132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/* Copyright 2021 Nick Brassel (@tzarc)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <quantum.h>
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#include <xap.h>
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#include "info_json_gz.h"
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bool get_info_json_chunk(uint16_t offset, uint8_t *data, uint8_t data_len) {
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if (offset + data_len > info_json_gz_len) {
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data_len = info_json_gz_len - offset;
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}
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memcpy_P(data, &info_json_gz[offset], data_len);
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return true;
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}
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uint8_t secure_status = 2;
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#define QSTR2(z) #z
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#define QSTR(z) QSTR2(z)
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typedef enum xap_route_type_t {
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XAP_UNUSED = 0, // "Unused" needs to be zero -- undefined routes (through preprocessor) will be skipped
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XAP_ROUTE,
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XAP_EXECUTE,
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XAP_VALUE,
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XAP_GETTER,
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XAP_CONST_MEM,
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TOTAL_XAP_ROUTE_TYPES
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} xap_route_type_t;
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#define XAP_ROUTE_TYPE_BIT_COUNT 3
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typedef struct __attribute__((packed)) xap_route_flags_t {
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xap_route_type_t type : XAP_ROUTE_TYPE_BIT_COUNT;
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uint8_t is_secure : 1;
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} xap_route_flags_t;
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_Static_assert(TOTAL_XAP_ROUTE_TYPES <= (1 << (XAP_ROUTE_TYPE_BIT_COUNT)), "Number of XAP route types is too large for XAP_ROUTE_TYPE_BITS.");
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_Static_assert(sizeof(xap_route_flags_t) == 1, "xap_route_flags_t is not length of 1");
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typedef struct xap_route_t xap_route_t;
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struct __attribute__((packed)) xap_route_t {
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const xap_route_flags_t flags;
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union {
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// XAP_ROUTE
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struct {
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const xap_route_t *child_routes;
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const uint8_t child_routes_len;
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};
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// XAP_EXECUTE
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bool (*handler)(xap_token_t token, const uint8_t *data, size_t data_len);
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// XAP_GETTER
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uint32_t (*u32getter)(void);
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// XAP_VALUE / XAP_CONST_MEM
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struct {
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const void * const_data;
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const uint8_t const_data_len;
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};
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};
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};
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#include <xap_generated.inl>
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void xap_execute_route(xap_token_t token, const xap_route_t *routes, size_t max_routes, const uint8_t *data, size_t data_len) {
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if (data_len == 0) return;
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xap_identifier_t id = data[0];
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if (id < max_routes) {
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xap_route_t route;
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memcpy_P(&route, &routes[id], sizeof(xap_route_t));
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if (route.flags.is_secure && secure_status != 2) {
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xap_respond_failure(token, XAP_RESPONSE_FLAG_SECURE_FAILURE);
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return;
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}
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switch (route.flags.type) {
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case XAP_ROUTE:
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if (route.child_routes != NULL && route.child_routes_len > 0 && data_len > 0) {
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xap_execute_route(token, route.child_routes, route.child_routes_len, &data[1], data_len - 1);
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return;
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}
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break;
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case XAP_EXECUTE:
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if (route.handler != NULL) {
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bool ok = (route.handler)(token, data_len == 1 ? NULL : &data[1], data_len - 1);
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if (ok) return;
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}
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break;
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case XAP_GETTER:
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xap_respond_u32(token, (route.u32getter)());
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return;
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case XAP_VALUE:
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xap_respond_data(token, route.const_data, route.const_data_len);
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return;
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case XAP_CONST_MEM:
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xap_respond_data_P(token, route.const_data, route.const_data_len);
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return;
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default:
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break;
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}
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}
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// Nothing got handled, so we respond with failure.
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xap_respond_failure(token, XAP_RESPONSE_FLAG_FAILED);
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}
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void xap_receive(xap_token_t token, const uint8_t *data, size_t length) {
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xap_execute_route(token, xap_route_table, sizeof(xap_route_table) / sizeof(xap_route_t), data, length);
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}
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