openjpeg/libopenjpeg/cio.h

/*
 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
 * Copyright (c) 2002-2007, Professor Benoit Macq
 * Copyright (c) 2001-2003, David Janssens
 * Copyright (c) 2002-2003, Yannick Verschueren
 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
 * Copyright (c) 2005, Herve Drolon, FreeImage Team
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __CIO_H
#define __CIO_H
/**
@file cio.h
@brief Implementation of a byte input-output process (CIO)

The functions in CIO.C have for goal to realize a byte input / output process.
*/

/** @defgroup CIO CIO - byte input-output stream */
/*@{*/

#include "opj_config.h"

/** @name Exported functions (see also openjpeg.h) */
/*@{*/
/* ----------------------------------------------------------------------- */
/**
Number of bytes left before the end of the stream
@param cio CIO handle
@return Returns the number of bytes before the end of the stream
*/
int cio_numbytesleft(opj_cio_t *cio);
/**
Get pointer to the current position in the stream
@param cio CIO handle
@return Returns a pointer to the current position
*/
unsigned char *cio_getbp(opj_cio_t *cio);
/**
Write some bytes
@param cio CIO handle
@param v Value to write
@param n Number of bytes to write
@return Returns the number of bytes written or 0 if an error occured
*/
unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n);
/**
Read some bytes
@param cio CIO handle
@param n Number of bytes to read
@return Returns the value of the n bytes read
*/
unsigned int cio_read(opj_cio_t *cio, int n);
/**
Skip some bytes
@param cio CIO handle
@param n Number of bytes to skip
*/
void cio_skip(opj_cio_t *cio, int n);
/* ----------------------------------------------------------------------- */
/*@}*/

/*@}*/



/* ----------------------------------------------------------------------- */

#if defined(OPJ_BIG_ENDIAN)
	#define opj_write_bytes		opj_write_bytes_BE
	#define opj_read_bytes		opj_read_bytes_BE
	#define opj_write_double	opj_write_double_BE
	#define opj_read_double		opj_read_double_BE
	#define opj_write_float		opj_write_float_BE
	#define opj_read_float		opj_read_float_BE
#else
	#define opj_write_bytes		opj_write_bytes_LE
	#define opj_read_bytes		opj_read_bytes_LE
	#define opj_write_double	opj_write_double_LE
	#define opj_read_double		opj_read_double_LE
	#define opj_write_float		opj_write_float_LE
	#define opj_read_float		opj_read_float_LE
#endif



typedef enum
{
	opj_stream_e_output		= 0x1,
	opj_stream_e_input		= 0x2,
	opj_stream_e_end		= 0x4,
	opj_stream_e_error		= 0x8
}
opj_stream_flag ;

/**
Byte input-output stream.
*/
typedef struct opj_stream_private
{
	/**
	 * User data, be it files, ... The actual data depends on the type of the stream.
	 */
	void *					m_user_data;

	/**
	 * Pointer to actual read function (NULL at the initialization of the cio.
	 */
	opj_stream_read_fn		m_read_fn;

	/**
	 * Pointer to actual write function (NULL at the initialization of the cio.
	 */
	opj_stream_write_fn		m_write_fn;

	/**
	 * Pointer to actual skip function (NULL at the initialization of the cio.
	 * There is no seek function to prevent from back and forth slow procedures.
	 */
	opj_stream_skip_fn		m_skip_fn;

	/**
	 * Pointer to actual seek function (if available).
	 */
	opj_stream_seek_fn		m_seek_fn;




	/**
	 * Actual data stored into the stream if readed from. Data is read by chunk of fixed size.
	 * you should never access this data directly.
	 */
	OPJ_BYTE *					m_stored_data;

	/**
	 * Pointer to the current read data.
	 */
	OPJ_BYTE *					m_current_data;

	OPJ_SIZE_T (* m_opj_skip)(struct opj_stream_private * ,OPJ_SIZE_T , struct opj_event_mgr *);

	opj_bool (* m_opj_seek) (struct opj_stream_private * , OPJ_SIZE_T , struct opj_event_mgr *);

