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/* PipeWire AGL Cluster IPC
*
* Copyright © 2021 Collabora Ltd.
* @author Julian Bouzas <julian.bouzas@collabora.com>
*
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include <spa/pod/builder.h>
#include <spa/pod/parser.h>
#include "protocol.h"
#define SIZE_PADDING 128
enum {
REPLY_CODE_ERROR = 0,
REPLY_CODE_OK,
};
static bool is_reply(const uint8_t *buffer, size_t size, int code) {
const struct spa_pod *pod = (const struct spa_pod *)buffer;
struct spa_pod_parser p;
struct spa_pod_frame f;
int parsed_code = 0;
/* check if struct */
if (!spa_pod_is_struct(pod))
return false;
/* parse */
spa_pod_parser_pod(&p, pod);
spa_pod_parser_push_struct(&p, &f);
spa_pod_parser_get_int(&p, &parsed_code);
return parsed_code == code;
}
/* API */
size_t icipc_protocol_calculate_request_size(
const char *name,
const struct spa_pod *args) {
assert (name);
return strlen(name) + (args ? SPA_POD_SIZE(args) : 8) + SIZE_PADDING;
}
void icipc_protocol_build_request(
uint8_t *buffer,
size_t size,
const char *name,
const struct spa_pod *args) {
const struct spa_pod none = SPA_POD_INIT_None();
struct spa_pod_builder b;
struct spa_pod_frame f;
memset(buffer, 0, size);
if (args == NULL)
args = &none;
spa_pod_builder_init(&b, buffer, size);
spa_pod_builder_push_struct(&b, &f);
spa_pod_builder_string(&b, name);
spa_pod_builder_primitive (&b, args);
spa_pod_builder_pop(&b, &f);
}
bool icipc_protocol_parse_request(
const uint8_t *buffer,
size_t size,
const char **name,
const struct spa_pod **args) {
const struct spa_pod *pod = (const struct spa_pod *)buffer;
struct spa_pod_parser p;
struct spa_pod_frame f;
const char *parsed_name = NULL;
struct spa_pod *parsed_args = NULL;
/* check if struct */
if (!spa_pod_is_struct(pod))
return false;
/* parse */
spa_pod_parser_pod(&p, pod);
spa_pod_parser_push_struct(&p, &f);
spa_pod_parser_get_string(&p, &parsed_name);
spa_pod_parser_get_pod(&p, &parsed_args);
spa_pod_parser_pop(&p, &f);
/* check name and args */
if (name == NULL || args == NULL)
return false;
if (name != NULL)
*name = parsed_name;
if (args != NULL)
*args = parsed_args;
return true;
}
size_t icipc_protocol_calculate_reply_ok_size(const struct spa_pod *value) {
return (value ? SPA_POD_SIZE(value) : 8) + SIZE_PADDING;
}
size_t icipc_protocol_calculate_reply_error_size(const char *msg) {
assert (msg);
return strlen(msg) + SIZE_PADDING;
}
void icipc_protocol_build_reply_ok(
uint8_t *buffer,
size_t size,
const struct spa_pod *value) {
const struct spa_pod none = SPA_POD_INIT_None();
struct spa_pod_builder b;
struct spa_pod_frame f;
memset(buffer, 0, size);
if (value == NULL)
value = &none;
spa_pod_builder_init(&b, buffer, size);
spa_pod_builder_push_struct(&b, &f);
spa_pod_builder_int(&b, REPLY_CODE_OK);
spa_pod_builder_primitive(&b, value);
spa_pod_builder_pop(&b, &f);
}
void icipc_protocol_build_reply_error(
uint8_t *buffer,
size_t size,
const char *msg) {
struct spa_pod_builder b;
struct spa_pod_frame f;
memset(buffer, 0, size);
spa_pod_builder_init(&b, buffer, size);
spa_pod_builder_push_struct(&b, &f);
spa_pod_builder_int(&b, REPLY_CODE_ERROR);
spa_pod_builder_string (&b, msg);
spa_pod_builder_pop(&b, &f);
}
bool icipc_protocol_is_reply_ok(const uint8_t *buffer, size_t size) {
return is_reply (buffer, size, REPLY_CODE_OK);
}
bool icipc_protocol_is_reply_error(const uint8_t *buffer, size_t size) {
return is_reply (buffer, size, REPLY_CODE_ERROR);
}
bool icipc_protocol_parse_reply_ok (
const uint8_t *buffer,
size_t size,
const struct spa_pod **value) {
const struct spa_pod *pod = (const struct spa_pod *)buffer;
struct spa_pod_parser p;
struct spa_pod_frame f;
int parsed_code = 0;
struct spa_pod *parsed_value = NULL;
/* check if struct */
if (!spa_pod_is_struct(pod))
return false;
/* parse */
spa_pod_parser_pod(&p, pod);
spa_pod_parser_push_struct(&p, &f);
spa_pod_parser_get_int(&p, &parsed_code);
spa_pod_parser_get_pod(&p, &parsed_value);
spa_pod_parser_pop(&p, &f);
if (value != NULL)
*value = parsed_value;
return true;
}
bool icipc_protocol_parse_reply_error (
const uint8_t *buffer,
size_t size,
const char **msg) {
const struct spa_pod *pod = (const struct spa_pod *)buffer;
struct spa_pod_parser p;
struct spa_pod_frame f;
int parsed_code = 0;
const char *parsed_msg = NULL;
/* check if struct */
if (!spa_pod_is_struct(pod))
return false;
/* parse */
spa_pod_parser_pod(&p, pod);
spa_pod_parser_push_struct(&p, &f);
spa_pod_parser_get_int(&p, &parsed_code);
spa_pod_parser_get_string(&p, &parsed_msg);
spa_pod_parser_pop(&p, &f);
if (msg != NULL)
*msg = parsed_msg;
return true;
}
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