7b69f1af91
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3428 42af7a65-404d-4744-a932-0658087f49c3
980 lines
26 KiB
C
980 lines
26 KiB
C
/****************************************************************************
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* rm/romfs/fs_romfsutil.h
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*
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* References: Linux/Documentation/filesystems/romfs.txt
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/ioctl.h>
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#include <nuttx/dirent.h>
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#include "fs_romfs.h"
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: romfs_swap32
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*
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* Desciption:
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* Convert the 32-bit big endian value to little endian
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*
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****************************************************************************/
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#ifndef CONFIG_ENDIAN_BIG
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static inline uint32_t romfs_swap32(uint32_t value)
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{
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return ((((value) & 0x000000ff) << 24) | (((value) & 0x0000ff00) << 8) |
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(((value) & 0x00ff0000) >> 8) | (((value) & 0xff000000) >> 24));
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}
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#endif
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/****************************************************************************
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* Name: romfs_devread32
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*
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* Desciption:
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* Read the big-endian 32-bit value from the mount device buffer
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*
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* Assumption:
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* All values are aligned to 32-bit boundaries
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*
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****************************************************************************/
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static uint32_t romfs_devread32(struct romfs_mountpt_s *rm, int ndx)
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{
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/* Extract the value */
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uint32_t value = *(uint32_t*)&rm->rm_buffer[ndx];
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/* Value is begin endian -- return the native host endian-ness. */
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#ifdef CONFIG_ENDIAN_BIG
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return value;
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#else
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return romfs_swap32(value);
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#endif
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}
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/****************************************************************************
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* Name: romfs_checkentry
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*
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* Desciption:
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* Check if the entry at offset is a directory or file path segment
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*
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****************************************************************************/
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static inline int romfs_checkentry(struct romfs_mountpt_s *rm, uint32_t offset,
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const char *entryname, int entrylen,
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struct romfs_dirinfo_s *dirinfo)
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{
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char name[NAME_MAX+1];
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uint32_t linkoffset;
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uint32_t next;
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uint32_t info;
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uint32_t size;
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int ret;
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/* Parse the directory entry at this offset (which may be re-directed
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* to some other entry if HARLINKED).
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*/
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ret = romfs_parsedirentry(rm, offset, &linkoffset, &next, &info, &size);
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if (ret < 0)
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{
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return ret;
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}
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/* Now we are pointing to the real entry of interest. Is it a
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* directory? Or a file?
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*/
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if (IS_DIRECTORY(next) || IS_FILE(next))
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{
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/* Get the name of the directory entry. */
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ret = romfs_parsefilename(rm, offset, name);
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if (ret < 0)
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{
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return ret;
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}
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/* Then check if this the name segment we are looking for. The
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* string comparison is awkward because there is no terminator
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* on entryname (there is a terminator on name, however)
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*/
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if (memcmp(entryname, name, entrylen) == 0 &&
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strlen(name) == entrylen)
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{
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/* Found it -- save the component info and return success */
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if (IS_DIRECTORY(next))
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{
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dirinfo->rd_dir.fr_firstoffset = info;
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dirinfo->rd_dir.fr_curroffset = info;
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dirinfo->rd_size = 0;
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}
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else
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{
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dirinfo->rd_dir.fr_curroffset = offset;
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dirinfo->rd_size = size;
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}
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dirinfo->rd_next = next;
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return OK;
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}
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}
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/* The entry is not a directory or it does not have the matching name */
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return -ENOENT;
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}
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/****************************************************************************
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* Name: romfs_devcacheread
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*
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* Desciption:
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* Read the specified sector for specified offset into the sector cache.
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* Return the index into the sector corresponding to the offset
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*
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****************************************************************************/
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int16_t romfs_devcacheread(struct romfs_mountpt_s *rm, uint32_t offset)
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{
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uint32_t sector;
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int ret;
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/* rm->rm_cachesector holds the current sector that is buffer in or referenced
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* by rm->tm_buffer. If the requested sector is the same as this sector,
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* then we do nothing.
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*/
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sector = SEC_NSECTORS(rm, offset);
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if (rm->rm_cachesector != sector)
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{
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/* Check the access mode */
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if (rm->rm_xipbase)
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{
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/* In XIP mode, rf_buffer is just an offset pointer into the device
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* address space.
