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libisofs/libisofs/fs_image.c

2643 lines
77 KiB

/*
* Copyright (c) 2007 Vreixo Formoso
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
/*
* Filesystem/FileSource implementation to access an ISO image, using an
* IsoDataSource to read image data.
*/
#include "libisofs.h"
#include "ecma119.h"
#include "messages.h"
#include "rockridge.h"
#include "image.h"
#include "tree.h"
#include "eltorito.h"
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <langinfo.h>
#include <limits.h>
/**
* Options for image reading.
* There are four kind of options:
* - Related to multisession support.
* In most cases, an image begins at LBA 0 of the data source. However,
* in multisession discs, the later image begins in the last session on
* disc. The block option can be used to specify the start of that last
* session.
* - Related to the tree that will be read.
* As default, when Rock Ridge extensions are present in the image, that
* will be used to get the tree. If RR extensions are not present, libisofs
* will use the Joliet extensions if available. Finally, the plain ISO-9660
* tree is used if neither RR nor Joliet extensions are available. With
* norock, nojoliet, and preferjoliet options, you can change this
* default behavior.
* - Related to default POSIX attributes.
* When Rock Ridege extensions are not used, libisofs can't figure out what
* are the the permissions, uid or gid for the files. You should supply
* default values for that.
*/
struct iso_read_opts
{
/**
* Block where the image begins, usually 0, can be different on a
* multisession disc.
*/
uint32_t block;
unsigned int norock : 1; /*< Do not read Rock Ridge extensions */
unsigned int nojoliet : 1; /*< Do not read Joliet extensions */
unsigned int noiso1999 : 1; /*< Do not read ISO 9660:1999 enhanced tree */
/**
* When both Joliet and RR extensions are present, the RR tree is used.
* If you prefer using Joliet, set this to 1.
*/
unsigned int preferjoliet : 1;
uid_t uid; /**< Default uid when no RR */
gid_t gid; /**< Default uid when no RR */
mode_t dir_mode; /**< Default mode when no RR (only permissions) */
mode_t file_mode;
/* TODO #00024 : option to convert names to lower case for iso reading */
/**
* Input charset for RR file names. NULL to use default locale charset.
*/
char *input_charset;
};
/**
* Return information for image.
* Both size, hasRR and hasJoliet will be filled by libisofs with suitable
* values.
*/
struct iso_read_image_features
{
/**
* Will be filled with the size (in 2048 byte block) of the image, as
* reported in the PVM.
*/
uint32_t size;
/** It will be set to 1 if RR extensions are present, to 0 if not. */
unsigned int hasRR :1;
/** It will be set to 1 if Joliet extensions are present, to 0 if not. */
unsigned int hasJoliet :1;
/**
* It will be set to 1 if the image is an ISO 9660:1999, i.e. it has
* a version 2 Enhanced Volume Descriptor.
*/
unsigned int hasIso1999 :1;
/** It will be set to 1 if El-Torito boot record is present, to 0 if not.*/
unsigned int hasElTorito :1;
};
static int ifs_fs_open(IsoImageFilesystem *fs);
static int ifs_fs_close(IsoImageFilesystem *fs);
static int iso_file_source_new_ifs(IsoImageFilesystem *fs,
IsoFileSource *parent, struct ecma119_dir_record *record,
IsoFileSource **src);
/** unique identifier for each image */
unsigned int fs_dev_id = 0;
/**
* Should the RR extensions be read?
*/
enum read_rr_ext {
RR_EXT_NO = 0, /*< Do not use RR extensions */
RR_EXT_110 = 1, /*< RR extensions conforming version 1.10 */
RR_EXT_112 = 2 /*< RR extensions conforming version 1.12 */
};
/**
* Private data for the image IsoFilesystem
*/
typedef struct
{
/** DataSource from where data will be read */
IsoDataSource *src;
/** unique id for the each image (filesystem instance) */
unsigned int id;
/**
* Counter of the times the filesystem has been openned still pending of
* close. It is used to keep track of when we need to actually open or
* close the IsoDataSource.
