Move BinaryFeatureExtractor and PEImageReader to common.

chrome/browser/safe_browsing/binary_feature_extractor.cc

-// Copyright 2014 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 "chrome/browser/safe_browsing/binary_feature_extractor.h"
-
-#include "base/files/file.h"
-#include "base/files/file_path.h"
-#include "base/memory/scoped_ptr.h"
-#include "chrome/common/safe_browsing/csd.pb.h"
-#include "crypto/secure_hash.h"
-#include "crypto/sha2.h"
-
-namespace safe_browsing {
-
-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()) {
-    const int kBufferSize = 1 << 12;
-    scoped_ptr<char[]> buf(new char[kBufferSize]);
-    scoped_ptr<crypto::SecureHash> ctx(
-        crypto::SecureHash::Create(crypto::SecureHash::SHA256));
-    int len = 0;
-    while (true) {
-      len = file.ReadAtCurrentPos(buf.get(), kBufferSize);
-      if (len <= 0)
-        break;
-      ctx->Update(buf.get(), len);
-    }
-    if (!len) {
-      uint8_t hash[crypto::kSHA256Length];
-      ctx->Finish(hash, sizeof(hash));
-      digests->set_sha256(hash, sizeof(hash));
-    }
-  }
-}
-
-}  // namespace safe_browsing