175 lines
3.0 KiB
C
175 lines
3.0 KiB
C
/*
|
|
* (C) Copyright 2008-2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; version 2 of
|
|
* the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <digest.h>
|
|
#include <malloc.h>
|
|
#include <fs.h>
|
|
#include <fcntl.h>
|
|
#include <linux/stat.h>
|
|
#include <errno.h>
|
|
#include <module.h>
|
|
#include <linux/err.h>
|
|
|
|
static LIST_HEAD(digests);
|
|
|
|
static int dummy_init(struct digest *d)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
int digest_register(struct digest *d)
|
|
{
|
|
if (!d || !d->name || !d->update || !d->final || d->length < 1)
|
|
return -EINVAL;
|
|
|
|
if (!d->init)
|
|
d->init = dummy_init;
|
|
|
|
if (digest_get_by_name(d->name))
|
|
return -EEXIST;
|
|
|
|
list_add_tail(&d->list, &digests);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(digest_register);
|
|
|
|
void digest_unregister(struct digest *d)
|
|
{
|
|
if (!d)
|
|
return;
|
|
|
|
list_del(&d->list);
|
|
}
|
|
EXPORT_SYMBOL(digest_unregister);
|
|
|
|
struct digest* digest_get_by_name(char* name)
|
|
{
|
|
struct digest* d;
|
|
|
|
if (!name)
|
|
return NULL;
|
|
|
|
list_for_each_entry(d, &digests, list) {
|
|
if(strcmp(d->name, name) == 0)
|
|
return d;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(digest_get_by_name);
|
|
|
|
int digest_file_window(struct digest *d, char *filename,
|
|
unsigned char *hash,
|
|
ulong start, ulong size)
|
|
{
|
|
ulong len = 0;
|
|
int fd, now, ret = 0;
|
|
unsigned char *buf;
|
|
int flags = 0;
|
|
|
|
d->init(d);
|
|
|
|
fd = open(filename, O_RDONLY);
|
|
if (fd < 0) {
|
|
perror(filename);
|
|
return fd;
|
|
}
|
|
|
|
buf = memmap(fd, PROT_READ);
|
|
if (buf == (void *)-1) {
|
|
buf = xmalloc(4096);
|
|
flags = 1;
|
|
}
|
|
|
|
if (start > 0) {
|
|
if (flags) {
|
|
ret = lseek(fd, start, SEEK_SET);
|
|
if (ret == -1) {
|
|
perror("lseek");
|
|
goto out;
|
|
}
|
|
} else {
|
|
buf += start;
|
|
}
|
|
}
|
|
|
|
while (size) {
|
|
now = min((ulong)4096, size);
|
|
if (flags) {
|
|
now = read(fd, buf, now);
|
|
if (now < 0) {
|
|
ret = now;
|
|
perror("read");
|
|
goto out_free;
|
|
}
|
|
if (!now)
|
|
break;
|
|
}
|
|
|
|
if (ctrlc()) {
|
|
ret = -EINTR;
|
|
goto out_free;
|
|
}
|
|
|
|
d->update(d, buf, now);
|
|
size -= now;
|
|
len += now;
|
|
}
|
|
|
|
d->final(d, hash);
|
|
|
|
out_free:
|
|
if (flags)
|
|
free(buf);
|
|
out:
|
|
close(fd);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(digest_file_window);
|
|
|
|
int digest_file(struct digest *d, char *filename,
|
|
unsigned char *hash)
|
|
{
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = stat(filename, &st);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return digest_file_window(d, filename, hash, 0, st.st_size);
|
|
}
|
|
EXPORT_SYMBOL_GPL(digest_file);
|
|
|
|
int digest_file_by_name(char *algo, char *filename,
|
|
unsigned char *hash)
|
|
{
|
|
struct digest *d;
|
|
|
|
d = digest_get_by_name(algo);
|
|
if (!d)
|
|
return -EIO;
|
|
|
|
return digest_file(d, filename, hash);
|
|
}
|
|
EXPORT_SYMBOL_GPL(digest_file_by_name);
|