| // Copyright 2016 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <iostream> |
| |
| #include "base/compiler_specific.h" |
| #include "base/containers/span.h" |
| #include "base/hash/hash.h" |
| #include "device/bluetooth/public/cpp/bluetooth_uuid.h" |
| |
| int main(int argc, char** argv) { |
| // SAFETY: The OS guarantees argv length is argc. |
| const base::span<const char* const> args = |
| UNSAFE_BUFFERS(base::span(argv, static_cast<size_t>(argc))); |
| if (args.size() <= 2) { |
| std::cout << "Generates hash values given UUIDs using the same method\n" |
| << "as in bluetooth_metrics.cc.\n" |
| << "\n" |
| << "Output is formatted for including into histograms.xml.\n" |
| << "Note that tools/metrics/histograms/pretty_print.py will\n" |
| << "sort enum entries for you.\n" |
| << "\n" |
| << "Usage: " << args[0] << " <uuid> <label> [uuid2 label2...]\n" |
| << " The UUIDs may be short UUIDs, and will be made\n" |
| << " canonical before being hashed.\n" |
| << "\n" |
| << "Example: " << args[0] << " FEFF foo FEFE bar\n" |
| << " <int value=\"62669585\" " |
| "label=\"foo; 0000feff-0000-1000-8000-00805f9b34fb\"/>\n" |
| << " <int value=\"643543662\" " |
| "label=\"bar; 0000fefe-0000-1000-8000-00805f9b34fb\"/>\n"; |
| return 1; |
| } |
| |
| for (size_t i = 1; i < args.size(); i = i + 2) { |
| std::string uuid_string(args[i]); |
| std::string label_string((i + 1 < args.size()) ? args[i + 1] : ""); |
| device::BluetoothUUID uuid(uuid_string); |
| std::string uuid_canonical_string = uuid.canonical_value(); |
| uint32_t hash = base::PersistentHash(uuid_canonical_string); |
| |
| // Strip off the sign bit because UMA doesn't support negative values, |
| // but takes a signed int as input. |
| hash &= 0x7fffffff; |
| |
| std::cout << " <int value=\"" << hash << "\" label=\"" << label_string |
| << "; " << uuid_canonical_string << "\"/>\n"; |
| } |
| return 0; |
| } |
