396 lines
14 KiB
C
396 lines
14 KiB
C
/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2007, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CIO_H
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#define __CIO_H
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/**
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@file cio.h
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@brief Implementation of a byte input-output process (CIO)
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The functions in CIO.C have for goal to realize a byte input / output process.
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*/
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/** @defgroup CIO CIO - byte input-output stream */
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/*@{*/
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#include "opj_config.h"
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/** @name Exported functions (see also openjpeg.h) */
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/*@{*/
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/* ----------------------------------------------------------------------- */
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/**
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Number of bytes left before the end of the stream
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@param cio CIO handle
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@return Returns the number of bytes before the end of the stream
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*/
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int cio_numbytesleft(opj_cio_t *cio);
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/**
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Get pointer to the current position in the stream
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@param cio CIO handle
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@return Returns a pointer to the current position
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*/
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unsigned char *cio_getbp(opj_cio_t *cio);
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/**
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Write some bytes
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@param cio CIO handle
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@param v Value to write
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@param n Number of bytes to write
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@return Returns the number of bytes written or 0 if an error occured
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*/
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unsigned int cio_write(opj_cio_t *cio, unsigned long long int v, int n);
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/**
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Read some bytes
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@param cio CIO handle
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@param n Number of bytes to read
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@return Returns the value of the n bytes read
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*/
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unsigned int cio_read(opj_cio_t *cio, int n);
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/**
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Skip some bytes
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@param cio CIO handle
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@param n Number of bytes to skip
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*/
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void cio_skip(opj_cio_t *cio, int n);
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/* ----------------------------------------------------------------------- */
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/*@}*/
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/*@}*/
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/* ----------------------------------------------------------------------- */
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#if defined(OPJ_BIG_ENDIAN)
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#if !defined(OPJ_LITTLE_ENDIAN)
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#define opj_write_bytes opj_write_bytes_BE
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#define opj_read_bytes opj_read_bytes_BE
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#define opj_write_double opj_write_double_BE
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#define opj_read_double opj_read_double_BE
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#define opj_write_float opj_write_float_BE
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#define opj_read_float opj_read_float_BE
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#else
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#error "Either BIG_ENDIAN or LITTLE_ENDIAN must be #defined, but not both."
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#endif
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#else
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#if defined(OPJ_LITTLE_ENDIAN)
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#define opj_write_bytes opj_write_bytes_LE
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#define opj_read_bytes opj_read_bytes_LE
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#define opj_write_double opj_write_double_LE
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#define opj_read_double opj_read_double_LE
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#define opj_write_float opj_write_float_LE
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#define opj_read_float opj_read_float_LE
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#else
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#error "Either BIG_ENDIAN or LITTLE_ENDIAN must be #defined, but not none."
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#endif
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#endif
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typedef enum
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{
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opj_stream_e_output = 0x1,
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opj_stream_e_input = 0x2,
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opj_stream_e_end = 0x4,
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opj_stream_e_error = 0x8
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}
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opj_stream_flag ;
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/**
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Byte input-output stream.
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*/
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typedef struct opj_stream_private
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{
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/**
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* User data, be it files, ... The actual data depends on the type of the stream.
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*/
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void * m_user_data;
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/**
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* Pointer to actual read function (NULL at the initialization of the cio.
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*/
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opj_stream_read_fn m_read_fn;
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/**
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* Pointer to actual write function (NULL at the initialization of the cio.
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*/
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opj_stream_write_fn m_write_fn;
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/**
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* Pointer to actual skip function (NULL at the initialization of the cio.
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* There is no seek function to prevent from back and forth slow procedures.
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*/
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opj_stream_skip_fn m_skip_fn;
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/**
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* Pointer to actual seek function (if available).
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*/
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opj_stream_seek_fn m_seek_fn;
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/**
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* Actual data stored into the stream if readed from. Data is read by chunk of fixed size.
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* you should never access this data directly.
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*/
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OPJ_BYTE * m_stored_data;
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/**
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* Pointer to the current read data.
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*/
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OPJ_BYTE * m_current_data;
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OPJ_SIZE_T (* m_opj_skip)(struct opj_stream_private * ,OPJ_SIZE_T , struct opj_event_mgr *);
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opj_bool (* m_opj_seek) (struct opj_stream_private * , OPJ_SIZE_T , struct opj_event_mgr *);
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/**
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* number of bytes containing in the buffer.
