Mercurial > embed
annotate libzip/lib/zip_filerange_crc.c @ 63:b3c185090dc2
cmake: use BUILD_INTERFACE, closes #881 @10m
author | David Demelier <markand@malikania.fr> |
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date | Fri, 13 Jul 2018 12:32:37 +0200 |
parents | 056ee6b5913e |
children |
rev | line source |
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4 | 1 /* |
2 zip_filerange_crc.c -- compute CRC32 for a range of a file | |
56
056ee6b5913e
libzip: update to 1.3.0, closes #654
David Demelier <markand@malikania.fr>
parents:
4
diff
changeset
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3 Copyright (C) 2008-2016 Dieter Baron and Thomas Klausner |
4 | 4 |
5 This file is part of libzip, a library to manipulate ZIP archives. | |
6 The authors can be contacted at <libzip@nih.at> | |
7 | |
8 Redistribution and use in source and binary forms, with or without | |
9 modification, are permitted provided that the following conditions | |
10 are met: | |
11 1. Redistributions of source code must retain the above copyright | |
12 notice, this list of conditions and the following disclaimer. | |
13 2. Redistributions in binary form must reproduce the above copyright | |
14 notice, this list of conditions and the following disclaimer in | |
15 the documentation and/or other materials provided with the | |
16 distribution. | |
17 3. The names of the authors may not be used to endorse or promote | |
18 products derived from this software without specific prior | |
19 written permission. | |
20 | |
21 THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS | |
22 OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY | |
25 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE | |
27 GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
28 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER | |
29 IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
30 OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN | |
31 IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
32 */ | |
33 | |
34 | |
35 #include <stdio.h> | |
36 | |
37 #include "zipint.h" | |
38 | |
39 | |
40 | |
41 int | |
42 _zip_filerange_crc(zip_source_t *src, zip_uint64_t start, zip_uint64_t len, uLong *crcp, zip_error_t *error) | |
43 { | |
44 Bytef buf[BUFSIZE]; | |
45 zip_int64_t n; | |
46 | |
47 *crcp = crc32(0L, Z_NULL, 0); | |
48 | |
49 if (start > ZIP_INT64_MAX) { | |
50 zip_error_set(error, ZIP_ER_SEEK, EFBIG); | |
51 return -1; | |
52 } | |
53 | |
54 if (zip_source_seek(src, (zip_int64_t)start, SEEK_SET) != 0) { | |
55 _zip_error_set_from_source(error, src); | |
56 return -1; | |
57 } | |
58 | |
59 while (len > 0) { | |
60 n = (zip_int64_t)(len > BUFSIZE ? BUFSIZE : len); | |
61 if ((n = zip_source_read(src, buf, (zip_uint64_t)n)) < 0) { | |
62 _zip_error_set_from_source(error, src); | |
63 return -1; | |
64 } | |
65 if (n == 0) { | |
66 zip_error_set(error, ZIP_ER_EOF, 0); | |
67 return -1; | |
68 } | |
69 | |
70 *crcp = crc32(*crcp, buf, (uInt)n); | |
71 | |
72 len -= (zip_uint64_t)n; | |
73 } | |
74 | |
75 return 0; | |
76 } |