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uboot-1.1.4-kirkwood/fs/fdos/vfat.c

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u-boot 1.1.4
2024-01-07 23:57:24 +01:00
/*
* (C) Copyright 2002
* St<EFBFBD>ubli Faverges - <www.staubli.com>
* Pierre AUBERT p.aubert@staubli.com
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <config.h>
#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
#include <linux/ctype.h>
#include "dos.h"
#include "fdos.h"
static int dir_read (Fs_t *fs,
Slot_t *dir,
Directory_t *dirent,
int num,
struct vfat_state *v);
static int unicode_read (char *in, char *out, int num);
static int match (const char *s, const char *p);
static unsigned char sum_shortname (char *name);
static int check_vfat (struct vfat_state *v, Directory_t *dir);
static char *conv_name (char *name, char *ext, char Case, char *ans);
/*-----------------------------------------------------------------------------
* clear_vfat --
*-----------------------------------------------------------------------------
*/
static void clear_vfat (struct vfat_state *v)
{
v -> subentries = 0;
v -> status = 0;
}
/*-----------------------------------------------------------------------------
* vfat_lookup --
*-----------------------------------------------------------------------------
*/
int vfat_lookup (Slot_t *dir,
Fs_t *fs,
Directory_t *dirent,
int *entry,
int *vfat_start,
char *filename,
int flags,
char *outname,
Slot_t *file)
{
int found;
struct vfat_state vfat;
char newfile [VSE_NAMELEN];
int vfat_present = 0;
if (*entry == -1) {
return -1;
}
found = 0;
clear_vfat (&vfat);
while (1) {
if (dir_read (fs, dir, dirent, *entry, &vfat) < 0) {
if (vfat_start) {
*vfat_start = *entry;
}
break;
}
(*entry)++;
/* Empty slot */
if (dirent -> name[0] == '\0'){
if (vfat_start == 0) {
break;
}
continue;
}
if (dirent -> attr == ATTR_VSE) {
/* VSE entry, continue */
continue;
}
if ( (dirent -> name [0] == DELMARK) ||
((dirent -> attr & ATTR_DIRECTORY) != 0 &&
(flags & ACCEPT_DIR) == 0) ||
((dirent -> attr & ATTR_VOLUME) != 0 &&
(flags & ACCEPT_LABEL) == 0) ||
(((dirent -> attr & (ATTR_DIRECTORY | ATTR_VOLUME)) == 0) &&
(flags & ACCEPT_PLAIN) == 0)) {
clear_vfat (&vfat);
continue;
}
vfat_present = check_vfat (&vfat, dirent);
if (vfat_start) {
*vfat_start = *entry - 1;
if (vfat_present) {
*vfat_start -= vfat.subentries;
}
}
if (dirent -> attr & ATTR_VOLUME) {
strncpy (newfile, dirent -> name, 8);
newfile [8] = '\0';
strncat (newfile, dirent -> ext, 3);
newfile [11] = '\0';
}
else {
conv_name (dirent -> name, dirent -> ext, dirent -> Case, newfile);
}
if (flags & MATCH_ANY) {
found = 1;
break;
}
if ((vfat_present && match (vfat.name, filename)) ||
(match (newfile, filename))) {
found = 1;
break;
}
clear_vfat (&vfat);
}
if (found) {
if ((flags & DO_OPEN) && file) {
if (open_file (file, dirent) < 0) {
return (-1);
}
}
if (outname) {
if (vfat_present) {
strcpy (outname, vfat.name);
}
else {
strcpy (outname, newfile);
}
}
return (0); /* File found */
} else {
*entry = -1;
return -1; /* File not found */
}
}
/*-----------------------------------------------------------------------------
* dir_read -- Read one directory entry
*-----------------------------------------------------------------------------
*/
static int dir_read (Fs_t *fs,
Slot_t *dir,
Directory_t *dirent,
int num,
struct vfat_state *v)
{
/* read the directory entry */
