| 1 |
1275 |
phoenix |
/*
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| 2 |
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* linux/fs/hfs/file_hdr.c
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| 3 |
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*
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* Copyright (C) 1995-1997 Paul H. Hargrove
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* This file may be distributed under the terms of the GNU General Public License.
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*
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| 7 |
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* This file contains the file_ops and inode_ops for the metadata
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* files under the AppleDouble and Netatalk representations.
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*
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* The source code distributions of Netatalk, versions 1.3.3b2 and
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* 1.4b2, were used as a specification of the location and format of
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* files used by Netatalk's afpd. No code from Netatalk appears in
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* hfs_fs. hfs_fs is not a work ``derived'' from Netatalk in the
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* sense of intellectual property law.
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*
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* "XXX" in a comment is a note to myself to consider changing something.
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*
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* In function preconditions the term "valid" applied to a pointer to
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* a structure means that the pointer is non-NULL and the structure it
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* points to has all fields initialized to consistent values.
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*
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| 22 |
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* XXX: Note the reason that there is not bmap() for AppleDouble
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| 23 |
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* header files is that dynamic nature of their structure make it
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* very difficult to safely mmap them. Maybe in the distant future
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* I'll get bored enough to implement it.
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*/
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#include "hfs.h"
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| 29 |
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#include <linux/hfs_fs_sb.h>
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#include <linux/hfs_fs_i.h>
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#include <linux/hfs_fs.h>
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| 33 |
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/* prodos types */
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#define PRODOSI_FTYPE_DIR 0x0F
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#define PRODOSI_FTYPE_TEXT 0x04
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#define PRODOSI_FTYPE_8BIT 0xFF
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| 37 |
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#define PRODOSI_FTYPE_16BIT 0xB3
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#define PRODOSI_AUXTYPE_DIR 0x0200
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/*================ Forward declarations ================*/
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static loff_t hdr_llseek(struct file *, loff_t, int);
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static hfs_rwret_t hdr_read(struct file *, char *, hfs_rwarg_t, loff_t *);
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static hfs_rwret_t hdr_write(struct file *, const char *,
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hfs_rwarg_t, loff_t *);
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/*================ Global variables ================*/
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| 48 |
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struct file_operations hfs_hdr_operations = {
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llseek: hdr_llseek,
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read: hdr_read,
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write: hdr_write,
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fsync: file_fsync,
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};
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struct inode_operations hfs_hdr_inode_operations = {
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setattr: hfs_notify_change_hdr,
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};
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| 59 |
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const struct hfs_hdr_layout hfs_dbl_fil_hdr_layout = {
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__constant_htonl(HFS_DBL_MAGIC), /* magic */
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__constant_htonl(HFS_HDR_VERSION_2), /* version */
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6, /* entries */
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{ /* descr[] */
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{HFS_HDR_FNAME, offsetof(struct hfs_dbl_hdr, real_name), ~0},
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| 65 |
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{HFS_HDR_DATES, offsetof(struct hfs_dbl_hdr, create_time), 16},
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{HFS_HDR_FINFO, offsetof(struct hfs_dbl_hdr, finderinfo), 32},
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{HFS_HDR_MACI, offsetof(struct hfs_dbl_hdr, fileinfo), 4},
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{HFS_HDR_DID, offsetof(struct hfs_dbl_hdr, cnid), 4},
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{HFS_HDR_RSRC, HFS_DBL_HDR_LEN, ~0}
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},
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{ /* order[] */
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[0],
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[1],
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[2],
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[3],
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[4],
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(struct hfs_hdr_descr *)&hfs_dbl_fil_hdr_layout.descr[5]
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}
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| 79 |
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};
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| 80 |
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| 81 |
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const struct hfs_hdr_layout hfs_dbl_dir_hdr_layout = {
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__constant_htonl(HFS_DBL_MAGIC), /* magic */
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| 83 |
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__constant_htonl(HFS_HDR_VERSION_2), /* version */
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| 84 |
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5, /* entries */
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| 85 |
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{ /* descr[] */
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| 86 |
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{HFS_HDR_FNAME, offsetof(struct hfs_dbl_hdr, real_name), ~0},
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| 87 |
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{HFS_HDR_DATES, offsetof(struct hfs_dbl_hdr, create_time), 16},
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| 88 |
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{HFS_HDR_FINFO, offsetof(struct hfs_dbl_hdr, finderinfo), 32},
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| 89 |
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{HFS_HDR_MACI, offsetof(struct hfs_dbl_hdr, fileinfo), 4},
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| 90 |
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{HFS_HDR_DID, offsetof(struct hfs_dbl_hdr, cnid), 4}
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},
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{ /* order[] */
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| 93 |
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(struct hfs_hdr_descr *)&hfs_dbl_dir_hdr_layout.descr[0],
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(struct hfs_hdr_descr *)&hfs_dbl_dir_hdr_layout.descr[1],
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(struct hfs_hdr_descr *)&hfs_dbl_dir_hdr_layout.descr[2],
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| 96 |
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(struct hfs_hdr_descr *)&hfs_dbl_dir_hdr_layout.descr[3],
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| 97 |
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(struct hfs_hdr_descr *)&hfs_dbl_dir_hdr_layout.descr[4]
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| 98 |
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}
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| 99 |
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};
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| 100 |
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| 101 |
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const struct hfs_hdr_layout hfs_nat2_hdr_layout = {
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| 102 |
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__constant_htonl(HFS_DBL_MAGIC), /* magic */
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| 103 |
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__constant_htonl(HFS_HDR_VERSION_2), /* version */
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| 104 |
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9, /* entries */
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| 105 |
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{ /* descr[] */
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| 106 |
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{HFS_HDR_FNAME, offsetof(struct hfs_dbl_hdr, real_name), ~0},
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| 107 |
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{HFS_HDR_COMNT, offsetof(struct hfs_dbl_hdr, comment), 0},
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| 108 |
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{HFS_HDR_DATES, offsetof(struct hfs_dbl_hdr, create_time), 16},
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| 109 |
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{HFS_HDR_FINFO, offsetof(struct hfs_dbl_hdr, finderinfo), 32},
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| 110 |
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{HFS_HDR_AFPI, offsetof(struct hfs_dbl_hdr, fileinfo), 4},
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| 111 |
