mirror of
https://github.com/AsahiLinux/u-boot
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345 lines
8.2 KiB
C
345 lines
8.2 KiB
C
/*
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* (C) Copyright 2002
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* Stäubli Faverges - <www.staubli.com>
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* Pierre AUBERT p.aubert@staubli.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <malloc.h>
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#include "dos.h"
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#include "fdos.h"
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static int cache_sect;
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static unsigned char cache [SZ_STD_SECTOR];
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#define min(x,y) ((x)<(y)?(x):(y))
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static int descend (Slot_t *parent,
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Fs_t *fs,
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char *path);
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/*-----------------------------------------------------------------------------
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* init_subdir --
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*-----------------------------------------------------------------------------
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*/
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void init_subdir (void)
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{
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cache_sect = -1;
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}
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/*-----------------------------------------------------------------------------
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* basename --
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*-----------------------------------------------------------------------------
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*/
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char *basename (char *name)
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{
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register char *cptr;
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if (!name || !*name) {
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return ("");
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}
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for (cptr= name; *cptr++; );
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while (--cptr >= name) {
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if (*cptr == '/') {
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return (cptr + 1);
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}
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}
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return(name);
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}
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/*-----------------------------------------------------------------------------
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* root_map --
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*-----------------------------------------------------------------------------
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*/
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static int root_map (Fs_t *fs, Slot_t *file, int where, int *len)
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{
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*len = min (*len, fs -> dir_len * SZ_STD_SECTOR - where);
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if (*len < 0 ) {
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*len = 0;
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return (-1);
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}
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return fs -> dir_start * SZ_STD_SECTOR + where;
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}
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/*-----------------------------------------------------------------------------
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* normal_map --
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*-----------------------------------------------------------------------------
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*/
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static int normal_map (Fs_t *fs, Slot_t *file, int where, int *len)
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{
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int offset;
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int NrClu;
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unsigned short RelCluNr;
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unsigned short CurCluNr;
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unsigned short NewCluNr;
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unsigned short AbsCluNr;
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int clus_size;
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clus_size = fs -> cluster_size * SZ_STD_SECTOR;
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offset = where % clus_size;
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*len = min (*len, file -> FileSize - where);
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if (*len < 0 ) {
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*len = 0;
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return (0);
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}
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if (file -> FirstAbsCluNr < 2){
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*len = 0;
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return (0);
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}
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RelCluNr = where / clus_size;
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if (RelCluNr >= file -> PreviousRelCluNr){
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CurCluNr = file -> PreviousRelCluNr;
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AbsCluNr = file -> PreviousAbsCluNr;
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} else {
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CurCluNr = 0;
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AbsCluNr = file -> FirstAbsCluNr;
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}
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NrClu = (offset + *len - 1) / clus_size;
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while (CurCluNr <= RelCluNr + NrClu) {
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if (CurCluNr == RelCluNr){
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/* we have reached the beginning of our zone. Save
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* coordinates */
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file -> PreviousRelCluNr = RelCluNr;
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file -> PreviousAbsCluNr = AbsCluNr;
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}
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NewCluNr = fat_decode (fs, AbsCluNr);
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if (NewCluNr == 1 || NewCluNr == 0) {
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PRINTF("Fat problem while decoding %d %x\n",
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AbsCluNr, NewCluNr);
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return (-1);
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}
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if (CurCluNr == RelCluNr + NrClu) {
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break;
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}
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if (CurCluNr < RelCluNr && NewCluNr == FAT12_END) {
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*len = 0;
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return 0;
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}
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if (CurCluNr >= RelCluNr && NewCluNr != AbsCluNr + 1)
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break;
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CurCluNr++;
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AbsCluNr = NewCluNr;
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}
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*len = min (*len, (1 + CurCluNr - RelCluNr) * clus_size - offset);
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return (((file -> PreviousAbsCluNr - 2) * fs -> cluster_size +
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fs -> dir_start + fs -> dir_len) *
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SZ_STD_SECTOR + offset);
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}
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/*-----------------------------------------------------------------------------
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* open_subdir -- open the subdir containing the file
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*-----------------------------------------------------------------------------
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*/
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int open_subdir (File_t *desc)
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{
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char *pathname;
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char *tmp, *s, *path;
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char terminator;
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if ((pathname = (char *)malloc (MAX_PATH)) == NULL) {
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return (-1);
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}
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strcpy (pathname, desc -> name);
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/* Suppress file name */
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tmp = basename (pathname);
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*tmp = '\0';
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/* root directory init */
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desc -> subdir.FirstAbsCluNr = 0;
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desc -> subdir.FileSize = -1;
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desc -> subdir.map = root_map;
