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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/common/safe_browsing/binary_feature_extractor.h"
#include <memory>
#include <utility>
#include "base/containers/heap_array.h"
#include "base/files/file.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/memory_mapped_file.h"
#include "base/metrics/histogram_functions.h"
#include "components/safe_browsing/core/common/proto/csd.pb.h"
#include "crypto/hash.h"
namespace safe_browsing {
BinaryFeatureExtractor::BinaryFeatureExtractor() = default;
BinaryFeatureExtractor::~BinaryFeatureExtractor() = default;
bool BinaryFeatureExtractor::ExtractImageFeatures(
const base::FilePath& file_path,
ExtractHeadersOption options,
ClientDownloadRequest_ImageHeaders* image_headers,
google::protobuf::RepeatedPtrField<std::string>* signed_data) {
base::FilePath temp_path;
if (!base::CreateTemporaryFile(&temp_path)) {
return false;
}
if (!base::CopyFile(file_path, temp_path)) {
base::DeleteFile(temp_path);
return false;
}
base::File temp_file;
temp_file.Initialize(temp_path, base::File::FLAG_OPEN |
base::File::FLAG_READ |
base::File::FLAG_WIN_TEMPORARY |
base::File::FLAG_DELETE_ON_CLOSE);
base::MemoryMappedFile mapped_file;
if (!mapped_file.Initialize(std::move(temp_file))) {
return false;
}
return ExtractImageFeaturesFromData(mapped_file.bytes(), options,
image_headers, signed_data);
}
bool BinaryFeatureExtractor::ExtractImageFeaturesFromFile(
base::File file,
ExtractHeadersOption options,
ClientDownloadRequest_ImageHeaders* image_headers,
google::protobuf::RepeatedPtrField<std::string>* signed_data) {
base::MemoryMappedFile mapped_file;
if (!mapped_file.Initialize(std::move(file)))
return false;
return ExtractImageFeaturesFromData(mapped_file.bytes(), options,
image_headers, signed_data);
}
void BinaryFeatureExtractor::ExtractDigest(
const base::FilePath& file_path,
ClientDownloadRequest_Digests* digests) {
base::File file(file_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
if (file.IsValid()) {
auto buf = base::HeapArray<uint8_t>::Uninit(1 << 12);
crypto::hash::Hasher hasher(crypto::hash::HashKind::kSha256);
std::optional<size_t> result;
while (true) {
result = file.ReadAtCurrentPos(buf);
if (!result.has_value() || result.value() == 0) {
break;
}
hasher.Update(buf.first(*result));
}
// The loop was broken out of because of EOF, not an error.
if (result.has_value() && result.value() == 0) {
std::array<uint8_t, crypto::hash::kSha256Size> hash;
hasher.Finish(hash);
digests->set_sha256(base::as_string_view(hash));
}
}
}
} // namespace safe_browsing
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