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{HFS_HDR_DID, offsetof(struct hfs_dbl_hdr, cnid), 4},
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| 112 |
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{HFS_HDR_SNAME, offsetof(struct hfs_dbl_hdr, short_name), ~0},
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| 113 |
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{HFS_HDR_PRODOSI, offsetof(struct hfs_dbl_hdr, prodosi), 8},
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| 114 |
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{HFS_HDR_RSRC, HFS_NAT_HDR_LEN, ~0}
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| 115 |
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},
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| 116 |
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{ /* order[] */
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| 117 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[0],
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| 118 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[1],
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| 119 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[2],
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| 120 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[3],
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| 121 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[4],
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| 122 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[5],
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[6],
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[7],
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[8]
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| 126 |
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}
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| 127 |
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};
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| 128 |
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| 129 |
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const struct hfs_hdr_layout hfs_nat_hdr_layout = {
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| 130 |
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__constant_htonl(HFS_DBL_MAGIC), /* magic */
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| 131 |
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__constant_htonl(HFS_HDR_VERSION_1), /* version */
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| 132 |
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5, /* entries */
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| 133 |
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{ /* descr[] */
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| 134 |
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{HFS_HDR_FNAME, offsetof(struct hfs_dbl_hdr, real_name), ~0},
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| 135 |
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{HFS_HDR_COMNT, offsetof(struct hfs_dbl_hdr, comment), 0},
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| 136 |
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{HFS_HDR_OLDI, offsetof(struct hfs_dbl_hdr, create_time), 16},
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| 137 |
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{HFS_HDR_FINFO, offsetof(struct hfs_dbl_hdr, finderinfo), 32},
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| 138 |
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{HFS_HDR_RSRC, HFS_NAT_HDR_LEN, ~0},
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| 139 |
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},
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| 140 |
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{ /* order[] */
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| 141 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[0],
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| 142 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[1],
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| 143 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[2],
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| 144 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[3],
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| 145 |
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(struct hfs_hdr_descr *)&hfs_nat_hdr_layout.descr[4]
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| 146 |
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}
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| 147 |
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};
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| 148 |
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| 149 |
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/*================ File-local variables ================*/
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| 150 |
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| 151 |
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static const char fstype[16] =
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| 152 |
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{'M','a','c','i','n','t','o','s','h',' ',' ',' ',' ',' ',' ',' '};
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| 153 |
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| 154 |
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/*================ File-local data types ================*/
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| 155 |
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| 156 |
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struct hdr_hdr {
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| 157 |
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hfs_lword_t magic;
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| 158 |
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hfs_lword_t version;
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| 159 |
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hfs_byte_t filler[16];
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| 160 |
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hfs_word_t entries;
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| 161 |
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hfs_byte_t descrs[12*HFS_HDR_MAX];
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| 162 |
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} __attribute__((packed));
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| 163 |
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| 164 |
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/*================ File-local functions ================*/
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| 165 |
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| 166 |
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/*
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| 167 |
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* dlength()
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| 168 |
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*/
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| 169 |
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static int dlength(const struct hfs_hdr_descr *descr,
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| 170 |
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const struct hfs_cat_entry *entry)
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| 171 |
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{
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| 172 |
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hfs_u32 length = descr->length;
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| 173 |
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| 174 |
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/* handle auto-sized entries */
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| 175 |
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if (length == ~0) {
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| 176 |
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switch (descr->id) {
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| 177 |
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case HFS_HDR_DATA:
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| 178 |
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if (entry->type == HFS_CDR_FIL) {
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| 179 |
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length = entry->u.file.data_fork.lsize;
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| 180 |
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} else {
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| 181 |
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length = 0;
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| 182 |
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}
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| 183 |
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break;
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| 184 |
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| 185 |
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case HFS_HDR_RSRC:
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| 186 |
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if (entry->type == HFS_CDR_FIL) {
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| 187 |
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length = entry->u.file.rsrc_fork.lsize;
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| 188 |
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} else {
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| 189 |
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length = 0;
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| 190 |
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}
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| 191 |
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break;
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| 192 |
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| 193 |
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case HFS_HDR_FNAME:
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| 194 |
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length = entry->key.CName.Len;
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| 195 |
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break;
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| 196 |
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| 197 |
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case HFS_HDR_SNAME:
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| 198 |
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default:
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| 199 |
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length = 0;
|
| 200 |
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}
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| 201 |
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}
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| 202 |
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return length;
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| 203 |
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}
