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Diffstat (limited to 'third_party/courgette/bsdiff.h')
| -rw-r--r-- | third_party/courgette/bsdiff.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/courgette/bsdiff.h b/third_party/courgette/bsdiff.h new file mode 100644 index 0000000..bf7fdec --- /dev/null +++ b/third_party/courgette/bsdiff.h @@ -0,0 +1,87 @@ +/*- + * 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> + */ + +#ifndef COURGETTE_BSDIFF_H_ +#define COURGETTE_BSDIFF_H_ + +#include "base/basictypes.h" + +namespace courgette { + +enum BSDiffStatus { + OK = 0, + MEM_ERROR = 1, + CRC_ERROR = 2, + READ_ERROR = 3, + UNEXPECTED_ERROR = 4 +}; + +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); + + +// 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. + uint32 cblen; // Length of the control block in bytes. + uint32 difflen; // Length of the diff block in bytes. + uint32 extralen; // Length of the extra block in bytes. +} 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_ |