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spa: json: Add a helper method to shrink an object string

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Arun Raghavan 2026-02-17 14:17:30 -08:00 • committed by Arun Raghavan
parent f5107f3e83
commit c244fbf945
1 changed files with 105 additions and 0 deletions
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105
spa/include/spa/utils/json.h
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@ -212,6 +212,111 @@ SPA_API_JSON_UTILS int spa_json_str_array_uint32(const char *arr, size_t arr_len
spa_json_make_str_array_unpack(32,uint32_t, atoi);
}
/* convenience */
#define _SPA_STR_APPEND(str, len, idx, value ) \
{ \
if ((idx) >= (len)) \
return -1; \
(str)[(idx)++] = (value); \
}
static int _spa_json_str_object_reduce(struct spa_json *json, char *out, size_t out_size, const char *value, size_t len)
{
struct spa_json sub;
size_t idx = 0;
int count = 0, res;
if (spa_json_is_object(value, len)) {
char key[1024];
_SPA_STR_APPEND(out, out_size, idx, '{');
spa_json_enter(json, &sub);
while ((len = spa_json_object_next(&sub, key, sizeof(key), &value)) > 0) {
_SPA_STR_APPEND(out, out_size, idx, '"');
if (idx + strlen(key) >= out_size)
return -1;
strcpy(&out[idx], key);
idx += strlen(key);
_SPA_STR_APPEND(out, out_size, idx, '"');
_SPA_STR_APPEND(out, out_size, idx, ':');
res = _spa_json_str_object_reduce(&sub, &out[idx], out_size - idx, value, len);
if (res < 0)
return res;
idx += res;
_SPA_STR_APPEND(out, out_size, idx, ',');
count++;
}
/* Remove trailing comma */
if (count)
idx--;
_SPA_STR_APPEND(out, out_size, idx, '}');
} else if (spa_json_is_array(value, len)) {
_SPA_STR_APPEND(out, out_size, idx, '[');
spa_json_enter(json, &sub);
while ((len = spa_json_next(&sub, &value)) > 0) {
res = _spa_json_str_object_reduce(&sub, &out[idx], out_size - idx, value, len);
if (res < 0)
return res;
idx += res;
_SPA_STR_APPEND(out, out_size, idx, ',');
count++;
}
/* Remove trailing comma */
if (count)
idx--;
_SPA_STR_APPEND(out, out_size, idx, ']');
} else if (spa_json_is_string(value, len) ||
spa_json_is_null(value, len) ||
spa_json_is_bool(value, len) ||
spa_json_is_int(value, len) ||
spa_json_is_float(value, len)) {
/* Object type we understand */
if (len >= out_size)
return -1;
strcpy(out, value);
idx += len;
} else {
/* Naked value, treat as string */
_SPA_STR_APPEND(out, out_size, idx, '"');
if (idx + len >= out_size)
return -1;
strncpy(&out[idx], value, len);
idx += len;
_SPA_STR_APPEND(out, out_size, idx, '"');
}
return idx;
}
/* Parse a JSON object string and strip all whitespaces */
SPA_API_JSON_UTILS int spa_json_str_object_reduce_inplace(char *str)
{
struct spa_json json;
size_t size = strlen(str) + 1, len;
char temp[size];
const char *value;
int res;
len = spa_json_begin(&json, str, size, &value);
res = _spa_json_str_object_reduce(&json, temp, size, value, len);
if (res < 0)
return res;
temp[res] = '\0';
strncpy(str, temp, size);
return res;
}
/**
* \}
*/