2 libparted - a library for manipulating disk partitions
3 Copyright (C) 2004, 2005 Free Software Foundation, Inc.
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
26 #include <parted/parted.h>
27 #include <parted/endian.h>
28 #include <parted/debug.h>
33 # define _(String) dgettext (PACKAGE, String)
35 # define _(String) (String)
36 #endif /* ENABLE_NLS */
43 /* Open the data fork of a file with its first three extents and its CNID */
45 hfs_file_open (PedFileSystem *fs, uint32_t CNID,
46 HfsExtDataRec ext_desc, PedSector sect_nb)
50 file = (HfsPrivateFile*) ped_malloc (sizeof (HfsPrivateFile));
51 if (!file) return NULL;
54 file->sect_nb = sect_nb;
56 memcpy(file->first, ext_desc, sizeof (HfsExtDataRec));
57 file->start_cache = 0;
62 /* Close an HFS file */
64 hfs_file_close (HfsPrivateFile* file)
69 /* warning : only works on data forks */
71 hfs_get_extent_containing (HfsPrivateFile* file, unsigned int block,
72 HfsExtDataRec cache, uint16_t* ptr_start_cache)
74 uint8_t record[sizeof (HfsExtentKey)
75 + sizeof (HfsExtDataRec)];
77 HfsExtentKey* ret_key = (HfsExtentKey*) record;
78 HfsExtDescriptor* ret_cache = (HfsExtDescriptor*)
79 (record + sizeof (HfsExtentKey));
80 HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
81 file->fs->type_specific;
83 search.key_length = sizeof (HfsExtentKey) - 1;
84 search.type = HFS_DATA_FORK;
85 search.file_ID = file->CNID;
86 search.start = PED_CPU_TO_BE16 (block);
88 if (!hfs_btree_search (priv_data->extent_file,
89 (HfsPrivateGenericKey*) &search,
90 record, sizeof (record), NULL))
93 if (ret_key->file_ID != search.file_ID || ret_key->type != search.type)
96 memcpy (cache, ret_cache, sizeof(HfsExtDataRec));
97 *ptr_start_cache = PED_BE16_TO_CPU (ret_key->start);
102 /* find and return the nth sector of a file */
103 /* return 0 on error */
105 hfs_file_find_sector (HfsPrivateFile* file, PedSector sector)
107 HfsPrivateFSData* priv_data = (HfsPrivateFSData*)
108 file->fs->type_specific;
109 unsigned int sect_by_block = PED_BE32_TO_CPU (
110 priv_data->mdb->block_size)
111 / PED_SECTOR_SIZE_DEFAULT;
112 unsigned int i, s, vol_block;
113 unsigned int block = sector / sect_by_block;
114 unsigned int offset = sector % sect_by_block;
116 /* in the three first extent */
117 for (s = 0, i = 0; i < HFS_EXT_NB; i++) {
118 if ((block >= s) && ( block < s + PED_BE16_TO_CPU (
119 file->first[i].block_count))) {
120 vol_block = (block - s) + PED_BE16_TO_CPU (
121 file->first[i].start_block);
124 s += PED_BE16_TO_CPU (file->first[i].block_count);
127 /* in the three cached extent */
128 if (file->start_cache && block >= file->start_cache)
129 for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
130 if ((block >= s) && (block < s + PED_BE16_TO_CPU (
131 file->cache[i].block_count))) {
132 vol_block = (block - s) + PED_BE16_TO_CPU (
133 file->cache[i].start_block);
136 s += PED_BE16_TO_CPU (file->cache[i].block_count);
140 if (!hfs_get_extent_containing (file, block, file->cache,
141 &(file->start_cache))) {
142 ped_exception_throw (
143 PED_EXCEPTION_WARNING,
144 PED_EXCEPTION_CANCEL,
145 _("Could not update the extent cache for HFS file with "
147 PED_BE32_TO_CPU(file->CNID));
151 /* in the three cached extent */
152 PED_ASSERT(file->start_cache && block >= file->start_cache, return 0);
153 for (s = file->start_cache, i = 0; i < HFS_EXT_NB; i++) {
154 if ((block >= s) && (block < s + PED_BE16_TO_CPU (
155 file->cache[i].block_count))) {
156 vol_block = (block - s) + PED_BE16_TO_CPU (
157 file->cache[i].start_block);
160 s += PED_BE16_TO_CPU (file->cache[i].block_count);
166 return (PedSector) PED_BE16_TO_CPU (priv_data->mdb->start_block)
167 + (PedSector) vol_block * sect_by_block
171 /* Read the nth sector of a file */
172 /* return 0 on error */
174 hfs_file_read_sector (HfsPrivateFile* file, void *buf, PedSector sector)
176 PedSector abs_sector;
178 if (sector >= file->sect_nb) {
179 ped_exception_throw (
181 PED_EXCEPTION_CANCEL,
182 _("Trying to read HFS file with CNID %X behind EOF."),
183 PED_BE32_TO_CPU(file->CNID));
187 abs_sector = hfs_file_find_sector (file, sector);
189 ped_exception_throw (
191 PED_EXCEPTION_CANCEL,
192 _("Could not find sector %lli of HFS file with "
194 sector, PED_BE32_TO_CPU(file->CNID));
198 return ped_geometry_read (file->fs->geom, buf, abs_sector, 1);
201 /* Write the nth sector of a file */
202 /* return 0 on error */
204 hfs_file_write_sector (HfsPrivateFile* file, void *buf, PedSector sector)
206 PedSector abs_sector;
208 if (sector >= file->sect_nb) {
209 ped_exception_throw (
211 PED_EXCEPTION_CANCEL,
212 _("Trying to write HFS file with CNID %X behind EOF."),
213 PED_BE32_TO_CPU(file->CNID));
217 abs_sector = hfs_file_find_sector (file, sector);
219 ped_exception_throw (
221 PED_EXCEPTION_CANCEL,
222 _("Could not find sector %lli of HFS file with "
224 sector, PED_BE32_TO_CPU(file->CNID));
228 return ped_geometry_write (file->fs->geom, buf, abs_sector, 1);
231 #endif /* !DISCOVER_ONLY */