0,0 → 1,204 |
/* |
* Copyright (c) 2008 Jakub Jermar |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* |
* - Redistributions of source code must retain the above copyright |
* notice, this list of conditions and the following disclaimer. |
* - Redistributions in binary form must reproduce the above copyright |
* notice, this list of conditions and the following disclaimer in the |
* documentation and/or other materials provided with the distribution. |
* - The name of the author may not be used to endorse or promote products |
* derived from this software without specific prior written permission. |
* |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
|
/** @addtogroup fs |
* @{ |
*/ |
|
/** |
* @file fat_dentry.c |
* @brief Functions that work with FAT directory entries. |
*/ |
|
#include "fat_dentry.h" |
#include <ctype.h> |
#include <string.h> |
|
static bool is_d_char(const char ch) |
{ |
if (isalnum(ch) || ch == '_') |
return true; |
else |
return false; |
} |
|
/** Compare path component with the name read from the dentry. |
* |
* This function compares the path component with the name read from the dentry. |
* The comparison is case insensitive and tolerates a mismatch on the trailing |
* dot character at the end of the name (i.e. when there is a dot, but no |
* extension). |
* |
* @param name Node name read from the dentry. |
* @param component Path component. |
* |
* @return Zero on match, non-zero otherwise. |
*/ |
int fat_dentry_namecmp(char *name, const char *component) |
{ |
int rc; |
if (!(rc = stricmp(name, component))) |
return rc; |
if (!strchr(name, '.')) { |
/* |
* There is no '.' in the name, so we know that there is enough |
* space for appending an extra '.' to name. |
*/ |
name[strlen(name)] = '.'; |
name[strlen(name) + 1] = '\0'; |
rc = stricmp(name, component); |
} |
return rc; |
} |
|
bool fat_dentry_name_verify(const char *name) |
{ |
unsigned i, dot; |
bool dot_found = false; |
|
|
for (i = 0; name[i]; i++) { |
if (name[i] == '.') { |
if (dot_found) { |
return false; |
} else { |
dot_found = true; |
dot = i; |
} |
} else { |
if (!is_d_char(name[i])) |
return false; |
} |
} |
|
if (dot_found) { |
if (dot > FAT_NAME_LEN) |
return false; |
if (i - dot > FAT_EXT_LEN + 1) |
return false; |
} else { |
if (i > FAT_NAME_LEN) |
return false; |
} |
|
return true; |
} |
|
void fat_dentry_name_get(const fat_dentry_t *d, char *buf) |
{ |
int i; |
|
for (i = 0; i < FAT_NAME_LEN; i++) { |
if (d->name[i] == FAT_PAD) |
break; |
if (d->name[i] == FAT_DENTRY_E5_ESC) |
*buf++ = 0xe5; |
else |
*buf++ = d->name[i]; |
} |
if (d->ext[0] != FAT_PAD) |
*buf++ = '.'; |
for (i = 0; i < FAT_EXT_LEN; i++) { |
if (d->ext[i] == FAT_PAD) { |
*buf = '\0'; |
return; |
} |
if (d->ext[i] == FAT_DENTRY_E5_ESC) |
*buf++ = 0xe5; |
else |
*buf++ = d->ext[i]; |
} |
*buf = '\0'; |
} |
|
void fat_dentry_name_set(fat_dentry_t *d, const char *name) |
{ |
int i; |
const char fake_ext[] = " "; |
|
|
for (i = 0; i < FAT_NAME_LEN; i++) { |
switch ((uint8_t) *name) { |
case 0xe5: |
d->name[i] = FAT_DENTRY_E5_ESC; |
name++; |
break; |
case '\0': |
case '.': |
d->name[i] = FAT_PAD; |
break; |
default: |
d->name[i] = toupper(*name++); |
break; |
} |
} |
if (*name++ != '.') |
name = fake_ext; |
for (i = 0; i < FAT_EXT_LEN; i++) { |
switch ((uint8_t) *name) { |
case 0xe5: |
d->ext[i] = FAT_DENTRY_E5_ESC; |
name++; |
break; |
case '\0': |
d->ext[i] = FAT_PAD; |
break; |
default: |
d->ext[i] = toupper(*name++); |
break; |
} |
} |
} |
|
fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *d) |
{ |
if (d->attr & FAT_ATTR_VOLLABEL) { |
/* volume label entry */ |
return FAT_DENTRY_SKIP; |
} |
if (d->name[0] == FAT_DENTRY_ERASED) { |
/* not-currently-used entry */ |
return FAT_DENTRY_FREE; |
} |
if (d->name[0] == FAT_DENTRY_UNUSED) { |
/* never used entry */ |
return FAT_DENTRY_LAST; |
} |
if (d->name[0] == FAT_DENTRY_DOT) { |
/* |
* Most likely '.' or '..'. |
* It cannot occur in a regular file name. |
*/ |
return FAT_DENTRY_SKIP; |
} |
return FAT_DENTRY_VALID; |
} |
|
/** |
* @} |
*/ |