1 /* mdXhl.c
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 * libjpeg-turbo Modifications:
9 * Copyright (C)2016, 2018-2019 D. R. Commander. All Rights Reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are met:
13 *
14 * - Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * - Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * - Neither the name of the libjpeg-turbo Project nor the names of its
20 * contributors may be used to endorse or promote products derived from this
21 * software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
24 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
27 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
33 * POSSIBILITY OF SUCH DAMAGE.
34 * ----------------------------------------------------------------------------
35 */
36
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 #ifdef _WIN32
41 #include <io.h>
42 #define close _close
43 #define fstat _fstat
44 #define lseek _lseek
45 #define read _read
46 #define stat _stat
47 #else
48 #include <unistd.h>
49 #endif
50
51 #include <errno.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54
55 #define LENGTH 16
56
57 #include "./md5.h"
58
MD5End(MD5_CTX * ctx,char * buf)59 static char *MD5End(MD5_CTX *ctx, char *buf)
60 {
61 int i;
62 unsigned char digest[LENGTH];
63 static const char hex[] = "0123456789abcdef";
64
65 if (!buf)
66 buf = malloc(2 * LENGTH + 1);
67 if (!buf)
68 return 0;
69 MD5Final(digest, ctx);
70 for (i = 0; i < LENGTH; i++) {
71 buf[i + i] = hex[digest[i] >> 4];
72 buf[i + i + 1] = hex[digest[i] & 0x0f];
73 }
74 buf[i + i] = '\0';
75 return buf;
76 }
77
MD5File(const char * filename,char * buf)78 char *MD5File(const char *filename, char *buf)
79 {
80 return (MD5FileChunk(filename, buf, 0, 0));
81 }
82
MD5FileChunk(const char * filename,char * buf,off_t ofs,off_t len)83 char *MD5FileChunk(const char *filename, char *buf, off_t ofs, off_t len)
84 {
85 unsigned char buffer[BUFSIZ];
86 MD5_CTX ctx;
87 struct stat stbuf;
88 int f, i, e;
89 off_t n;
90
91 MD5Init(&ctx);
92 #ifdef _WIN32
93 f = _open(filename, O_RDONLY | O_BINARY);
94 #else
95 f = open(filename, O_RDONLY);
96 #endif
97 if (f < 0)
98 return 0;
99 if (fstat(f, &stbuf) < 0)
100 return 0;
101 if (ofs > stbuf.st_size)
102 ofs = stbuf.st_size;
103 if ((len == 0) || (len > stbuf.st_size - ofs))
104 len = stbuf.st_size - ofs;
105 if (lseek(f, ofs, SEEK_SET) < 0)
106 return 0;
107 n = len;
108 i = 0;
109 while (n > 0) {
110 if (n > sizeof(buffer))
111 i = read(f, buffer, sizeof(buffer));
112 else
113 i = read(f, buffer, n);
114 if (i < 0)
115 break;
116 MD5Update(&ctx, buffer, i);
117 n -= i;
118 }
119 e = errno;
120 close(f);
121 errno = e;
122 if (i < 0)
123 return 0;
124 return (MD5End(&ctx, buf));
125 }
126