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*/
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rm->rm_buffer = rm->rm_xipbase + SEC_ALIGN(rm, offset);
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}
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else
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{
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/* In non-XIP mode, we will have to read the new sector.*/
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ret = romfs_hwread(rm, rm->rm_buffer, sector, 1);
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if (ret < 0)
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{
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return (int16_t)ret;
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}
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}
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/* Update the cached sector number */
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rm->rm_cachesector = sector;
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}
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/* Return the offset */
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return offset & SEC_NDXMASK(rm);
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}
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/****************************************************************************
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* Name: romfs_followhardlinks
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*
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* Desciption:
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* Given the offset to a file header, check if the file is a hardlink.
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* If so, traverse the hard links until the terminal, non-linked header
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* so found and return that offset.
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*
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****************************************************************************/
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static int romfs_followhardlinks(struct romfs_mountpt_s *rm, uint32_t offset,
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uint32_t *poffset)
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{
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uint32_t next;
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int16_t ndx;
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int i;
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/* Loop while we are redirected by hardlinks */
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for (i = 0; i < ROMF_MAX_LINKS; i++)
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{
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/* Read the sector containing the offset into memory */
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ndx = romfs_devcacheread(rm, offset);
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if (ndx < 0)
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{
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return ndx;
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}
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/* Check if this is a hard link */
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next = romfs_devread32(rm, ndx + ROMFS_FHDR_NEXT);
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if (!IS_HARDLINK(next))
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{
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*poffset = offset;
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return OK;
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}
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/* Follow the hard-link */
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offset = romfs_devread32(rm, ndx + ROMFS_FHDR_INFO);
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}
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return -ELOOP;
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}
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/****************************************************************************
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* Name: romfs_searchdir
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*
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* Desciption:
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* This is part of the romfs_finddirentry log. Search the directory
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* beginning at dirinfo->fr_firstoffset for entryname.
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*
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****************************************************************************/
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static inline int romfs_searchdir(struct romfs_mountpt_s *rm,
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const char *entryname, int entrylen,
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struct romfs_dirinfo_s *dirinfo)
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{
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uint32_t offset;
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uint32_t next;
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int16_t ndx;
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int ret;
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/* Then loop through the current directory until the directory
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* with the matching name is found. Or until all of the entries
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* the directory have been examined.
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*/
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offset = dirinfo->rd_dir.fr_firstoffset;
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do
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{
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/* Read the sector into memory (do this before calling
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* romfs_checkentry() so we won't have to read the sector
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* twice in the event that the offset refers to a hardlink).
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*/
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ndx = romfs_devcacheread(rm, offset);
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if (ndx < 0)
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{
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return ndx;
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}
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/* Because everything is chunked and aligned to 16-bit boundaries,
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* we know that most the basic node info fits into the sector.
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*/
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next = romfs_devread32(rm, ndx + ROMFS_FHDR_NEXT) & RFNEXT_OFFSETMASK;
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/* Check if the name this entry is a directory with the matching
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* name
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*/
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ret = romfs_checkentry(rm, offset, entryname, entrylen, dirinfo);
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if (ret == OK)
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{
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/* Its a match! Return success */
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return OK;
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}
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/* No match... select the offset to the next entry */
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offset = next;
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}
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while (next != 0);
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/* There is nothing in this directoy with that name */
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return -ENOENT;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: romfs_semtake
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****************************************************************************/
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void romfs_semtake(struct romfs_mountpt_s *rm)
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{
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/* Take the semaphore (perhaps waiting) */
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while (sem_wait(&rm->rm_sem) != 0)
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{
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/* The only case that an error should occur here is if
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* the wait was awakened by a signal.