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*/
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OPJ_UINT32 m_bytes_in_buffer;
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/**
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* The number of bytes read/written.
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*/
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OPJ_SIZE_T m_byte_offset;
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/**
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* The size of the buffer.
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*/
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OPJ_UINT32 m_buffer_size;
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/**
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* Flags to tell the status of the stream.
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*/
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OPJ_UINT32 m_status;
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}
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opj_stream_private_t;
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/**
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @param p_nb_bytes the number of bytes to write
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*/
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void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes);
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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* @param p_nb_bytes the nb bytes to read.
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* @return the number of bytes read or -1 if an error occured.
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*/
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void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes);
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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* @param p_nb_bytes the number of bytes to write
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* @return the number of bytes written or -1 if an error occured
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*/
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void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes);
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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* @param p_nb_bytes the nb bytes to read.
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* @return the number of bytes read or -1 if an error occured.
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*/
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void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes);
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);
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/***
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value);
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value);
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/**
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* Reads some bytes from the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);
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/**
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* Reads some bytes from the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to read data from.
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* @param p_value pointer to the value that will store the data.
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*/
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void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value);
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/**
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* Write some bytes to the given data buffer, this function is used in Little Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);
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/***
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* Write some bytes to the given data buffer, this function is used in Big Endian cpus.
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* @param p_buffer pointer the data buffer to write data to.
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* @param p_value the value to write
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*/
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void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value);
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/**
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* Reads some bytes from the stream.
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* @param p_stream the stream to read data from.
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* @param p_buffer pointer to the data buffer that will receive the data.
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* @param p_size number of bytes to read.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes read, or -1 if an error occured or if the stream is at the end.
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*/
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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);
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/**
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* Writes some bytes to the stream.
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* @param p_stream the stream to write data to.
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* @param p_buffer pointer to the data buffer holds the data to be writtent.
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* @param p_size number of bytes to write.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes writtent, or -1 if an error occured.
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*/
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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);
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/**
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* Writes the content of the stream buffer to the stream.
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* @param p_stream the stream to write data to.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return true if the data could be flushed, false else.
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*/
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opj_bool opj_stream_flush (opj_stream_private_t * p_stream, struct opj_event_mgr * p_event_mgr);
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/**
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* Skips a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes skipped, or -1 if an error occured.
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*/
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OPJ_SIZE_T opj_stream_skip (opj_stream_private_t * p_stream,OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);
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/**
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* Tells the byte offset on the stream (similar to ftell).
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*
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* @param p_stream the stream to get the information from.
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*
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* @return the current position o fthe stream.
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*/
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OPJ_SIZE_T opj_stream_tell (const opj_stream_private_t * p_stream);
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/**
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* Skips a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes skipped, or -1 if an error occured.
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*/
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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);
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/**
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* Skips a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes skipped, or -1 if an error occured.
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*/
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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);
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/**
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* Skips a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes skipped, or -1 if an error occured.
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*/
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opj_bool opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);
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/**
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* Skips a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return the number of bytes skipped, or -1 if an error occured.
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*/
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opj_bool opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);
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/**
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* Seeks a number of bytes from the stream.
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* @param p_stream the stream to skip data from.
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* @param p_size the number of bytes to skip.
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* @param p_event_mgr the user event manager to be notified of special events.
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* @return true if the stream is seekable.
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*/
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opj_bool opj_stream_seek (opj_stream_private_t * p_stream, OPJ_SIZE_T p_size, struct opj_event_mgr * p_event_mgr);
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/**
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* Tells if the given stream is seekable.
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*/
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opj_bool opj_stream_has_seek (const opj_stream_private_t * p_stream);
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OPJ_UINT32 opj_stream_default_read (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data);
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OPJ_UINT32 opj_stream_default_write (void * p_buffer, OPJ_UINT32 p_nb_bytes, void * p_user_data);
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OPJ_SIZE_T opj_stream_default_skip (OPJ_SIZE_T p_nb_bytes, void * p_user_data);
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opj_bool opj_stream_default_seek (OPJ_SIZE_T p_nb_bytes, void * p_user_data);
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#endif /* __CIO_H */
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