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/*
* 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_STREAM_H_
#define LIBISO_STREAM_H_
/*
* Definitions of streams.
*/
#include "fsource.h"
/*
* Some functions here will be moved to libisofs.h when we expose
* Streams.
*/
typedef struct Iso_Stream IsoStream;
struct Iso_Stream
{
/**
* Opens the stream.
*
* @return
* 1 on success, < 0 on error
*/
int (*open)(IsoStream *stream);
/**
* Close the Stream.
* @return 1 on success, < 0 on error
*/
int (*close)(IsoStream *stream);
/**
* Get the size (in bytes) of the stream.
* @return
* The size, or -1 on error
*/
off_t (*get_size)(IsoStream *stream);
/**
* Attempts to read up to count bytes from the given stream into
* the buffer starting at buf.
*
* The stream must be open() before calling this, and close() when no
* more needed.
*
* @return
* number of bytes read, 0 if EOF, < 0 on error
*/
int (*read)(IsoStream *stream, void *buf, size_t count);
/**
* Whether this Stram can be read several times, with the same results.
* For example, a regular file is repeatable, you can read it as many
* times as you want. However, a pipe isn't.
*
* This function doesn't take into account if the file has been modified
* between the two reads.
*
* @return
* 1 if stream is repeatable, 0 if not, < 0 on error
*/
int (*is_repeatable)(IsoStream *stream);
/**
* Get an unique identifier for the IsoStream. If your implementation
* is unable to return a valid identifier, this function should return
* 0.
*
* @return
* 1 on success, 0 if idenfier is not valid, < 0 error
*/
int (*get_id)(IsoStream *stream, unsigned int *fs_id, dev_t *dev_id,
ino_t *ino_id);
/**
* Free implementation specific data. Should never be called by user.
* Use iso_stream_unref() instead.
*/
void (*free)(IsoStream *stream);
int refcount;
void *data;
};
void iso_stream_ref(IsoStream *stream);
void iso_stream_unref(IsoStream *stream);
/**
* Create a stream to read from a IsoFileSource.
* The stream will take the ref. to the IsoFileSource, so after a successfully
* exectution of this function, you musn't unref() the source, unless you
* take an extra ref.
*
* @return
* 1 sucess, < 0 error
* Possible errors:
*
*/
int iso_file_source_stream_new(IsoFileSource *src, IsoStream **stream);
#endif /*STREAM_H_*/