mirror of
https://gitlab.freedesktop.org/pipewire/media-session.git
synced 2025-12-20 04:10:02 +01:00
327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/* Spa
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*
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* Copyright © 2018 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_POD_PARSER_H__
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#define __SPA_POD_PARSER_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <errno.h>
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#include <stdarg.h>
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#include <spa/pod/iter.h>
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struct spa_pod_parser {
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int depth;
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struct spa_pod_iter iter[SPA_POD_MAX_DEPTH];
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};
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static inline void spa_pod_parser_init(struct spa_pod_parser *parser,
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const void *data, uint32_t size, uint32_t offset)
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{
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parser->depth = 0;
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spa_pod_iter_init(&parser->iter[0], data, size, offset);
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}
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static inline void spa_pod_parser_pod(struct spa_pod_parser *parser,
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const struct spa_pod *pod)
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{
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spa_pod_parser_init(parser, pod, SPA_POD_SIZE(pod), 0);
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}
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static inline bool spa_pod_parser_can_collect(struct spa_pod *pod, char type)
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{
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if (type == 'P')
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return true;
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switch (SPA_POD_TYPE(pod)) {
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case SPA_TYPE_None:
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return type == 'T' || type == 'O' || type == 'V' || type == 's';
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case SPA_TYPE_Bool:
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return type == 'b';
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case SPA_TYPE_Id:
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return type == 'I';
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case SPA_TYPE_Int:
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return type == 'i';
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case SPA_TYPE_Long:
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return type == 'l';
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case SPA_TYPE_Float:
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return type == 'f';
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case SPA_TYPE_Double:
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return type == 'd';
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case SPA_TYPE_String:
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return type == 's' || type == 'S';
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case SPA_TYPE_Bytes:
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return type == 'z';
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case SPA_TYPE_Rectangle:
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return type == 'R';
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case SPA_TYPE_Fraction:
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return type == 'F';
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case SPA_TYPE_Bitmap:
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return type == 'B';
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case SPA_TYPE_Array:
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return type == 'a';
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case SPA_TYPE_Struct:
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return type == 'T';
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case SPA_TYPE_Object:
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return type == 'O';
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case SPA_TYPE_Pointer:
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return type == 'p';
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case SPA_TYPE_Fd:
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return type == 'h';
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case SPA_TYPE_Choice:
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return type == 'V' ||
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spa_pod_parser_can_collect(SPA_POD_CHOICE_CHILD(pod), type);
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default:
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return false;
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}
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}
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#define SPA_POD_PARSER_COLLECT(pod,type,args) \
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do { \
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switch (type) { \
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case 'b': \
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*va_arg(args, int*) = SPA_POD_VALUE(struct spa_pod_bool, pod); \
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break; \
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case 'I': \
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case 'i': \
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*va_arg(args, int32_t*) = SPA_POD_VALUE(struct spa_pod_int, pod); \
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break; \
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case 'l': \
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*va_arg(args, int64_t*) = SPA_POD_VALUE(struct spa_pod_long, pod); \
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break; \
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case 'f': \
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*va_arg(args, float*) = SPA_POD_VALUE(struct spa_pod_float, pod); \
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break; \
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case 'd': \
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*va_arg(args, double*) = SPA_POD_VALUE(struct spa_pod_double, pod); \
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break; \
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case 's': \
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*va_arg(args, char**) = \
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(pod == NULL || (SPA_POD_TYPE(pod) == SPA_TYPE_None) \
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? NULL \
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: (char *)SPA_POD_CONTENTS(struct spa_pod_string, pod)); \
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break; \
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case 'S': \
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{ \
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char *dest = va_arg(args, char*); \
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uint32_t maxlen = va_arg(args, uint32_t); \
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strncpy(dest, (char *)SPA_POD_CONTENTS(struct spa_pod_string, pod), maxlen-1); \
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break; \
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} \
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case 'z': \
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*(va_arg(args, void **)) = SPA_POD_CONTENTS(struct spa_pod_bytes, pod); \
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*(va_arg(args, uint32_t *)) = SPA_POD_BODY_SIZE(pod); \
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break; \
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case 'R': \
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*va_arg(args, struct spa_rectangle*) = \
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SPA_POD_VALUE(struct spa_pod_rectangle, pod); \
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break; \
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case 'F': \
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*va_arg(args, struct spa_fraction*) = \
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SPA_POD_VALUE(struct spa_pod_fraction, pod); \
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break; \
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case 'B': \
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*va_arg(args, uint32_t **) = \
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(uint32_t *) SPA_POD_CONTENTS(struct spa_pod_bitmap, pod); \
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break; \
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case 'p': \
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{ \
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struct spa_pod_pointer_body *b = \
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(struct spa_pod_pointer_body *) SPA_POD_BODY(pod); \
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*(va_arg(args, const void **)) = b->value; \
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break; \
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} \
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case 'h': \
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*va_arg(args, int*) = SPA_POD_VALUE(struct spa_pod_fd, pod); \
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break; \
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case 'V': \
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case 'P': \
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case 'O': \
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case 'T': \
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*va_arg(args, struct spa_pod**) = \
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(pod == NULL || (SPA_POD_TYPE(pod) == SPA_TYPE_None) \
