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Message-Id: <1288636877-7964-17-git-send-email-tdent48227@gmail.com>
Date: Mon, 1 Nov 2010 14:41:04 -0400
From: Tracey Dent <tdent48227@...il.com>
To: greg@...ah.com
Cc: manningc2@...rix.gen.nz, linux-kernel@...r.kernel.org,
linux-fsdevel@...r.kernel.org, Tracey Dent <tdent48227@...il.com>
Subject: [PATCH 16/29] Staging: yaffs2: yaffs_nameval: Add files
Adding files to yaffs2 directory.
Signed-off-by: Tracey Dent <tdent48227@...il.com>
---
drivers/staging/yaffs2/yaffs_nameval.c | 197 ++++++++++++++++++++++++++++++++
drivers/staging/yaffs2/yaffs_nameval.h | 26 ++++
2 files changed, 223 insertions(+), 0 deletions(-)
create mode 100644 drivers/staging/yaffs2/yaffs_nameval.c
create mode 100644 drivers/staging/yaffs2/yaffs_nameval.h
diff --git a/drivers/staging/yaffs2/yaffs_nameval.c b/drivers/staging/yaffs2/yaffs_nameval.c
new file mode 100644
index 0000000..a4ed297
--- /dev/null
+++ b/drivers/staging/yaffs2/yaffs_nameval.c
@@ -0,0 +1,197 @@
+/*
+ * 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@...ph1.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;
+}
diff --git a/drivers/staging/yaffs2/yaffs_nameval.h b/drivers/staging/yaffs2/yaffs_nameval.h
new file mode 100644
index 0000000..bd80859
--- /dev/null
+++ b/drivers/staging/yaffs2/yaffs_nameval.h
@@ -0,0 +1,26 @@
+/*
+ * 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@...ph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR *name);
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
--
1.7.3.2.146.gca209
--
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