summaryrefslogtreecommitdiff
path: root/fs/fdos/subdir.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/fdos/subdir.c')
-rw-r--r--fs/fdos/subdir.c329
1 files changed, 0 insertions, 329 deletions
diff --git a/fs/fdos/subdir.c b/fs/fdos/subdir.c
deleted file mode 100644
index 97f6fb7102..0000000000
--- a/fs/fdos/subdir.c
+++ /dev/null
@@ -1,329 +0,0 @@
-/*
- * (C) Copyright 2002
- * Stäubli Faverges - <www.staubli.com>
- * Pierre AUBERT p.aubert@staubli.com
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-#include <common.h>
-#include <config.h>
-#include <malloc.h>
-
-#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);
-}
generated by cgit (git 2.34.1) at 2025-01-13 18:01:55 +0000