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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