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| 204 |
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| 205 |
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/*
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| 206 |
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* hdr_build_meta()
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| 207 |
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*/
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| 208 |
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static void hdr_build_meta(struct hdr_hdr *meta,
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| 209 |
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const struct hfs_hdr_layout *layout,
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| 210 |
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const struct hfs_cat_entry *entry)
|
| 211 |
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{
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| 212 |
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const struct hfs_hdr_descr *descr;
|
| 213 |
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hfs_byte_t *ptr;
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| 214 |
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int lcv;
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| 215 |
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| 216 |
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hfs_put_nl(layout->magic, meta->magic);
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| 217 |
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hfs_put_nl(layout->version, meta->version);
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| 218 |
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if (layout->version == htonl(HFS_HDR_VERSION_1)) {
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| 219 |
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memcpy(meta->filler, fstype, 16);
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| 220 |
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} else {
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| 221 |
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memset(meta->filler, 0, 16);
|
| 222 |
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}
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| 223 |
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hfs_put_hs(layout->entries, meta->entries);
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| 224 |
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memset(meta->descrs, 0, sizeof(meta->descrs));
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| 225 |
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for (lcv = 0, descr = layout->descr, ptr = meta->descrs;
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| 226 |
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lcv < layout->entries; ++lcv, ++descr, ptr += 12) {
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| 227 |
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hfs_put_hl(descr->id, ptr);
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| 228 |
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hfs_put_hl(descr->offset, ptr + 4);
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| 229 |
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hfs_put_hl(dlength(descr, entry), ptr + 8);
|
| 230 |
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}
|
| 231 |
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}
|
| 232 |
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|
|
| 233 |
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/*
|
| 234 |
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* dup_layout ()
|
| 235 |
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*/
|
| 236 |
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static struct hfs_hdr_layout *dup_layout(const struct hfs_hdr_layout *old)
|
| 237 |
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{
|
| 238 |
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struct hfs_hdr_layout *new;
|
| 239 |
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int lcv;
|
| 240 |
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|
| 241 |
|
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if (HFS_NEW(new)) {
|
| 242 |
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memcpy(new, old, sizeof(*new));
|
| 243 |
|
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for (lcv = 0; lcv < new->entries; ++lcv) {
|
| 244 |
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(char *)(new->order[lcv]) += (char *)new - (char *)old;
|
| 245 |
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}
|
| 246 |
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}
|
| 247 |
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return new;
|
| 248 |
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}
|
| 249 |
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|
| 250 |
|
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/*
|
| 251 |
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* init_layout()
|
| 252 |
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*/
|
| 253 |
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static inline void init_layout(struct hfs_hdr_layout *layout,
|
| 254 |
|
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const hfs_byte_t *descrs)
|
| 255 |
|
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{
|
| 256 |
|
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struct hfs_hdr_descr **base, **p, **q, *tmp;
|
| 257 |
|
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int lcv, entries = layout->entries;
|
| 258 |
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|
|
| 259 |
|
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for (lcv = 0; lcv < entries; ++lcv, descrs += 12) {
|
| 260 |
|
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layout->order[lcv] = &layout->descr[lcv];
|
| 261 |
|
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layout->descr[lcv].id = hfs_get_hl(descrs);
|
| 262 |
|
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layout->descr[lcv].offset = hfs_get_hl(descrs + 4);
|
| 263 |
|
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layout->descr[lcv].length = hfs_get_hl(descrs + 8);
|
| 264 |
|
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}
|
| 265 |
|
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for (lcv = layout->entries; lcv < HFS_HDR_MAX; ++lcv) {
|
| 266 |
|
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layout->order[lcv] = NULL;
|
| 267 |
|
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layout->descr[lcv].id = 0;
|
| 268 |
|
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layout->descr[lcv].offset = 0;
|
| 269 |
|
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layout->descr[lcv].length = 0;
|
| 270 |
|
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}
|
| 271 |
|
|
|
| 272 |
|
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/* Sort the 'order' array using an insertion sort */
|
| 273 |
|
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base = &layout->order[0];
|
| 274 |
|
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for (p = (base+1); p < (base+entries); ++p) {
|
| 275 |
|
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q=p;
|
| 276 |
|
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while ((*q)->offset < (*(q-1))->offset) {
|
| 277 |
|
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tmp = *q;
|
| 278 |
|
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*q = *(q-1);
|
| 279 |
|
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*(--q) = tmp;
|
| 280 |
|
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if (q == base) break;
|
| 281 |
|
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}
|
| 282 |
|
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}
|
| 283 |
|
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}
|
| 284 |
|
|
|
| 285 |
|
|
/*
|
| 286 |
|
|
* adjust_forks()
|
| 287 |
|
|
*/
|
| 288 |
|
|
static inline void adjust_forks(struct hfs_cat_entry *entry,
|
| 289 |
|
|
const struct hfs_hdr_layout *layout)
|
| 290 |
|
|
{
|
| 291 |
|
|
int lcv;
|
| 292 |
|
|
|
| 293 |
|
|
for (lcv = 0; lcv < layout->entries; ++lcv) {
|
| 294 |
|
|
const struct hfs_hdr_descr *descr = &layout->descr[lcv];
|
| 295 |
|
|
|
| 296 |
|
|
if ((descr->id == HFS_HDR_DATA) &&
|
| 297 |
|
|
(descr->length != entry->u.file.data_fork.lsize)) {
|
| 298 |
|
|
entry->u.file.data_fork.lsize = descr->length;
|
| 299 |
|
|
hfs_extent_adj(&entry->u.file.data_fork);
|
| 300 |
|
|
} else if ((descr->id == HFS_HDR_RSRC) &&
|
| 301 |
|
|
(descr->length != entry->u.file.rsrc_fork.lsize)) {
|
| 302 |
|
|
entry->u.file.rsrc_fork.lsize = descr->length;
|
| 303 |
|
|
hfs_extent_adj(&entry->u.file.rsrc_fork);
|
| 304 |
|
|
}
|
| 305 |
|
|
}
|
| 306 |
|
|
}
|
| 307 |
|
|
|
| 308 |
|
|
/*
|
| 309 |
|
|
* get_dates()
|
| 310 |
|
|
*/
|
| 311 |
|
|
static void get_dates(const struct hfs_cat_entry *entry,
|
| 312 |
|
|
const struct inode *inode, hfs_u32 dates[3])
|
| 313 |
|
|
{
|
| 314 |
|
|
dates[0] = hfs_m_to_htime(entry->create_date);
|
| 315 |
|
|
dates[1] = hfs_m_to_htime(entry->modify_date);
|
| 316 |
|
|
dates[2] = hfs_m_to_htime(entry->backup_date);
|
| 317 |
|
|
}
|
| 318 |
|
|
|
| 319 |
|
|
/*
|
| 320 |
|
|
* set_dates()
|
| 321 |
|
|
*/
|
| 322 |
|
|
static void set_dates(struct hfs_cat_entry *entry, struct inode *inode,
|
| 323 |
|
|
const hfs_u32 *dates)
|
| 324 |
|
|
{
|
| 325 |
|
|
hfs_u32 tmp;
|
| 326 |
|
|
|
| 327 |
|
|
tmp = hfs_h_to_mtime(dates[0]);
|
| 328 |
|
|
if (entry->create_date != tmp) {
|
| 329 |
|
|
entry->create_date = tmp;
|
| 330 |
|
|
hfs_cat_mark_dirty(entry);
|
| 331 |
|
|
}
|
| 332 |
|
|
tmp = hfs_h_to_mtime(dates[1]);
|
| 333 |
|
|
if (entry->modify_date != tmp) {
|
| 334 |
|
|
entry->modify_date = tmp;
|
| 335 |
|
|
inode->i_ctime = inode->i_atime = inode->i_mtime =
|
| 336 |
|
|
hfs_h_to_utime(dates[1]);
|
| 337 |
|
|
hfs_cat_mark_dirty(entry);
|
| 338 |
|
|
}
|
| 339 |
|
|
tmp = hfs_h_to_mtime(dates[2]);
|
| 340 |
|
|
if (entry->backup_date != tmp) {
|
| 341 |
|
|
entry->backup_date = tmp;
|
| 342 |
|
|
hfs_cat_mark_dirty(entry);
|
| 343 |
|
|
}
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
loff_t hdr_llseek(struct file *file, loff_t offset, int origin)
|
| 347 |
|
|
{
|
| 348 |
|
|
long long retval;
|
| 349 |
|
|
|
| 350 |
|
|
switch (origin) {
|
| 351 |
|
|
case 2:
|
| 352 |
|
|
offset += file->f_dentry->d_inode->i_size;
|
| 353 |
|
|
break;
|
| 354 |
|
|
case 1:
|
| 355 |
|
|
offset += file->f_pos;
|
| 356 |
|
|
}
|
| 357 |
|
|
retval = -EINVAL;
|
| 358 |
|
|
if (offset>=0 && offset<file->f_dentry->d_inode->i_size) {
|
| 359 |
|
|
if (offset != file->f_pos) {
|
| 360 |
|
|
file->f_pos = offset;
|
| 361 |
|
|
file->f_reada = 0;
|
| 362 |
|
|
file->f_version = ++event;
|
| 363 |
|
|
}
|
| 364 |
|
|
retval = offset;
|
| 365 |
|
|
}
|
| 366 |
|
|
return retval;
|
| 367 |
|
|
}
|
| 368 |
|
|
|
| 369 |
|
|
/*
|
| 370 |
|
|
* hdr_read()
|
| 371 |
|
|
*
|
| 372 |
|
|
* This is the read field in the inode_operations structure for
|
| 373 |
|
|
* header files. The purpose is to transfer up to 'count' bytes
|
| 374 |
|
|
* from the file corresponding to 'inode', beginning at
|
| 375 |
|
|
* 'filp->offset' bytes into the file. The data is transferred to
|
| 376 |
|
|
* user-space at the address 'buf'. Returns the number of bytes
|
| 377 |
|
|
* successfully transferred.
