/src/libzip/lib/zip_source_read.c
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1 | | /* |
2 | | zip_source_read.c -- read data from zip_source |
3 | | Copyright (C) 2009-2022 Dieter Baron and Thomas Klausner |
4 | | |
5 | | This file is part of libzip, a library to manipulate ZIP archives. |
6 | | The authors can be contacted at <info@libzip.org> |
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 "zipint.h" |
36 | | |
37 | | |
38 | | zip_int64_t |
39 | 0 | zip_source_read(zip_source_t *src, void *data, zip_uint64_t len) { |
40 | 0 | zip_uint64_t bytes_read; |
41 | 0 | zip_int64_t n; |
42 | |
|
43 | 0 | if (src->source_closed) { |
44 | 0 | return -1; |
45 | 0 | } |
46 | 0 | if (!ZIP_SOURCE_IS_OPEN_READING(src) || len > ZIP_INT64_MAX || (len > 0 && data == NULL)) { |
47 | 0 | zip_error_set(&src->error, ZIP_ER_INVAL, 0); |
48 | 0 | return -1; |
49 | 0 | } |
50 | | |
51 | 0 | if (src->had_read_error) { |
52 | 0 | return -1; |
53 | 0 | } |
54 | | |
55 | 0 | if (_zip_source_eof(src)) { |
56 | 0 | return 0; |
57 | 0 | } |
58 | | |
59 | 0 | if (len == 0) { |
60 | 0 | return 0; |
61 | 0 | } |
62 | | |
63 | 0 | bytes_read = 0; |
64 | 0 | while (bytes_read < len) { |
65 | 0 | if ((n = _zip_source_call(src, (zip_uint8_t *)data + bytes_read, len - bytes_read, ZIP_SOURCE_READ)) < 0) { |
66 | 0 | src->had_read_error = true; |
67 | 0 | if (bytes_read == 0) { |
68 | 0 | return -1; |
69 | 0 | } |
70 | 0 | else { |
71 | 0 | return (zip_int64_t)bytes_read; |
72 | 0 | } |
73 | 0 | } |
74 | | |
75 | 0 | if (n == 0) { |
76 | 0 | src->eof = 1; |
77 | 0 | break; |
78 | 0 | } |
79 | | |
80 | 0 | bytes_read += (zip_uint64_t)n; |
81 | 0 | } |
82 | | |
83 | 0 | if (src->bytes_read + bytes_read < src->bytes_read) { |
84 | 0 | src->bytes_read = ZIP_UINT64_MAX; |
85 | 0 | } |
86 | 0 | else { |
87 | 0 | src->bytes_read += bytes_read; |
88 | 0 | } |
89 | 0 | return (zip_int64_t)bytes_read; |
90 | 0 | } |
91 | | |
92 | | |
93 | | bool |
94 | 0 | _zip_source_eof(zip_source_t *src) { |
95 | 0 | return src->eof; |
96 | 0 | } |