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/* PipeWire AGL Cluster IPC
*
* Copyright © 2018 Wim Taymans
* Copyright © 2021 Collabora Ltd.
* @author George Kiagiadakis <george.kiagiadakis@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
/* Trimmed down version of struct spa_pod from PipeWire's Simple Plugin API
* This aims to be compatible with spa_pod, so you can cast icipc_data
* to spa_pod and still be able to use it */
struct icipc_data {
uint32_t size; /* size of the body */
uint32_t type; /* type of the body */
/* type-specific body follows */
};
#define ICIPC_DATA_BODY_SIZE(d) (((const struct icipc_data*)(d))->size)
#define ICIPC_DATA_TYPE(d) (((const struct icipc_data*)(d))->type)
#define ICIPC_DATA_SIZE(d) (sizeof(struct icipc_data) + ICIPC_DATA_BODY_SIZE(d))
#define ICIPC_DATA_BODY(d) ((void*)(((uint8_t *) d) + sizeof(struct icipc_data)))
#define ICIPC_DATA_BODY_CONST(d) ((const void*)(((const uint8_t *) d) + sizeof(struct icipc_data)))
enum {
DATA_TYPE_NONE = 1, /* SPA_TYPE_None */
DATA_TYPE_ID = 3, /* SPA_TYPE_Id */
DATA_TYPE_INT = 4, /* SPA_TYPE_Int */
DATA_TYPE_STRING = 8, /* SPA_TYPE_String */
DATA_TYPE_STRUCT = 14, /* SPA_TYPE_Struct */
};
#define PTR_ALIGNMENT 8
#define ROUND_UP_TO_ALIGN(num) (((num) + (PTR_ALIGNMENT - 1)) & ~((PTR_ALIGNMENT) - 1))
#define PTR_IS_ALIGNED(p) (((intptr_t)(p) & (PTR_ALIGNMENT-1)) == 0)
typedef struct DataBuilder {
union {
uint8_t *buffer;
struct icipc_data *data;
};
union {
uint8_t *ptr;
struct icipc_data *ptr_as_data;
};
size_t buf_size;
} DataBuilder;
typedef struct DataParser {
union {
const uint8_t *buffer;
const struct icipc_data *data;
};
union {
const uint8_t *ptr;
const struct icipc_data *ptr_as_data;
};
size_t buf_size;
} DataParser;
static inline void data_builder_init(
DataBuilder *b,
uint8_t *buffer,
size_t size) {
assert(size >= sizeof(struct icipc_data));
memset(buffer, 0, size);
b->buffer = buffer;
b->buf_size = size;
b->data->type = DATA_TYPE_STRUCT;
b->ptr = ICIPC_DATA_BODY(b->data);
assert(PTR_IS_ALIGNED(b->ptr));
}
static inline size_t data_type_id_calc_size(void) {
return sizeof(struct icipc_data) + ROUND_UP_TO_ALIGN(sizeof(uint32_t));
}
static inline void data_builder_push_id(DataBuilder *b, uint32_t id) {
const size_t body_size = ROUND_UP_TO_ALIGN(sizeof(uint32_t));
const size_t additional_size = sizeof(struct icipc_data) + body_size;
assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
b->ptr_as_data->size = body_size;
b->ptr_as_data->type = DATA_TYPE_ID;
*((uint32_t *) ICIPC_DATA_BODY(b->ptr)) = id;
b->data->size += additional_size;
b->ptr += additional_size;
assert(PTR_IS_ALIGNED(b->ptr));
}
static inline size_t data_type_string_calc_size(const char *str) {
size_t str_size = strlen(str) + 1;
return sizeof(struct icipc_data) + ROUND_UP_TO_ALIGN(str_size);
}
static inline void data_builder_push_string(DataBuilder *b, const char *str) {
size_t str_size = strlen(str) + 1;
const size_t body_size = ROUND_UP_TO_ALIGN(str_size);
const size_t additional_size = sizeof(struct icipc_data) + body_size;
assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
b->ptr_as_data->size = body_size;
b->ptr_as_data->type = DATA_TYPE_STRING;
strncpy((char *) ICIPC_DATA_BODY(b->ptr), str, str_size);
b->data->size += additional_size;
b->ptr += additional_size;
assert(PTR_IS_ALIGNED(b->ptr));
}
static inline size_t data_type_raw_calc_size(const struct icipc_data *raw) {
return sizeof(struct icipc_data) +
ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(raw));
}
static inline void data_builder_push_raw(
DataBuilder *b,
const struct icipc_data *raw) {
const size_t body_size = ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(raw));
const size_t additional_size = sizeof(struct icipc_data) + body_size;
assert(b->buf_size >= ICIPC_DATA_SIZE(b->data) + additional_size);
b->ptr_as_data->size = body_size;
b->ptr_as_data->type = raw->type;
memcpy(ICIPC_DATA_BODY(b->ptr),
ICIPC_DATA_BODY(raw),
ICIPC_DATA_BODY_SIZE(raw));
b->data->size += additional_size;
b->ptr += additional_size;
assert(PTR_IS_ALIGNED(b->ptr));
}
static inline bool data_parser_init(
DataParser *p,
const uint8_t *buffer,
size_t size) {
assert(size >= sizeof(struct icipc_data));
p->buffer = buffer;
p->buf_size = size;
if (p->data->type != DATA_TYPE_STRUCT ||
ICIPC_DATA_SIZE(p->data) > size)
return false;
p->ptr = ICIPC_DATA_BODY(p->data);
assert(PTR_IS_ALIGNED(p->ptr));
return true;
}
static inline bool data_parser_get_id(DataParser *p, uint32_t *id) {
if (p->ptr_as_data->type != DATA_TYPE_ID ||
ICIPC_DATA_BODY_SIZE(p->ptr) != ROUND_UP_TO_ALIGN(sizeof(uint32_t)))
return false;
*id = *((const uint32_t *) ICIPC_DATA_BODY_CONST(p->ptr));
p->ptr += ICIPC_DATA_SIZE(p->ptr);
assert(PTR_IS_ALIGNED(p->ptr));
return true;
}
static inline bool data_parser_get_string(DataParser *p, const char **str) {
if (p->ptr_as_data->type != DATA_TYPE_STRING ||
ICIPC_DATA_BODY_SIZE(p->ptr) == 0 ||
ICIPC_DATA_BODY_SIZE(p->ptr) !=
ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(p->ptr)) ||
(p->ptr - p->buffer) + ICIPC_DATA_SIZE(p->ptr) > p->buf_size)
return false;
*str = (const char *) ICIPC_DATA_BODY_CONST(p->ptr);
/* check that the string has a terminating null character */
if (strnlen(*str, ICIPC_DATA_BODY_SIZE(p->ptr)) ==
ICIPC_DATA_BODY_SIZE(p->ptr))
return false;
p->ptr += ICIPC_DATA_SIZE(p->ptr);
assert(PTR_IS_ALIGNED(p->ptr));
return true;
}
static inline bool data_parser_get_raw(
DataParser *p,
const struct icipc_data **raw) {
if (ICIPC_DATA_BODY_SIZE(p->ptr) !=
ROUND_UP_TO_ALIGN(ICIPC_DATA_BODY_SIZE(p->ptr)) ||
(p->ptr - p->buffer) + ICIPC_DATA_SIZE(p->ptr) > p->buf_size)
return false;
*raw = p->ptr_as_data;
p->ptr += ICIPC_DATA_SIZE(p->ptr);
assert(PTR_IS_ALIGNED(p->ptr));
return true;
}
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