dict-utils.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2023 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_PARAM_DICT_UTILS_H
#define SPA_PARAM_DICT_UTILS_H
 
#include <float.h>
 
#include <spa/utils/dict.h>
#include <spa/pod/builder.h>
#include <spa/pod/iter.h>
#include <spa/pod/parser.h>
#include <spa/pod/compare.h>
#include <spa/param/dict.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef SPA_API_DICT_UTILS
 #ifdef SPA_API_IMPL
  #define SPA_API_DICT_UTILS SPA_API_IMPL
 #else
  #define SPA_API_DICT_UTILS static inline
 #endif
#endif
 
SPA_API_DICT_UTILS int
spa_param_dict_compare(const struct spa_pod *a, const struct spa_pod *b)
{
        return spa_pod_memcmp(a, b);
}
 
SPA_API_DICT_UTILS struct spa_pod *
spa_param_dict_build_dict(struct spa_pod_builder *builder, uint32_t id, struct spa_dict *dict)
{
        struct spa_pod_frame f[2];
        uint32_t i, n_items;
 
        spa_pod_builder_push_object(builder, &f[0], SPA_TYPE_OBJECT_ParamDict, id);
 
        n_items = dict ? dict->n_items : 0;
 
        spa_pod_builder_prop(builder, SPA_PARAM_DICT_info, SPA_POD_PROP_FLAG_HINT_DICT);
        spa_pod_builder_push_struct(builder, &f[1]);
        spa_pod_builder_int(builder, n_items);
        for (i = 0; i < n_items; i++) {
                spa_pod_builder_string(builder, dict->items[i].key);
                spa_pod_builder_string(builder, dict->items[i].value);
        }
        spa_pod_builder_pop(builder, &f[1]);
 
        return (struct spa_pod*)spa_pod_builder_pop(builder, &f[0]);
}
 
SPA_API_DICT_UTILS struct spa_pod *
spa_param_dict_build_info(struct spa_pod_builder *builder, uint32_t id, struct spa_param_dict_info *info)
{
        struct spa_pod_frame f;
        spa_pod_builder_push_object(builder, &f, SPA_TYPE_OBJECT_ParamDict, id);
        spa_pod_builder_add(builder, SPA_PARAM_DICT_info, SPA_POD_PROP_FLAG_HINT_DICT);
        spa_pod_builder_primitive(builder, info->info);
        return (struct spa_pod*)spa_pod_builder_pop(builder, &f);
}
 
SPA_API_DICT_UTILS int
spa_param_dict_parse(const struct spa_pod *dict, struct spa_param_dict_info *info, size_t size)
{
        memset(info, 0, size);
        return spa_pod_parse_object(dict,
                        SPA_TYPE_OBJECT_ParamDict, NULL,
                        SPA_PARAM_DICT_info, SPA_POD_PodStruct(&info->info));
}
 
SPA_API_DICT_UTILS int
spa_param_dict_info_parse(const struct spa_param_dict_info *info, size_t size,
                struct spa_dict *dict, struct spa_dict_item *items)
{
        struct spa_pod_parser prs;
        uint32_t n, n_items;
        const char *key, *value;
        struct spa_pod_frame f[1];
 
        spa_pod_parser_pod(&prs, info->info);
        if (spa_pod_parser_push_struct(&prs, &f[0]) < 0 ||
            spa_pod_parser_get_int(&prs, (int32_t*)&n_items) < 0)
                return -EINVAL;
 
        if (items == NULL) {
                dict->n_items = n_items;
                return 0;
        }
        n_items = SPA_MIN(dict->n_items, n_items);
 
        for (n = 0; n < n_items; n++) {
                if (spa_pod_parser_get(&prs,
                                SPA_POD_String(&key),
                                SPA_POD_String(&value),
                                NULL) < 0)
                        break;
                if (key == NULL || value == NULL)
                        return -EINVAL;
                items[n].key = key;
                items[n].value = value;
        }
        dict->items = items;
        spa_pod_parser_pop(&prs, &f[0]);
        return 0;
}
 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_PARAM_DICT_UTILS_H */