mirror of
https://github.com/AsahiLinux/u-boot
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209 lines
4.4 KiB
C
209 lines
4.4 KiB
C
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/*
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* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
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*
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* Copyright (C) 2002-2011 Aleph One Ltd.
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* for Toby Churchill Ltd and Brightstar Engineering
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*
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* Created by Charles Manning <charles@aleph1.co.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* This simple implementation of a name-value store assumes a small number of
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* values and fits into a small finite buffer.
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*
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* Each attribute is stored as a record:
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* sizeof(int) bytes record size.
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* yaffs_strnlen+1 bytes name null terminated.
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* nbytes value.
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* ----------
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* total size stored in record size
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*
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* This code has not been tested with unicode yet.
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*/
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#include "yaffs_nameval.h"
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#include "yportenv.h"
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static int nval_find(const char *xb, int xb_size, const YCHAR *name,
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int *exist_size)
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{
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int pos = 0;
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int size;
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memcpy(&size, xb, sizeof(int));
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while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
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if (!yaffs_strncmp((YCHAR *) (xb + pos + sizeof(int)),
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name, size)) {
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if (exist_size)
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*exist_size = size;
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return pos;
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}
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pos += size;
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if (pos < xb_size - sizeof(int))
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memcpy(&size, xb + pos, sizeof(int));
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else
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size = 0;
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}
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if (exist_size)
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*exist_size = 0;
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return -ENODATA;
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}
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static int nval_used(const char *xb, int xb_size)
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{
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int pos = 0;
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int size;
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memcpy(&size, xb + pos, sizeof(int));
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while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
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pos += size;
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if (pos < xb_size - sizeof(int))
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memcpy(&size, xb + pos, sizeof(int));
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else
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size = 0;
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}
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return pos;
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}
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int nval_del(char *xb, int xb_size, const YCHAR *name)
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{
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int pos = nval_find(xb, xb_size, name, NULL);
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int size;
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if (pos < 0 || pos >= xb_size)
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return -ENODATA;
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/* Find size, shift rest over this record,
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* then zero out the rest of buffer */
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memcpy(&size, xb + pos, sizeof(int));
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memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
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memset(xb + (xb_size - size), 0, size);
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return 0;
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}
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int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
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int bsize, int flags)
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{
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int pos;
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int namelen = yaffs_strnlen(name, xb_size);
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int reclen;
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int size_exist = 0;
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int space;
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int start;
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pos = nval_find(xb, xb_size, name, &size_exist);
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if (flags & XATTR_CREATE && pos >= 0)
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return -EEXIST;
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if (flags & XATTR_REPLACE && pos < 0)
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return -ENODATA;
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start = nval_used(xb, xb_size);
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space = xb_size - start + size_exist;
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reclen = (sizeof(int) + namelen + 1 + bsize);
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if (reclen > space)
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return -ENOSPC;
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if (pos >= 0) {
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nval_del(xb, xb_size, name);
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start = nval_used(xb, xb_size);
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}
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pos = start;
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memcpy(xb + pos, &reclen, sizeof(int));
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pos += sizeof(int);
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yaffs_strncpy((YCHAR *) (xb + pos), name, reclen);
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pos += (namelen + 1);
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memcpy(xb + pos, buf, bsize);
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return 0;
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}
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int nval_get(const char *xb, int xb_size, const YCHAR * name, char *buf,
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int bsize)
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{
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int pos = nval_find(xb, xb_size, name, NULL);
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int size;
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if (pos >= 0 && pos < xb_size) {
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memcpy(&size, xb + pos, sizeof(int));
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pos += sizeof(int); /* advance past record length */
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size -= sizeof(int);
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/* Advance over name string */
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while (xb[pos] && size > 0 && pos < xb_size) {
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pos++;
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size--;
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}
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/*Advance over NUL */
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pos++;
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size--;
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/* If bsize is zero then this is a size query.
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* Return the size, but don't copy.
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*/
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if (!bsize)
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return size;
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if (size <= bsize) {
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memcpy(buf, xb + pos, size);
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return size;
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}
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}
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if (pos >= 0)
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return -ERANGE;
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return -ENODATA;
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}
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int nval_list(const char *xb, int xb_size, char *buf, int bsize)
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{
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int pos = 0;
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int size;
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int name_len;
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int ncopied = 0;
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int filled = 0;
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memcpy(&size, xb + pos, sizeof(int));
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while (size > sizeof(int) &&
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size <= xb_size &&
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(pos + size) < xb_size &&
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!filled) {
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pos += sizeof(int);
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size -= sizeof(int);
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name_len = yaffs_strnlen((YCHAR *) (xb + pos), size);
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if (ncopied + name_len + 1 < bsize) {
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memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
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buf += name_len;
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*buf = '\0';
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buf++;
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if (sizeof(YCHAR) > 1) {
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*buf = '\0';
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buf++;
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}
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ncopied += (name_len + 1);
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} else {
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filled = 1;
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}
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pos += size;
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if (pos < xb_size - sizeof(int))
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memcpy(&size, xb + pos, sizeof(int));
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else
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size = 0;
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}
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return ncopied;
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}
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int nval_hasvalues(const char *xb, int xb_size)
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{
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return nval_used(xb, xb_size) > 0;
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}
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