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1 /*- | |
2 * Copyright 2003,2004 Colin Percival | |
3 * All rights reserved | |
4 * | |
5 * Redistribution and use in source and binary forms, with or without | |
6 * modification, are permitted providing that the following conditions | |
7 * are met: | |
8 * 1. Redistributions of source code must retain the above copyright | |
9 * notice, this list of conditions and the following disclaimer. | |
10 * 2. Redistributions in binary form must reproduce the above copyright | |
11 * notice, this list of conditions and the following disclaimer in the | |
12 * documentation and/or other materials provided with the distribution. | |
13 * | |
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY | |
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
24 * POSSIBILITY OF SUCH DAMAGE. | |
25 * | |
26 * Changelog: | |
27 * 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to | |
28 * the header, and make all the types 32-bit. | |
29 * --Benjamin Smedberg <benjamin@smedbergs.us> | |
30 * 2009-03-31 - Change to use Streams. Move CRC code to crc.{h,cc} | |
31 * Changed status to an enum, removed unused status codes. | |
32 * --Stephen Adams <sra@chromium.org> | |
33 */ | |
34 | |
35 #ifndef COURGETTE_BSDIFF_H_ | |
36 #define COURGETTE_BSDIFF_H_ | |
37 | |
38 #include "base/basictypes.h" | |
39 | |
40 namespace courgette { | |
41 | |
42 enum BSDiffStatus { | |
43 OK = 0, | |
44 MEM_ERROR = 1, | |
45 CRC_ERROR = 2, | |
46 READ_ERROR = 3, | |
47 UNEXPECTED_ERROR = 4 | |
48 }; | |
49 | |
50 class SourceStream; | |
51 class SinkStream; | |
52 | |
53 // Creates a binary patch. | |
54 // | |
55 BSDiffStatus CreateBinaryPatch(SourceStream* old_stream, | |
56 SourceStream* new_stream, | |
57 SinkStream* patch_stream); | |
58 | |
59 // Applies the given patch file to a given source file. This method validates | |
60 // the CRC of the original file stored in the patch file, before applying the | |
61 // patch to it. | |
62 // | |
63 BSDiffStatus ApplyBinaryPatch(SourceStream* old_stream, | |
64 SourceStream* patch_stream, | |
65 SinkStream* new_stream); | |
66 | |
67 | |
68 // The following declarations are common to the patch-creation and | |
69 // patch-application code. | |
70 | |
71 // The patch stream starts with a MBSPatchHeader. | |
72 typedef struct MBSPatchHeader_ { | |
73 char tag[8]; // Contains MBS_PATCH_HEADER_TAG | |
74 uint32 slen; // Length of the file to be patched. | |
75 uint32 scrc32; // CRC32 of the file to be patched. | |
76 uint32 dlen; // Length of the result file. | |
77 uint32 cblen; // Length of the control block in bytes. | |
78 uint32 difflen; // Length of the diff block in bytes. | |
79 uint32 extralen; // Length of the extra block in bytes. | |
80 } MBSPatchHeader; | |
81 | |
82 // This is the value for the tag field. Must match length exactly, not counting | |
83 // null at end of string. | |
84 #define MBS_PATCH_HEADER_TAG "GBSDIF42" | |
85 | |
86 } // namespace | |
87 #endif // COURGETTE_BSDIFF_H_ | |
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