|
| 378 |
|
|
*/
|
| 379 |
|
|
/* XXX: what about the entry count changing on us? */
|
| 380 |
|
|
static hfs_rwret_t hdr_read(struct file * filp, char * buf,
|
| 381 |
|
|
hfs_rwarg_t count, loff_t *ppos)
|
| 382 |
|
|
{
|
| 383 |
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
| 384 |
|
|
struct hfs_cat_entry *entry = HFS_I(inode)->entry;
|
| 385 |
|
|
const struct hfs_hdr_layout *layout;
|
| 386 |
|
|
off_t start, length, offset;
|
| 387 |
|
|
off_t pos = *ppos;
|
| 388 |
|
|
int left, lcv, read = 0;
|
| 389 |
|
|
|
| 390 |
|
|
if (!S_ISREG(inode->i_mode)) {
|
| 391 |
|
|
hfs_warn("hfs_hdr_read: mode = %07o\n",inode->i_mode);
|
| 392 |
|
|
return -EINVAL;
|
| 393 |
|
|
}
|
| 394 |
|
|
|
| 395 |
|
|
if (HFS_I(inode)->layout) {
|
| 396 |
|
|
layout = HFS_I(inode)->layout;
|
| 397 |
|
|
} else {
|
| 398 |
|
|
layout = HFS_I(inode)->default_layout;
|
| 399 |
|
|
}
|
| 400 |
|
|
|
| 401 |
|
|
/* Adjust count to fit within the bounds of the file */
|
| 402 |
|
|
if ((pos >= inode->i_size) || (count <= 0)) {
|
| 403 |
|
|
return 0;
|
| 404 |
|
|
} else if (count > inode->i_size - pos) {
|
| 405 |
|
|
count = inode->i_size - pos;
|
| 406 |
|
|
}
|
| 407 |
|
|
|
| 408 |
|
|
/* Handle the fixed-location portion */
|
| 409 |
|
|
length = sizeof(hfs_u32) + sizeof(hfs_u32) + 16 +
|
| 410 |
|
|
sizeof(hfs_u16) + layout->entries * (3 * sizeof(hfs_u32));
|
| 411 |
|
|
if (pos < length) {
|
| 412 |
|
|
struct hdr_hdr meta;
|
| 413 |
|
|
|
| 414 |
|
|
left = length - pos;
|
| 415 |
|
|
if (left > count) {
|
| 416 |
|
|
left = count;
|
| 417 |
|
|
}
|
| 418 |
|
|
|
| 419 |
|
|
hdr_build_meta(&meta, layout, entry);
|
| 420 |
|
|
left -= copy_to_user(buf, ((char *)&meta) + pos, left);
|
| 421 |
|
|
count -= left;
|
| 422 |
|
|
read += left;
|
| 423 |
|
|
pos += left;
|
| 424 |
|
|
buf += left;
|
| 425 |
|
|
}
|
| 426 |
|
|
if (!count) {
|
| 427 |
|
|
goto done;
|
| 428 |
|
|
}
|
| 429 |
|
|
|
| 430 |
|
|
/* Handle the actual data */
|
| 431 |
|
|
for (lcv = 0; count && (lcv < layout->entries); ++lcv) {
|
| 432 |
|
|
const struct hfs_hdr_descr *descr = layout->order[lcv];
|
| 433 |
|
|
struct hfs_fork *fork;
|
| 434 |
|
|
char tmp[16], *p;
|
| 435 |
|
|
off_t limit;
|
| 436 |
|
|
|
| 437 |
|
|
/* stop reading if we run out of descriptors early */
|
| 438 |
|
|
if (!descr) {
|
| 439 |
|
|
break;
|
| 440 |
|
|
}
|
| 441 |
|
|
|
| 442 |
|
|
/* find start and length of this entry */
|
| 443 |
|
|
start = descr->offset;
|
| 444 |
|
|
length = dlength(descr, entry);
|
| 445 |
|
|
|
| 446 |
|
|
/* Skip to next entry if this one is empty or isn't needed */
|
| 447 |
|
|
if (!length || (pos >= start + length)) {
|
| 448 |
|
|
continue;
|
| 449 |
|
|
}
|
| 450 |
|
|
|
| 451 |
|
|
/* Pad with zeros to the start of this entry if needed */
|
| 452 |
|
|
if (pos < start) {
|
| 453 |
|
|
left = start - pos;
|
| 454 |
|
|
if (left > count) {
|
| 455 |
|
|
left = count;
|
| 456 |
|
|
}
|
| 457 |
|
|
clear_user(buf, left);
|
| 458 |
|
|
count -= left;
|
| 459 |
|
|
read += left;
|
| 460 |
|
|
pos += left;
|
| 461 |
|
|
buf += left;
|
| 462 |
|
|
}
|
| 463 |
|
|
if (!count) {
|
| 464 |
|
|
goto done;
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
/* locate and/or construct the data for this entry */
|
| 468 |
|
|
fork = NULL;
|
| 469 |
|
|
p = NULL;
|
| 470 |
|
|
switch (descr->id) {
|
| 471 |
|
|
case HFS_HDR_DATA:
|
| 472 |
|
|
fork = &entry->u.file.data_fork;
|
| 473 |
|
|
limit = fork->lsize;
|
| 474 |
|
|
break;
|
| 475 |
|
|
|
| 476 |
|
|
case HFS_HDR_RSRC:
|
| 477 |
|
|
fork = &entry->u.file.rsrc_fork;
|
| 478 |
|
|
limit = fork->lsize;
|
| 479 |
|
|
break;
|
| 480 |
|
|
|
| 481 |
|
|
case HFS_HDR_FNAME:
|
| 482 |
|
|
p = entry->key.CName.Name;
|
| 483 |
|
|
limit = entry->key.CName.Len;
|
| 484 |
|
|
break;
|
| 485 |
|
|
|
| 486 |
|
|
case HFS_HDR_OLDI:
|
| 487 |
|
|
case HFS_HDR_DATES:
|
| 488 |
|
|
get_dates(entry, inode, (hfs_u32 *)tmp);
|
| 489 |
|
|
if (descr->id == HFS_HDR_DATES) {
|
| 490 |
|
|
/* XXX: access date. hfsplus actually
|
| 491 |
|
|
has this. */
|
| 492 |
|
|
memcpy(tmp + 12, tmp + 4, 4);
|
| 493 |
|
|
} else if ((entry->type == HFS_CDR_FIL) &&
|
| 494 |
|
|
(entry->u.file.flags & HFS_FIL_LOCK)) {
|
| 495 |
|
|
hfs_put_hl(HFS_AFP_RDONLY, tmp + 12);
|
| 496 |
|
|
} else {
|
| 497 |
|
|
hfs_put_nl(0, tmp + 12);
