1/****************************************************************************** 2 * 3 * Copyright (C) 2014 Google, Inc. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ******************************************************************************/ 18 19#include "btcore/include/property.h" 20#include <base/logging.h> 21#include <string.h> 22#include "btcore/include/bdaddr.h" 23#include "btcore/include/device_class.h" 24#include "btcore/include/uuid.h" 25#include "osi/include/allocator.h" 26 27static bt_property_t* property_new_(void* val, size_t len, 28 bt_property_type_t type); 29 30bt_property_t* property_copy_array(const bt_property_t* properties, 31 size_t count) { 32 CHECK(properties != NULL); 33 bt_property_t* clone = 34 static_cast<bt_property_t*>(osi_calloc(sizeof(bt_property_t) * count)); 35 36 memcpy(&clone[0], &properties[0], sizeof(bt_property_t) * count); 37 for (size_t i = 0; i < count; ++i) { 38 clone[i].val = osi_calloc(clone[i].len); 39 memcpy(clone[i].val, properties[i].val, clone[i].len); 40 } 41 42 return clone; 43} 44 45bt_property_t* property_copy(bt_property_t* dest, const bt_property_t* src) { 46 CHECK(dest != NULL); 47 CHECK(src != NULL); 48 return (bt_property_t*)memcpy(dest, src, sizeof(bt_property_t)); 49} 50 51bool property_equals(const bt_property_t* p1, const bt_property_t* p2) { 52 // Two null properties are not the same. May need to revisit that 53 // decision when we have a test case that exercises that condition. 54 if (!p1 || !p2 || p1->type != p2->type) { 55 return false; 56 } 57 58 // Although the Bluetooth name is a 249-byte array, the implementation 59 // treats it like a variable-length array with its size specified in the 60 // property's `len` field. We special-case the equivalence of BDNAME 61 // types here by truncating the larger, zero-padded name to its string 62 // length and comparing against the shorter name. 63 // 64 // Note: it may be the case that both strings are zero-padded but that 65 // hasn't come up yet so this implementation doesn't handle it. 66 if (p1->type == BT_PROPERTY_BDNAME && p1->len != p2->len) { 67 const bt_property_t *shorter = p1, *longer = p2; 68 if (p1->len > p2->len) { 69 shorter = p2; 70 longer = p1; 71 } 72 return strlen((const char*)longer->val) == (size_t)shorter->len && 73 !memcmp(longer->val, shorter->val, shorter->len); 74 } 75 76 return p1->len == p2->len && !memcmp(p1->val, p2->val, p1->len); 77} 78 79bt_property_t* property_new_addr(const bt_bdaddr_t* addr) { 80 CHECK(addr != NULL); 81 return property_new_((void*)addr, sizeof(bt_bdaddr_t), BT_PROPERTY_BDADDR); 82} 83 84bt_property_t* property_new_device_class(const bt_device_class_t* dc) { 85 CHECK(dc != NULL); 86 return property_new_((void*)dc, sizeof(bt_device_class_t), 87 BT_PROPERTY_CLASS_OF_DEVICE); 88} 89 90bt_property_t* property_new_device_type(bt_device_type_t type) { 91 return property_new_((void*)&type, sizeof(bt_device_type_t), 92 BT_PROPERTY_TYPE_OF_DEVICE); 93} 94 95bt_property_t* property_new_discovery_timeout(const uint32_t timeout) { 96 return property_new_((void*)&timeout, sizeof(uint32_t), 97 BT_PROPERTY_ADAPTER_DISCOVERY_TIMEOUT); 98} 99 100bt_property_t* property_new_name(const char* name) { 101 CHECK(name != NULL); 102 return property_new_((void*)name, sizeof(bt_bdname_t), BT_PROPERTY_BDNAME); 103} 104 105bt_property_t* property_new_rssi(int8_t rssi) { 106 return property_new_((void*)&rssi, sizeof(int8_t), BT_PROPERTY_REMOTE_RSSI); 107} 108 109bt_property_t* property_new_scan_mode(bt_scan_mode_t scan_mode) { 110 return property_new_((void*)&scan_mode, sizeof(bt_scan_mode_t), 111 BT_PROPERTY_ADAPTER_SCAN_MODE); 112} 