mbr: convert to preprocessed source
[dragonfly.git] / lib / libmd / mdXhl.c
blob96b71caeb3a8afb1813ee81b4561958116035709
1 /* mdXhl.c * ----------------------------------------------------------------------------
2 * "THE BEER-WARE LICENSE" (Revision 42):
3 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
4 * can do whatever you want with this stuff. If we meet some day, and you think
5 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
6 * ----------------------------------------------------------------------------
8 * $FreeBSD: src/lib/libmd/mdXhl.c,v 1.19 2006/01/17 15:35:56 phk Exp $
9 * $DragonFly: src/lib/libmd/mdXhl.c,v 1.3 2008/09/11 20:25:34 swildner Exp $
13 #include <sys/types.h>
14 #include <sys/stat.h>
15 #include <fcntl.h>
16 #include <unistd.h>
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
22 #include "mdX.h"
24 char *
25 MDXEnd(MDX_CTX *ctx, char *buf)
27 int i;
28 unsigned char digest[LENGTH];
29 static const char hex[]="0123456789abcdef";
31 if (!buf)
32 buf = malloc(2*LENGTH + 1);
33 if (!buf)
34 return 0;
35 MDXFinal(digest, ctx);
36 for (i = 0; i < LENGTH; i++) {
37 buf[i+i] = hex[digest[i] >> 4];
38 buf[i+i+1] = hex[digest[i] & 0x0f];
40 buf[i+i] = '\0';
41 return buf;
44 char *
45 MDXFile(const char *filename, char *buf)
47 return (MDXFileChunk(filename, buf, 0, 0));
50 char *
51 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
53 unsigned char buffer[BUFSIZ];
54 MDX_CTX ctx;
55 struct stat stbuf;
56 int f, i, e;
57 off_t n;
59 MDXInit(&ctx);
60 f = open(filename, O_RDONLY);
61 if (f < 0)
62 return 0;
63 if (fstat(f, &stbuf) < 0)
64 return 0;
65 if (ofs > stbuf.st_size)
66 ofs = stbuf.st_size;
67 if ((len == 0) || (len > stbuf.st_size - ofs))
68 len = stbuf.st_size - ofs;
69 if (lseek(f, ofs, SEEK_SET) < 0)
70 return 0;
71 n = len;
72 i = 0;
73 while (n > 0) {
74 if (n > sizeof(buffer))
75 i = read(f, buffer, sizeof(buffer));
76 else
77 i = read(f, buffer, n);
78 if (i < 0)
79 break;
80 MDXUpdate(&ctx, buffer, i);
81 n -= i;
83 e = errno;
84 close(f);
85 errno = e;
86 if (i < 0)
87 return 0;
88 return (MDXEnd(&ctx, buf));
91 char *
92 MDXData (const void *data, unsigned int len, char *buf)
94 MDX_CTX ctx;
96 MDXInit(&ctx);
97 MDXUpdate(&ctx,data,len);
98 return (MDXEnd(&ctx, buf));