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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2010 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
* This simple implementation of a name-value store assumes a small number of values and fits
* into a small finite buffer.
*
* Each attribute is stored as a record:
* sizeof(int) bytes record size.
* strnlen+1 bytes name null terminated.
* nbytes value.
* ----------
* total size stored in record size
*
* This code has not been tested with unicode yet.
*/
#include "yaffs_nameval.h"
#include "yportenv.h"
static int nval_find(const char *xb, int xb_size, const YCHAR *name,
int *exist_size)
{
int pos=0;
int size;
memcpy(&size,xb,sizeof(int));
while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
if(yaffs_strncmp((YCHAR *)(xb+pos+sizeof(int)),name,size) == 0){
if(exist_size)
*exist_size = size;
return pos;
}
pos += size;
if(pos < xb_size -sizeof(int))
memcpy(&size,xb + pos,sizeof(int));
else
size = 0;
}
if(exist_size)
*exist_size = 0;
return -1;
}
static int nval_used(const char *xb, int xb_size)
{
int pos=0;
int size;
memcpy(&size,xb + pos,sizeof(int));
while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
pos += size;
if(pos < xb_size -sizeof(int))
memcpy(&size,xb + pos,sizeof(int));
else
size = 0;
}
return pos;
}
int nval_del(char *xb, int xb_size, const YCHAR *name)
{
int pos = nval_find(xb, xb_size, name, NULL);
int size;
if(pos >= 0 && pos < xb_size){
/* Find size, shift rest over this record, then zero out the rest of buffer */
memcpy(&size,xb+pos,sizeof(int));
memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
memset(xb + (xb_size - size),0,size);
return 0;
} else
return -ENODATA;
}
int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags)
{
int pos;
int namelen = yaffs_strnlen(name,xb_size);
int reclen;
int size_exist = 0;
int space;
int start;
pos = nval_find(xb,xb_size,name, &size_exist);
if(flags & XATTR_CREATE && pos >= 0)
return -EEXIST;
if(flags & XATTR_REPLACE && pos < 0)
return -ENODATA;
start = nval_used(xb,xb_size);
space = xb_size - start + size_exist;
reclen = (sizeof(int) + namelen + 1 + bsize);
if(reclen > space)
return -ENOSPC;
if(pos >= 0){
nval_del(xb,xb_size,name);
start = nval_used(xb, xb_size);
}
pos = start;
memcpy(xb + pos,&reclen,sizeof(int));
pos +=sizeof(int);
yaffs_strncpy((YCHAR *)(xb + pos), name, reclen);
pos+= (namelen+1);
memcpy(xb + pos,buf,bsize);
return 0;
}
int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize)
{
int pos = nval_find(xb,xb_size,name,NULL);
int size;
if(pos >= 0 && pos< xb_size){
memcpy(&size,xb +pos,sizeof(int));
pos+=sizeof(int); /* advance past record length */
size -= sizeof(int);
/* Advance over name string */
while(xb[pos] && size > 0 && pos < xb_size){
pos++;
size--;
}
/*Advance over NUL */
pos++;
size--;
if(size <= bsize){
memcpy(buf,xb + pos,size);
return size;
}
}
if(pos >= 0)
return -ERANGE;
else
return -ENODATA;
}
int nval_list(const char *xb, int xb_size, char *buf, int bsize)
{
int pos = 0;
int size;
int name_len;
int ncopied = 0;
int filled = 0;
memcpy(&size,xb + pos,sizeof(int));
while(size > sizeof(int) && size <= xb_size && (pos + size) < xb_size && !filled){
pos+= sizeof(int);
size-=sizeof(int);
name_len = yaffs_strnlen((YCHAR *)(xb + pos), size);
if(ncopied + name_len + 1 < bsize){
memcpy(buf,xb+pos,name_len * sizeof(YCHAR));
buf+= name_len;
*buf = '\0';
buf++;
if(sizeof(YCHAR) > 1){
*buf = '\0';
buf++;
}
ncopied += (name_len+1);
} else
filled = 1;
pos+=size;
if(pos < xb_size -sizeof(int))
memcpy(&size,xb + pos,sizeof(int));
else
size = 0;
}
return ncopied;
}
int nval_hasvalues(const char *xb, int xb_size)
{
return nval_used(xb, xb_size) > 0;
}
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