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/*
libparted - a library for manipulating disk partitions
Copyright (C) 2004-2005, 2007, 2009-2014, 2019-2023 Free Software
Foundation, Inc.
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef DISCOVER_ONLY
#include <config.h>
#include <parted/parted.h>
#include <parted/endian.h>
#include <parted/debug.h>
#include <stdint.h>
#if ENABLE_NLS
# include <libintl.h>
# define _(String) dgettext (PACKAGE, String)
#else
# define _(String) (String)
#endif /* ENABLE_NLS */
#include "hfs.h"
#include "advfs.h"
#include "file.h"
/* Open the data fork of a file with its first three extents and its CNID */
HfsPrivateFile*
hfs_file_open (PedFileSystem *fs, uint32_t CNID,
HfsExtDataRec ext_desc, PedSector sect_nb)
{
HfsPrivateFile* file;
file = (HfsPrivateFile*) ped_malloc (sizeof (HfsPrivateFile));
if (!file) return NULL;
file->fs = fs;
file->sect_nb = sect_nb;
file->CNID = CNID;
memcpy(file->first, ext_desc, sizeof (HfsExtDataRec));
file->start_cache = 0;
return file;
}
/* Close an HFS file */
void
hfs_file_close (HfsPrivateFile* file)
{
free (file);
}
/* warning : only works on data forks */
static int
hfs_get_extent_containing (HfsPrivateFile* file, unsigned int block,
HfsExtDataRec cache, uint16_t* ptr_start_cache)
{
uint8_t record[sizeof (HfsExtentKey)
+ sizeof (HfsExtDataRec)];
HfsExtentKey search;
HfsExtentKey* ret_key = (HfsExtentKey*) record;
HfsExtDescriptor* ret_cache = (HfsExtDescriptor*)
(record + sizeof (HfsExtentKey));
HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
file->fs->type_specific;
search.key_length = sizeof (HfsExtentKey) - 1;
search.type = HFS_DATA_FORK;
search.file_ID = file->CNID;
search.start = PED_CPU_TO_BE16 (block);
if (!hfs_btree_search (priv_data->extent_file,
(HfsPrivateGenericKey*) &search,
record, sizeof (record), NULL))
return 0;
if (ret_key->file_ID != search.file_ID || ret_key->type != search.type)
return 0;
memcpy (cache, ret_cache, sizeof(HfsExtDataRec));
*ptr_start_cache = PED_BE16_TO_CPU (ret_key->start);
return 1;
}
/* find and return the nth sector of a file */
/* return 0 on error */
static PedSector
hfs_file_find_sector (HfsPrivateFile* file, PedSector sector)
{
HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
file->fs->type_specific;
unsigned int sect_by_block = PED_BE32_TO_CPU (
priv_data->mdb->block_size)
/ PED_SECTOR_SIZE_DEFAULT;
unsigned int i, s, vol_block;
unsigned int block = sector / sect_by_block;
unsigned int offset = sector % sect_by_block;
/* in the three first extent */
for (s = 0, i = 0; i < HFS_EXT_NB; i++) {
if ((block >= s) && ( block < s + PED_BE16_TO_CPU (
file->first[i].block_count))) {
vol_block = (block - s) + PED_BE16_TO_CPU (
file->first[i].start_block);
goto sector_found;
}
s += PED_BE16_TO_CPU (file->first[i].block_count);
}
/* in the three cached extent */
if (file->start_cache && block >= file->start_cache)
for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
if ((block >= s) && (block < s + PED_BE16_TO_CPU (
file->cache[i].block_count))) {
vol_block = (block - s) + PED_BE16_TO_CPU (
file->cache[i].start_block);
goto sector_found;
}
s += PED_BE16_TO_CPU (file->cache[i].block_count);
}
/* update cache */
if (!hfs_get_extent_containing (file, block, file->cache,
&(file->start_cache))) {
ped_exception_throw (
PED_EXCEPTION_WARNING,
PED_EXCEPTION_CANCEL,
_("Could not update the extent cache for HFS file with "
"CNID %X."),
PED_BE32_TO_CPU(file->CNID));
return 0;
}
/* in the three cached extent */
PED_ASSERT(file->start_cache && block >= file->start_cache);
for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
if ((block >= s) && (block < s + PED_BE16_TO_CPU (
file->cache[i].block_count))) {
vol_block = (block - s) + PED_BE16_TO_CPU (
file->cache[i].start_block);
goto sector_found;
}
s += PED_BE16_TO_CPU (file->cache[i].block_count);
}
return 0;
sector_found:
return (PedSector) PED_BE16_TO_CPU (priv_data->mdb->start_block)
+ (PedSector) vol_block * sect_by_block
+ offset;
}
/* Read the nth sector of a file */
/* return 0 on error */
int
hfs_file_read_sector (HfsPrivateFile* file, void *buf, PedSector sector)
{
PedSector abs_sector;
if (sector >= file->sect_nb) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
_("Trying to read HFS file with CNID %X behind EOF."),
PED_BE32_TO_CPU(file->CNID));
return 0;
}
abs_sector = hfs_file_find_sector (file, sector);
if (!abs_sector) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
_("Could not find sector %lli of HFS file with "
"CNID %X."),
sector, PED_BE32_TO_CPU(file->CNID));
return 0;
}
return ped_geometry_read (file->fs->geom, buf, abs_sector, 1);
}
/* Write the nth sector of a file */
/* return 0 on error */
int
hfs_file_write_sector (HfsPrivateFile* file, void *buf, PedSector sector)
{
PedSector abs_sector;
if (sector >= file->sect_nb) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
_("Trying to write HFS file with CNID %X behind EOF."),
PED_BE32_TO_CPU(file->CNID));
return 0;
}
abs_sector = hfs_file_find_sector (file, sector);
if (!abs_sector) {
ped_exception_throw (
PED_EXCEPTION_ERROR,
PED_EXCEPTION_CANCEL,
_("Could not find sector %lli of HFS file with "
"CNID %X."),
sector, PED_BE32_TO_CPU(file->CNID));
return 0;
}
return ped_geometry_write (file->fs->geom, buf, abs_sector, 1);
}
#endif /* !DISCOVER_ONLY */
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