1 /* 2 * Copyright (C) 2014 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 MATTHIAS 24 * RINGWALD 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 /* 39 * btstack_util.c 40 * 41 * General utility functions 42 * 43 * Created by Matthias Ringwald on 7/23/09. 44 */ 45 46 #include "btstack_config.h" 47 #include "btstack_debug.h" 48 #include "btstack_util.h" 49 50 #include <stdio.h> 51 #include <string.h> 52 53 /** 54 * @brief Compare two Bluetooth addresses 55 * @param a 56 * @param b 57 * @return 0 if equal 58 */ 59 int bd_addr_cmp(bd_addr_t a, bd_addr_t b){ 60 return memcmp(a,b, BD_ADDR_LEN); 61 } 62 63 /** 64 * @brief Copy Bluetooth address 65 * @param dest 66 * @param src 67 */ 68 void bd_addr_copy(bd_addr_t dest, bd_addr_t src){ 69 memcpy(dest,src,BD_ADDR_LEN); 70 } 71 72 uint16_t little_endian_read_16(const uint8_t * buffer, int pos){ 73 return ((uint16_t) buffer[pos]) | (((uint16_t)buffer[(pos)+1]) << 8); 74 } 75 uint32_t little_endian_read_24(const uint8_t * buffer, int pos){ 76 return ((uint32_t) buffer[pos]) | (((uint32_t)buffer[(pos)+1]) << 8) | (((uint32_t)buffer[(pos)+2]) << 16); 77 } 78 uint32_t little_endian_read_32(const uint8_t * buffer, int pos){ 79 return ((uint32_t) buffer[pos]) | (((uint32_t)buffer[(pos)+1]) << 8) | (((uint32_t)buffer[(pos)+2]) << 16) | (((uint32_t) buffer[(pos)+3]) << 24); 80 } 81 82 void little_endian_store_16(uint8_t *buffer, uint16_t pos, uint16_t value){ 83 buffer[pos++] = value; 84 buffer[pos++] = value >> 8; 85 } 86 87 void little_endian_store_32(uint8_t *buffer, uint16_t pos, uint32_t value){ 88 buffer[pos++] = value; 89 buffer[pos++] = value >> 8; 90 buffer[pos++] = value >> 16; 91 buffer[pos++] = value >> 24; 92 } 93 94 uint32_t big_endian_read_16( const uint8_t * buffer, int pos) { 95 return ((uint16_t) buffer[(pos)+1]) | (((uint16_t)buffer[ pos ]) << 8); 96 } 97 98 uint32_t big_endian_read_32( const uint8_t * buffer, int pos) { 99 return ((uint32_t) buffer[(pos)+3]) | (((uint32_t)buffer[(pos)+2]) << 8) | (((uint32_t)buffer[(pos)+1]) << 16) | (((uint32_t) buffer[pos]) << 24); 100 } 101 102 void big_endian_store_16(uint8_t *buffer, uint16_t pos, uint16_t value){ 103 buffer[pos++] = value >> 8; 104 buffer[pos++] = value; 105 } 106 107 void big_endian_store_32(uint8_t *buffer, uint16_t pos, uint32_t value){ 108 buffer[pos++] = value >> 24; 109 buffer[pos++] = value >> 16; 110 buffer[pos++] = value >> 8; 111 buffer[pos++] = value; 112 } 113 114 // general swap/endianess utils 115 void reverse_bytes(const uint8_t *src, uint8_t *dst, int len){ 116 int i; 117 for (i = 0; i < len; i++) 118 dst[len - 1 - i] = src[i]; 119 } 120 void reverse_24(const uint8_t * src, uint8_t * dst){ 121 reverse_bytes(src, dst, 3); 122 } 123 void reverse_48(const uint8_t * src, uint8_t * dst){ 124 reverse_bytes(src, dst, 6); 125 } 126 void reverse_56(const uint8_t * src, uint8_t * dst){ 127 reverse_bytes(src, dst, 7); 128 } 129 void reverse_64(const uint8_t * src, uint8_t * dst){ 130 reverse_bytes(src, dst, 8); 131 } 132 void reverse_128(const uint8_t * src, uint8_t * dst){ 133 reverse_bytes(src, dst, 16); 134 } 135 void reverse_256(const uint8_t * src, uint8_t * dst){ 136 reverse_bytes(src, dst, 32); 137 } 138 139 void reverse_bd_addr(const bd_addr_t src, bd_addr_t dest){ 140 reverse_bytes(src, dest, 6); 141 } 142 143 uint32_t btstack_min(uint32_t a, uint32_t b){ 144 return a < b ? a : b; 145 } 146 147 uint32_t btstack_max(uint32_t a, uint32_t b){ 148 return a > b ? a : b; 149 } 150 151 char char_for_nibble(int nibble){ 152 if (nibble < 10) return '0' + nibble; 153 nibble -= 10; 154 if (nibble < 6) return 'A' + nibble; 155 return '?'; 156 } 157 158 static inline char char_for_high_nibble(int value){ 159 return char_for_nibble((value >> 4) & 0x0f); 160 } 161 162 static inline char char_for_low_nibble(int value){ 163 return char_for_nibble(value & 0x0f); 164 } 165 166 int nibble_for_char(char c){ 167 if (c >= '0' && c <= '9') return c - '0'; 168 if (c >= 'a' && c <= 'f') return c - 'a' + 10; 169 if (c >= 'A' && c <= 'F') return c - 'A' + 10; 170 return -1; 171 } 172 173 void printf_hexdump(const void *data, int size){ 174 if (size <= 0) return; 175 int i; 176 for (i=0; i<size;i++){ 177 printf("%02X ", ((uint8_t *)data)[i]); 178 } 179 printf("\n"); 180 } 181 182 void log_info_hexdump(const void *data, int size){ 183 #ifdef ENABLE_LOG_INFO 184 185 #define ITEMS_PER_LINE 16 186 // template '0x12, ' 187 #define BYTES_PER_BYTE 6 188 189 char buffer[BYTES_PER_BYTE*ITEMS_PER_LINE+1]; 190 int i, j; 191 j = 0; 192 for (i=0; i<size;i++){ 193 194 // help static analyzer proof that j stays within bounds 195 if (j > BYTES_PER_BYTE * (ITEMS_PER_LINE-1)){ 196 j = 0; 197 } 198 199 uint8_t byte = ((uint8_t *)data)[i]; 200 buffer[j++] = '0'; 201 buffer[j++] = 'x'; 202 buffer[j++] = char_for_high_nibble(byte); 203 buffer[j++] = char_for_low_nibble(byte); 204 buffer[j++] = ','; 205 buffer[j++] = ' '; 206 207 if (j >= BYTES_PER_BYTE * ITEMS_PER_LINE ){ 208 buffer[j] = 0; 209 log_info("%s", buffer); 210 j = 0; 211 } 212 } 213 if (j != 0){ 214 buffer[j] = 0; 215 log_info("%s", buffer); 216 } 217 #endif 218 } 219 220 void log_info_key(const char * name, sm_key_t key){ 221 #ifdef ENABLE_LOG_INFO 222 char buffer[16*2+1]; 223 int i; 224 int j = 0; 225 for (i=0; i<16;i++){ 226 uint8_t byte = key[i]; 227 buffer[j++] = char_for_high_nibble(byte); 228 buffer[j++] = char_for_low_nibble(byte); 229 } 230 buffer[j] = 0; 231 log_info("%-6s %s", name, buffer); 232 #endif 233 } 234 235 // UUIDs are stored in big endian, similar to bd_addr_t 236 237 // Bluetooth Base UUID: 00000000-0000-1000-8000- 00805F9B34FB 238 const uint8_t bluetooth_base_uuid[] = { 0x00, 0x00, 0x00, 0x00, /* - */ 0x00, 0x00, /* - */ 0x10, 0x00, /* - */ 239 0x80, 0x00, /* - */ 0x00, 0x80, 0x5F, 0x9B, 0x34, 0xFB }; 240 241 void uuid_add_bluetooth_prefix(uint8_t *uuid, uint32_t shortUUID){ 242 memcpy(uuid, bluetooth_base_uuid, 16); 243 big_endian_store_32(uuid, 0, shortUUID); 244 } 245 246 int uuid_has_bluetooth_prefix(uint8_t * uuid128){ 247 return memcmp(&uuid128[4], &bluetooth_base_uuid[4], 12) == 0; 248 } 249 250 static char uuid128_to_str_buffer[32+4+1]; 251 char * uuid128_to_str(uint8_t * uuid){ 252 int i; 253 int j = 0; 254 // after 4, 6, 8, and 10 bytes = XYXYXYXY-XYXY-XYXY-XYXY-XYXYXYXYXYXY, there's a dash 255 const int dash_locations = (1<<3) | (1<<5) | (1<<7) | (1<<9); 256 for (i=0;i<16;i++){ 257 uint8_t byte = uuid[i]; 258 uuid128_to_str_buffer[j++] = char_for_high_nibble(byte); 259 uuid128_to_str_buffer[j++] = char_for_low_nibble(byte); 260 if (dash_locations & (1<<i)){ 261 uuid128_to_str_buffer[j++] = '-'; 262 } 263 } 264 return uuid128_to_str_buffer; 265 } 266 267 static char bd_addr_to_str_buffer[6*3]; // 12:45:78:01:34:67\0 268 char * bd_addr_to_str(bd_addr_t addr){ 269 // orig code 270 // sprintf(bd_addr_to_str_buffer, "%02x:%02x:%02x:%02x:%02x:%02x", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]); 271 // sprintf-free code 272 char * p = bd_addr_to_str_buffer; 273 int i; 274 for (i = 0; i < 6 ; i++) { 275 uint8_t byte = addr[i]; 276 *p++ = char_for_high_nibble(byte); 277 *p++ = char_for_low_nibble(byte); 278 *p++ = ':'; 279 } 280 *--p = 0; 281 return (char *) bd_addr_to_str_buffer; 282 } 283 284 static int scan_hex_byte(const char * byte_string){ 285 int upper_nibble = nibble_for_char(*byte_string++); 286 if (upper_nibble < 0) return -1; 287 int lower_nibble = nibble_for_char(*byte_string); 288 if (lower_nibble < 0) return -1; 289 return (upper_nibble << 4) | lower_nibble; 290 } 291 292 int sscanf_bd_addr(const char * addr_string, bd_addr_t addr){ 293 uint8_t buffer[BD_ADDR_LEN]; 294 int result = 0; 295 int i; 296 for (i = 0; i < BD_ADDR_LEN; i++) { 297 int single_byte = scan_hex_byte(addr_string); 298 if (single_byte < 0) break; 299 addr_string += 2; 300 buffer[i] = single_byte; 301 // don't check seperator after last byte 302 if (i == BD_ADDR_LEN - 1) { 303 result = 1; 304 break; 305 } 306 char separator = *addr_string++; 307 if (separator != ':' && separator != '-' && separator != ' ') break; 308 } 309 310 if (result){ 311 bd_addr_copy(addr, buffer); 312 } 313 return result; 314 } 315