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*/
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ASSERT(*get_errno_ptr() == EINTR);
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}
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}
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/****************************************************************************
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* Name: romfs_semgive
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****************************************************************************/
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void romfs_semgive(struct romfs_mountpt_s *rm)
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{
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sem_post(&rm->rm_sem);
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}
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/****************************************************************************
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* Name: romfs_hwread
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*
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* Desciption: Read the specified sector into the sector buffer
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*
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****************************************************************************/
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int romfs_hwread(struct romfs_mountpt_s *rm, uint8_t *buffer, uint32_t sector,
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unsigned int nsectors)
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{
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int ret = -ENODEV;
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/* Check the access mode */
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if (rm->rm_xipbase)
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{
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/* In XIP mode, we just copy the requested data */
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memcpy(buffer,
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rm->rm_xipbase + sector*rm->rm_hwsectorsize,
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nsectors*rm->rm_hwsectorsize);
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ret = OK;
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}
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else
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{
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/* In non-XIP mode, we have to read the data from the device */
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struct inode *inode = rm->rm_blkdriver;
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ssize_t nsectorsread;
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DEBUGASSERT(inode);
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if (inode->u.i_bops && inode->u.i_bops->read)
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{
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nsectorsread =
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inode->u.i_bops->read(inode, buffer, sector, nsectors);
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if (nsectorsread == (ssize_t)nsectors)
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{
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ret = OK;
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}
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else if (nsectorsread < 0)
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{
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ret = nsectorsread;
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}
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}
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}
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return ret;
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}
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/****************************************************************************
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* Name: romfs_filecacheread
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*
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* Desciption:
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* Read the specified sector into the sector cache
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*
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****************************************************************************/
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int romfs_filecacheread(struct romfs_mountpt_s *rm, struct romfs_file_s *rf, uint32_t sector)
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{
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int ret;
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fvdbg("sector: %d cached: %d sectorsize: %d XIP base: %p buffer: %p\n",
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sector, rf->rf_cachesector, rm->rm_hwsectorsize,
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rm->rm_xipbase, rf->rf_buffer);
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/* rf->rf_cachesector holds the current sector that is buffer in or referenced
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* by rf->rf_buffer. If the requested sector is the same as this sector,
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* then we do nothing.
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*/
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if (rf->rf_cachesector != sector)
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{
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/* Check the access mode */
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if (rm->rm_xipbase)
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{
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/* In XIP mode, rf_buffer is just an offset pointer into the device
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* address space.
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*/
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rf->rf_buffer = rm->rm_xipbase + sector * rm->rm_hwsectorsize;
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fvdbg("XIP buffer: %p\n", rf->rf_buffer);
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}
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else
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{
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/* In non-XIP mode, we will have to read the new sector.*/
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fvdbg("Calling romfs_hwread\n");
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ret = romfs_hwread(rm, rf->rf_buffer, sector, 1);
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if (ret < 0)
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{
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fdbg("romfs_hwread failed: %d\n", ret);
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return ret;
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}
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}
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/* Update the cached sector number */
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rf->rf_cachesector = sector;
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}
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return OK;
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}
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/****************************************************************************
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* Name: romfs_hwconfigure
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*
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* Desciption:
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* This function is called as part of the ROMFS mount operation It
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* configures the ROMFS filestem for use on this block driver. This includes
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* the accounting for the geometry of the device, setting up any XIP modes
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* of operation, and/or allocating any cache buffers.
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*
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****************************************************************************/
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int romfs_hwconfigure(struct romfs_mountpt_s *rm)
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{
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struct inode *inode = rm->rm_blkdriver;
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struct geometry geo;
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int ret;
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/* Get the underlying device geometry */
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#ifdef CONFIG_DEBUG
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if (!inode || !inode->u.i_bops || !inode->u.i_bops->geometry)
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{
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return -ENODEV;
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}
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#endif
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ret = inode->u.i_bops->geometry(inode, &geo);
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if (ret != OK)
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{
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return ret;
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}
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if (!geo.geo_available)
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{
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return -EBUSY;
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}
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/* Save that information in the mount structure */
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rm->rm_hwsectorsize = geo.geo_sectorsize;
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rm->rm_hwnsectors = geo.geo_nsectors;
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/* Determine if block driver supports the XIP mode of operation */
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rm->rm_cachesector = (uint32_t)-1;
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if (inode->u.i_bops->ioctl)
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{
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ret = inode->u.i_bops->ioctl(inode, BIOC_XIPBASE,
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(unsigned long)&rm->rm_xipbase);
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if (ret == OK && rm->rm_xipbase)
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{
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/* Yes.. Then we will directly access the media (vs.
