mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
synced 2025-10-29 05:40:27 -04:00
f2cdb15e0c
We need exactly 4 hex characters, everything else is refused. We also copy those characters directly to the output string without assuming any encoding. See #2337
447 lines
10 KiB
C
447 lines
10 KiB
C
/* Simple Plugin API
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*
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* Copyright © 2020 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#ifndef SPA_UTILS_JSON_H
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#define SPA_UTILS_JSON_H
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#ifdef __cplusplus
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extern "C" {
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#else
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#include <stdbool.h>
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#endif
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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#include <math.h>
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#include <float.h>
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#include <spa/utils/defs.h>
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#include <spa/utils/string.h>
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/** \defgroup spa_json JSON
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* Relaxed JSON variant parsing
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*/
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/**
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* \addtogroup spa_json
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* \{
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*/
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/* a simple JSON compatible tokenizer */
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struct spa_json {
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const char *cur;
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const char *end;
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struct spa_json *parent;
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uint32_t state;
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uint32_t depth;
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};
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#define SPA_JSON_INIT(data,size) (struct spa_json) { (data), (data)+(size), }
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static inline void spa_json_init(struct spa_json * iter, const char *data, size_t size)
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{
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*iter = SPA_JSON_INIT(data, size);
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}
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#define SPA_JSON_ENTER(iter) (struct spa_json) { (iter)->cur, (iter)->end, (iter), }
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static inline void spa_json_enter(struct spa_json * iter, struct spa_json * sub)
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{
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*sub = SPA_JSON_ENTER(iter);
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}
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#define SPA_JSON_SAVE(iter) (struct spa_json) { (iter)->cur, (iter)->end, }
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/** Get the next token. \a value points to the token and the return value
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* is the length. */
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static inline int spa_json_next(struct spa_json * iter, const char **value)
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{
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int utf8_remain = 0;
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enum { __NONE, __STRUCT, __BARE, __STRING, __UTF8, __ESC, __COMMENT };
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*value = iter->cur;
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for (; iter->cur < iter->end; iter->cur++) {
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unsigned char cur = (unsigned char)*iter->cur;
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again:
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switch (iter->state) {
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case __NONE:
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iter->state = __STRUCT;
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iter->depth = 0;
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goto again;
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case __STRUCT:
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switch (cur) {
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case '\0': case '\t': case ' ': case '\r': case '\n': case ':': case '=': case ',':
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continue;
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case '#':
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iter->state = __COMMENT;
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continue;
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case '"':
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*value = iter->cur;
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iter->state = __STRING;
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continue;
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case '[': case '{':
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*value = iter->cur;
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if (++iter->depth > 1)
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continue;
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iter->cur++;
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return 1;
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case '}': case ']':
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if (iter->depth == 0) {
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if (iter->parent)
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iter->parent->cur = iter->cur;
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return 0;
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}
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--iter->depth;
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continue;
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default:
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*value = iter->cur;
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iter->state = __BARE;
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}
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continue;
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case __BARE:
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switch (cur) {
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case '\t': case ' ': case '\r': case '\n':
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case ':': case ',': case '=': case ']': case '}':
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iter->state = __STRUCT;
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if (iter->depth > 0)
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goto again;
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return iter->cur - *value;
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}
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continue;
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case __STRING:
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switch (cur) {
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case '\\':
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iter->state = __ESC;
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continue;
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case '"':
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iter->state = __STRUCT;
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if (iter->depth > 0)
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continue;
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return ++iter->cur - *value;
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case 240 ... 247:
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utf8_remain++;
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SPA_FALLTHROUGH;
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case 224 ... 239:
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utf8_remain++;
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SPA_FALLTHROUGH;
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case 192 ... 223:
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utf8_remain++;
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iter->state = __UTF8;
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continue;
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default:
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if (cur >= 32 && cur <= 126)
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continue;
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}
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return -1;
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case __UTF8:
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switch (cur) {
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case 128 ... 191:
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if (--utf8_remain == 0)
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iter->state = __STRING;
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continue;
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}
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return -1;
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case __ESC:
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switch (cur) {
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case '"': case '\\': case '/': case 'b': case 'f':
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case 'n': case 'r': case 't': case 'u':
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iter->state = __STRING;
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continue;
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}
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return -1;
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case __COMMENT:
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switch (cur) {
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case '\n': case '\r':
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iter->state = __STRUCT;
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}
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}
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}
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if (iter->depth != 0)
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return -1;
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if (iter->state != __STRUCT) {
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iter->state = __STRUCT;
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return iter->cur - *value;
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}
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return 0;
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}
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static inline int spa_json_enter_container(struct spa_json *iter, struct spa_json *sub, char type)
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{
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const char *value;
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if (spa_json_next(iter, &value) <= 0 || *value != type)
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return -1;
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spa_json_enter(iter, sub);
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return 1;
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}
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static inline int spa_json_is_container(const char *val, int len)
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{
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return len > 0 && (*val == '{' || *val == '[');
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}
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static inline int spa_json_container_len(struct spa_json *iter, const char *value, int len)
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{
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const char *val;
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struct spa_json sub;
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spa_json_enter(iter, &sub);
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while (spa_json_next(&sub, &val) > 0);
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return sub.cur + 1 - value;
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}
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/* object */
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static inline int spa_json_is_object(const char *val, int len)
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{
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return len > 0 && *val == '{';
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}
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static inline int spa_json_enter_object(struct spa_json *iter, struct spa_json *sub)
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{
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return spa_json_enter_container(iter, sub, '{');
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}
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/* array */
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static inline bool spa_json_is_array(const char *val, int len)
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{
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return len > 0 && *val == '[';
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}
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static inline int spa_json_enter_array(struct spa_json *iter, struct spa_json *sub)
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{
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return spa_json_enter_container(iter, sub, '[');
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}
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/* null */
