|
|
/* Simple Plugin API
|
|
|
*
|
|
|
* Copyright © 2020 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_UTILS_JSON_H
|
|
|
#define SPA_UTILS_JSON_H
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
extern "C" {
|
|
|
#else
|
|
|
#include <stdbool.h>
|
|
|
#endif
|
|
|
#include <stddef.h>
|
|
|
#include <stdlib.h>
|
|
|
#include <stdint.h>
|
|
|
|
|
|
|
|
|
struct spa_json {
|
|
|
const char *cur;
|
|
|
const char *end;
|
|
|
struct spa_json *parent;
|
|
|
uint32_t state;
|
|
|
uint32_t depth;
|
|
|
};
|
|
|
|
|
|
#define SPA_JSON_INIT(data,size) (struct spa_json) { (data), (data)+(size), }
|
|
|
|
|
|
static inline void spa_json_init(struct spa_json * iter, const char *data, size_t size)
|
|
|
{
|
|
|
*iter = SPA_JSON_INIT(data, size);
|
|
|
}
|
|
|
#define SPA_JSON_ENTER(iter) (struct spa_json) { (iter)->cur, (iter)->end, (iter), }
|
|
|
|
|
|
static inline void spa_json_enter(struct spa_json * iter, struct spa_json * sub)
|
|
|
{
|
|
|
*sub = SPA_JSON_ENTER(iter);
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_next(struct spa_json * iter, const char **value)
|
|
|
{
|
|
|
int utf8_remain = 0;
|
|
|
enum { __NONE, __STRUCT, __BARE, __STRING, __UTF8, __ESC };
|
|
|
|
|
|
for (; iter->cur < iter->end; iter->cur++) {
|
|
|
unsigned char cur = (unsigned char)*iter->cur;
|
|
|
again:
|
|
|
switch (iter->state) {
|
|
|
case __NONE:
|
|
|
iter->state = __STRUCT;
|
|
|
iter->depth = 0;
|
|
|
goto again;
|
|
|
case __STRUCT:
|
|
|
switch (cur) {
|
|
|
case '\t': case ' ': case '\r': case '\n': case ':': case ',':
|
|
|
continue;
|
|
|
case '"':
|
|
|
*value = iter->cur;
|
|
|
iter->state = __STRING;
|
|
|
continue;
|
|
|
case '[': case '{':
|
|
|
*value = iter->cur;
|
|
|
if (++iter->depth > 1)
|
|
|
continue;
|
|
|
iter->cur++;
|
|
|
return 1;
|
|
|
case '}': case ']':
|
|
|
if (iter->depth == 0) {
|
|
|
if (iter->parent)
|
|
|
iter->parent->cur = iter->cur;
|
|
|
return 0;
|
|
|
}
|
|
|
--iter->depth;
|
|
|
continue;
|
|
|
case '-': case 'a' ... 'z': case 'A' ... 'Z': case '0' ... '9':
|
|
|
*value = iter->cur;
|
|
|
iter->state = __BARE;
|
|
|
continue;
|
|
|
}
|
|
|
return -1;
|
|
|
case __BARE:
|
|
|
switch (cur) {
|
|
|
case '\t': case ' ': case '\r': case '\n':
|
|
|
case ':': case ',': case ']': case '}':
|
|
|
iter->state = __STRUCT;
|
|
|
if (iter->depth > 0)
|
|
|
goto again;
|
|
|
return iter->cur - *value;
|
|
|
default:
|
|
|
if (cur >= 32 && cur <= 126)
|
|
|
continue;
|
|
|
}
|
|
|
return -1;
|
|
|
case __STRING:
|
|
|
switch (cur) {
|
|
|
case '\\':
|
|
|
iter->state = __ESC;
|
|
|
continue;
|
|
|
case '"':
|
|
|
iter->state = __STRUCT;
|
|
|
if (iter->depth > 0)
|
|
|
continue;
|
|
|
iter->cur++;
|
|
|
return iter->cur - *value;
|
|
|
case 240 ... 247:
|
|
|
utf8_remain++;
|
|
|
SPA_FALLTHROUGH;
|
|
|
case 224 ... 239:
|
|
|
utf8_remain++;
|
|
|
SPA_FALLTHROUGH;
|
|
|
case 192 ... 223:
|
|
|
utf8_remain++;
|
|
|
iter->state = __UTF8;
|
|
|
continue;
|
|
|
default:
|
|
|
if (cur >= 32 && cur <= 126)
|
|
|
continue;
|
|
|
}
|
|
|
return -1;
|
|
|
case __UTF8:
|
|
|
switch (cur) {
|
|
|
case 128 ... 191:
|
|
|
if (--utf8_remain == 0)
|
|
|
iter->state = __STRING;
|
|
|
continue;
|
|
|
}
|
|
|
return -1;
|
|
|
case __ESC:
|
|
|
switch (cur) {
|
|
|
case '"': case '\\': case '/': case 'b': case 'f':
|
|
|
case 'n': case 'r': case 't': case 'u':
|
|
|
iter->state = __STRING;
|
|
|
continue;
|
|
|
}
|
|
|
return -1;
|
|
|
}
|
|
|
}
|
|
|
return iter->depth == 0 ? 0 : -1;
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_enter_container(struct spa_json *iter, struct spa_json *sub, char type)
|
|
|
{
|
|
|
const char *value;
