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
   9 #include <sys/cdefs.h>
  10 __FBSDID("$FreeBSD$");
  11
  12 #include <sys/types.h>
  13 #include <sys/stat.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16
  17 #include <errno.h>
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20
  21 #include "mdX.h"
  22
  23 char *
  24 MDXEnd(MDX_CTX *ctx, char *buf)
  25 {
  26         int i;
  27         unsigned char digest[LENGTH];
  28         static const char hex[]="0123456789abcdef";
  29
  30         if (!buf)
  31                 buf = malloc(2*LENGTH + 1);
  32         if (!buf)
  33                 return 0;
  34         MDXFinal(digest, ctx);
  35         for (i = 0; i < LENGTH; i++) {
  36                 buf[i+i] = hex[digest[i] >> 4];
  37                 buf[i+i+1] = hex[digest[i] & 0x0f];
  38         }
  39         buf[i+i] = '\0';
  40         return buf;
  41 }
  42
  43 char *
  44 MDXFile(const char *filename, char *buf)
  45 {
  46         return (MDXFileChunk(filename, buf, 0, 0));
  47 }
  48
  49 char *
  50 MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
  51 {
  52         unsigned char buffer[BUFSIZ];
  53         MDX_CTX ctx;
  54         struct stat stbuf;
  55         int f, i, e;
  56         off_t n;
  57
  58         MDXInit(&ctx);
  59         f = open(filename, O_RDONLY);
  60         if (f < 0)
  61                 return 0;
  62         if (fstat(f, &stbuf) < 0)
  63                 return 0;
  64         if (ofs > stbuf.st_size)
  65                 ofs = stbuf.st_size;
  66         if ((len == 0) || (len > stbuf.st_size - ofs))
  67                 len = stbuf.st_size - ofs;
  68         if (lseek(f, ofs, SEEK_SET) < 0)
  69                 return 0;
  70         n = len;
  71         i = 0;
  72         while (n > 0) {
  73                 if (n > sizeof(buffer))
  74                         i = read(f, buffer, sizeof(buffer));
  75                 else
  76                         i = read(f, buffer, n);
  77                 if (i < 0)
  78                         break;
  79                 MDXUpdate(&ctx, buffer, i);
  80                 n -= i;
  81         }
  82         e = errno;
  83         close(f);
  84         errno = e;
  85         if (i < 0)
  86                 return 0;
  87         return (MDXEnd(&ctx, buf));
  88 }
  89
  90 char *
  91 MDXData (const void *data, unsigned int len, char *buf)
  92 {
  93         MDX_CTX ctx;
  94
  95         MDXInit(&ctx);
  96         MDXUpdate(&ctx,data,len);
  97         return (MDXEnd(&ctx, buf));
  98 }