68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
// Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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//
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#include "system_wrappers/include/field_trial.h"
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#include <stddef.h>
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#include <string>
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// Simple field trial implementation, which allows client to
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// specify desired flags in InitFieldTrialsFromString.
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namespace webrtc {
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namespace field_trial {
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static const char* trials_init_string = NULL;
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#ifndef WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
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std::string FindFullName(const std::string& name) {
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if (trials_init_string == NULL)
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return std::string();
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std::string trials_string(trials_init_string);
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if (trials_string.empty())
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return std::string();
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static const char kPersistentStringSeparator = '/';
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size_t next_item = 0;
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while (next_item < trials_string.length()) {
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// Find next name/value pair in field trial configuration string.
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size_t field_name_end =
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trials_string.find(kPersistentStringSeparator, next_item);
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if (field_name_end == trials_string.npos || field_name_end == next_item)
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break;
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size_t field_value_end =
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trials_string.find(kPersistentStringSeparator, field_name_end + 1);
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if (field_value_end == trials_string.npos ||
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field_value_end == field_name_end + 1)
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break;
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std::string field_name(trials_string, next_item,
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field_name_end - next_item);
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std::string field_value(trials_string, field_name_end + 1,
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field_value_end - field_name_end - 1);
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next_item = field_value_end + 1;
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if (name == field_name)
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return field_value;
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}
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return std::string();
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}
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#endif // WEBRTC_EXCLUDE_FIELD_TRIAL_DEFAULT
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// Optionally initialize field trial from a string.
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void InitFieldTrialsFromString(const char* trials_string) {
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trials_init_string = trials_string;
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}
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const char* GetFieldTrialString() {
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return trials_init_string;
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}
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} // namespace field_trial
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} // namespace webrtc
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