05bd7afb3a
rename it to digest_file_window introduce digest_file to digest a file and digest_file_by_name where we specify the algo by name Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
179 lines
3.2 KiB
C
179 lines
3.2 KiB
C
/*
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* (C) Copyright 2008-2010 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <digest.h>
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#include <malloc.h>
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#include <fs.h>
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#include <fcntl.h>
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#include <linux/stat.h>
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#include <errno.h>
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#include <module.h>
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#include <linux/err.h>
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static LIST_HEAD(digests);
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static int dummy_init(struct digest *d)
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{
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return 0;
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}
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int digest_register(struct digest *d)
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{
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if (!d || !d->name || !d->update || !d->final || d->length < 1)
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return -EINVAL;
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if (!d->init)
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d->init = dummy_init;
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if (digest_get_by_name(d->name))
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return -EEXIST;
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list_add_tail(&d->list, &digests);
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return 0;
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}
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EXPORT_SYMBOL(digest_register);
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void digest_unregister(struct digest *d)
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{
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if (!d)
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return;
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list_del(&d->list);
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}
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EXPORT_SYMBOL(digest_unregister);
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struct digest* digest_get_by_name(char* name)
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{
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struct digest* d;
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if (!name)
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return NULL;
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list_for_each_entry(d, &digests, list) {
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if(strcmp(d->name, name) == 0)
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return d;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(digest_get_by_name);
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int digest_file_window(struct digest *d, char *filename,
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unsigned char *hash,
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ulong start, ulong size)
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{
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ulong len = 0;
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int fd, now, ret = 0;
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unsigned char *buf;
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int flags;
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d->init(d);
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fd = open(filename, O_RDONLY);
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if (fd < 0) {
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perror(filename);
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return fd;
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}
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buf = memmap(fd, PROT_READ);
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if (buf == (void *)-1) {
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buf = xmalloc(4096);
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flags = 1;
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}
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if (start > 0) {
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if (flags) {
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ret = lseek(fd, start, SEEK_SET);
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if (ret == -1) {
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perror("lseek");
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goto out;
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}
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} else {
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buf += start;
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}
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}
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while (size) {
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now = min((ulong)4096, size);
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if (flags) {
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now = read(fd, buf, now);
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if (now < 0) {
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ret = now;
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perror("read");
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goto out_free;
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}
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if (!now)
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break;
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}
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if (ctrlc()) {
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ret = -EINTR;
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goto out_free;
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}
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d->update(d, buf, now);
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size -= now;
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len += now;
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}
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d->final(d, hash);
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out_free:
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if (flags)
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free(buf);
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out:
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close(fd);
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return ret;
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}
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EXPORT_SYMBOL_GPL(digest_file_window);
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int digest_file(struct digest *d, char *filename,
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unsigned char *hash)
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{
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struct stat st;
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int ret;
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ret = stat(filename, &st);
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if (ret < 0)
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return ret;
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return digest_file_window(d, filename, hash, 0, st.st_size);
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}
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EXPORT_SYMBOL_GPL(digest_file);
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int digest_file_by_name(char *algo, char *filename,
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unsigned char *hash)
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{
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struct digest *d;
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d = digest_get_by_name(algo);
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if (!d)
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return -EIO;
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return digest_file(d, filename, hash);
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}
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EXPORT_SYMBOL_GPL(digest_file_by_name);
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