blob: 36f7d9039e2603e5216ccddc4ee272504de83465 [file] [log] [blame]
// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chromecast/device/bluetooth/bluetooth_util.h"
#include "base/strings/stringprintf.h"
namespace chromecast {
namespace bluetooth {
namespace util {
namespace {
const int kMacAddrStrLen = 17;
const int kUuid16bitLen = 4;
const int kUuidHexNumChars = 32;
const int kUuidNumDashes = 4;
const char kFmtUuid[] =
"%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx"
"-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx";
const char kFmtUuidNoDashes[] =
"%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx"
"%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx";
const char kFmtAddr[] = "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx";
} // namespace
// https://www.bluetooth.com/specifications/assigned-numbers/service-discovery
const bluetooth_v2_shlib::Uuid kUuidBase = {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x10, 0x00, 0x80, 0x00, 0x00, 0x80,
0x5F, 0x9B, 0x34, 0xFB}};
std::string AddrToString(const bluetooth_v2_shlib::Addr& addr) {
return base::StringPrintf(kFmtAddr, addr[5], addr[4], addr[3], addr[2],
addr[1], addr[0]);
}
std::string AddrLastByteString(const bluetooth_v2_shlib::Addr& addr) {
return base::StringPrintf("%02hhx", addr[0]);
}
bool ParseAddr(const std::string& str, bluetooth_v2_shlib::Addr* addr) {
// sscanf will incorrectly succeed if all characters except the last one are
// correct.
if (str.size() != kMacAddrStrLen || !std::isxdigit(str[str.size() - 1])) {
return false;
}
int ret = sscanf(str.c_str(), kFmtAddr, &(*addr)[5], &(*addr)[4], &(*addr)[3],
&(*addr)[2], &(*addr)[1], &(*addr)[0]);
return ret == static_cast<int>(addr->size());
}
std::string UuidToString(const bluetooth_v2_shlib::Uuid& uuid) {
return base::StringPrintf(kFmtUuid, uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7], uuid[8],
uuid[9], uuid[10], uuid[11], uuid[12], uuid[13],
uuid[14], uuid[15]);
}
bool ParseUuid(const std::string& str, bluetooth_v2_shlib::Uuid* uuid) {
if (str.empty()) {
return false;
}
for (const auto& c : str) {
if (c != '-' && !std::isxdigit(c)) {
return false;
}
}
// Check for 16-bit UUID
if (str.size() == kUuid16bitLen) {
*uuid = kUuidBase;
return sscanf(str.c_str(), "%02hhx%02hhx", &(*uuid)[2], &(*uuid)[3]) == 2;
}
if (str.size() > kUuidHexNumChars &&
str.size() != kUuidHexNumChars + kUuidNumDashes) {
return false;
}
std::string no_dashes = str;
no_dashes.erase(std::remove(no_dashes.begin(), no_dashes.end(), '-'),
no_dashes.end());
if (no_dashes.size() != kUuidHexNumChars) {
return false;
}
int ret =
sscanf(no_dashes.c_str(), kFmtUuidNoDashes, &(*uuid)[0], &(*uuid)[1],
&(*uuid)[2], &(*uuid)[3], &(*uuid)[4], &(*uuid)[5], &(*uuid)[6],
&(*uuid)[7], &(*uuid)[8], &(*uuid)[9], &(*uuid)[10], &(*uuid)[11],
&(*uuid)[12], &(*uuid)[13], &(*uuid)[14], &(*uuid)[15]);
return ret == static_cast<int>(uuid->size());
}
bluetooth_v2_shlib::Uuid UuidFromInt16(uint16_t uuid) {
bluetooth_v2_shlib::Uuid ret = kUuidBase;
ret[2] = (uuid >> 8) & 0xff;
ret[3] = uuid & 0xff;
return ret;
}
bluetooth_v2_shlib::Uuid UuidFromInt32(uint32_t uuid) {
bluetooth_v2_shlib::Uuid ret = kUuidBase;
ret[0] = (uuid >> 24) & 0xff;
ret[1] = (uuid >> 16) & 0xff;
ret[2] = (uuid >> 8) & 0xff;
ret[3] = uuid & 0xff;
return ret;
}
} // namespace util
} // namespace bluetooth
} // namespace chromecast