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-rw-r--r--fs/fdos/subdir.c348
1 files changed, 348 insertions, 0 deletions
diff --git a/fs/fdos/subdir.c b/fs/fdos/subdir.c
new file mode 100644
index 0000000000..5911f2e88f
--- /dev/null
+++ b/fs/fdos/subdir.c
@@ -0,0 +1,348 @@
+/*
+ * (C) Copyright 2002
+ * Stubli 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>
+#include <malloc.h>
+
+#if (CONFIG_COMMANDS & CFG_CMD_FDOS)
+
+#include "dos.h"
+#include "fdos.h"
+
+static int cache_sect;
+static unsigned char cache [SZ_STD_SECTOR];
+
+
+#define min(x,y) ((x)<(y)?(x):(y))
+
+static int descend (Slot_t *parent,
+ Fs_t *fs,
+ char *path);
+
+/*-----------------------------------------------------------------------------
+ * init_subdir --
+ *-----------------------------------------------------------------------------
+ */
+void init_subdir (void)
+{
+ cache_sect = -1;
+}
+/*-----------------------------------------------------------------------------
+ * basename --
+ *-----------------------------------------------------------------------------
+ */
+char *basename (char *name)
+{
+ register char *cptr;
+
+ if (!name || !*name) {
+ return ("");
+ }
+
+ for (cptr= name; *cptr++; );
+ while (--cptr >= name) {
+ if (*cptr == '/') {
+ return (cptr + 1);
+ }
+ }
+ return(name);
+}
+/*-----------------------------------------------------------------------------
+ * root_map --
+ *-----------------------------------------------------------------------------
+ */
+static int root_map (Fs_t *fs, Slot_t *file, int where, int *len)
+{
+ *len = min (*len, fs -> dir_len * SZ_STD_SECTOR - where);
+ if (*len < 0 ) {
+ *len = 0;
+ return (-1);
+ }
+ return fs -> dir_start * SZ_STD_SECTOR + where;
+}
+/*-----------------------------------------------------------------------------
+ * normal_map --
+ *-----------------------------------------------------------------------------
+ */
+static int normal_map (Fs_t *fs, Slot_t *file, int where, int *len)
+{
+ int offset;
+ int NrClu;
+ unsigned short RelCluNr;
+ unsigned short CurCluNr;
+ unsigned short NewCluNr;
+ unsigned short AbsCluNr;
+ int clus_size;
+
+ clus_size = fs -> cluster_size * SZ_STD_SECTOR;
+ offset = where % clus_size;
+
+ *len = min (*len, file -> FileSize - where);
+
+ if (*len < 0 ) {
+ *len = 0;
+ return (0);
+ }
+
+ if (file -> FirstAbsCluNr < 2){
+ *len = 0;
+ return (0);
+ }
+
+ RelCluNr = where / clus_size;
+
+ if (RelCluNr >= file -> PreviousRelCluNr){
+ CurCluNr = file -> PreviousRelCluNr;
+ AbsCluNr = file -> PreviousAbsCluNr;
+ } else {
+ CurCluNr = 0;
+ AbsCluNr = file -> FirstAbsCluNr;
+ }
+
+
+ NrClu = (offset + *len - 1) / clus_size;
+ while (CurCluNr <= RelCluNr + NrClu) {
+ if (CurCluNr == RelCluNr){
+ /* we have reached the beginning of our zone. Save
+ * coordinates */
+ file -> PreviousRelCluNr = RelCluNr;
+ file -> PreviousAbsCluNr = AbsCluNr;
+ }
+ NewCluNr = fat_decode (fs, AbsCluNr);
+ if (NewCluNr == 1 || NewCluNr == 0) {
+ PRINTF("Fat problem while decoding %d %x\n",
+ AbsCluNr, NewCluNr);
+ return (-1);
+ }
+ if (CurCluNr == RelCluNr + NrClu) {
+ break;
+ }
+
+ if (CurCluNr < RelCluNr && NewCluNr == FAT12_END) {
+ *len = 0;
+ return 0;
+ }
+
+ if (CurCluNr >= RelCluNr && NewCluNr != AbsCluNr + 1)
+ break;
+ CurCluNr++;
+ AbsCluNr = NewCluNr;
+ }
+
+ *len = min (*len, (1 + CurCluNr - RelCluNr) * clus_size - offset);
+
+ return (((file -> PreviousAbsCluNr - 2) * fs -> cluster_size +
+ fs -> dir_start + fs -> dir_len) *
+ SZ_STD_SECTOR + offset);
+}
+/*-----------------------------------------------------------------------------
+ * open_subdir -- open the subdir containing the file
+ *-----------------------------------------------------------------------------