*/
unsigned int open_count;
uid_t uid; /**< Default uid when no RR */
gid_t gid; /**< Default uid when no RR */
mode_t dir_mode; /**< Default mode when no RR (only permissions) */
mode_t file_mode;
int msgid;
char *input_charset; /**< Input charset for RR names */
char *local_charset; /**< For RR names, will be set to the locale one */
/**
* Will be filled with the block lba of the extend for the root directory
* of the hierarchy that will be read, either from the PVD (ISO, RR) or
* from the SVD (Joliet)
*/
uint32_t iso_root_block;
/**
* Will be filled with the block lba of the extend for the root directory,
* as read from the PVM
*/
uint32_t pvd_root_block;
/**
* Will be filled with the block lba of the extend for the root directory,
* as read from the SVD
*/
uint32_t svd_root_block;
/**
* Will be filled with the block lba of the extend for the root directory,
* as read from the enhanced volume descriptor (ISO 9660:1999)
*/
uint32_t evd_root_block;
/**
* If we need to read RR extensions. i.e., if the image contains RR
* extensions, and the user wants to read them.
*/
enum read_rr_ext rr;
/**
* Bytes skipped within the System Use field of a directory record, before
* the beginning of the SUSP system user entries. See IEEE 1281, SUSP. 5.3.
*/
uint8_t len_skp;
/* Volume attributes */
char *volset_id;
char *volume_id; /**< Volume identifier. */
char *publisher_id; /**< Volume publisher. */
char *data_preparer_id; /**< Volume data preparer. */
char *system_id; /**< Volume system identifier. */
char *application_id; /**< Volume application id */
char *copyright_file_id;
char *abstract_file_id;
char *biblio_file_id;
/* extension information */
/**
* RR version being used in image.
* 0 no RR extension, 1 RRIP 1.10, 2 RRIP 1.12
*/
enum read_rr_ext rr_version;
/** If Joliet extensions are available on image */
unsigned int joliet : 1;
/** If ISO 9660:1999 is available on image */
unsigned int iso1999 : 1;
/**
* Number of blocks of the volume, as reported in the PVM.
*/
uint32_t nblocks;
/* el-torito information */
unsigned int eltorito : 1; /* is el-torito available */
unsigned int bootable:1; /**< If the entry is bootable. */
unsigned char type; /**< The type of image */
unsigned char partition_type; /**< type of partition for HD-emul images */
short load_seg; /**< Load segment for the initial boot image. */
short load_size; /**< Number of sectors to load. */
uint32_t imgblock; /**< Block for El-Torito boot image */
uint32_t catblock; /**< Block for El-Torito catalog */
} _ImageFsData;
typedef struct image_fs_data ImageFileSourceData;
struct image_fs_data
{
IsoImageFilesystem *fs; /**< reference to the image it belongs to */
IsoFileSource *parent; /**< reference to the parent (NULL if root) */
struct stat info; /**< filled struct stat */
char *name; /**< name of this file */
uint32_t block; /**< block of the extend */
unsigned int opened : 2; /**< 0 not opened, 1 opened file, 2 opened dir */
/* info for content reading */
struct
{
/**
* - For regular files, once opened it points to a temporary data
* buffer of 2048 bytes.
* - For dirs, once opened it points to a IsoFileSource* array with
* its children
* - For symlinks, it points to link destination
*/
void *content;
/**
* - For regular files, number of bytes already read.
*/
off_t offset;
} data;
};
struct child_list
{
IsoFileSource *file;
struct child_list *next;
};
void child_list_free(struct child_list *list)
{
struct child_list *temp;
struct child_list *next = list;
while (next != NULL) {
temp = next->next;
iso_file_source_unref(next->file);
free(next);
next = temp;
}
}
static
char* ifs_get_path(IsoFileSource *src)
{
ImageFileSourceData *data;
data = src->data;
if (data->parent == NULL) {
return strdup("");
} else {
char *path = ifs_get_path(data->parent);
int pathlen = strlen(path);
path = realloc(path, pathlen + strlen(data->name) + 2);
path[pathlen] = '/';
path[pathlen + 1] = '\0';
return strcat(path, data->name);
}
}
static
char* ifs_get_name(IsoFileSource *src)
{
ImageFileSourceData *data;
data = src->data;
return data->name == NULL ? NULL : strdup(data->name);
}
static
int ifs_lstat(IsoFileSource *src, struct stat *info)
{
ImageFileSourceData *data;
if (src == NULL || info == NULL) {
return ISO_NULL_POINTER;
}
data = src->data;
*info = data->info;
return ISO_SUCCESS;
}
static
int ifs_stat(IsoFileSource *src, struct stat *info)
{
ImageFileSourceData *data;
if (src == NULL || info == NULL || src->data == NULL) {
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
if (S_ISLNK(data->info.st_mode)) {
/* TODO #00012 : support follow symlinks on image filesystem */
return ISO_FILE_BAD_PATH;
}
*info = data->info;
return ISO_SUCCESS;
}
static
int ifs_access(IsoFileSource *src)
{
/* we always have access, it is controlled by DataSource */
return ISO_SUCCESS;
}
/**
* Read all directory records in a directory, and creates an IsoFileSource for
* each of them, storing them in the data field of the IsoFileSource for the
* given dir.
