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libparted - a library for manipulating disk partitions
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Copyright (C) 2004-2005, 2007, 2009-2012 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <parted/parted.h>
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#include <parted/endian.h>
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#include <parted/debug.h>
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# define _(String) dgettext (PACKAGE, String)
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# define _(String) (String)
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#endif /* ENABLE_NLS */
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/* Open the data fork of a file with its first three extents and its CNID */
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hfs_file_open (PedFileSystem *fs, uint32_t CNID,
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HfsExtDataRec ext_desc, PedSector sect_nb)
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file = (HfsPrivateFile*) ped_malloc (sizeof (HfsPrivateFile));
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if (!file) return NULL;
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file->sect_nb = sect_nb;
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memcpy(file->first, ext_desc, sizeof (HfsExtDataRec));
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file->start_cache = 0;
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/* Close an HFS file */
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hfs_file_close (HfsPrivateFile* file)
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/* warning : only works on data forks */
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hfs_get_extent_containing (HfsPrivateFile* file, unsigned int block,
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HfsExtDataRec cache, uint16_t* ptr_start_cache)
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uint8_t record[sizeof (HfsExtentKey)
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+ sizeof (HfsExtDataRec)];
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HfsExtentKey* ret_key = (HfsExtentKey*) record;
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HfsExtDescriptor* ret_cache = (HfsExtDescriptor*)
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(record + sizeof (HfsExtentKey));
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HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
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file->fs->type_specific;
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search.key_length = sizeof (HfsExtentKey) - 1;
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search.type = HFS_DATA_FORK;
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search.file_ID = file->CNID;
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search.start = PED_CPU_TO_BE16 (block);
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if (!hfs_btree_search (priv_data->extent_file,
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(HfsPrivateGenericKey*) &search,
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record, sizeof (record), NULL))
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if (ret_key->file_ID != search.file_ID || ret_key->type != search.type)
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memcpy (cache, ret_cache, sizeof(HfsExtDataRec));
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*ptr_start_cache = PED_BE16_TO_CPU (ret_key->start);
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/* find and return the nth sector of a file */
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/* return 0 on error */
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hfs_file_find_sector (HfsPrivateFile* file, PedSector sector)
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HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
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file->fs->type_specific;
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unsigned int sect_by_block = PED_BE32_TO_CPU (
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priv_data->mdb->block_size)
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/ PED_SECTOR_SIZE_DEFAULT;
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unsigned int i, s, vol_block;
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unsigned int block = sector / sect_by_block;
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unsigned int offset = sector % sect_by_block;
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/* in the three first extent */
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for (s = 0, i = 0; i < HFS_EXT_NB; i++) {
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if ((block >= s) && ( block < s + PED_BE16_TO_CPU (
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file->first[i].block_count))) {
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vol_block = (block - s) + PED_BE16_TO_CPU (
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file->first[i].start_block);
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s += PED_BE16_TO_CPU (file->first[i].block_count);
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/* in the three cached extent */
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if (file->start_cache && block >= file->start_cache)
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for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
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if ((block >= s) && (block < s + PED_BE16_TO_CPU (
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file->cache[i].block_count))) {
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vol_block = (block - s) + PED_BE16_TO_CPU (
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file->cache[i].start_block);
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s += PED_BE16_TO_CPU (file->cache[i].block_count);
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if (!hfs_get_extent_containing (file, block, file->cache,
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&(file->start_cache))) {
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ped_exception_throw (
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PED_EXCEPTION_WARNING,
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PED_EXCEPTION_CANCEL,
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_("Could not update the extent cache for HFS file with "
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PED_BE32_TO_CPU(file->CNID));
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/* in the three cached extent */
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PED_ASSERT(file->start_cache && block >= file->start_cache);
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for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
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if ((block >= s) && (block < s + PED_BE16_TO_CPU (
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file->cache[i].block_count))) {
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vol_block = (block - s) + PED_BE16_TO_CPU (
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file->cache[i].start_block);
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s += PED_BE16_TO_CPU (file->cache[i].block_count);
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return (PedSector) PED_BE16_TO_CPU (priv_data->mdb->start_block)
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+ (PedSector) vol_block * sect_by_block
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/* Read the nth sector of a file */
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/* return 0 on error */
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hfs_file_read_sector (HfsPrivateFile* file, void *buf, PedSector sector)
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PedSector abs_sector;
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if (sector >= file->sect_nb) {
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ped_exception_throw (
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PED_EXCEPTION_CANCEL,
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_("Trying to read HFS file with CNID %X behind EOF."),
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PED_BE32_TO_CPU(file->CNID));
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abs_sector = hfs_file_find_sector (file, sector);
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ped_exception_throw (
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PED_EXCEPTION_CANCEL,
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_("Could not find sector %lli of HFS file with "
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sector, PED_BE32_TO_CPU(file->CNID));
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return ped_geometry_read (file->fs->geom, buf, abs_sector, 1);
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/* Write the nth sector of a file */
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/* return 0 on error */
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hfs_file_write_sector (HfsPrivateFile* file, void *buf, PedSector sector)
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PedSector abs_sector;
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if (sector >= file->sect_nb) {
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ped_exception_throw (
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PED_EXCEPTION_CANCEL,
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_("Trying to write HFS file with CNID %X behind EOF."),
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PED_BE32_TO_CPU(file->CNID));
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abs_sector = hfs_file_find_sector (file, sector);
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ped_exception_throw (
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PED_EXCEPTION_CANCEL,
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_("Could not find sector %lli of HFS file with "
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sector, PED_BE32_TO_CPU(file->CNID));
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return ped_geometry_write (file->fs->geom, buf, abs_sector, 1);
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#endif /* !DISCOVER_ONLY */