[Courgette] Refactor BSDiff namespaces and bsdiff::search() interface.

courgette/third_party/bsdiff/bsdiff_apply.cc

-/*-
- * Copyright 2003,2004 Colin Percival
- * All rights reserved
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted providing that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
- * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * Changelog:
- * 2009-03-31 - Change to use Streams.  Move CRC code to crc.{h,cc}
- *                --Stephen Adams <sra@chromium.org>
- * 2013-04-10 - Add wrapper method to apply a patch to files directly.
- *                --Joshua Pawlicki <waffles@chromium.org>
- */
+// Copyright 2003, 2004 Colin Percival
+// All rights reserved
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted providing that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//
+// For the terms under which this work may be distributed, please see
+// the adjoining file "LICENSE".
+//
+// bsdiff_apply.c -- Binary patch applier.
+//
+// Changelog:
+// 2009-03-31 - Change to use Streams.  Move CRC code to crc.{h,cc}
+//                --Stephen Adams <sra@chromium.org>
+// 2013-04-10 - Add wrapper method to apply a patch to files directly.
+//                --Joshua Pawlicki <waffles@chromium.org>
 
 // Copyright (c) 2009 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 "courgette/third_party/bsdiff/bsdiff.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/files/memory_mapped_file.h"
 #include "courgette/crc.h"
 #include "courgette/streams.h"
 
-namespace courgette {
+namespace {
+
+using courgette::CalculateCrc;
+using courgette::SinkStream;
+using courgette::SinkStreamSet;
+using courgette::SourceStream;
+using courgette::SourceStreamSet;
+
+}  // namespace
+
+namespace bsdiff {
 
 BSDiffStatus MBS_ReadHeader(SourceStream* stream, MBSPatchHeader* header) {
   if (!stream->Read(header->tag, sizeof(header->tag)))
     return READ_ERROR;
   if (!stream->ReadVarint32(&header->slen))
     return READ_ERROR;
   if (!stream->ReadVarint32(&header->scrc32))
     return READ_ERROR;
   if (!stream->ReadVarint32(&header->dlen))
     return READ_ERROR;
@@ skipping 150 matching lines @@
 
   // Write the stream to disk.
   int written = base::WriteFile(
       new_file_path, reinterpret_cast<const char*>(new_sink_stream.Buffer()),
       static_cast<int>(new_sink_stream.Length()));
   if (written != static_cast<int>(new_sink_stream.Length()))
     return WRITE_ERROR;
   return OK;
 }
 
-}  // namespace
+}  // namespace bsdiff