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desc -> subdir.dir.attr = ATTR_DIRECTORY;
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tmp = pathname;
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for (s = tmp; ; ++s) {
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if (*s == '/' || *s == '\0') {
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path = tmp;
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terminator = *s;
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*s = '\0';
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if (s != tmp && strcmp (path,".")) {
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if (descend (&desc -> subdir, desc -> fs, path) < 0) {
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free (pathname);
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return (-1);
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}
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}
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if (terminator == 0) {
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break;
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}
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tmp = s + 1;
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}
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}
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free (pathname);
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return (0);
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}
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/*-----------------------------------------------------------------------------
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* descend --
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*-----------------------------------------------------------------------------
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*/
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static int descend (Slot_t *parent,
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Fs_t *fs,
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char *path)
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{
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int entry;
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Slot_t SubDir;
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if(path[0] == '\0' || strcmp (path, ".") == 0) {
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return (0);
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}
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entry = 0;
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if (vfat_lookup (parent,
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fs,
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&(SubDir.dir),
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&entry,
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0,
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path,
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ACCEPT_DIR | SINGLE | DO_OPEN,
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0,
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&SubDir) == 0) {
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*parent = SubDir;
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return (0);
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}
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if (strcmp(path, "..") == 0) {
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parent -> FileSize = -1;
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parent -> FirstAbsCluNr = 0;
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parent -> map = root_map;
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return (0);
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}
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return (-1);
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}
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/*-----------------------------------------------------------------------------
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* open_file --
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*-----------------------------------------------------------------------------
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*/
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int open_file (Slot_t *file, Directory_t *dir)
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{
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int first;
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unsigned long size;
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first = __le16_to_cpu (dir -> start);
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if(first == 0 &&
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(dir -> attr & ATTR_DIRECTORY) != 0) {
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file -> FirstAbsCluNr = 0;
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file -> FileSize = -1;
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file -> map = root_map;
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return (0);
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}
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if ((dir -> attr & ATTR_DIRECTORY) != 0) {
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size = (1UL << 31) - 1;
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}
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else {
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size = __le32_to_cpu (dir -> size);
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}
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file -> map = normal_map;
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file -> FirstAbsCluNr = first;
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file -> PreviousRelCluNr = 0xffff;
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file -> FileSize = size;
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return (0);
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}
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/*-----------------------------------------------------------------------------
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* read_file --
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*-----------------------------------------------------------------------------
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*/
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int read_file (Fs_t *fs,
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Slot_t *file,
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char *buf,
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int where,
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int len)
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{
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int pos;
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int read, nb, sect, offset;
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pos = file -> map (fs, file, where, &len);
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if (pos < 0) {
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return -1;
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}
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if (len == 0) {
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return (0);
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}
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/* Compute sector number */
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sect = pos / SZ_STD_SECTOR;
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offset = pos % SZ_STD_SECTOR;
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read = 0;
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if (offset) {
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/* Read doesn't start at the sector beginning. We need to use our */
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/* cache */
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if (sect != cache_sect) {
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if (dev_read (cache, sect, 1) < 0) {
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return (-1);
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}
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cache_sect = sect;
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}
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nb = min (len, SZ_STD_SECTOR - offset);
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memcpy (buf, cache + offset, nb);
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read += nb;
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len -= nb;
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sect += 1;
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}
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if (len > SZ_STD_SECTOR) {
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nb = (len - 1) / SZ_STD_SECTOR;
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if (dev_read (buf + read, sect, nb) < 0) {
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return ((read) ? read : -1);
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}
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/* update sector position */
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sect += nb;
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/* Update byte position */
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nb *= SZ_STD_SECTOR;
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read += nb;
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len -= nb;
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}
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if (len) {
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if (sect != cache_sect) {
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if (dev_read (cache, sect, 1) < 0) {
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return ((read) ? read : -1);
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cache_sect = -1;
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}
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cache_sect = sect;
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}
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memcpy (buf + read, cache, len);
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read += len;
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}
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return (read);
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}
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