*/
static
int read_dir(ImageFileSourceData *data)
{
int ret;
uint32_t size;
uint32_t block;
IsoImageFilesystem *fs;
_ImageFsData *fsdata;
struct ecma119_dir_record *record;
uint8_t buffer[BLOCK_SIZE];
IsoFileSource *child = NULL;
uint32_t pos = 0;
uint32_t tlen = 0;
if (data == NULL) {
return ISO_NULL_POINTER;
}
fs = data->fs;
fsdata = fs->data;
block = data->block;
ret = fsdata->src->read_block(fsdata->src, block, buffer);
if (ret < 0) {
return ret;
}
/* "." entry, get size of the dir and skip */
record = (struct ecma119_dir_record *)(buffer + pos);
size = iso_read_bb(record->length, 4, NULL);
tlen += record->len_dr[0];
pos += record->len_dr[0];
/* skip ".." */
record = (struct ecma119_dir_record *)(buffer + pos);
tlen += record->len_dr[0];
pos += record->len_dr[0];
while (tlen < size) {
record = (struct ecma119_dir_record *)(buffer + pos);
if (pos == 2048 || record->len_dr[0] == 0) {
/*
* The directory entries are splitted in several blocks
* read next block
*/
ret = fsdata->src->read_block(fsdata->src, ++block, buffer);
if (ret < 0) {
return ret;
}
tlen += 2048 - pos;
pos = 0;
continue;
}
/*
* What about ignoring files with existence flag?
* if (record->flags[0] & 0x01)
* continue;
*/
/*
* For a extrange reason, mkisofs relocates directories under
* a RR_MOVED dir. It seems that it is only used for that purposes,
* and thus it should be removed from the iso tree before
* generating a new image with libisofs, that don't uses it.
*/
if (data->parent == NULL && record->len_fi[0] == 8
&& !strncmp((char*)record->file_id, "RR_MOVED", 8)) {
iso_msg_debug(fsdata->msgid, "Skipping RR_MOVE entry.");
tlen += record->len_dr[0];
pos += record->len_dr[0];
continue;
}
/*
* We pass a NULL parent instead of dir, to prevent the circular
* reference from child to parent.
*/
ret = iso_file_source_new_ifs(fs, NULL, record, &child);
if (ret < 0) {
return ret;
}
/* add to the child list */
if (ret != 0) {
struct child_list *node;
node = malloc(sizeof(struct child_list));
if (node == NULL) {
iso_file_source_unref(child);
return ISO_OUT_OF_MEM;
}
/*
* Note that we insert in reverse order. This leads to faster
* addition here, but also when adding to the tree, as insertion
* will be done, sorted, in the first position of the list.
*/
node->next = data->data.content;
node->file = child;
data->data.content = node;
}
tlen += record->len_dr[0];
pos += record->len_dr[0];
}
return ISO_SUCCESS;
}
static
int ifs_open(IsoFileSource *src)
{
int ret;
ImageFileSourceData *data;
if (src == NULL || src->data == NULL) {
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
if (data->opened) {
return ISO_FILE_ALREADY_OPENNED;
}
if (S_ISDIR(data->info.st_mode)) {
/* ensure fs is openned */
ret = data->fs->open(data->fs);
if (ret < 0) {
return ret;
}
/*
* Cache all directory entries.
* This can waste more memory, but improves as disc is read in much more
* sequencially way, thus reducing jump between tracks on disc
*/
ret = read_dir(data);
data->fs->close(data->fs);
if (ret < 0) {
/* free probably allocated children */
child_list_free((struct child_list*)data->data.content);
} else {
data->opened = 2;
}
return ret;
} else if (S_ISREG(data->info.st_mode)) {
/* ensure fs is openned */
ret = data->fs->open(data->fs);
if (ret < 0) {
return ret;
}
data->data.content = malloc(BLOCK_SIZE);
if (data->data.content == NULL) {
return ISO_OUT_OF_MEM;
}
data->data.offset = 0;
data->opened = 1;
} else {
/* symlinks and special files inside image can't be openned */
return ISO_FILE_ERROR;
}
return ISO_SUCCESS;
}
static
int ifs_close(IsoFileSource *src)
{
ImageFileSourceData *data;
if (src == NULL || src->data == NULL) {
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
if (!data->opened) {
return ISO_FILE_NOT_OPENNED;
}
if (data->opened == 2) {
/*
* close a dir, free all pending pre-allocated children.
