third_party/libopenjpeg20/cio.c - platform/external/pdfium - Gitiles

 /*
  * The copyright in this software is being made available under the 2-clauses
  * BSD License, included below. This software may be subject to other third
  * party and contributor rights, including patent rights, and no such rights
  * are granted under this license.
  *
  * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
  * Copyright (c) 2002-2014, Professor Benoit Macq
  * Copyright (c) 2001-2003, David Janssens
  * Copyright (c) 2002-2003, Yannick Verschueren
  * Copyright (c) 2003-2007, Francois-Olivier Devaux
  * Copyright (c) 2003-2014, Antonin Descampe
  * Copyright (c) 2005, Herve Drolon, FreeImage Team
  * Copyright (c) 2008, 2011-2012, Centre National d'Etudes Spatiales (CNES), FR
  * Copyright (c) 2012, CS Systemes d'Information, France
  * 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.
  */

 #include "opj_includes.h"

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


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

 void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value)+sizeof(OPJ_UINT32)-p_nb_bytes;

 	assert(p_nb_bytes > 0 && p_nb_bytes <=  sizeof(OPJ_UINT32));

 	memcpy(p_buffer,l_data_ptr,p_nb_bytes);
 }

 void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
 	OPJ_UINT32 i;

 	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

 	for	(i=0;i<p_nb_bytes;++i) {
 		*(p_buffer++) = *(l_data_ptr--);
 	}
 }

 void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);

 	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

 	*p_value = 0;
 	memcpy(l_data_ptr+sizeof(OPJ_UINT32)-p_nb_bytes,p_buffer,p_nb_bytes);
 }

 void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
 	OPJ_UINT32 i;

 	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

 	*p_value = 0;
 	for (i=0;i<p_nb_bytes;++i) {
 		*(l_data_ptr--) = *(p_buffer++);
 	}
 }

 void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
 	memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
 }

 void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
 	OPJ_UINT32 i;
 	for	(i=0;i<sizeof(OPJ_FLOAT64);++i) {
 		*(p_buffer++) = *(l_data_ptr--);
 	}
 }

 void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 	memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
 }

 void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
 	OPJ_UINT32 i;
 	for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
 		*(l_data_ptr--) = *(p_buffer++);
 	}
 }

 void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
 	memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
 }

 void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 {
 	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
 	OPJ_UINT32 i;
 	for	(i=0;i<sizeof(OPJ_FLOAT32);++i) {
 		*(p_buffer++) = *(l_data_ptr--);
 	}
 }

 void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 	memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
 }

 void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 {
 	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
 	OPJ_UINT32 i;
 	for	(i=0;i<sizeof(OPJ_FLOAT32);++i) {
 		*(l_data_ptr--) = *(p_buffer++);
 	}
 }

 opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,OPJ_BOOL l_is_input)
 {
 	opj_stream_private_t * l_stream = 00;
 	l_stream = (opj_stream_private_t*) opj_calloc(1,sizeof(opj_stream_private_t));
 	if (! l_stream) {
 		return 00;
 	}

 	l_stream->m_buffer_size = p_buffer_size;
 	l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
 	if (! l_stream->m_stored_data) {
 		opj_free(l_stream);
 		return 00;
 	}

 	l_stream->m_current_data = l_stream->m_stored_data;

 	if (l_is_input) {
 		l_stream->m_status |= opj_stream_e_input;
 		l_stream->m_opj_skip = opj_stream_read_skip;
 		l_stream->m_opj_seek = opj_stream_read_seek;
 	}
 	else {
 		l_stream->m_status |= opj_stream_e_output;
 		l_stream->m_opj_skip = opj_stream_write_skip;
 		l_stream->m_opj_seek = opj_stream_write_seek;
 	}

 	l_stream->m_read_fn = opj_stream_default_read;
 	l_stream->m_write_fn = opj_stream_default_write;
 	l_stream->m_skip_fn = opj_stream_default_skip;
 	l_stream->m_seek_fn = opj_stream_default_seek;

 	return (opj_stream_t *) l_stream;
 }

 opj_stream_t* OPJ_CALLCONV opj_stream_default_create(OPJ_BOOL l_is_input)
 {
 	return opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,l_is_input);
 }

 void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

 	if (l_stream) {
 		if (l_stream->m_free_user_data_fn) {
 			l_stream->m_free_user_data_fn(l_stream->m_user_data);
 		}
 		opj_free(l_stream->m_stored_data);
 		l_stream->m_stored_data = 00;
 		opj_free(l_stream);
 	}
 }

