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/* $NetBSD: hashhl.c,v 1.7 2014/09/24 13:18:52 christos Exp $ */
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dkuug.dk> 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
* ----------------------------------------------------------------------------
*/
/*
* Modified September 24, 2005 by Elad Efrat <elad@NetBSD.org>
* Modified April 29, 1997 by Jason R. Thorpe <thorpej@NetBSD.org>
*/
#ifdef HASH_ALGORITHM
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
/*
* Do all the name mangling before we include "namespace.h"
*/
#define CONCAT(x,y) __CONCAT(x,y)
#ifndef HASH_FNPREFIX
#define HASH_FNPREFIX HASH_ALGORITHM
#endif /* !HASH_FNPREFIX */
#define FNPREFIX(x) CONCAT(HASH_FNPREFIX,x)
#define HASH_CTX CONCAT(HASH_ALGORITHM,_CTX)
#define HASH_LEN CONCAT(HASH_ALGORITHM,_DIGEST_LENGTH)
#define HASH_STRLEN CONCAT(HASH_ALGORITHM,_DIGEST_STRING_LENGTH)
#if !defined(_KERNEL) && defined(__weak_alias) && !defined(HAVE_NBTOOL_CONFIG_H)
#define WA(a,b) __weak_alias(a,b)
WA(FNPREFIX(End),CONCAT(_,FNPREFIX(End)))
WA(FNPREFIX(FileChunk),CONCAT(_,FNPREFIX(FileChunk)))
WA(FNPREFIX(File),CONCAT(_,FNPREFIX(File)))
WA(FNPREFIX(Data),CONCAT(_,FNPREFIX(Data)))
#undef WA
#endif
#include "namespace.h"
#include HASH_INCLUDE
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef MIN
#define MIN(x,y) ((x)<(y)?(x):(y))
#endif /* !MIN */
char *
FNPREFIX(End)(HASH_CTX *ctx, char *buf)
{
int i;
unsigned char digest[HASH_LEN];
static const char hex[]="0123456789abcdef";
_DIAGASSERT(ctx != 0);
if (buf == NULL)
buf = malloc((size_t)HASH_STRLEN);
if (buf == NULL)
return (NULL);
FNPREFIX(Final)(digest, ctx);
for (i = 0; i < HASH_LEN; i++) {
buf[i+i] = hex[(u_int32_t)digest[i] >> 4];
buf[i+i+1] = hex[digest[i] & 0x0f];
}
buf[i+i] = '\0';
return (buf);
}
char *
FNPREFIX(FileChunk)(const char *filename, char *buf, off_t off, off_t len)
{
struct stat sb;
u_char buffer[BUFSIZ];
HASH_CTX ctx;
int fd, save_errno;
ssize_t nr;
FNPREFIX(Init)(&ctx);
if ((fd = open(filename, O_RDONLY | O_CLOEXEC)) < 0)
return (NULL);
if (len == 0) {
if (fstat(fd, &sb) == -1) {
close(fd);
return (NULL);
}
len = sb.st_size;
}
if (off > 0 && lseek(fd, off, SEEK_SET) < 0) {
close(fd);
return (NULL);
}
while ((nr = read(fd, buffer, (size_t) MIN((off_t)sizeof(buffer), len)))
> 0) {
FNPREFIX(Update)(&ctx, buffer, (unsigned int)nr);
if (len > 0 && (len -= nr) == 0)
break;
}
save_errno = errno;
close(fd);
errno = save_errno;
return (nr < 0 ? NULL : FNPREFIX(End)(&ctx, buf));
}
char *
FNPREFIX(File)(const char *filename, char *buf)
{
return (FNPREFIX(FileChunk)(filename, buf, (off_t)0, (off_t)0));
}
char *
FNPREFIX(Data)(const unsigned char *data, size_t len, char *buf)
{
HASH_CTX ctx;
_DIAGASSERT(data != 0);
FNPREFIX(Init)(&ctx);
FNPREFIX(Update)(&ctx, data, (unsigned int)len);
return (FNPREFIX(End)(&ctx, buf));
}
#endif /* HASH_ALGORITHM */
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