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

courgette/third_party/bsdiff/bsdiff.h

-/*-
- * 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:
- * 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to
- *              the header, and make all the types 32-bit.
- *                --Benjamin Smedberg <benjamin@smedbergs.us>
- * 2009-03-31 - Change to use Streams.  Move CRC code to crc.{h,cc}
- *              Changed status to an enum, removed unused status codes.
- *                --Stephen Adams <sra@chromium.org>
- * 2013-04-10 - Added wrapper to apply a patch directly to files.
- *                --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".
+//
+// Changelog:
+// 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to
+//              the header, and make all the types 32-bit.
+//                --Benjamin Smedberg <benjamin@smedbergs.us>
+// 2009-03-31 - Change to use Streams.  Move CRC code to crc.{h,cc}
+//              Changed status to an enum, removed unused status codes.
+//                --Stephen Adams <sra@chromium.org>
+// 2013-04-10 - Added wrapper to apply a patch directly to files.
+//                --Joshua Pawlicki <waffles@chromium.org>
+
+// Copyright 2016 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.
 
 #ifndef COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_H_
 #define COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_H_
 
 #include <stdint.h>
 
 #include "base/files/file_util.h"
 
 namespace courgette {
+class SourceStream;
+class SinkStream;
+}  // namespace courgette
+
+namespace bsdiff {
 
 enum BSDiffStatus {
   OK = 0,
   MEM_ERROR = 1,
   CRC_ERROR = 2,
   READ_ERROR = 3,
   UNEXPECTED_ERROR = 4,
   WRITE_ERROR = 5
 };
 
-class SourceStream;
-class SinkStream;
-
 // Creates a binary patch.
 //
-BSDiffStatus CreateBinaryPatch(SourceStream* old_stream,
-                               SourceStream* new_stream,
-                               SinkStream* patch_stream);
+BSDiffStatus CreateBinaryPatch(courgette::SourceStream* old_stream,
+                               courgette::SourceStream* new_stream,
+                               courgette::SinkStream* patch_stream);
 
 // Applies the given patch file to a given source file. This method validates
 // the CRC of the original file stored in the patch file, before applying the
 // patch to it.
 //
-BSDiffStatus ApplyBinaryPatch(SourceStream* old_stream,
-                              SourceStream* patch_stream,
-                              SinkStream* new_stream);
+BSDiffStatus ApplyBinaryPatch(courgette::SourceStream* old_stream,
+                              courgette::SourceStream* patch_stream,
+                              courgette::SinkStream* new_stream);
 
 // As above, but simply takes the file paths.
 BSDiffStatus ApplyBinaryPatch(const base::FilePath& old_stream,
                               const base::FilePath& patch_stream,
                               const base::FilePath& new_stream);
 
 // The following declarations are common to the patch-creation and
 // patch-application code.
 
 // The patch stream starts with a MBSPatchHeader.
 typedef struct MBSPatchHeader_ {
   char tag[8];      // Contains MBS_PATCH_HEADER_TAG.
   uint32_t slen;    // Length of the file to be patched.
   uint32_t scrc32;  // CRC32 of the file to be patched.
   uint32_t dlen;    // Length of the result file.
 } MBSPatchHeader;
 
 // This is the value for the tag field.  Must match length exactly, not counting
 // null at end of string.
 #define MBS_PATCH_HEADER_TAG "GBSDIF42"
 
-}  // namespace
+}  // namespace bsdiff
+
 #endif  // COURGETTE_THIRD_PARTY_BSDIFF_BSDIFF_H_