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-rw-r--r--fs/fdos/vfat.c357
1 files changed, 357 insertions, 0 deletions
diff --git a/fs/fdos/vfat.c b/fs/fdos/vfat.c
new file mode 100644
index 0000000..f828795
--- /dev/null
+++ b/fs/fdos/vfat.c
@@ -0,0 +1,357 @@
+/*
+ * (C) Copyright 2002
+ * Stäubli 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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