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* copying into an allocated sector buffer.
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*/
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rm->rm_buffer = rm->rm_xipbase;
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rm->rm_cachesector = 0;
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return OK;
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}
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}
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/* Allocate the device cache buffer for normal sector accesses */
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rm->rm_buffer = (uint8_t*)malloc(rm->rm_hwsectorsize);
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if (!rm->rm_buffer)
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{
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return -ENOMEM;
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}
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return OK;
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}
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/****************************************************************************
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* Name: romfs_fsconfigure
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*
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* Desciption:
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* This function is called as part of the ROMFS mount operation It
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* sets up the mount structure to include configuration information contained
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* in the ROMFS header. This is the place where we actually determine if
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* the media contains a ROMFS filesystem.
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*
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****************************************************************************/
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int romfs_fsconfigure(struct romfs_mountpt_s *rm)
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{
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const char *name;
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int16_t ndx;
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/* Then get information about the ROMFS filesystem on the devices managed
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* by this block driver. Read sector zero which contains the volume header.
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*/
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ndx = romfs_devcacheread(rm, 0);
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if (ndx < 0)
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{
|
|
return ndx;
|
|
}
|
|
|
|
/* Verify the magic number at that identifies this as a ROMFS filesystem */
|
|
|
|
if (memcmp(rm->rm_buffer, ROMFS_VHDR_MAGIC, 8) != 0)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Then extract the values we need from the header and return success */
|
|
|
|
rm->rm_volsize = romfs_devread32(rm, ROMFS_VHDR_SIZE);
|
|
|
|
/* The root directory entry begins right after the header */
|
|
|
|
name = (const char*)&rm->rm_buffer[ROMFS_VHDR_VOLNAME];
|
|
rm->rm_rootoffset = ROMFS_ALIGNUP(ROMFS_VHDR_VOLNAME + strlen(name) + 1);
|
|
|
|
/* and return success */
|
|
|
|
rm->rm_mounted = true;
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_ffileconfigure
|
|
*
|
|
* Desciption:
|
|
* This function is called as part of the ROMFS file open operation It
|
|
* sets up the file structure to handle buffer appropriately, depending
|
|
* upon XIP mode or not.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_fileconfigure(struct romfs_mountpt_s *rm, struct romfs_file_s *rf)
|
|
{
|
|
/* Check if XIP access mode is supported. If so, then we do not need
|
|
* to allocate anything.
|
|
*/
|
|
|
|
if (rm->rm_xipbase)
|
|
{
|
|
/* We'll put a valid address in rf_buffer just in case. */
|
|
|
|
rf->rf_cachesector = 0;
|
|
rf->rf_buffer = rm->rm_xipbase;
|
|
}
|
|
else
|
|
{
|
|
/* Nothing in the cache buffer */
|
|
|
|
rf->rf_cachesector = (uint32_t)-1;
|
|
|
|
/* Create a file buffer to support partial sector accesses */
|
|
|
|
rf->rf_buffer = (uint8_t*)malloc(rm->rm_hwsectorsize);
|
|
if (!rf->rf_buffer)
|
|
{
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_checkmount
|
|
*
|
|
* Desciption: Check if the mountpoint is still valid.
|
|
*
|
|
* The caller should hold the mountpoint semaphore
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_checkmount(struct romfs_mountpt_s *rm)
|
|
{
|
|
struct romfs_file_s *file;
|
|
struct inode *inode;
|
|
struct geometry geo;
|
|
int ret;
|
|
|
|
/* If the fs_mounted flag is false, then we have already handled the loss
|
|
* of the mount.