* not that we don't need to close the filesystem, it was already
* closed
*/
child_list_free((struct child_list*) data->data.content);
data->data.content = NULL;
data->opened = 0;
} else if (data->opened == 1) {
/* close regular file */
free(data->data.content);
data->fs->close(data->fs);
data->data.content = NULL;
data->opened = 0;
} else {
/* TODO only dirs and files supported for now */
return ISO_ERROR;
}
return ISO_SUCCESS;
}
/**
* Attempts to read up to count bytes from the given source into
* the buffer starting at buf.
*
* The file src must be open() before calling this, and close() when no
* more needed. Not valid for dirs. On symlinks it reads the destination
* file.
*
* @return
* number of bytes read, 0 if EOF, < 0 on error
* Error codes:
* ISO_FILE_ERROR
* ISO_NULL_POINTER
* ISO_FILE_NOT_OPENNED
* ISO_FILE_IS_DIR
* ISO_OUT_OF_MEM
* ISO_INTERRUPTED
*/
static
int ifs_read(IsoFileSource *src, void *buf, size_t count)
{
int ret;
ImageFileSourceData *data;
uint32_t read = 0;
if (src == NULL || src->data == NULL || buf == NULL) {
return ISO_NULL_POINTER;
}
if (count == 0) {
return ISO_WRONG_ARG_VALUE;
}
data = (ImageFileSourceData*)src->data;
if (!data->opened) {
return ISO_FILE_NOT_OPENNED;
} else if (data->opened != 1) {
return ISO_FILE_IS_DIR;
}
while (read < count && data->data.offset < data->info.st_size) {
size_t bytes;
uint8_t *orig;
if (data->data.offset % BLOCK_SIZE == 0) {
/* we need to buffer next block */
uint32_t block;
_ImageFsData *fsdata;
if (data->data.offset >= data->info.st_size) {
/* EOF */
break;
}
fsdata = data->fs->data;
block = data->block + (data->data.offset / BLOCK_SIZE);
ret = fsdata->src->read_block(fsdata->src, block,
data->data.content);
if (ret < 0) {
return ret;
}
}
/* how much can I read */
bytes = MIN(BLOCK_SIZE - (data->data.offset % BLOCK_SIZE),
count - read);
if (data->data.offset + (off_t)bytes > data->info.st_size) {
bytes = data->info.st_size - data->data.offset;
}
orig = data->data.content;
orig += data->data.offset % BLOCK_SIZE;
memcpy((uint8_t*)buf + read, orig, bytes);
read += bytes;
data->data.offset += (off_t)bytes;
}
return read;
}
static
int ifs_readdir(IsoFileSource *src, IsoFileSource **child)
{
ImageFileSourceData *data, *cdata;
struct child_list *children;
if (src == NULL || src->data == NULL || child == NULL) {
return ISO_NULL_POINTER;
}
data = (ImageFileSourceData*)src->data;
if (!data->opened) {
return ISO_FILE_NOT_OPENNED;
} else if (data->opened != 2) {
return ISO_FILE_IS_NOT_DIR;
}
/* return the first child and free it */
if (data->data.content == NULL) {
return 0; /* EOF */
}
children = (struct child_list*)data->data.content;
*child = children->file;
cdata = (ImageFileSourceData*)(*child)->data;
/* set the ref to the parent */
cdata->parent = src;
iso_file_source_ref(src);
/* free the first element of the list */
data->data.content = children->next;
free(children);
return ISO_SUCCESS;
}
/**
* Read the destination of a symlink. You don't need to open the file
* to call this.
*
* @param buf
* allocated buffer of at least bufsiz bytes.
* The dest. will be copied there, and it will be NULL-terminated
* @param bufsiz
* characters to be copied. Destination link will be truncated if
* it is larger than given size. This include the \0 character.