|
|
|
if (spa_json_next(iter, &value) < 0 || *value != type)
|
|
|
return -1;
|
|
|
spa_json_enter(iter, sub);
|
|
|
return 1;
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_enter_object(struct spa_json *iter, struct spa_json *sub)
|
|
|
{
|
|
|
return spa_json_enter_container(iter, sub, '{');
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_enter_array(struct spa_json *iter, struct spa_json *sub)
|
|
|
{
|
|
|
return spa_json_enter_container(iter, sub, '[');
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_is_object(const char *val, int len)
|
|
|
{
|
|
|
return len > 0 && *val == '{';
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_array(const char *val, int len)
|
|
|
{
|
|
|
return len > 0 && *val == '[';
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_float(const char *val, int len)
|
|
|
{
|
|
|
char *end;
|
|
|
strtof(val, &end);
|
|
|
return end == val + len;
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_string(const char *val, int len)
|
|
|
{
|
|
|
return len > 1 && *val == '"';
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_null(const char *val, int len)
|
|
|
{
|
|
|
return len == 4 && strcmp(val, "null") == 0;
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_true(const char *val, int len)
|
|
|
{
|
|
|
return len == 4 && strcmp(val, "true") == 0;
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_false(const char *val, int len)
|
|
|
{
|
|
|
return len == 5 && strcmp(val, "false") == 0;
|
|
|
}
|
|
|
|
|
|
static inline bool spa_json_is_bool(const char *val, int len)
|
|
|
{
|
|
|
return spa_json_is_true(val, len) || spa_json_is_false(val, len);
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_parse_float(const char *val, int len, float *result)
|
|
|
{
|
|
|
char *end;
|
|
|
*result = strtof(val, &end);
|
|
|
return end == val + len;
|
|
|
}
|
|
|
static inline int spa_json_parse_bool(const char *val, int len, bool *result)
|
|
|
{
|
|
|
if ((*result = spa_json_is_true(val, len)))
|
|
|
return 1;
|
|
|
if (!(*result = !spa_json_is_false(val, len)))
|
|
|
return 1;
|
|
|
return -1;
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_parse_string(const char *val, int len, char *result)
|
|
|
{
|
|
|
const char *p;
|
|
|
if (!spa_json_is_string(val, len))
|
|
|
return -1;
|
|
|
for (p = val+1; p < val + len-1; p++) {
|
|
|
if (*p == '\\') {
|
|
|
p++;
|
|
|
if (*p == 'n')
|
|
|
*result++ = '\n';
|
|
|
else if (*p == 'r')
|
|
|
*result++ = '\r';
|
|
|
else if (*p == 'b')
|
|
|
*result++ = '\b';
|
|
|
else if (*p == 't')
|
|
|
*result++ = '\t';
|
|
|
else
|
|
|
*result++ = *p;
|
|
|
} else
|
|
|
*result++ = *p;
|
|
|
}
|
|
|
*result++ = '\0';
|
|
|
return 1;
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_get_float(struct spa_json *iter, float *res)
|
|
|
{
|
|
|
const char *value;
|
|
|
int len;
|
|
|
if ((len = spa_json_next(iter, &value)) <= 0)
|
|
|
return -1;
|
|
|
return spa_json_parse_float(value, len, res);
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_get_bool(struct spa_json *iter, bool *res)
|
|
|
{
|
|
|
const char *value;
|
|
|
int len;
|
|
|
if ((len = spa_json_next(iter, &value)) <= 0)
|
|
|
return -1;
|
|
|
return spa_json_parse_bool(value, len, res);
|
|
|
}
|
|
|
|
|
|
static inline int spa_json_get_string(struct spa_json *iter, char *res, int maxlen)
|
|
|
{
|
|
|
const char *value;
|
|
|
int len;
|
|
|
if ((len = spa_json_next(iter, &value)) <= 0 || maxlen < len)
|
|
|
return -1;
|
|
|
return spa_json_parse_string(value, len, res);
|
|
|
}
|
|
|
|
|
|
#ifdef __cplusplus
|
|
|
} /* extern "C" */
|
|
|
#endif
|
|
|
|
|
|
#endif /* SPA_UTILS_JSON_H */ |