|
|
*/
|
|
|
|
DEBUGASSERT(rm && rm->rm_blkdriver);
|
|
if (rm->rm_mounted)
|
|
{
|
|
/* We still think the mount is healthy. Check an see if this is
|
|
* still the case
|
|
*/
|
|
|
|
inode = rm->rm_blkdriver;
|
|
if (inode->u.i_bops && inode->u.i_bops->geometry)
|
|
{
|
|
ret = inode->u.i_bops->geometry(inode, &geo);
|
|
if (ret == OK && geo.geo_available && !geo.geo_mediachanged)
|
|
{
|
|
return OK;
|
|
}
|
|
}
|
|
|
|
/* If we get here, the mount is NOT healthy */
|
|
|
|
rm->rm_mounted = false;
|
|
|
|
/* Make sure that this is flagged in every opened file */
|
|
|
|
for (file = rm->rm_head; file; file = file->rf_next)
|
|
{
|
|
file->rf_open = false;
|
|
}
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_finddirentry
|
|
*
|
|
* Desciption:
|
|
* Given a path to something that may or may not be in the file system,
|
|
* return the directory entry of the item.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_finddirentry(struct romfs_mountpt_s *rm, struct romfs_dirinfo_s *dirinfo,
|
|
const char *path)
|
|
{
|
|
const char *entryname;
|
|
const char *terminator;
|
|
int entrylen;
|
|
int ret;
|
|
|
|
/* Start with the first element after the root directory */
|
|
|
|
dirinfo->rd_dir.fr_firstoffset = rm->rm_rootoffset;
|
|
dirinfo->rd_dir.fr_curroffset = rm->rm_rootoffset;
|
|
dirinfo->rd_next = RFNEXT_DIRECTORY;
|
|
dirinfo->rd_size = 0;
|
|
|
|
/* The root directory is a special case */
|
|
|
|
if (!path || path[0] == '\0')
|
|
{
|
|
return OK;
|
|
}
|
|
|
|
/* Then loop for each directory/file component in the full path */
|
|
|
|
entryname = path;
|
|
terminator = NULL;
|
|
|
|
for (;;)
|
|
{
|
|
/* Find the start of the next path component */
|
|
|
|
while (*entryname == '/') entryname++;
|
|
|
|
/* Find the end of the next path component */
|
|
|
|
terminator = strchr(entryname, '/');
|
|
if (!terminator)
|
|
{
|
|
entrylen = strlen(entryname);
|
|
}
|
|
else
|
|
{
|
|
entrylen = terminator - entryname;
|
|
}
|
|
|
|
/* Long path segment names will be truncated to NAME_MAX */
|
|
|
|
if (entrylen > NAME_MAX)
|
|
{
|
|
entrylen = NAME_MAX;
|
|
}
|
|
|
|
/* Then find the entry in the current directory with the
|
|
* matching name.
|
|
*/
|
|
|
|
ret = romfs_searchdir(rm, entryname, entrylen, dirinfo);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Was that the last path component? */
|
|
|
|
if (!terminator)
|
|
{
|
|
/* Yes.. return success */
|
|
|
|
return OK;
|
|
}
|
|
|
|
/* No... If that was not the last path component, then it had
|
|
* better have been a directory
|
|
*/
|
|
|
|
if (!IS_DIRECTORY(dirinfo->rd_next))
|
|
{
|
|
return -ENOTDIR;
|
|
}
|
|
|
|
/* Setup to search the next directory for the next component
|
|
* of the path
|
|
*/
|
|
|
|
entryname = terminator;
|
|
}
|
|
|
|
return ERROR; /* Won't get here */
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_parsedirentry
|
|
*
|
|
* Desciption:
|
|
* Return the directory entry at this offset. If rf is NULL, then the
|
|
* mount device resources are used. Otherwise, file resources are used.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_parsedirentry(struct romfs_mountpt_s *rm, uint32_t offset, uint32_t *poffset,
|
|
uint32_t *pnext, uint32_t *pinfo, uint32_t *psize)
|
|
{
|
|
uint32_t save;
|
|
uint32_t next;
|
|
int16_t ndx;
|
|
int ret;
|
|
|
|
/* Read the sector into memory */
|
|
|
|
ndx = romfs_devcacheread(rm, offset);
|
|
if (ndx < 0)
|
|
{
|
|
return ndx;
|
|
}
|
|
|
|
/* Yes.. Save the first 'next' value. That has the offset needed to
|
|
* traverse the parent directory. But we may need to change the type
|
|
* after we follow the hard links.
|
|
*/
|
|
|
|
save = romfs_devread32(rm, ndx + ROMFS_FHDR_NEXT);
|
|
|
|
/* Traverse hardlinks as necesssary to get to the real file header */
|
|
|
|
ret = romfs_followhardlinks(rm, offset, poffset);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Because everything is chunked and aligned to 16-bit boundaries,
|
|
* we know that most the basic node info fits into the sector. The
|
|
* associated name may not, however.
