Interface definition for an IsoFileSource. More...
#include <libisofs.h>
Data Fields | |
int | version |
Tells the version of the interface: Version 0 provides functions up to (*lseek)(). | |
char *(* | get_path )(IsoFileSource *src) |
Get the path, relative to the filesystem this file source belongs to. | |
char *(* | get_name )(IsoFileSource *src) |
Get the name of the file, with the dir component of the path. | |
int(* | lstat )(IsoFileSource *src, struct stat *info) |
Get information about the file. | |
int(* | stat )(IsoFileSource *src, struct stat *info) |
Get information about the file. | |
int(* | access )(IsoFileSource *src) |
Check if the process has access to read file contents. | |
int(* | open )(IsoFileSource *src) |
Opens the source. | |
int(* | close )(IsoFileSource *src) |
Close a previuously openned file. | |
int(* | read )(IsoFileSource *src, void *buf, size_t count) |
Attempts to read up to count bytes from the given source into the buffer starting at buf. | |
int(* | readdir )(IsoFileSource *src, IsoFileSource **child) |
Read a directory. | |
int(* | readlink )(IsoFileSource *src, char *buf, size_t bufsiz) |
Read the destination of a symlink. | |
IsoFilesystem *(* | get_filesystem )(IsoFileSource *src) |
Get the filesystem for this source. | |
void(* | free )(IsoFileSource *src) |
Free implementation specific data. | |
off_t(* | lseek )(IsoFileSource *src, off_t offset, int flag) |
Repositions the offset of the IsoFileSource (must be opened) to the given offset according to the value of flag. | |
int(* | get_aa_string )(IsoFileSource *src, unsigned char **aa_string, int flag) |
Valid only if .version is > 0. |
Interface definition for an IsoFileSource.
Defines the POSIX-like function to access files and abstract underlying source.
Definition at line 474 of file libisofs.h.
int(* IsoFileSource_Iface::access)(IsoFileSource *src) |
Check if the process has access to read file contents.
Note that this is not necessarily related with (l)stat functions. For example, in a filesystem implementation to deal with an ISO image, if the user has read access to the image it will be able to read all files inside it, despite of the particular permission of each file in the RR tree, that are what the above functions return.
int(* IsoFileSource_Iface::close)(IsoFileSource *src) |
Close a previuously openned file.
void(* IsoFileSource_Iface::free)(IsoFileSource *src) |
Free implementation specific data.
Should never be called by user. Use iso_file_source_unref() instead.
int(* IsoFileSource_Iface::get_aa_string)(IsoFileSource *src, unsigned char **aa_string, int flag) |
Valid only if .version is > 0.
See above. Get the AAIP string with encoded ACL and xattr. (Not to be confused with ECMA-119 Extended Attributes).
bit1 and bit2 of flag should be implemented so that freshly fetched info does not include the undesired ACL or xattr. Nevertheless if the aa_string is cached, then it is permissible that ACL and xattr are still delivered.
flag | Bitfield for control purposes bit0= Transfer ownership of AAIP string data. src will free the eventual cached data and might not be able to produce it again. bit1= No need to get ACL (no guarantee of exclusion) bit2= No need to get xattr (no guarantee of exclusion) | |
aa_string | Returns a pointer to the AAIP string data. If no AAIP string is available, *aa_string becomes NULL. (See doc/susp_aaip_*_*.txt for the meaning of AAIP and libisofs/aaip_0_2.h for encoding and decoding.) The caller is responsible for finally calling free() on non-NULL results. |
Get the filesystem for this source.
No extra ref is added, so you musn't unref the IsoFilesystem.
char*(* IsoFileSource_Iface::get_name)(IsoFileSource *src) |
Get the name of the file, with the dir component of the path.
char*(* IsoFileSource_Iface::get_path)(IsoFileSource *src) |
Get the path, relative to the filesystem this file source belongs to.
off_t(* IsoFileSource_Iface::lseek)(IsoFileSource *src, off_t offset, int flag) |
Repositions the offset of the IsoFileSource (must be opened) to the given offset according to the value of flag.
offset | in bytes | |
flag | 0 The offset is set to offset bytes (SEEK_SET) 1 The offset is set to its current location plus offset bytes (SEEK_CUR) 2 The offset is set to the size of the file plus offset bytes (SEEK_END). |
int(* IsoFileSource_Iface::lstat)(IsoFileSource *src, struct stat *info) |
Get information about the file.
It is equivalent to lstat(2).
int(* IsoFileSource_Iface::open)(IsoFileSource *src) |
Opens the source.
int(* IsoFileSource_Iface::read)(IsoFileSource *src, void *buf, size_t count) |
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.
int(* IsoFileSource_Iface::readdir)(IsoFileSource *src, IsoFileSource **child) |
Read a directory.
Each call to this function will return a new children, until we reach the end of file (i.e, no more children), in that case it returns 0.
The dir must be open() before calling this, and close() when no more needed. Only valid for dirs.
Note that "." and ".." children MUST NOT BE returned.
child | pointer to be filled with the given child. Undefined on error or OEF |
int(* IsoFileSource_Iface::readlink)(IsoFileSource *src, char *buf, size_t bufsiz) |
Read the destination of a symlink.
You don't need to open the file to call this.
buf | allocated buffer of at least bufsiz bytes. The dest. will be copied there, and it will be NULL-terminated | |
bufsiz | characters to be copied. Destination link will be truncated if it is larger than given size. This include the character. |
int(* IsoFileSource_Iface::stat)(IsoFileSource *src, struct stat *info) |
Get information about the file.
If the file is a symlink, the info returned refers to the destination. It is equivalent to stat(2).
Tells the version of the interface: Version 0 provides functions up to (*lseek)().
Definition at line 483 of file libisofs.h.