break;
        }
        case SPA_TYPE_Object:
        {
                const struct spa_pod_prop *p1, *p2;
                const struct spa_pod_object *o1, *o2;

                o1 = (const struct spa_pod_object*)pod1;
                o2 = (const struct spa_pod_object*)pod2;

                p2 = NULL;
                SPA_POD_OBJECT_FOREACH(o1, p1) {
                        if ((p2 = spa_pod_object_find_prop(o2, p2, p1->key)) == NULL)
                                return 1;
                        if ((res = spa_pod_compare(&p1->value, &p2->value)) != 0)
                                return res;
                }
                p1 = NULL;
                SPA_POD_OBJECT_FOREACH(o2, p2) {
                        if ((p1 = spa_pod_object_find_prop(o1, p1, p2->key)) == NULL)
                                return -1;
                }
                break;
        }
        case SPA_TYPE_Array:
        {
                if (SPA_POD_BODY_SIZE(pod1) != SPA_POD_BODY_SIZE(pod2))
                        return -EINVAL;
                res = memcmp(SPA_POD_BODY(pod1), SPA_POD_BODY(pod2), SPA_POD_BODY_SIZE(pod2));
                break;
        }
        default:
                if (SPA_POD_BODY_SIZE(pod1) != SPA_POD_BODY_SIZE(pod2))
                        return -EINVAL;
                res = spa_pod_compare_value(SPA_POD_TYPE(pod1),
                                SPA_POD_BODY(pod1), SPA_POD_BODY(pod2),
                                SPA_POD_BODY_SIZE(pod1));
                break;
        }
        return res;
}

#ifdef __cplusplus
}
#endif

#endif