* @return
* 1 on success, < 0 on error
* Error codes:
* ISO_FILE_ERROR
* ISO_NULL_POINTER
* ISO_WRONG_ARG_VALUE -> if bufsiz <= 0
* ISO_FILE_IS_NOT_SYMLINK
* ISO_OUT_OF_MEM
* ISO_FILE_BAD_PATH
* ISO_FILE_DOESNT_EXIST
*
*/
static
int ifs_readlink(IsoFileSource *src, char *buf, size_t bufsiz)
{
char *dest;
size_t len;
ImageFileSourceData *data;
if (src == NULL || buf == NULL || src->data == NULL) {
return ISO_NULL_POINTER;
}
if (bufsiz <= 0) {
return ISO_WRONG_ARG_VALUE;
}
data = (ImageFileSourceData*)src->data;
if (!S_ISLNK(data->info.st_mode)) {
return ISO_FILE_IS_NOT_SYMLINK;
}
dest = (char*)data->data.content;
len = strlen(dest);
if (bufsiz <= len) {
len = bufsiz - 1;
}
strncpy(buf, dest, len);
buf[len] = '\0';
return ISO_SUCCESS;
}
static
IsoFilesystem* ifs_get_filesystem(IsoFileSource *src)
{
ImageFileSourceData *data;
if (src == NULL) {
return NULL;
}
data = src->data;
return data->fs;
}
static
void ifs_free(IsoFileSource *src)
{
ImageFileSourceData *data;
data = src->data;
/* close the file if it is already openned */
if (data->opened) {
src->class->close(src);
}
/* free destination if it is a link */
if (S_ISLNK(data->info.st_mode)) {
free(data->data.content);
}
iso_filesystem_unref(data->fs);
if (data->parent != NULL) {
iso_file_source_unref(data->parent);
}
free(data->name);
free(data);
}
IsoFileSourceIface ifs_class = {
0, /* version */
ifs_get_path,
ifs_get_name,
ifs_lstat,
ifs_stat,
ifs_access,
ifs_open,
ifs_close,
ifs_read,
ifs_readdir,
ifs_readlink,
ifs_get_filesystem,
ifs_free
};
/**
* Read a file name from a directory record, doing the needed charset
* conversion
*/
static
char *get_name(_ImageFsData *fsdata, const char *str, size_t len)
{
int ret;
char *name = NULL;
if (strcmp(fsdata->local_charset, fsdata->input_charset)) {
/* charset conversion needed */
ret = strnconv(str, fsdata->input_charset, fsdata->local_charset, len,
&name);
if (ret == 1) {
return name;
} else {
ret = iso_msg_submit(fsdata->msgid, ISO_FILENAME_WRONG_CHARSET, ret,
"Charset conversion error. Can't convert %s from %s to %s",
str, fsdata->input_charset, fsdata->local_charset);
if (ret < 0) {
return NULL; /* aborted */
}
/* fallback */
}
}
/* we reach here when the charset conversion is not needed or has failed */
name = malloc(len + 1);
if (name == NULL) {
return NULL;
}
memcpy(name, str, len);
name[len] = '\0';
return name;
}
/**
*
* @return
* 1 success, 0 record ignored (not an error, can be a relocated dir),
* < 0 error
*/
static
int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
struct ecma119_dir_record *record,
IsoFileSource **src)
{
int ret;
struct stat atts;
time_t recorded;
_ImageFsData *fsdata;
IsoFileSource *ifsrc = NULL;
ImageFileSourceData *ifsdata = NULL;
int namecont = 0; /* 1 if found a NM with CONTINUE flag */
char *name = NULL;
/* 1 if found a SL with CONTINUE flag,
* 2 if found a component with continue flag */
int linkdestcont = 0;
char *linkdest = NULL;
uint32_t relocated_dir = 0;
if (fs == NULL || fs->data == NULL || record == NULL || src == NULL) {
return ISO_NULL_POINTER;
}
fsdata = (_ImageFsData*)fs->data;
memset(&atts, 0, sizeof(struct stat));
/*
* First of all, check for unsupported ECMA-119 features
*/
/* check for unsupported multiextend */
if (record->flags[0] & 0x80) {
iso_msg_submit(fsdata->msgid, ISO_UNSUPPORTED_ECMA119, 0,
"Unsupported image. This image makes use of Multi-Extend"
" features, that are not supported at this time. If you "
"need support for that, please request us this feature.");
return ISO_UNSUPPORTED_ECMA119;
}
/* check for unsupported interleaved mode */
if (record->file_unit_size[0] || record->interleave_gap_size[0]) {
iso_msg_submit(fsdata->msgid, ISO_UNSUPPORTED_ECMA119, 0,
"Unsupported image. This image has at least one file recorded "
"in interleaved mode. We don't support this mode, as we think "
"it's not used. If you're reading this, then we're wrong :) "
"Please contact libisofs developers, so we can fix this.");
return ISO_UNSUPPORTED_ECMA119;
}
/*
* Check for extended attributes, that are not supported. Note that even
* if we don't support them, it is easy to ignore them.