|
| 498 |
|
|
}
|
| 499 |
|
|
p = tmp;
|
| 500 |
|
|
limit = 16;
|
| 501 |
|
|
break;
|
| 502 |
|
|
|
| 503 |
|
|
case HFS_HDR_FINFO:
|
| 504 |
|
|
p = (char *)&entry->info;
|
| 505 |
|
|
limit = 32;
|
| 506 |
|
|
break;
|
| 507 |
|
|
|
| 508 |
|
|
case HFS_HDR_AFPI:
|
| 509 |
|
|
/* XXX: this needs to do more mac->afp mappings */
|
| 510 |
|
|
hfs_put_ns(0, tmp);
|
| 511 |
|
|
if ((entry->type == HFS_CDR_FIL) &&
|
| 512 |
|
|
(entry->u.file.flags & HFS_FIL_LOCK)) {
|
| 513 |
|
|
hfs_put_hs(HFS_AFP_RDONLY, tmp + 2);
|
| 514 |
|
|
} else {
|
| 515 |
|
|
hfs_put_ns(0, tmp + 2);
|
| 516 |
|
|
}
|
| 517 |
|
|
p = tmp;
|
| 518 |
|
|
limit = 4;
|
| 519 |
|
|
break;
|
| 520 |
|
|
|
| 521 |
|
|
case HFS_HDR_PRODOSI:
|
| 522 |
|
|
/* XXX: this needs to do mac->prodos translations */
|
| 523 |
|
|
memset(tmp, 0, 8);
|
| 524 |
|
|
#if 0
|
| 525 |
|
|
hfs_put_ns(0, tmp); /* access */
|
| 526 |
|
|
hfs_put_ns(0, tmp); /* type */
|
| 527 |
|
|
hfs_put_nl(0, tmp); /* aux type */
|
| 528 |
|
|
#endif
|
| 529 |
|
|
p = tmp;
|
| 530 |
|
|
limit = 8;
|
| 531 |
|
|
break;
|
| 532 |
|
|
|
| 533 |
|
|
case HFS_HDR_MACI:
|
| 534 |
|
|
hfs_put_ns(0, tmp);
|
| 535 |
|
|
if (entry->type == HFS_CDR_FIL) {
|
| 536 |
|
|
hfs_put_hs(entry->u.file.flags, tmp + 2);
|
| 537 |
|
|
} else {
|
| 538 |
|
|
hfs_put_ns(entry->u.dir.flags, tmp + 2);
|
| 539 |
|
|
}
|
| 540 |
|
|
p = tmp;
|
| 541 |
|
|
limit = 4;
|
| 542 |
|
|
break;
|
| 543 |
|
|
|
| 544 |
|
|
case HFS_HDR_DID:
|
| 545 |
|
|
/* if it's rootinfo, stick the next available did in
|
| 546 |
|
|
* the did slot. */
|
| 547 |
|
|
limit = 4;
|
| 548 |
|
|
if (entry->cnid == htonl(HFS_ROOT_CNID)) {
|
| 549 |
|
|
struct hfs_mdb *mdb = entry->mdb;
|
| 550 |
|
|
const struct hfs_name *reserved =
|
| 551 |
|
|
HFS_SB(mdb->sys_mdb)->s_reserved2;
|
| 552 |
|
|
|
| 553 |
|
|
while (reserved->Len) {
|
| 554 |
|
|
if (hfs_streq(reserved->Name,
|
| 555 |
|
|
reserved->Len,
|
| 556 |
|
|
entry->key.CName.Name,
|
| 557 |
|
|
entry->key.CName.Len)) {
|
| 558 |
|
|
hfs_put_hl(mdb->next_id, tmp);
|
| 559 |
|
|
p = tmp;
|
| 560 |
|
|
goto hfs_did_done;
|
| 561 |
|
|
}
|
| 562 |
|
|
reserved++;
|
| 563 |
|
|
}
|
| 564 |
|
|
}
|
| 565 |
|
|
p = (char *) &entry->cnid;
|
| 566 |
|
|
hfs_did_done:
|
| 567 |
|
|
break;
|
| 568 |
|
|
|
| 569 |
|
|
case HFS_HDR_SNAME:
|
| 570 |
|
|
default:
|
| 571 |
|
|
limit = 0;
|
| 572 |
|
|
}
|
| 573 |
|
|
|
| 574 |
|
|
/* limit the transfer to the available data
|
| 575 |
|
|
of to the stated length of the entry. */
|
| 576 |
|
|
if (length > limit) {
|
| 577 |
|
|
length = limit;
|
| 578 |
|
|
}
|
| 579 |
|
|
offset = pos - start;
|
| 580 |
|
|
left = length - offset;
|
| 581 |
|
|
if (left > count) {
|
| 582 |
|
|
left = count;
|
| 583 |
|
|
}
|
| 584 |
|
|
if (left <= 0) {
|
| 585 |
|
|
continue;
|
| 586 |
|
|
}
|
| 587 |
|
|
|
| 588 |
|
|
/* transfer the data */
|
| 589 |
|
|
if (p) {
|
| 590 |
|
|
left -= copy_to_user(buf, p + offset, left);
|
| 591 |
|
|
} else if (fork) {
|
| 592 |
|
|
left = hfs_do_read(inode, fork, offset, buf, left,
|
| 593 |
|
|
filp->f_reada != 0);
|
| 594 |
|
|
if (left > 0) {
|
| 595 |
|
|
filp->f_reada = 1;
|
| 596 |
|
|
} else if (!read) {
|
| 597 |
|
|
return left;
|
| 598 |
|
|
} else {
|
| 599 |
|
|
goto done;
|
| 600 |
|
|
}
|
| 601 |
|
|
}
|
| 602 |
|
|
count -= left;
|
| 603 |
|
|
read += left;
|
| 604 |
|
|
pos += left;
|
| 605 |
|
|
buf += left;
|
| 606 |
|
|
}
|
| 607 |
|
|
|
| 608 |
|
|
/* Pad the file out with zeros */
|
| 609 |
|
|
if (count) {
|
| 610 |
|
|
clear_user(buf, count);
|
| 611 |
|
|
read += count;
|
| 612 |
|
|
pos += count;
|
| 613 |
|
|
}
|
| 614 |
|
|
|
| 615 |
|
|
done:
|
| 616 |
|
|
if (read) {
|
| 617 |
|
|
inode->i_atime = CURRENT_TIME;
|
| 618 |
|
|
*ppos = pos;
|
| 619 |
|
|
mark_inode_dirty(inode);
|
| 620 |
|
|
}
|
| 621 |
|
|
return read;
|
| 622 |
|
|
}
|
| 623 |
|
|
|
| 624 |
|
|
/*
|
| 625 |
|
|
* hdr_write()
|
| 626 |
|
|
*
|
| 627 |
|
|
* This is the write() entry in the file_operations structure for
|
| 628 |
|
|
* header files. The purpose is to transfer up to 'count' bytes
|
| 629 |
|
|
* to the file corresponding to 'inode' beginning at offset
|
| 630 |
|
|
* '*ppos' from user-space at the address 'buf'.
|
| 631 |
|
|
* The return value is the number of bytes actually transferred.
