/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
- * Copyright (C) 2002-2010 Aleph One Ltd.
+ * Copyright (C) 2002-2011 Aleph One Ltd.
* for Toby Churchill Ltd and Brightstar Engineering
*
* Created by Charles Manning <charles@aleph1.co.uk>
*/
/*
- * This simple implementation of a name-value store assumes a small number of values and fits
- * into a small finite buffer.
+ * 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.
+ * sizeof(size) bytes record size.
* strnlen+1 bytes name null terminated.
* nbytes value.
* ----------
- * total size stored in record size
+ * total size stored in record size
+ *
+ * This code has not been tested with unicode yet.
*/
-
#include "yaffs_nameval.h"
-
+#include "yaffs_guts.h"
#include "yportenv.h"
-
-static int nval_find(const char *xb, int xb_size, const char *name)
+#include "yaffs_endian.h"
+
+static int nval_find(struct yaffs_dev *dev,
+ const char *xb, int xb_size, const YCHAR *name,
+ int *exist_size)
{
- int pos=0;
- int size;
+ int pos = 0;
+ s32 size;
- memcpy(&size,xb,sizeof(int));
- while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
- if(strncmp(xb+pos+sizeof(int),name,size) == 0)
+ memcpy(&size, xb, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+
+ while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+ if (!strncmp((YCHAR *) (xb + pos + sizeof(size)),
+ name, size)) {
+ if (exist_size)
+ *exist_size = size;
return pos;
+ }
pos += size;
- if(pos < xb_size -sizeof(int))
- memcpy(&size,xb + pos,sizeof(int));
- else
+ if (pos < (int)(xb_size - sizeof(size))) {
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+
+ } else
size = 0;
}
- return -1;
+ if (exist_size)
+ *exist_size = 0;
+ return -ENODATA;
}
-static int nval_used(const char *xb, int xb_size)
+static int nval_used(struct yaffs_dev *dev, const char *xb, int xb_size)
{
- int pos=0;
- int size;
+ int pos = 0;
+ s32 size;
+
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
- memcpy(&size,xb + pos,sizeof(int));
- while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+ 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
+ if (pos < (int)(xb_size - sizeof(size))) {
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+ } else
size = 0;
}
return pos;
}
-int nval_del(char *xb, int xb_size, const char *name)
+int nval_del(struct yaffs_dev *dev, char *xb, int xb_size, const YCHAR *name)
{
- int pos = nval_find(xb, xb_size, name);
- 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 -ENOENT;
+ int pos = nval_find(dev, xb, xb_size, name, NULL);
+ s32 size;
+
+ if (pos < 0 || pos >= xb_size)
+ return -ENODATA;
+
+ /* Find size, shift rest over this record,
+ * then zero out the rest of buffer */
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+
+ memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+ memset(xb + (xb_size - size), 0, size);
+ return 0;
}
-int nval_set(char *xb, int xb_size, const char *name, const char *buf, int bsize, int flags)
+int nval_set(struct yaffs_dev *dev,
+ char *xb, int xb_size, const YCHAR *name, const char *buf,
+ int bsize, int flags)
{
- int pos = nval_find(xb,xb_size,name);
- int namelen = strnlen(name,xb_size);
- int reclen;
+ int pos;
+ int namelen = strnlen(name, xb_size);
+ int size_exist = 0;
+ int space;
+ int start;
+ s32 reclen;
+ s32 reclen_endianised;
- if(flags & NVAL_CREATE && pos >= 0)
+ pos = nval_find(dev, xb, xb_size, name, &size_exist);
+
+ if (flags & XATTR_CREATE && pos >= 0)
return -EEXIST;
- if(flags & NVAL_REPLACE && pos < 0)
- return -ENOENT;
-
- nval_del(xb,xb_size,name);
-
- pos = nval_used(xb, xb_size);
-