*/
if (record->len_xa[0]) {
iso_msg_submit(fsdata->msgid, ISO_UNSUPPORTED_ECMA119, 0,
"Unsupported image. This image has at least one file with "
"Extended Attributes, that are not supported");
return ISO_UNSUPPORTED_ECMA119;
}
/* TODO #00013 : check for unsupported flags when reading a dir record */
/*
* The idea is to read all the RR entries (if we want to do that and RR
* extensions exist on image), storing the info we want from that.
* Then, we need some sanity checks.
* Finally, we select what kind of node it is, and set values properly.
*/
if (fsdata->rr) {
struct susp_sys_user_entry *sue;
SuspIterator *iter;
iter = susp_iter_new(fsdata->src, record, fsdata->len_skp,
fsdata->msgid);
if (iter == NULL) {
return ISO_OUT_OF_MEM;
}
while ((ret = susp_iter_next(iter, &sue)) > 0) {
/* ignore entries from different version */
if (sue->version[0] != 1)
continue;
if (SUSP_SIG(sue, 'P', 'X')) {
ret = read_rr_PX(sue, &atts);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid PX entry");
}
} else if (SUSP_SIG(sue, 'T', 'F')) {
ret = read_rr_TF(sue, &atts);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid TF entry");
}
} else if (SUSP_SIG(sue, 'N', 'M')) {
if (name != NULL && namecont == 0) {
/* ups, RR standard violation */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, 0,
"New NM entry found without previous"
"CONTINUE flag. Ignored");
continue;
}
ret = read_rr_NM(sue, &name, &namecont);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid NM entry");
}
} else if (SUSP_SIG(sue, 'S', 'L')) {
if (linkdest != NULL && linkdestcont == 0) {
/* ups, RR standard violation */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, 0,
"New SL entry found without previous"
"CONTINUE flag. Ignored");
continue;
}
ret = read_rr_SL(sue, &linkdest, &linkdestcont);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid SL entry");
}
} else if (SUSP_SIG(sue, 'R', 'E')) {
/*
* this directory entry refers to a relocated directory.
* We simply ignore it, as it will be correctly handled
* when found the CL
*/
susp_iter_free(iter);
free(name);
return 0; /* it's not an error */
} else if (SUSP_SIG(sue, 'C', 'L')) {
/*
* This entry is a placeholder for a relocated dir.
* We need to ignore other entries, with the exception of NM.
* Then we create a directory node that represents the
* relocated dir, and iterate over its children.
*/
relocated_dir = iso_read_bb(sue->data.CL.child_loc, 4, NULL);
if (relocated_dir == 0) {
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR, 0,
"Invalid SL entry, no child location");
break;
}
} else if (SUSP_SIG(sue, 'P', 'N')) {
ret = read_rr_PN(sue, &atts);
if (ret < 0) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR_WARN, ret,
"Invalid PN entry");
}
} else if (SUSP_SIG(sue, 'S', 'F')) {
ret = iso_msg_submit(fsdata->msgid, ISO_UNSUPPORTED_RR, 0,
"Sparse files not supported.");
break;
} else if (SUSP_SIG(sue, 'R', 'R')) {
/* TODO I've seen this RR on mkisofs images. what's this? */
continue;
} else if (SUSP_SIG(sue, 'S', 'P')) {
/*
* Ignore this, to prevent the hint message, if we are dealing
* with root node (SP is only valid in "." of root node)
*/
if (parent != NULL) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR, 0,
"SP entry found in a directory entry other "
"than '.' entry of root node");
}
continue;
} else if (SUSP_SIG(sue, 'E', 'R')) {
/*
* Ignore this, to prevent the hint message, if we are dealing
* with root node (ER is only valid in "." of root node)
*/
if (parent != NULL) {
/* notify and continue */
ret = iso_msg_submit(fsdata->msgid, ISO_WRONG_RR, 0,
"ER entry found in a directory entry other "
"than '.' entry of root node");