|
| 632 |
|
|
*/
|
| 633 |
|
|
static hfs_rwret_t hdr_write(struct file *filp, const char *buf,
|
| 634 |
|
|
hfs_rwarg_t count, loff_t *ppos)
|
| 635 |
|
|
{
|
| 636 |
|
|
struct inode *inode = filp->f_dentry->d_inode;
|
| 637 |
|
|
struct hfs_cat_entry *entry = HFS_I(inode)->entry;
|
| 638 |
|
|
struct hfs_hdr_layout *layout;
|
| 639 |
|
|
off_t start, length, offset;
|
| 640 |
|
|
int left, lcv, written = 0;
|
| 641 |
|
|
struct hdr_hdr meta;
|
| 642 |
|
|
int built_meta = 0;
|
| 643 |
|
|
off_t pos;
|
| 644 |
|
|
|
| 645 |
|
|
if (!S_ISREG(inode->i_mode)) {
|
| 646 |
|
|
hfs_warn("hfs_hdr_write: mode = %07o\n", inode->i_mode);
|
| 647 |
|
|
return -EINVAL;
|
| 648 |
|
|
}
|
| 649 |
|
|
if (count <= 0) {
|
| 650 |
|
|
return 0;
|
| 651 |
|
|
}
|
| 652 |
|
|
|
| 653 |
|
|
pos = (filp->f_flags & O_APPEND) ? inode->i_size : *ppos;
|
| 654 |
|
|
|
| 655 |
|
|
if (!HFS_I(inode)->layout) {
|
| 656 |
|
|
HFS_I(inode)->layout = dup_layout(HFS_I(inode)->default_layout);
|
| 657 |
|
|
}
|
| 658 |
|
|
layout = HFS_I(inode)->layout;
|
| 659 |
|
|
|
| 660 |
|
|
/* Handle the 'magic', 'version', 'filler' and 'entries' fields */
|
| 661 |
|
|
length = sizeof(hfs_u32) + sizeof(hfs_u32) + 16 + sizeof(hfs_u16);
|
| 662 |
|
|
if (pos < length) {
|
| 663 |
|
|
hdr_build_meta(&meta, layout, entry);
|
| 664 |
|
|
built_meta = 1;
|
| 665 |
|
|
|
| 666 |
|
|
left = length - pos;
|
| 667 |
|
|
if (left > count) {
|
| 668 |
|
|
left = count;
|
| 669 |
|
|
}
|
| 670 |
|
|
|
| 671 |
|
|
left -= copy_from_user(((char *)&meta) + pos, buf, left);
|
| 672 |
|
|
layout->magic = hfs_get_nl(meta.magic);
|
| 673 |
|
|
layout->version = hfs_get_nl(meta.version);
|
| 674 |
|
|
layout->entries = hfs_get_hs(meta.entries);
|
| 675 |
|
|
if (layout->entries > HFS_HDR_MAX) {
|
| 676 |
|
|
/* XXX: should allocate slots dynamically */
|
| 677 |
|
|
hfs_warn("hfs_hdr_write: TRUNCATING TO %d "
|
| 678 |
|
|
"DESCRIPTORS\n", HFS_HDR_MAX);
|
| 679 |
|
|
layout->entries = HFS_HDR_MAX;
|
| 680 |
|
|
}
|
| 681 |
|
|
|
| 682 |
|
|
count -= left;
|
| 683 |
|
|
written += left;
|
| 684 |
|
|
pos += left;
|
| 685 |
|
|
buf += left;
|
| 686 |
|
|
}
|
| 687 |
|
|
if (!count) {
|
| 688 |
|
|
goto done;
|
| 689 |
|
|
}
|
| 690 |
|
|
|
| 691 |
|
|
/* We know for certain how many entries we have, so process them */
|
| 692 |
|
|
length += layout->entries * 3 * sizeof(hfs_u32);
|
| 693 |
|
|
if (pos < length) {
|
| 694 |
|
|
if (!built_meta) {
|
| 695 |
|
|
hdr_build_meta(&meta, layout, entry);
|
| 696 |
|
|
}
|
| 697 |
|
|
|
| 698 |
|
|
left = length - pos;
|
| 699 |
|
|
if (left > count) {
|
| 700 |
|
|
left = count;
|
| 701 |
|
|
}
|
| 702 |
|
|
|
| 703 |
|
|
left -= copy_from_user(((char *)&meta) + pos, buf, left);
|
| 704 |
|
|
init_layout(layout, meta.descrs);
|
| 705 |
|
|
|
| 706 |
|
|
count -= left;
|
| 707 |
|
|
written += left;
|
| 708 |
|
|
pos += left;
|
| 709 |
|
|
buf += left;
|
| 710 |
|
|
|
| 711 |
|
|
/* Handle possible size changes for the forks */
|
| 712 |
|
|
if (entry->type == HFS_CDR_FIL) {
|
| 713 |
|
|
adjust_forks(entry, layout);
|
| 714 |
|
|
hfs_cat_mark_dirty(entry);
|
| 715 |
|
|
}
|
| 716 |
|
|
}
|
| 717 |
|
|
|
| 718 |
|
|
/* Handle the actual data */
|
| 719 |
|
|
for (lcv = 0; count && (lcv < layout->entries); ++lcv) {
|
| 720 |
|
|
struct hfs_hdr_descr *descr = layout->order[lcv];
|
| 721 |
|
|
struct hfs_fork *fork;
|
| 722 |
|
|
char tmp[16], *p;
|
| 723 |
|
|
off_t limit;
|
| 724 |
|
|
|
| 725 |
|
|
/* stop writing if we run out of descriptors early */
|
| 726 |
|
|
if (!descr) {
|
| 727 |
|
|
break;
|
| 728 |
|
|
}
|
| 729 |
|
|
|
| 730 |
|
|
/* find start and length of this entry */
|
| 731 |
|
|
start = descr->offset;
|
| 732 |
|
|
if ((descr->id == HFS_HDR_DATA) ||
|
| 733 |
|
|
(descr->id == HFS_HDR_RSRC)) {
|
| 734 |
|
|
if (entry->type == HFS_CDR_FIL) {
|
| 735 |
|
|
length = 0x7fffffff - start;
|
| 736 |
|
|
} else {
|
| 737 |
|
|
continue;
|
| 738 |
|
|
}
|
| 739 |
|
|
} else {
|
| 740 |
|
|
length = dlength(descr, entry);
|
| 741 |
|
|
}
|
| 742 |
|
|
|
| 743 |
|
|
/* Trim length to avoid overlap with the next entry */
|
| 744 |
|
|
if (layout->order[lcv+1] &&
|
| 745 |
|
|
((start + length) > layout->order[lcv+1]->offset)) {
|
| 746 |
|
|
length = layout->order[lcv+1]->offset - start;
|
| 747 |
|
|
}
|
| 748 |
|
|
|
| 749 |
|
|
/* Skip to next entry if this one is empty or isn't needed */
|
| 750 |
|
|
if (!length || (pos >= start + length)) {
|
| 751 |
|
|
continue;
|
| 752 |
|
|
}
|
| 753 |
|
|
|
| 754 |
|
|
/* Skip any padding that may exist between entries */
|
| 755 |
|
|
if (pos < start) {
|
| 756 |
|
|
left = start - pos;
|
| 757 |
|
|
if (left > count) {
|
| 758 |
|
|
left = count;
|
| 759 |
|
|
}
|
| 760 |
|
|
count -= left;
|
| 761 |
|
|
written += left;
|
| 762 |
|
|
pos += left;
|
| 763 |
|
|
buf += left;
|
| 764 |
|
|
}
|
| 765 |
|
|
if (!count) {
|
| 766 |
|
|
goto done;
|
| 767 |
|
|
}
|
| 768 |
|
|
|
| 769 |
|
|
/* locate and/or construct the data for this entry */
|
| 770 |
|
|
fork = NULL;
|
| 771 |
|
|
p = NULL;
|
| 772 |
|
|
switch (descr->id) {
|
| 773 |
|
|
case HFS_HDR_DATA:
|
| 774 |
|
|
#if 0
|
| 775 |
|
|
/* Can't yet write to the data fork via a header file, since there is the
|
| 776 |
|
|
* possibility to write via the data file, and the only locking is at the
|
| 777 |
|
|
* inode level.
