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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-04-28 19:26:46 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2011-04-28 19:26:46 +0000 |
commit | f5deadfbb2ea797607ce7646c2bca1fdfe74c3c2 (patch) | |
tree | 7b25391c6c8172936f0c27efae5b40503b7d03c4 /nuttx/fs/nxffs/nxffs_util.c | |
parent | b501edd4c0f7b4fffc6d187ee5e0bd862d381a79 (diff) | |
download | px4-nuttx-f5deadfbb2ea797607ce7646c2bca1fdfe74c3c2.tar.gz px4-nuttx-f5deadfbb2ea797607ce7646c2bca1fdfe74c3c2.tar.bz2 px4-nuttx-f5deadfbb2ea797607ce7646c2bca1fdfe74c3c2.zip |
Add first NXFFS files
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3536 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/fs/nxffs/nxffs_util.c')
-rw-r--r-- | nuttx/fs/nxffs/nxffs_util.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/nuttx/fs/nxffs/nxffs_util.c b/nuttx/fs/nxffs/nxffs_util.c new file mode 100644 index 000000000..9eea32243 --- /dev/null +++ b/nuttx/fs/nxffs/nxffs_util.c @@ -0,0 +1,112 @@ +/**************************************************************************** + * fs/nxffs/nxffs_util.c + * + * Copyright (C) 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * References: Linux/Documentation/filesystems/romfs.txt + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <string.h> +#include <errno.h> +#include <assert.h> +#include <debug.h> + +#include <nuttx/mtd.h> + +#include "nxffs.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Types + ****************************************************************************/ + +/**************************************************************************** + * Public Variables + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: nxffs_rdle16 + * + * Description: + * Get a (possibly unaligned) 16-bit little endian value. + * + * Input Parameters: + * val - A pointer to the first byte of the little endian value. + * + * Returned Values: + * A uint16_t representing the whole 16-bit integer value + * + ****************************************************************************/ + +uint16_t nxffs_rdle16(const uint8_t *val) +{ + return (uint16_t)val[1] << 8 | (uint16_t)val[0]; +} + +/**************************************************************************** + * Name: nxffs_rdle32 + * + * Description: + * Get a (possibly unaligned) 32-bit little endian value. + * + * Input Parameters: + * val - A pointer to the first byte of the little endian value. + * + * Returned Values: + * A uint32_t representing the whole 32-bit integer value + * + ****************************************************************************/ + +uint32_t nxffs_rdle32(const uint8_t *val) +{ + /* Little endian means LS halfword first in byte stream */ + + return (uint32_t)nxffs_rdle16(&val[2]) << 16 | (uint32_t)nxffs_rdle16(val); +} + |