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libisofs/src/fsource.h

97 lines
2.2 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.
*/
#ifndef LIBISO_FSOURCE_H_
#define LIBISO_FSOURCE_H_
/*
* Definitions for the file sources.
*/
/*
* Some functions here will be moved to libisofs.h when we expose
* Sources.
*/
#include <sys/stat.h>
typedef struct Iso_File_Source IsoFileSource;
typedef struct Iso_Filesystem IsoFilesystem;
struct Iso_Filesystem
{
/**
*
* @return
* 1 on success, < 0 on error
*/
int (*get_root)(IsoFilesystem *fs, IsoFileSource *root);
};
struct Iso_File_Source
{
/**
*
* @return
* 1 success, < 0 error
*/
int (*lstat)(IsoFileSource *src, struct stat *info);
//stat?
/**
* Opens the source.
* @return 1 on success, < 0 on error
*/
int (*open)(IsoFileSource *src);
void (*close)(IsoFileSource *src);
/**
* 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
*/
int (*read)(IsoFileSource *src, void *buf, size_t count);
/**
* 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.
*
* @param child
* pointer to be filled with the given child. Undefined on error or OEF
* @return
* 1 on success, 0 if EOF (no more children), < 0 on error
*/
int (*readdir)(IsoFileSource *src, IsoFileSource **child);
/**
*
*/
int (*readlink)(IsoFileSource *src, char *buf, size_t bufsiz);
};
#endif /*LIBISO_FSOURCE_H_*/