113 114bt_property_t* property_new_uuids(const bt_uuid_t* uuid, size_t count) { 115 CHECK(uuid != NULL); 116 return property_new_((void*)uuid, sizeof(bt_uuid_t) * count, 117 BT_PROPERTY_UUIDS); 118} 119 120void property_free(bt_property_t* property) { 121 property_free_array(property, 1); 122} 123 124void property_free_array(bt_property_t* properties, size_t count) { 125 if (properties == NULL) return; 126 127 for (size_t i = 0; i < count; ++i) { 128 osi_free(properties[i].val); 129 } 130 131 osi_free(properties); 132} 133 134bool property_is_addr(const bt_property_t* property) { 135 CHECK(property != NULL); 136 return property->type == BT_PROPERTY_BDADDR; 137} 138 139bool property_is_device_class(const bt_property_t* property) { 140 CHECK(property != NULL); 141 return property->type == BT_PROPERTY_CLASS_OF_DEVICE; 142} 143 144bool property_is_device_type(const bt_property_t* property) { 145 CHECK(property != NULL); 146 return property->type == BT_PROPERTY_TYPE_OF_DEVICE; 147} 148 149bool property_is_discovery_timeout(const bt_property_t* property) { 150 CHECK(property != NULL); 151 return property->type == BT_PROPERTY_ADAPTER_DISCOVERY_TIMEOUT; 152} 153 154bool property_is_name(const bt_property_t* property) { 155 CHECK(property != NULL); 156 return property->type == BT_PROPERTY_BDNAME; 157} 158 159bool property_is_rssi(const bt_property_t* property) { 160 CHECK(property != NULL); 161 return property->type == BT_PROPERTY_REMOTE_RSSI; 162} 163 164bool property_is_scan_mode(const bt_property_t* property) { 165 CHECK(property != NULL); 166 return property->type == BT_PROPERTY_ADAPTER_SCAN_MODE; 167} 168 169bool property_is_uuids(const bt_property_t* property) { 170 CHECK(property != NULL); 171 return property->type == BT_PROPERTY_UUIDS; 172} 173 174// Convenience conversion methods to property values 175const bt_bdaddr_t* property_as_addr(const bt_property_t* property) { 176 CHECK(property_is_addr(property)); 177 return (const bt_bdaddr_t*)property->val; 178} 179 180const bt_device_class_t* property_as_device_class( 181 const bt_property_t* property) { 182 CHECK(property_is_device_class(property)); 183 return (const bt_device_class_t*)property->val; 184} 185 186bt_device_type_t property_as_device_type(const bt_property_t* property) { 187 CHECK(property_is_device_type(property)); 188 return *(const bt_device_type_t*)property->val; 189} 190 191uint32_t property_as_discovery_timeout(const bt_property_t* property) { 192 CHECK(property_is_discovery_timeout(property)); 193 return *(const uint32_t*)property->val; 194} 195 196const bt_bdname_t* property_as_name(const bt_property_t* property) { 197 CHECK(property_is_name(property)); 198 return (const bt_bdname_t*)property->val; 199} 200 201int8_t property_as_rssi(const bt_property_t* property) { 202 CHECK(property_is_rssi(property)); 203 return *(const int8_t*)property->val; 204} 205 206bt_scan_mode_t property_as_scan_mode(const bt_property_t* property) { 207 CHECK(property_is_scan_mode(property)); 208 return *(const bt_scan_mode_t*)property->val; 209} 210 211const bt_uuid_t* property_as_uuids(const bt_property_t* property, 212 size_t* count) { 213 CHECK(property_is_uuids(property)); 214 *count = sizeof(bt_uuid_t) / property->len; 215 return (const bt_uuid_t*)property->val; 216} 217 218static bt_property_t* property_new_(void* val, size_t len, 219 bt_property_type_t type) { 220 bt_property_t* property = 221 static_cast<bt_property_t*>(osi_calloc(sizeof(bt_property_t))); 222 223 property->val = osi_malloc(len); 224 memcpy(property->val, val, len); 225 226 property->type = type; 227 property->len = len; 228 229 return property; 230} 231