/* * 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) #if !defined(OPJ_LITTLE_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 #error "Either BIG_ENDIAN or LITTLE_ENDIAN must be #defined, but not both." #endif #else #if defined(OPJ_LITTLE_ENDIAN) #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 #else #error "Either BIG_ENDIAN or LITTLE_ENDIAN must be #defined, but not none." #endif #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 */