	/**
	 * number of bytes containing in the buffer.
	 */
	OPJ_UINT32			m_bytes_in_buffer;

	/**
	 * The number of bytes read/written.
	 */
	OPJ_SIZE_T			m_byte_offset;

	/**
	 * The size of the buffer.
	 */
	OPJ_UINT32			m_buffer_size;

	/**
	 * Flags to tell the status of the stream.
	 */
	OPJ_UINT32			m_status;

}
opj_stream_private_t;


/**
 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 * @param p_nb_bytes	the number of bytes to write
*/
void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes);

/**
 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 * @param p_nb_bytes	the nb bytes to read.
 * @return				the number of bytes read or -1 if an error occured.
 */
void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes);

/**
 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 * @param p_nb_bytes	the number of bytes to write
 * @return				the number of bytes written or -1 if an error occured
*/
void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes);

/**
 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 * @param p_nb_bytes	the nb bytes to read.
 * @return				the number of bytes read or -1 if an error occured.
 */
void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes);


/**
 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 */
void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);

/***
 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 */
void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);

/**
 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 */
void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);

/**
 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 */
void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);

/**
 * Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 */
void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);

/**
 * Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to read data from.
 * @param p_value		pointer to the value that will store the data.
 */
void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);

/**
 * Write some bytes to the given data buffer, this function is used in Little Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 */
void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);

/***
 * Write some bytes to the given data buffer, this function is used in Big Endian cpus.
 * @param p_buffer		pointer the data buffer to write data to.
 * @param p_value		the value to write
 */
void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);

/**
 * Reads some bytes from the stream.
 * @param		p_stream	the stream to read data from.
 * @param		p_buffer	pointer to the data buffer that will receive the data.
 * @param		p_size		number of bytes to read.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes read, or -1 if an error occured or if the stream is at the end.
 */
OPJ_UINT32 opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_UINT32 p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Writes some bytes to the stream.
 * @param		p_stream	the stream to write data to.
 * @param		p_buffer	pointer to the data buffer holds the data to be writtent.
 * @param		p_size		number of bytes to write.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes writtent, or -1 if an error occured.
 */
OPJ_UINT32 opj_stream_write_data (opj_stream_private_t * p_stream,const OPJ_BYTE * p_buffer, OPJ_UINT32 p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Writes the content of the stream buffer to the stream.
 * @param		p_stream	the stream to write data to.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		true if the data could be flushed, false else.
 */
opj_bool opj_stream_flush (opj_stream_private_t * p_stream, struct opj_event_mgr * p_event_mgr);

/**
 * Skips a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes skipped, or -1 if an error occured.
 */
OPJ_SIZE_T opj_stream_skip (opj_stream_private_t * p_stream,OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Tells the byte offset on the stream (similar to ftell).
 *
 * @param		p_stream	the stream to get the information from.
 *
 * @return		the current position o fthe stream.
 */
OPJ_SIZE_T opj_stream_tell (const opj_stream_private_t * p_stream);

/**
 * Skips a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes skipped, or -1 if an error occured.
 */
OPJ_SIZE_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Skips a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes skipped, or -1 if an error occured.
 */
OPJ_SIZE_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Skips a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes skipped, or -1 if an error occured.
 */
opj_bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Skips a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		the number of bytes skipped, or -1 if an error occured.
 */
opj_bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Seeks a number of bytes from the stream.
 * @param		p_stream	the stream to skip data from.
 * @param		p_size		the number of bytes to skip.
 * @param		p_event_mgr	the user event manager to be notified of special events.
 * @return		true if the stream is seekable.
 */
opj_bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);

/**
 * Tells if the given stream is seekable.
 */
opj_bool opj_stream_has_seek (const opj_stream_private_t * p_stream);

OPJ_UINT32 opj_stream_default_read (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data);
OPJ_UINT32 opj_stream_default_write (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data);
OPJ_SIZE_T opj_stream_default_skip (OPJ_SIZE_T p_nb_bytes, void * p_user_data);
opj_bool opj_stream_default_seek (OPJ_SIZE_T p_nb_bytes, void * p_user_data);



#endif /* __CIO_H */