| /*- |
| * 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> |
| */ |
| |
| #ifndef COURGETTE_BSDIFF_H_ |
| #define COURGETTE_BSDIFF_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/files/file_util.h" |
| |
| namespace courgette { |
| |
| 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); |
| |
| // 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); |
| |
| // 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 slen; // Length of the file to be patched. |
| uint32 scrc32; // CRC32 of the file to be patched. |
| uint32 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 |
| #endif // COURGETTE_BSDIFF_H_ |