|
| 778 |
|
|
*/
|
| 779 |
|
|
fork = &entry->u.file.data_fork;
|
| 780 |
|
|
limit = length;
|
| 781 |
|
|
#else
|
| 782 |
|
|
limit = 0;
|
| 783 |
|
|
#endif
|
| 784 |
|
|
break;
|
| 785 |
|
|
|
| 786 |
|
|
case HFS_HDR_RSRC:
|
| 787 |
|
|
fork = &entry->u.file.rsrc_fork;
|
| 788 |
|
|
limit = length;
|
| 789 |
|
|
break;
|
| 790 |
|
|
|
| 791 |
|
|
case HFS_HDR_OLDI:
|
| 792 |
|
|
case HFS_HDR_DATES:
|
| 793 |
|
|
get_dates(entry, inode, (hfs_u32 *)tmp);
|
| 794 |
|
|
if (descr->id == HFS_HDR_DATES) {
|
| 795 |
|
|
memcpy(tmp + 12, tmp + 4, 4);
|
| 796 |
|
|
} else if ((entry->type == HFS_CDR_FIL) &&
|
| 797 |
|
|
(entry->u.file.flags & HFS_FIL_LOCK)) {
|
| 798 |
|
|
hfs_put_hl(HFS_AFP_RDONLY, tmp + 12);
|
| 799 |
|
|
} else {
|
| 800 |
|
|
hfs_put_nl(0, tmp + 12);
|
| 801 |
|
|
}
|
| 802 |
|
|
p = tmp;
|
| 803 |
|
|
limit = 16;
|
| 804 |
|
|
break;
|
| 805 |
|
|
|
| 806 |
|
|
case HFS_HDR_FINFO:
|
| 807 |
|
|
p = (char *)&entry->info;
|
| 808 |
|
|
limit = 32;
|
| 809 |
|
|
break;
|
| 810 |
|
|
|
| 811 |
|
|
case HFS_HDR_AFPI:
|
| 812 |
|
|
hfs_put_ns(0, tmp);
|
| 813 |
|
|
if ((entry->type == HFS_CDR_FIL) &&
|
| 814 |
|
|
(entry->u.file.flags & HFS_FIL_LOCK)) {
|
| 815 |
|
|
hfs_put_hs(HFS_AFP_RDONLY, tmp + 2);
|
| 816 |
|
|
} else {
|
| 817 |
|
|
hfs_put_ns(0, tmp + 2);
|
| 818 |
|
|
}
|
| 819 |
|
|
p = tmp;
|
| 820 |
|
|
limit = 4;
|
| 821 |
|
|
break;
|
| 822 |
|
|
|
| 823 |
|
|
case HFS_HDR_PRODOSI:
|
| 824 |
|
|
/* XXX: this needs to do mac->prodos translations */
|
| 825 |
|
|
memset(tmp, 0, 8);
|
| 826 |
|
|
#if 0
|
| 827 |
|
|
hfs_put_ns(0, tmp); /* access */
|
| 828 |
|
|
hfs_put_ns(0, tmp); /* type */
|
| 829 |
|
|
hfs_put_nl(0, tmp); /* aux type */
|
| 830 |
|
|
#endif
|
| 831 |
|
|
p = tmp;
|
| 832 |
|
|
limit = 8;
|
| 833 |
|
|
break;
|
| 834 |
|
|
|
| 835 |
|
|
case HFS_HDR_MACI:
|
| 836 |
|
|
hfs_put_ns(0, tmp);
|
| 837 |
|
|
if (entry->type == HFS_CDR_FIL) {
|
| 838 |
|
|
hfs_put_hs(entry->u.file.flags, tmp + 2);
|
| 839 |
|
|
} else {
|
| 840 |
|
|
hfs_put_ns(entry->u.dir.flags, tmp + 2);
|
| 841 |
|
|
}
|
| 842 |
|
|
p = tmp;
|
| 843 |
|
|
limit = 4;
|
| 844 |
|
|
break;
|
| 845 |
|
|
|
| 846 |
|
|
case HFS_HDR_FNAME: /* Can't rename a file this way */
|
| 847 |
|
|
case HFS_HDR_DID: /* can't specify a did this way */
|
| 848 |
|
|
default:
|
| 849 |
|
|
limit = 0;
|
| 850 |
|
|
}
|
| 851 |
|
|
|
| 852 |
|
|
/* limit the transfer to the available data
|
| 853 |
|
|
of to the stated length of the entry. */
|
| 854 |
|
|
if (length > limit) {
|
| 855 |
|
|
length = limit;
|
| 856 |
|
|
}
|
| 857 |
|
|
offset = pos - start;
|
| 858 |
|
|
left = length - offset;
|
| 859 |
|
|
if (left > count) {
|
| 860 |
|
|
left = count;
|
| 861 |
|
|
}
|
| 862 |
|
|
if (left <= 0) {
|
| 863 |
|
|
continue;
|
| 864 |
|
|
}
|
| 865 |
|
|
|
| 866 |
|
|
/* transfer the data from user space */
|
| 867 |
|
|
if (p) {
|
| 868 |
|
|
left -= copy_from_user(p + offset, buf, left);
|
| 869 |
|
|
} else if (fork) {
|
| 870 |
|
|
left = hfs_do_write(inode, fork, offset, buf, left);
|
| 871 |
|
|
}
|
| 872 |
|
|
|
| 873 |
|
|
/* process the data */
|
| 874 |
|
|
switch (descr->id) {
|
| 875 |
|
|
case HFS_HDR_OLDI:
|
| 876 |
|
|
set_dates(entry, inode, (hfs_u32 *)tmp);
|
| 877 |
|
|
if (entry->type == HFS_CDR_FIL) {
|
| 878 |
|
|
hfs_u8 new_flags = entry->u.file.flags;
|
| 879 |
|
|
|
| 880 |
|
|
if (hfs_get_nl(tmp+12) & htonl(HFS_AFP_WRI)) {
|
| 881 |
|
|
new_flags |= HFS_FIL_LOCK;
|
| 882 |
|
|
} else {
|
| 883 |
|
|
new_flags &= ~HFS_FIL_LOCK;
|
| 884 |
|
|
}
|
| 885 |
|
|
|
| 886 |
|
|
if (new_flags != entry->u.file.flags) {
|
| 887 |
|
|
entry->u.file.flags = new_flags;
|
| 888 |
|
|
hfs_cat_mark_dirty(entry);
|
| 889 |
|
|
hfs_file_fix_mode(entry);
|
| 890 |
|
|
}
|
| 891 |
|
|
}
|
| 892 |
|
|
break;
|
| 893 |
|
|
|
| 894 |
|
|
case HFS_HDR_DATES:
|
| 895 |
|
|
set_dates(entry, inode, (hfs_u32 *)tmp);
|
| 896 |
|
|
break;
|
| 897 |
|
|
|
| 898 |
|
|
case HFS_HDR_FINFO:
|
| 899 |
|
|
hfs_cat_mark_dirty(entry);
|
| 900 |
|
|
break;
|
| 901 |
|
|
|
| 902 |
|
|
case HFS_HDR_MACI:
|
| 903 |
|
|
if (entry->type == HFS_CDR_DIR) {
|
| 904 |
|
|
hfs_u16 new_flags = hfs_get_ns(tmp + 2);