 void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

 	if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
 		return;
 	}

 	l_stream->m_read_fn = p_function;
 }

 void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

 	if (!l_stream) {
 		return;
 	}
 	l_stream->m_seek_fn = p_function;
 }

 void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

 	if ((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output))) {
 		return;
 	}

 	l_stream->m_write_fn = p_function;
 }

 void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

 	if (! l_stream) {
 		return;
 	}

 	l_stream->m_skip_fn = p_function;
 }

 void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data, opj_stream_free_user_data_fn p_function)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 	if (!l_stream)
 		return;
 	l_stream->m_user_data = p_data;
   l_stream->m_free_user_data_fn = p_function;
 }

 void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
 {
 	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 	if (!l_stream)
 		return;
 	l_stream->m_user_data_length = data_length;
 }

 OPJ_SIZE_T opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	OPJ_SIZE_T l_read_nb_bytes = 0;
 	if (p_stream->m_bytes_in_buffer >= p_size) {
 		memcpy(p_buffer,p_stream->m_current_data,p_size);
 		p_stream->m_current_data += p_size;
 		p_stream->m_bytes_in_buffer -= p_size;
 		l_read_nb_bytes += p_size;
 		p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 		return l_read_nb_bytes;
 	}

 	/* we are now in the case when the remaining data if not sufficient */
 	if (p_stream->m_status & opj_stream_e_end) {
 		l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 		memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 		p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 		p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 		p_stream->m_bytes_in_buffer = 0;
 		return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 	}

 	/* the flag is not set, we copy data and then do an actual read on the stream */
 	if (p_stream->m_bytes_in_buffer) {
 		l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 		memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 		p_stream->m_current_data = p_stream->m_stored_data;
 		p_buffer += p_stream->m_bytes_in_buffer;
 		p_size -= p_stream->m_bytes_in_buffer;
 		p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 		p_stream->m_bytes_in_buffer = 0;
 	}
 	else {
     /* case where we are already at the end of the buffer
        so reset the m_current_data to point to the start of the
        stored buffer to get ready to read from disk*/
 		p_stream->m_current_data = p_stream->m_stored_data;
 	}

 	for (;;) {
 		/* we should read less than a chunk -> read a chunk */
 		if (p_size < p_stream->m_buffer_size) {
 			/* we should do an actual read on the media */
 			p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_stream->m_stored_data,p_stream->m_buffer_size,p_stream->m_user_data);

 			if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 				/* end of stream */
 				opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

 				p_stream->m_bytes_in_buffer = 0;
 				p_stream->m_status |= opj_stream_e_end;
 				/* end of stream */
 				return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 			}
 			else if	(p_stream->m_bytes_in_buffer < p_size) {
 				/* not enough data */
 				l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 				memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 				p_stream->m_current_data = p_stream->m_stored_data;
 				p_buffer += p_stream->m_bytes_in_buffer;
 				p_size -= p_stream->m_bytes_in_buffer;
 				p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 				p_stream->m_bytes_in_buffer = 0;
 			}
 			else {
 				l_read_nb_bytes += p_size;
 				memcpy(p_buffer,p_stream->m_current_data,p_size);
 				p_stream->m_current_data += p_size;
 				p_stream->m_bytes_in_buffer -= p_size;
 				p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 				return l_read_nb_bytes;
 			}
 		}
 		else {
 			/* direct read on the dest buffer */
 			p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);

 			if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 				/*  end of stream */
 				opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

 				p_stream->m_bytes_in_buffer = 0;
 				p_stream->m_status |= opj_stream_e_end;
 				/* end of stream */
 				return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 			}
 			else if (p_stream->m_bytes_in_buffer < p_size) {
 				/* not enough data */
 				l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 				p_stream->m_current_data = p_stream->m_stored_data;
 				p_buffer += p_stream->m_bytes_in_buffer;
 				p_size -= p_stream->m_bytes_in_buffer;
 				p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 				p_stream->m_bytes_in_buffer = 0;
 			}
 			else {
 				/* we have read the exact size */
 				l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 				p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 				p_stream->m_current_data = p_stream->m_stored_data;
 				p_stream->m_bytes_in_buffer = 0;
 				return l_read_nb_bytes;
 			}
 		}
 	}
 }

 OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
 								  const OPJ_BYTE * p_buffer,
 								  OPJ_SIZE_T p_size,
 								  opj_event_mgr_t * p_event_mgr)
 {
 	OPJ_SIZE_T l_remaining_bytes = 0;
 	OPJ_SIZE_T l_write_nb_bytes = 0;

 	if (p_stream->m_status & opj_stream_e_error) {
 		return (OPJ_SIZE_T)-1;
 	}

 	for (;;) {
 		l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;

 		/* we have more memory than required */
 		if (l_remaining_bytes >= p_size) {
 			memcpy(p_stream->m_current_data, p_buffer, p_size);

 			p_stream->m_current_data += p_size;
 			p_stream->m_bytes_in_buffer += p_size;
 			l_write_nb_bytes += p_size;
 			p_stream->m_byte_offset += (OPJ_OFF_T)p_size;

 			return l_write_nb_bytes;
 		}

 		/* we copy data and then do an actual read on the stream */
 		if (l_remaining_bytes) {
 			l_write_nb_bytes += l_remaining_bytes;

 			memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);

 			p_stream->m_current_data = p_stream->m_stored_data;

 			p_buffer += l_remaining_bytes;
 			p_size -= l_remaining_bytes;
 			p_stream->m_bytes_in_buffer += l_remaining_bytes;
 			p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
 		}

 		if (! opj_stream_flush(p_stream, p_event_mgr)) {
 			return (OPJ_SIZE_T)-1;
 		}
 	}

 }

 OPJ_BOOL opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
 {
 	/* the number of bytes written on the media. */
 	OPJ_SIZE_T l_current_write_nb_bytes = 0;

 	p_stream->m_current_data = p_stream->m_stored_data;

 	while (p_stream->m_bytes_in_buffer) {
 		/* we should do an actual write on the media */
 		l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
 														p_stream->m_bytes_in_buffer,
 														p_stream->m_user_data);

 		if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
 			p_stream->m_status |= opj_stream_e_error;
 			opj_event_msg(p_event_mgr, EVT_INFO, "Error on writing stream!\n");

 			return OPJ_FALSE;
 		}

 		p_stream->m_current_data += l_current_write_nb_bytes;
 		p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
 	}

 	p_stream->m_current_data = p_stream->m_stored_data;

 	return OPJ_TRUE;
 }

 OPJ_OFF_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	OPJ_OFF_T l_skip_nb_bytes = 0;
 	OPJ_OFF_T l_current_skip_nb_bytes = 0;

 	assert( p_size >= 0 );

 	if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
 		p_stream->m_current_data += p_size;
 		/* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
 		which is of type OPJ_SIZE_T */
 		p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
 		l_skip_nb_bytes += p_size;
 		p_stream->m_byte_offset += l_skip_nb_bytes;
 		return l_skip_nb_bytes;
 	}

 	/* we are now in the case when the remaining data if not sufficient */
 	if (p_stream->m_status & opj_stream_e_end) {
 		l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 		p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 		p_stream->m_bytes_in_buffer = 0;
 		p_stream->m_byte_offset += l_skip_nb_bytes;
 		return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 	}

 	/* the flag is not set, we copy data and then do an actual skip on the stream */
 	if (p_stream->m_bytes_in_buffer) {
 		l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 		p_stream->m_current_data = p_stream->m_stored_data;
 		p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 		p_stream->m_bytes_in_buffer = 0;
 	}

 	while (p_size > 0) {
 		/* we should do an actual skip on the media */
 		l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 		if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
 			opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

 			p_stream->m_status |= opj_stream_e_end;
 			p_stream->m_byte_offset += l_skip_nb_bytes;
 			/* end if stream */
 			return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 		}
 		p_size -= l_current_skip_nb_bytes;
 		l_skip_nb_bytes += l_current_skip_nb_bytes;
 	}

 	p_stream->m_byte_offset += l_skip_nb_bytes;

 	return l_skip_nb_bytes;
 }

 OPJ_OFF_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	OPJ_BOOL l_is_written = 0;
 	OPJ_OFF_T l_current_skip_nb_bytes = 0;
 	OPJ_OFF_T l_skip_nb_bytes = 0;

