www.pudn.com > cryptfs030905.rar > subr.c

/*
 * Copyright (c) 1997-2003 Erez Zadok
 * Copyright (c) 2001-2003 Stony Brook University
 *
 * For specific licensing information, see the COPYING file distributed with
 * this package, or get one from ftp://ftp.filesystems.org/pub/fist/COPYING.
 *
 * This Copyright notice must be kept intact and distributed with all
 * fistgen sources INCLUDING sources generated by fistgen.
 */
/*
 *  $Id: subr.c,v 1.8 2003/05/24 00:06:18 ezk Exp $
 */

#ifdef HAVE_CONFIG_H
# include 
#endif /* HAVE_CONFIG_H */
#ifdef FISTGEN
# include "fist_cryptfs.h"
#endif /* FISTGEN */
#include "fist.h"
#include "cryptfs.h"

#error do not compile this file directly. it is only an example.

/*
 * return the number of bytes written
 */
int
cryptfs_encode_block(const char *from, char *to, int len, const vnode_t *this_vnode, const vfs_t *this_vfsp, u_long pagenum)
{
    memcpy(to, from, len);
    return len;
}


int
cryptfs_decode_block(const char *from, char *to, int len, const vnode_t *this_vnode, const vfs_t *this_vfsp, u_long pagenum)
{
    memcpy(to, from, len);
    return len;
}

int
cryptfs_encode_filename(const char *name, int length, char **encoded_name, int skip_dots, const vnode_t *this_vnode, const vfs_t *this_vfsp)
{
    int encoded_length;

    encoded_length = length + 1;
    *encoded_name = kmalloc(encoded_length, GFP_KERNEL);
    if (!*encoded_name) {
	printk("<0>Kernel out of memory!\n");
	ASSERT(NULL);
    }
    memcpy(*encoded_name, name, length);
    (*encoded_name)[length] = '\0';

    return encoded_length;
}

/* returns length of decoded string, or -1 if error */
int
cryptfs_decode_filename(const char *name, int length, char **decoded_name, int skip_dots, const vnode_t *this_vnode, const vfs_t *this_vfsp)
{
    int error = 0;

    *decoded_name = kmalloc(length, GFP_KERNEL);
    if (!*decoded_name) {
	printk("<0>Kernel out of memory!\n");
	ASSERT(NULL);
    }
    memcpy(*decoded_name, name, length);
    error = length;

    return error;
}


/*
 * Local variables:
 * c-basic-offset: 4
 * End:
 */