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/* mdXhl.c
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/lib/libmd/mdXhl.c 294037 2016-01-14 21:08:23Z jtl $");
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "commoncrypto.h"
#define LENGTH CC_MD5_DIGEST_LENGTH
char *MD5FileChunk(const char *, char *, off_t, off_t);
char *
MD5End(CC_MD5_CTX *ctx, char *buf)
{
int i;
unsigned char digest[LENGTH];
static const char hex[]="0123456789abcdef";
if (!buf)
buf = malloc(2*LENGTH + 1);
if (!buf)
return 0;
CC_MD5_Final(digest, ctx);
for (i = 0; i < LENGTH; i++) {
buf[i+i] = hex[digest[i] >> 4];
buf[i+i+1] = hex[digest[i] & 0x0f];
}
buf[i+i] = '\0';
return buf;
}
char *
MD5File(const char *filename, char *buf)
{
return (MD5FileChunk(filename, buf, 0, 0));
}
char *
MD5FileChunk(const char *filename, char *buf, off_t ofs, off_t len)
{
unsigned char buffer[16*1024];
CC_MD5_CTX ctx;
int fd, readrv, e;
off_t remain;
if (len < 0) {
errno = EINVAL;
return NULL;
}
CC_MD5_Init(&ctx);
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;
if (ofs != 0) {
errno = 0;
if (lseek(fd, ofs, SEEK_SET) != ofs ||
(ofs == -1 && errno != 0)) {
readrv = -1;
goto error;
}
}
remain = len;
readrv = 0;
while (len == 0 || remain > 0) {
if (len == 0 || remain > (off_t)sizeof(buffer))
readrv = read(fd, buffer, sizeof(buffer));
else
readrv = read(fd, buffer, remain);
if (readrv <= 0)
break;
CC_MD5_Update(&ctx, buffer, readrv);
remain -= readrv;
}
error:
e = errno;
close(fd);
errno = e;
if (readrv < 0)
return NULL;
return (MD5End(&ctx, buf));
}
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