 	if (p_stream->m_status & opj_stream_e_error) {
 		return (OPJ_OFF_T) -1;
 	}

 	/* we should flush data */
 	l_is_written = opj_stream_flush (p_stream, p_event_mgr);
 	if (! l_is_written) {
 		p_stream->m_status |= opj_stream_e_error;
 		p_stream->m_bytes_in_buffer = 0;
 		return (OPJ_OFF_T) -1;
 	}
 	/* then skip */

 	while (p_size > 0) {
 		/* we should do an actual skip on the media */
 		l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);

 		if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
 			opj_event_msg(p_event_mgr, EVT_INFO, "Stream error!\n");

 			p_stream->m_status |= opj_stream_e_error;
 			p_stream->m_byte_offset += l_skip_nb_bytes;
 			/* end if stream */
 			return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
 		}
 		p_size -= l_current_skip_nb_bytes;
 		l_skip_nb_bytes += l_current_skip_nb_bytes;
 	}

 	p_stream->m_byte_offset += l_skip_nb_bytes;

 	return l_skip_nb_bytes;
 }

 OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
 {
 	return p_stream->m_byte_offset;
 }

 OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
 {
   assert( p_stream->m_byte_offset >= 0 );
   assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
   return p_stream->m_user_data_length ?
 				(OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
 				0;
 }

 OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	assert(p_size >= 0);
 	return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
 }

 OPJ_BOOL opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	OPJ_ARG_NOT_USED(p_event_mgr);
 	p_stream->m_current_data = p_stream->m_stored_data;
 	p_stream->m_bytes_in_buffer = 0;

 	if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
 		p_stream->m_status |= opj_stream_e_end;
 		return OPJ_FALSE;
 	}
 	else {
 		/* reset stream status */
 		p_stream->m_status &= (~opj_stream_e_end);
 		p_stream->m_byte_offset = p_size;

 	}

 	return OPJ_TRUE;
 }

 OPJ_BOOL opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 {
 	if (! opj_stream_flush(p_stream,p_event_mgr)) {
 		p_stream->m_status |= opj_stream_e_error;
 		return OPJ_FALSE;
 	}

 	p_stream->m_current_data = p_stream->m_stored_data;
 	p_stream->m_bytes_in_buffer = 0;

 	if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
 		p_stream->m_status |= opj_stream_e_error;
 		return OPJ_FALSE;
 	}
 	else {
 		p_stream->m_byte_offset = p_size;
 	}

 	return OPJ_TRUE;
 }

 OPJ_BOOL opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
 {
 	assert(p_size >= 0);
 	return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
 }

 OPJ_BOOL opj_stream_has_seek (const opj_stream_private_t * p_stream)
 {
 	return p_stream->m_seek_fn != opj_stream_default_seek;
 }

 OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 {
 	OPJ_ARG_NOT_USED(p_buffer);
 	OPJ_ARG_NOT_USED(p_nb_bytes);
 	OPJ_ARG_NOT_USED(p_user_data);
 	return (OPJ_SIZE_T) -1;
 }

 OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 {
 	OPJ_ARG_NOT_USED(p_buffer);
 	OPJ_ARG_NOT_USED(p_nb_bytes);
 	OPJ_ARG_NOT_USED(p_user_data);
 	return (OPJ_SIZE_T) -1;
 }

 OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 {
 	OPJ_ARG_NOT_USED(p_nb_bytes);
 	OPJ_ARG_NOT_USED(p_user_data);
 	return (OPJ_OFF_T) -1;
 }

 OPJ_BOOL opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 {
 	OPJ_ARG_NOT_USED(p_nb_bytes);
 	OPJ_ARG_NOT_USED(p_user_data);
 	return OPJ_FALSE;
 }
	/*
	* The copyright in this software is being made available under the 2-clauses
	* BSD License, included below. This software may be subject to other third
	* party and contributor rights, including patent rights, and no such rights
	* are granted under this license.
	*
	* Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
	* Copyright (c) 2002-2014, Professor Benoit Macq
	* Copyright (c) 2001-2003, David Janssens
	* Copyright (c) 2002-2003, Yannick Verschueren
	* Copyright (c) 2003-2007, Francois-Olivier Devaux
	* Copyright (c) 2003-2014, Antonin Descampe
	* Copyright (c) 2005, Herve Drolon, FreeImage Team
	* Copyright (c) 2008, 2011-2012, Centre National d'Etudes Spatiales (CNES), FR
	* Copyright (c) 2012, CS Systemes d'Information, France
	* 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.
	*/

	#include "opj_includes.h"

