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// Copyright 2017 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 "components/zucchini/ensemble_matcher.h"
#include <algorithm>
#include <limits>
#include "base/containers/cxx20_erase.h"
#include "base/logging.h"
namespace zucchini {
/******** EnsembleMatcher ********/
EnsembleMatcher::EnsembleMatcher() = default;
EnsembleMatcher::~EnsembleMatcher() = default;
void EnsembleMatcher::Trim() {
// Trim rule: If > 1 DEX files are found then ignore all DEX. This is done
// because we do not yet support MultiDex, under which contents can move
// across file boundary between "old" and "new" archives. When this occurs,
// forcing matches of DEX files and patching them separately can result in
// larger patches than naive patching.
auto is_match_dex = [](const ElementMatch& match) {
return match.exe_type() == kExeTypeDex;
};
auto num_dex = std::count_if(matches_.begin(), matches_.end(), is_match_dex);
if (num_dex > 1) {
LOG(WARNING) << "Found " << num_dex << " DEX: Ignoring all.";
base::EraseIf(matches_, is_match_dex);
}
}
} // namespace zucchini
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