+ */
+int open_subdir (File_t *desc)
+{
+ char *pathname;
+ char *tmp, *s, *path;
+ char terminator;
+
+ if ((pathname = (char *)malloc (MAX_PATH)) == NULL) {
+ return (-1);
+ }
+
+ strcpy (pathname, desc -> name);
+
+ /* Suppress file name */
+ tmp = basename (pathname);
+ *tmp = '\0';
+
+ /* root directory init */
+ desc -> subdir.FirstAbsCluNr = 0;
+ desc -> subdir.FileSize = -1;
+ desc -> subdir.map = root_map;
+ desc -> subdir.dir.attr = ATTR_DIRECTORY;
+
+ tmp = pathname;
+ for (s = tmp; ; ++s) {
+ if (*s == '/' || *s == '\0') {
+ path = tmp;
+ terminator = *s;
+ *s = '\0';
+ if (s != tmp && strcmp (path,".")) {
+ if (descend (&desc -> subdir, desc -> fs, path) < 0) {
+ free (pathname);
+ return (-1);
+ }
+ }
+ if (terminator == 0) {
+ break;
+ }
+ tmp = s + 1;
+ }
+ }
+ free (pathname);
+ return (0);
+}
+/*-----------------------------------------------------------------------------
+ * descend --
+ *-----------------------------------------------------------------------------
+ */
+static int descend (Slot_t *parent,
+ Fs_t *fs,
+ char *path)
+{
+ int entry;
+ Slot_t SubDir;
+
+ if(path[0] == '\0' || strcmp (path, ".") == 0) {
+ return (0);
+ }
+
+
+ entry = 0;
+ if (vfat_lookup (parent,
+ fs,
+ &(SubDir.dir),
+ &entry,
+ 0,
+ path,
+ ACCEPT_DIR | SINGLE | DO_OPEN,
+ 0,
+ &SubDir) == 0) {
+ *parent = SubDir;
+ return (0);
+ }
+
+ if (strcmp(path, "..") == 0) {
+ parent -> FileSize = -1;
+ parent -> FirstAbsCluNr = 0;
+ parent -> map = root_map;
+ return (0);
+ }
+ return (-1);
+}
+/*-----------------------------------------------------------------------------
+ * open_file --
+ *-----------------------------------------------------------------------------
+ */
+int open_file (Slot_t *file, Directory_t *dir)
+{
+ int first;
+ unsigned long size;
+
+ first = __le16_to_cpu (dir -> start);
+
+ if(first == 0 &&
+ (dir -> attr & ATTR_DIRECTORY) != 0) {
+ file -> FirstAbsCluNr = 0;
+ file -> FileSize = -1;
+ file -> map = root_map;
+ return (0);
+ }
+
+ if ((dir -> attr & ATTR_DIRECTORY) != 0) {
+ size = (1UL << 31) - 1;
+ }
+ else {
+ size = __le32_to_cpu (dir -> size);
+ }
+
+ file -> map = normal_map;
+ file -> FirstAbsCluNr = first;
+ file -> PreviousRelCluNr = 0xffff;
+ file -> FileSize = size;
+ return (0);
+}
+/*-----------------------------------------------------------------------------
+ * read_file --
+ *-----------------------------------------------------------------------------
+ */
+int read_file (Fs_t *fs,
+ Slot_t *file,
+ char *buf,
+ int where,
+ int len)
+{
+ int pos;
+ int read, nb, sect, offset;
+
+ pos = file -> map (fs, file, where, &len);
+ if (pos < 0) {
+ return -1;
+ }
+ if (len == 0) {
+ return (0);
+ }
+
+ /* Compute sector number */
+ sect = pos / SZ_STD_SECTOR;
+ offset = pos % SZ_STD_SECTOR;
+ read = 0;
+
+ if (offset) {
+ /* Read doesn't start at the sector beginning. We need to use our */
+ /* cache */
+ if (sect != cache_sect) {
+ if (dev_read (cache, sect, 1) < 0) {
+ return (-1);
+ }
+ cache_sect = sect;
+ }
+ nb = min (len, SZ_STD_SECTOR - offset);
+
+ memcpy (buf, cache + offset, nb);
+ read += nb;
+ len -= nb;
+ sect += 1;
+ }
+
+ if (len > SZ_STD_SECTOR) {
+ nb = (len - 1) / SZ_STD_SECTOR;
+ if (dev_read (buf + read, sect, nb) < 0) {
+ return ((read) ? read : -1);
+ }
+ /* update sector position */
+ sect += nb;
+
+ /* Update byte position */
+ nb *= SZ_STD_SECTOR;
+ read += nb;
+ len -= nb;
+ }
+
+ if (len) {
+ if (sect != cache_sect) {
+ if (dev_read (cache, sect, 1) < 0) {
+ return ((read) ? read : -1);
+ cache_sect = -1;
+ }
+ cache_sect = sect;
+ }
+
+ memcpy (buf + read, cache, len);
+ read += len;
+ }
+ return (read);
+}
+#endif
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