1 /* 2 * Copyright (C) 2024 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "hci_event_builder.c" 39 40 #include "hci_event_builder.h" 41 42 #include "btstack_debug.h" 43 #include "btstack_util.h" 44 45 #include <stdint.h> 46 #include <stddef.h> 47 48 static void hci_event_builder_increment_pos(hci_event_builder_context_t * context, uint16_t size){ 49 btstack_assert((context->pos + size) <= context->size); 50 context->pos += size; 51 context->buffer[1] = (uint8_t) (context->pos - 2); 52 } 53 54 void hci_event_builder_init(hci_event_builder_context_t * context, uint8_t * buffer, uint16_t size, uint8_t event_type, uint8_t subevent_type){ 55 uint16_t subevent_overhead = subevent_type == 0 ? 0 : 1; 56 btstack_assert(buffer != NULL); 57 btstack_assert(size + subevent_overhead >= 2); 58 context->buffer = buffer; 59 context->size = size; 60 context->pos = 0; 61 hci_event_builder_add_08(context, event_type); 62 context->pos += 1; 63 if (subevent_type != 0){ 64 hci_event_builder_add_08(context, subevent_type); 65 } 66 } 67 68 uint16_t hci_event_builder_remaining_space(hci_event_builder_context_t * context){ 69 return context->size - context->pos; 70 } 71 72 uint16_t hci_event_builder_get_length(hci_event_builder_context_t * context){ 73 return context->pos; 74 } 75 76 void hci_event_builder_add_08(hci_event_builder_context_t * context, uint8_t value){ 77 uint16_t pos = context->pos; 78 hci_event_builder_increment_pos(context, 1); 79 context->buffer[pos] = value; 80 } 81 82 void hci_event_builder_add_16(hci_event_builder_context_t * context, uint16_t value){ 83 uint16_t pos = context->pos; 84 hci_event_builder_increment_pos(context, 2); 85 little_endian_store_16(context->buffer, pos, value); 86 } 87 88 void hci_event_builder_add_24(hci_event_builder_context_t * context, uint32_t value){ 89 uint16_t pos = context->pos; 90 hci_event_builder_increment_pos(context, 3); 91 little_endian_store_24(context->buffer, pos, value); 92 } 93 94 void hci_event_builder_add_32(hci_event_builder_context_t * context, uint32_t value){ 95 uint16_t pos = context->pos; 96 hci_event_builder_increment_pos(context, 4); 97 little_endian_store_32(context->buffer, pos, value); 98 } 99 100 void hci_event_builder_add_64(hci_event_builder_context_t * context, const uint8_t * value){ 101 uint16_t pos = context->pos; 102 hci_event_builder_increment_pos(context, 8); 103 reverse_64(value, &context->buffer[pos]); 104 } 105 106 void hci_event_builder_add_128(hci_event_builder_context_t * context, const uint8_t * value){ 107 uint16_t pos = context->pos; 108 hci_event_builder_increment_pos(context, 16); 109 reverse_128(value, &context->buffer[pos]); 110 } 111 112 void hci_event_builder_add_bd_addr(hci_event_builder_context_t * context, bd_addr_t addr){ 113 uint16_t pos = context->pos; 114 hci_event_builder_increment_pos(context, 6); 115 reverse_bd_addr(addr, &context->buffer[pos]); 116 } 117 118 void hci_event_builder_add_con_handle(hci_event_builder_context_t * context, hci_con_handle_t con_handle){ 119 hci_event_builder_add_16(context, (uint16_t) con_handle); 120 } 121 122 void hci_event_builder_add_string(hci_event_builder_context_t * context, const char * text){ 123 uint16_t length = (uint16_t) strlen(text); 124 uint16_t pos = context->pos; 125 hci_event_builder_increment_pos(context, length); 126 memcpy(&context->buffer[pos], text, length); 127 } 128 129 void hci_event_builder_add_bytes(hci_event_builder_context_t * context, const uint8_t * data, uint16_t length){ 130 uint16_t pos = context->pos; 131 hci_event_builder_increment_pos(context, length); 132 memcpy(&context->buffer[pos], data, length); 133 } 134