if (read_file (fs,
dir,
(char *)dirent,
num * MDIR_SIZE,
MDIR_SIZE) != MDIR_SIZE) {
return (-1);
}
if (v && (dirent -> attr == ATTR_VSE)) {
struct vfat_subentry *vse;
unsigned char id, last_flag;
char *c;
vse = (struct vfat_subentry *) dirent;
id = vse -> id & VSE_MASK;
last_flag = (vse -> id & VSE_LAST);
if (id > MAX_VFAT_SUBENTRIES) {
/* Invalid VSE entry */
return (-1);
}
/* Decode VSE */
if(v -> sum != vse -> sum) {
clear_vfat (v);
v -> sum = vse -> sum;
}
v -> status |= 1 << (id - 1);
if (last_flag) {
v -> subentries = id;
}
c = &(v -> name [VSE_NAMELEN * (id - 1)]);
c += unicode_read (vse->text1, c, VSE1SIZE);
c += unicode_read (vse->text2, c, VSE2SIZE);
c += unicode_read (vse->text3, c, VSE3SIZE);
if (last_flag) {
*c = '\0'; /* Null terminate long name */
}
}
return (0);
}
/*-----------------------------------------------------------------------------
* unicode_read --
*-----------------------------------------------------------------------------
*/
static int unicode_read (char *in, char *out, int num)
{
int j;
for (j = 0; j < num; ++j) {
if (in [1])
*out = '_';
else
*out = in [0];
out ++;
in += 2;
}
return num;
}
/*-----------------------------------------------------------------------------
* match --
*-----------------------------------------------------------------------------
*/
static int match (const char *s, const char *p)
{
for (; *p != '\0'; ) {
if (toupper (*s) != toupper (*p)) {
return (0);
}
p++;
s++;
}
if (*s != '\0') {
return (0);
}
else {
return (1);
}
}
/*-----------------------------------------------------------------------------
* sum_shortname --
*-----------------------------------------------------------------------------
*/
static unsigned char sum_shortname (char *name)
{
unsigned char sum;
int j;
for (j = sum = 0; j < 11; ++j) {
sum = ((sum & 1) ? 0x80 : 0) + (sum >> 1) +
(name [j] ? name [j] : ' ');
}
return (sum);
}
/*-----------------------------------------------------------------------------
* check_vfat --
* Return 1 if long name is valid, 0 else
*-----------------------------------------------------------------------------
*/
static int check_vfat (struct vfat_state *v, Directory_t *dir)
{
char name[12];
if (v -> subentries == 0) {
return 0;
}
strncpy (name, dir -> name, 8);
strncpy (name + 8, dir -> ext, 3);
name [11] = '\0';
if (v -> sum != sum_shortname (name)) {
return 0;
}
if( (v -> status & ((1 << v -> subentries) - 1)) !=
(1 << v -> subentries) - 1) {
return 0;
}
v->name [VSE_NAMELEN * v -> subentries] = 0;
return 1;
}
/*-----------------------------------------------------------------------------
* conv_name --
*-----------------------------------------------------------------------------
*/
static char *conv_name (char *name, char *ext, char Case, char *ans)
{
char tname [9], text [4];
int i;
i = 0;
while (i < 8 && name [i] != ' ' && name [i] != '\0') {
tname [i] = name [i];
i++;
}
tname [i] = '\0';
if (Case & BASECASE) {
for (i = 0; i < 8 && tname [i]; i++) {
tname [i] = tolower (tname [i]);
}
}
i = 0;
while (i < 3 && ext [i] != ' ' && ext [i] != '\0') {
text [i] = ext [i];
i++;
}
text [i] = '\0';
if (Case & EXTCASE){
for (i = 0; i < 3 && text [i]; i++) {
text [i] = tolower (text [i]);
}
}
if (*text) {
strcpy (ans, tname);
strcat (ans, ".");
strcat (ans, text);
}
else {
strcpy(ans, tname);
}
return (ans);
}
#endif
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