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static inline bool spa_json_is_null(const char *val, int len)
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{
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return len == 4 && strncmp(val, "null", 4) == 0;
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}
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/* float */
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static inline int spa_json_parse_float(const char *val, int len, float *result)
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{
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char *end;
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*result = spa_strtof(val, &end);
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return len > 0 && end == val + len;
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}
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static inline bool spa_json_is_float(const char *val, int len)
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{
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float dummy;
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return spa_json_parse_float(val, len, &dummy);
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}
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static inline int spa_json_get_float(struct spa_json *iter, float *res)
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{
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const char *value;
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int len;
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if ((len = spa_json_next(iter, &value)) <= 0)
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return -1;
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return spa_json_parse_float(value, len, res);
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}
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static inline char *spa_json_format_float(char *str, int size, float val)
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{
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if (SPA_UNLIKELY(!isnormal(val))) {
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if (val == INFINITY)
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val = FLT_MAX;
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else if (val == -INFINITY)
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val = FLT_MIN;
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else
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val = 0.0f;
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}
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return spa_dtoa(str, size, val);
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}
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/* int */
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static inline int spa_json_parse_int(const char *val, int len, int *result)
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{
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char *end;
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*result = strtol(val, &end, 0);
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return len > 0 && end == val + len;
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}
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static inline bool spa_json_is_int(const char *val, int len)
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{
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int dummy;
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return spa_json_parse_int(val, len, &dummy);
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}
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static inline int spa_json_get_int(struct spa_json *iter, int *res)
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{
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const char *value;
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int len;
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if ((len = spa_json_next(iter, &value)) <= 0)
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return -1;
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return spa_json_parse_int(value, len, res);
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}
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/* bool */
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static inline bool spa_json_is_true(const char *val, int len)
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{
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return len == 4 && strncmp(val, "true", 4) == 0;
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}
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static inline bool spa_json_is_false(const char *val, int len)
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{
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return len == 5 && strncmp(val, "false", 5) == 0;
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}
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static inline bool spa_json_is_bool(const char *val, int len)
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{
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return spa_json_is_true(val, len) || spa_json_is_false(val, len);
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}
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static inline int spa_json_parse_bool(const char *val, int len, bool *result)
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{
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if ((*result = spa_json_is_true(val, len)))
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return 1;
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if (!(*result = !spa_json_is_false(val, len)))
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return 1;
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return -1;
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}
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static inline int spa_json_get_bool(struct spa_json *iter, bool *res)
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{
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const char *value;
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int len;
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if ((len = spa_json_next(iter, &value)) <= 0)
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return -1;
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return spa_json_parse_bool(value, len, res);
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}
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/* string */
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static inline bool spa_json_is_string(const char *val, int len)
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{
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return len > 1 && *val == '"';
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}
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static inline int spa_json_parse_stringn(const char *val, int len, char *result, int maxlen)
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{
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const char *p;
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if (maxlen <= len)
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return -1;
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if (!spa_json_is_string(val, len)) {
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if (result != val)
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strncpy(result, val, len);
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result += len;
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} else {
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for (p = val+1; p < val + len; p++) {
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if (*p == '\\') {
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p++;
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if (*p == 'n')
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*result++ = '\n';
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else if (*p == 'r')
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*result++ = '\r';
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else if (*p == 'b')
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*result++ = '\b';
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else if (*p == 't')
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*result++ = '\t';
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else if (*p == 'f')
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*result++ = '\f';
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else if (*p == 'u') {
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uint8_t v[2];
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if (p + 5 > val + len ||
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sscanf(p+1, "%02hhx%02hhx", &v[0], &v[1]) != 2) {
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*result++ = *p;
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} else {
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p += 4;
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if (v[0] != 0)
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*result++ = v[0];
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*result++ = v[1];
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}
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} else
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*result++ = *p;
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} else if (*p == '\"') {
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break;
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} else
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*result++ = *p;
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}
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}
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*result = '\0';
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return 1;
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}
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static inline int spa_json_parse_string(const char *val, int len, char *result)
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{
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return spa_json_parse_stringn(val, len, result, len+1);
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}
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static inline int spa_json_get_string(struct spa_json *iter, char *res, int maxlen)
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{
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const char *value;
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int len;
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if ((len = spa_json_next(iter, &value)) <= 0)
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return -1;
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return spa_json_parse_stringn(value, len, res, maxlen);
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}
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static inline int spa_json_encode_string(char *str, int size, const char *val)
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{
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int len = 0;
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static const char hex[] = { "0123456789abcdef" };
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#define __PUT(c) { if (len < size) *str++ = c; len++; }
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__PUT('"');
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while (*val) {
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switch (*val) {
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case '\n':
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__PUT('\\'); __PUT('n');
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break;
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case '\r':
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__PUT('\\'); __PUT('r');
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break;
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case '\b':
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__PUT('\\'); __PUT('b');
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break;
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case '\t':
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__PUT('\\'); __PUT('t');
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break;
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case '\f':
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__PUT('\\'); __PUT('f');
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break;
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case '\\':
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case '"':
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__PUT('\\'); __PUT(*val);
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break;
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default:
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if (*val > 0 && *val < 0x20) {
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__PUT('\\'); __PUT('u');
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__PUT('0'); __PUT('0');
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__PUT(hex[((*val)>>4)&0xf]); __PUT(hex[(*val)&0xf]);
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} else {
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__PUT(*val);
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}
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break;
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}
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val++;
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}
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__PUT('"');
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__PUT('\0');
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#undef __PUT
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return len-1;
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}
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/**
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* \}
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*/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* SPA_UTILS_JSON_H */
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