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? NULL : pod); \
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break; \
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default: \
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break; \
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} \
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} while(false)
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#define SPA_POD_PARSER_SKIP(type,args) \
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do { \
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switch (type) { \
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case 'S': \
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va_arg(args, void*); \
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va_arg(args, uint32_t); \
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break; \
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case 'z': \
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va_arg(args, void**); \
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/* fallthrough */ \
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case 'b': \
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case 'I': \
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case 'i': \
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case 'l': \
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case 'f': \
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case 'd': \
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case 's': \
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case 'R': \
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case 'F': \
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case 'B': \
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case 'p': \
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case 'h': \
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case 'V': \
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case 'P': \
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case 'T': \
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case 'O': \
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va_arg(args, void*); \
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break; \
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} \
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} while(false)
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static inline int spa_pod_parser_getv(struct spa_pod_parser *parser,
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const char *format, va_list args)
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{
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struct spa_pod *pod = NULL, *current;
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struct spa_pod_prop *prop = NULL;
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bool required = true, suppress = false, skip = false;
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struct spa_pod_iter *it = &parser->iter[parser->depth];
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current = pod = spa_pod_iter_current(it);
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while (format) {
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switch (*format) {
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case '{':
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if (pod == NULL || SPA_POD_TYPE(pod) != SPA_TYPE_Object)
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return -EINVAL;
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break;
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case '[':
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if (pod == NULL || SPA_POD_TYPE(pod) != SPA_TYPE_Struct)
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return -EINVAL;
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if (++parser->depth >= SPA_POD_MAX_DEPTH)
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return -EINVAL;
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it = &parser->iter[parser->depth];
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spa_pod_iter_init(it, pod, SPA_POD_SIZE(pod), sizeof(struct spa_pod_struct));
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goto read_pod;
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case ']':
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if (current != NULL)
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return -EINVAL;
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if (--parser->depth < 0)
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return -EINVAL;
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case '}':
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it = &parser->iter[parser->depth];
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current = spa_pod_iter_current(it);
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spa_pod_iter_advance(it, current);
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goto read_pod;
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case '\0':
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format = va_arg(args, char *);
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continue;
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case ' ': case '\n': case '\t': case '\r':
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break;
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case '?':
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required = false;
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break;
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case '*':
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suppress = true;
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break;
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case ':':
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{
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uint32_t key = va_arg(args, uint32_t);
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const struct spa_pod *obj = (const struct spa_pod *) parser->iter[parser->depth].data;
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prop = spa_pod_find_prop(obj, key);
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if (prop != NULL)
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pod = &prop->value;
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else
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pod = NULL;
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it->offset = it->size;
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current = NULL;
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required = true;
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break;
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}
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case 'V':
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pod = (struct spa_pod *) prop;
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if (pod == NULL && required)
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return -ESRCH;
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goto collect;
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default:
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if (pod == NULL || !spa_pod_parser_can_collect(pod, *format)) {
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if (required)
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return -ESRCH;
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skip = true;
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}
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collect:
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if (pod->type == SPA_TYPE_Choice)
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pod = SPA_POD_CHOICE_CHILD(pod);
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if (suppress)
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suppress = false;
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else if (skip)
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SPA_POD_PARSER_SKIP(*format, args);
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else
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SPA_POD_PARSER_COLLECT(pod, *format, args);
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spa_pod_iter_advance(it, current);
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required = true;
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skip = false;
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read_pod:
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pod = current = spa_pod_iter_current(it);
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break;
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}
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format++;
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}
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return 0;
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}
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static inline int spa_pod_parser_get(struct spa_pod_parser *parser,
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const char *format, ...)
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{
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int res;
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va_list args;
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va_start(args, format);
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res = spa_pod_parser_getv(parser, format, args);
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va_end(args);
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return res;
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}
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#define spa_pod_object_parse(pod,...) \
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({ \
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struct spa_pod_parser __p; \
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spa_pod_parser_pod(&__p, pod); \
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spa_pod_parser_get(&__p, "{", ##__VA_ARGS__, NULL); \
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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_POD_PARSER_H__ */
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