- if(pos < xb_size && bsize < xb_size && namelen < xb_size){
- reclen = (sizeof(int) + namelen + 1 + bsize);
- if( pos + reclen < xb_size){
- memcpy(xb + pos,&reclen,sizeof(int));
- pos +=sizeof(int);
- strncpy(xb + pos, name, reclen);
- pos+= (namelen+1);
- memcpy(xb + pos,buf,bsize);
- pos+= bsize;
- return 0;
- }
+ if (flags & XATTR_REPLACE && pos < 0)
+ return -ENODATA;
+
+ start = nval_used(dev, xb, xb_size);
+ space = xb_size - start + size_exist;
+
+ reclen = (sizeof(reclen) + namelen + 1 + bsize);
+
+ if (reclen > space)
+ return -ENOSPC;
+
+ if (pos >= 0) {
+ /* Exists, so delete it. */
+ nval_del(dev, xb, xb_size, name);
+ start = nval_used(dev, xb, xb_size);
}
- return -ENOSPC;
+
+ pos = start;
+
+ reclen_endianised = reclen;
+ yaffs_do_endian_s32(dev, &reclen_endianised);
+ memcpy(xb + pos, &reclen_endianised, sizeof(reclen_endianised));
+ pos += sizeof(reclen_endianised);
+ 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 char *name, char *buf, int bsize)
+int nval_get(struct yaffs_dev *dev,
+ const char *xb, int xb_size, const YCHAR * name, char *buf,
+ int bsize)
{
- int pos = nval_find(xb,xb_size,name);
- int size;
-
- if(pos >= 0 && pos< xb_size){
-
- memcpy(&size,xb +pos,sizeof(int));
- pos+=sizeof(int); /* advance past record length */
- size -= sizeof(int);
+ int pos = nval_find(dev, xb, xb_size, name, NULL);
+ s32 size;
+
+ if (pos >= 0 && pos < xb_size) {
+
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+ pos += sizeof(size); /* advance past record length */
+ size -= sizeof(size);
/* Advance over name string */
- while(xb[pos] && size > 0 && pos < xb_size){
+ while (xb[pos] && size > 0 && pos < xb_size) {
pos++;
size--;
}
pos++;
size--;
- if(size <= bsize){
- memcpy(buf,xb + pos,size);
+ /* If bsize is zero then this is a size query.
+ * Return the size, but don't copy.
+ */
+ if (!bsize)
+ return size;
+
+ if (size <= bsize) {
+ memcpy(buf, xb + pos, size);
return size;
}
-
}
- return -ENOENT;
+ if (pos >= 0)
+ return -ERANGE;
+
+ return -ENODATA;
}
-int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+int nval_list(struct yaffs_dev *dev, const char *xb, int xb_size, char *buf, int bsize)
{
int pos = 0;
- int size;
+ s32 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 = strnlen(xb + pos, size);
- if(ncopied + name_len + 1 < bsize){
- memcpy(buf,xb+pos,name_len);
- buf+= name_len;
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+
+ while (size > (int)(sizeof(size)) &&
+ size <= xb_size &&
+ (pos + size) < xb_size &&
+ !filled) {
+ pos += sizeof(size);
+ size -= sizeof(size);
+ name_len = 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++;
- ncopied += (name_len+1);
- } else
+ 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));
+ }
+ pos += size;
+ if (pos < (int)(xb_size - sizeof(size))) {
+ memcpy(&size, xb + pos, sizeof(size));
+ yaffs_do_endian_s32(dev, &size);
+ }
else
size = 0;
}
return ncopied;
}
-int nval_load(char *xb, int xb_size, const char *src, int src_size)
-{
- int tx_size;
- int used;
-
- tx_size = xb_size;
- if(tx_size > src_size)
- tx_size = src_size;
-
- memcpy(xb,src,tx_size);
- used = nval_used(xb, xb_size);
-
- if( used < xb_size)
- memset(xb+ used, 0, xb_size - used);
- return used;
-}
-
-int nval_save(const char *xb, int xb_size, char *dest, int dest_size)
+int nval_hasvalues(struct yaffs_dev *dev, const char *xb, int xb_size)
{
- int tx_size;
-
- tx_size = xb_size;
- if(tx_size > dest_size)
- tx_size = dest_size;
-
- memcpy(dest,xb,tx_size);
- return tx_size;
+ return nval_used(dev, xb, xb_size) > 0;
}
projects / yaffs2.git / blobdiff