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// 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;
}
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