lib/libmd/mdXhl.c

   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  * ----------------------------------------------------------------------------
   7  *
   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 $
  10  *
  11  */
  12
  13 #include <sys/types.h>
  14 #include <sys/stat.h>
  15 #include <fcntl.h>
  16 #include <unistd.h>
  17
  18 #include <errno.h>
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21
  22 #include "mdX.h"
  23
  24 char *
  25 MDXEnd(MDX_CTX *ctx, char *buf)
  26 {
  27         int i;
  28         unsigned char digest[LENGTH];
  29         static const char hex[]="0123456789abcdef";
  30
  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];
  39         }
  40         buf[i+i] = '\0';
  41         return buf;
  42 }
  43
  44 char *
  45 MDXFile(const char *filename, char *buf)
  46 {
  47         return (MDXFileChunk(filename, buf, 0, 0));
  48 }
  49
  50 char *
  51 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
  52 {
  53         unsigned char buffer[8192];
  54         MDX_CTX ctx;
  55         struct stat stbuf;
  56         int f, i, e;
  57         off_t n;
  58
  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;
  82         }
  83         e = errno;
  84         close(f);
  85         errno = e;
  86         if (i < 0)
  87                 return 0;
  88         return (MDXEnd(&ctx, buf));
  89 }
  90
  91 char *
  92 MDXData (const void *data, unsigned int len, char *buf)
  93 {
  94         MDX_CTX ctx;
  95
  96         MDXInit(&ctx);
  97         MDXUpdate(&ctx,data,len);
  98         return (MDXEnd(&ctx, buf));
  99 }