|
| 905 |
|
|
|
| 906 |
|
|
if (entry->u.dir.flags != new_flags) {
|
| 907 |
|
|
entry->u.dir.flags = new_flags;
|
| 908 |
|
|
hfs_cat_mark_dirty(entry);
|
| 909 |
|
|
}
|
| 910 |
|
|
} else {
|
| 911 |
|
|
hfs_u8 new_flags = tmp[3];
|
| 912 |
|
|
hfs_u8 changed = entry->u.file.flags^new_flags;
|
| 913 |
|
|
|
| 914 |
|
|
if (changed) {
|
| 915 |
|
|
entry->u.file.flags = new_flags;
|
| 916 |
|
|
hfs_cat_mark_dirty(entry);
|
| 917 |
|
|
if (changed & HFS_FIL_LOCK) {
|
| 918 |
|
|
hfs_file_fix_mode(entry);
|
| 919 |
|
|
}
|
| 920 |
|
|
}
|
| 921 |
|
|
}
|
| 922 |
|
|
break;
|
| 923 |
|
|
|
| 924 |
|
|
case HFS_HDR_DATA:
|
| 925 |
|
|
case HFS_HDR_RSRC:
|
| 926 |
|
|
if (left <= 0) {
|
| 927 |
|
|
if (!written) {
|
| 928 |
|
|
return left;
|
| 929 |
|
|
} else {
|
| 930 |
|
|
goto done;
|
| 931 |
|
|
}
|
| 932 |
|
|
} else if (fork->lsize > descr->length) {
|
| 933 |
|
|
descr->length = fork->lsize;
|
| 934 |
|
|
}
|
| 935 |
|
|
break;
|
| 936 |
|
|
|
| 937 |
|
|
case HFS_HDR_FNAME: /* Can't rename a file this way */
|
| 938 |
|
|
case HFS_HDR_DID: /* Can't specify a did this way */
|
| 939 |
|
|
case HFS_HDR_PRODOSI: /* not implemented yet */
|
| 940 |
|
|
case HFS_HDR_AFPI: /* ditto */
|
| 941 |
|
|
default:
|
| 942 |
|
|
break;
|
| 943 |
|
|
}
|
| 944 |
|
|
|
| 945 |
|
|
count -= left;
|
| 946 |
|
|
written += left;
|
| 947 |
|
|
pos += left;
|
| 948 |
|
|
buf += left;
|
| 949 |
|
|
}
|
| 950 |
|
|
|
| 951 |
|
|
/* Skip any padding at the end */
|
| 952 |
|
|
if (count) {
|
| 953 |
|
|
written += count;
|
| 954 |
|
|
pos += count;
|
| 955 |
|
|
}
|
| 956 |
|
|
|
| 957 |
|
|
done:
|
| 958 |
|
|
*ppos = pos;
|
| 959 |
|
|
if (written > 0) {
|
| 960 |
|
|
if (pos > inode->i_size)
|
| 961 |
|
|
inode->i_size = pos;
|
| 962 |
|
|
inode->i_mtime = inode->i_atime = CURRENT_TIME;
|
| 963 |
|
|
mark_inode_dirty(inode);
|
| 964 |
|
|
}
|
| 965 |
|
|
return written;
|
| 966 |
|
|
}
|
| 967 |
|
|
|
| 968 |
|
|
/*
|
| 969 |
|
|
* hdr_truncate()
|
| 970 |
|
|
*
|
| 971 |
|
|
* This is the truncate field in the inode_operations structure for
|
| 972 |
|
|
* header files. The purpose is to allocate or release blocks as needed
|
| 973 |
|
|
* to satisfy a change in file length.
|
| 974 |
|
|
*/
|
| 975 |
|
|
void hdr_truncate(struct inode *inode, size_t size)
|
| 976 |
|
|
{
|
| 977 |
|
|
struct hfs_cat_entry *entry = HFS_I(inode)->entry;
|
| 978 |
|
|
struct hfs_hdr_layout *layout;
|
| 979 |
|
|
int lcv, last;
|
| 980 |
|
|
|
| 981 |
|
|
inode->i_size = size;
|
| 982 |
|
|
if (!HFS_I(inode)->layout) {
|
| 983 |
|
|
HFS_I(inode)->layout = dup_layout(HFS_I(inode)->default_layout);
|
| 984 |
|
|
}
|
| 985 |
|
|
layout = HFS_I(inode)->layout;
|
| 986 |
|
|
|
| 987 |
|
|
last = layout->entries - 1;
|
| 988 |
|
|
for (lcv = 0; lcv <= last; ++lcv) {
|
| 989 |
|
|
struct hfs_hdr_descr *descr = layout->order[lcv];
|
| 990 |
|
|
struct hfs_fork *fork;
|
| 991 |
|
|
hfs_u32 offset;
|
| 992 |
|
|
|
| 993 |
|
|
if (!descr) {
|
| 994 |
|
|
break;
|
| 995 |
|
|
}
|
| 996 |
|
|
|
| 997 |
|
|
if (descr->id == HFS_HDR_RSRC) {
|
| 998 |
|
|
fork = &entry->u.file.rsrc_fork;
|
| 999 |
|
|
#if 0
|
| 1000 |
|
|
/* Can't yet truncate the data fork via a header file, since there is the
|
| 1001 |
|
|
* possibility to truncate via the data file, and the only locking is at
|
| 1002 |
|
|
* the inode level.
|
| 1003 |
|
|
*/
|
| 1004 |
|
|
} else if (descr->id == HFS_HDR_DATA) {
|
| 1005 |
|
|
fork = &entry->u.file.data_fork;
|
| 1006 |
|
|
#endif
|
| 1007 |
|
|
} else {
|
| 1008 |
|
|
continue;
|
| 1009 |
|
|
}
|
| 1010 |
|
|
|
| 1011 |
|
|
offset = descr->offset;
|
| 1012 |
|
|
|
| 1013 |
|
|
if ((lcv != last) && ((offset + descr->length) <= size)) {
|
| 1014 |
|
|
continue;
|
| 1015 |
|
|
}
|
| 1016 |
|
|
|
| 1017 |
|
|
if (offset < size) {
|
| 1018 |
|
|
descr->length = size - offset;
|
| 1019 |
|
|
} else {
|
| 1020 |
|
|
descr->length = 0;
|
| 1021 |
|
|
}
|
| 1022 |
|
|
if (fork->lsize != descr->length) {
|
| 1023 |
|
|
fork->lsize = descr->length;
|
| 1024 |
|
|
hfs_extent_adj(fork);
|
| 1025 |
|
|
hfs_cat_mark_dirty(entry);
|
| 1026 |
|
|
}
|
| 1027 |
|
|
}
|
| 1028 |
|
|
}
|