|
|
*/
|
|
|
|
next = romfs_devread32(rm, ndx + ROMFS_FHDR_NEXT);
|
|
*pnext = (save & RFNEXT_OFFSETMASK) | (next & RFNEXT_ALLMODEMASK);
|
|
*pinfo = romfs_devread32(rm, ndx + ROMFS_FHDR_INFO);
|
|
*psize = romfs_devread32(rm, ndx + ROMFS_FHDR_SIZE);
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_parsefilename
|
|
*
|
|
* Desciption:
|
|
* Return the filename from directory entry at this offset
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_parsefilename(struct romfs_mountpt_s *rm, uint32_t offset, char *pname)
|
|
{
|
|
int16_t ndx;
|
|
uint16_t namelen;
|
|
uint16_t chunklen;
|
|
bool done;
|
|
|
|
/* Loop until the whole name is obtained or until NAME_MAX characters
|
|
* of the name have been parsed.
|
|
*/
|
|
|
|
offset += ROMFS_FHDR_NAME;
|
|
for (namelen = 0, done = false; namelen < NAME_MAX && !done;)
|
|
{
|
|
/* Read the sector into memory */
|
|
|
|
ndx = romfs_devcacheread(rm, offset);
|
|
if (ndx < 0)
|
|
{
|
|
return ndx;
|
|
}
|
|
|
|
/* Is the name terminated in this 16-byte block */
|
|
|
|
if (rm->rm_buffer[ndx + 15] == '\0')
|
|
{
|
|
/* Yes.. then this chunk is less than 16 */
|
|
|
|
chunklen = strlen((char*)&rm->rm_buffer[ndx]);
|
|
done = true;
|
|
}
|
|
else
|
|
{
|
|
/* No.. then this chunk is 16 bytes in length */
|
|
|
|
chunklen = 16;
|
|
}
|
|
|
|
/* Check if we would exceed the NAME_MAX */
|
|
|
|
if (namelen + chunklen > NAME_MAX)
|
|
{
|
|
chunklen = NAME_MAX - namelen;
|
|
done = true;
|
|
}
|
|
|
|
/* Copy the chunk */
|
|
|
|
memcpy(&pname[namelen], &rm->rm_buffer[ndx], chunklen);
|
|
namelen += chunklen;
|
|
}
|
|
|
|
/* Terminate the name (NAME_MAX+1 chars total) and return success */
|
|
|
|
pname[namelen] = '\0';
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: romfs_datastart
|
|
*
|
|
* Desciption:
|
|
* Given the offset to a file header, return the offset to the start of
|
|
* the file data
|
|
*
|
|
****************************************************************************/
|
|
|
|
int romfs_datastart(struct romfs_mountpt_s *rm, uint32_t offset, uint32_t *start)
|
|
{
|
|
int16_t ndx;
|
|
int ret;
|
|
|
|
/* Traverse hardlinks as necesssary to get to the real file header */
|
|
|
|
ret = romfs_followhardlinks(rm, offset, &offset);
|
|
if (ret < 0)
|
|
{
|
|
return ret;
|
|
}
|
|
|
|
/* Loop until the header size is obtained. */
|
|
|
|
offset += ROMFS_FHDR_NAME;
|
|
for (;;)
|
|
{
|
|
/* Read the sector into memory */
|
|
|
|
ndx = romfs_devcacheread(rm, offset);
|
|
if (ndx < 0)
|
|
{
|
|
return ndx;
|
|
}
|
|
|
|
/* Get the offset to the next chunk */
|
|
|
|
offset += 16;
|
|
if (offset >= rm->rm_volsize)
|
|
{
|
|
return -EIO;
|
|
}
|
|
|
|
/* Is the name terminated in this 16-byte block */
|
|
|
|
if (rm->rm_buffer[ndx + 15] == '\0')
|
|
{
|
|
/* Yes.. then the data starts at the next chunk */
|
|
|
|
*start = offset;
|
|
return OK;
|
|
}
|
|
}
|
|
|
|
return -EINVAL; /* Won't get here */
|
|
}
|
|
|