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


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

	void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value)+sizeof(OPJ_UINT32)-p_nb_bytes;

	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

	memcpy(p_buffer,l_data_ptr,p_nb_bytes);
	}

	void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
	OPJ_UINT32 i;

	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

	for (i=0;i<p_nb_bytes;++i) {
	(p_buffer++) = (l_data_ptr--);
	}
	}

	void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);

	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

	*p_value = 0;
	memcpy(l_data_ptr+sizeof(OPJ_UINT32)-p_nb_bytes,p_buffer,p_nb_bytes);
	}

	void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
	OPJ_UINT32 i;

	assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));

	*p_value = 0;
	for (i=0;i<p_nb_bytes;++i) {
	(l_data_ptr--) = (p_buffer++);
	}
	}

	void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
	memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
	}

	void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
	OPJ_UINT32 i;
	for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
	(p_buffer++) = (l_data_ptr--);
	}
	}

	void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
	memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
	}

	void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
	OPJ_UINT32 i;
	for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
	(l_data_ptr--) = (p_buffer++);
	}
	}

	void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
	memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
	}

	void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
	{
	const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
	OPJ_UINT32 i;
	for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
	(p_buffer++) = (l_data_ptr--);
	}
	}

	void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
	memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
	}

	void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
	{
	OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
	OPJ_UINT32 i;
	for (i=0;i<sizeof(OPJ_FLOAT32);++i) {
	(l_data_ptr--) = (p_buffer++);
	}
	}

	opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,OPJ_BOOL l_is_input)
	{
	opj_stream_private_t * l_stream = 00;
	l_stream = (opj_stream_private_t*) opj_calloc(1,sizeof(opj_stream_private_t));
	if (! l_stream) {
	return 00;
	}

	l_stream->m_buffer_size = p_buffer_size;
	l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
	if (! l_stream->m_stored_data) {
	opj_free(l_stream);
	return 00;
	}

	l_stream->m_current_data = l_stream->m_stored_data;

	if (l_is_input) {
	l_stream->m_status \|= opj_stream_e_input;
	l_stream->m_opj_skip = opj_stream_read_skip;
	l_stream->m_opj_seek = opj_stream_read_seek;
	}
	else {
	l_stream->m_status \|= opj_stream_e_output;
	l_stream->m_opj_skip = opj_stream_write_skip;
	l_stream->m_opj_seek = opj_stream_write_seek;
	}

	l_stream->m_read_fn = opj_stream_default_read;
	l_stream->m_write_fn = opj_stream_default_write;
	l_stream->m_skip_fn = opj_stream_default_skip;
	l_stream->m_seek_fn = opj_stream_default_seek;

	return (opj_stream_t *) l_stream;
	}

	opj_stream_t* OPJ_CALLCONV opj_stream_default_create(OPJ_BOOL l_is_input)
	{
	return opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,l_is_input);
	}

	void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

	if (l_stream) {
	if (l_stream->m_free_user_data_fn) {
	l_stream->m_free_user_data_fn(l_stream->m_user_data);
	}
	opj_free(l_stream->m_stored_data);
	l_stream->m_stored_data = 00;
	opj_free(l_stream);
	}
	}

	void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

	if ((!l_stream) \|\| (! (l_stream->m_status & opj_stream_e_input))) {
	return;
	}

	l_stream->m_read_fn = p_function;
	}

	void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

	if (!l_stream) {
	return;
	}
	l_stream->m_seek_fn = p_function;
	}

	void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

	if ((!l_stream )\|\| (! (l_stream->m_status & opj_stream_e_output))) {
	return;
	}

	l_stream->m_write_fn = p_function;
	}

	void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;

	if (! l_stream) {
	return;
	}

	l_stream->m_skip_fn = p_function;
	}

	void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data, opj_stream_free_user_data_fn p_function)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
	if (!l_stream)
	return;
	l_stream->m_user_data = p_data;
	l_stream->m_free_user_data_fn = p_function;
	}

	void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
	{
	opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
	if (!l_stream)
	return;
	l_stream->m_user_data_length = data_length;
	}

	OPJ_SIZE_T opj_stream_read_data (opj_stream_private_t * p_stream,OPJ_BYTE * p_buffer, OPJ_SIZE_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	OPJ_SIZE_T l_read_nb_bytes = 0;
	if (p_stream->m_bytes_in_buffer >= p_size) {
	memcpy(p_buffer,p_stream->m_current_data,p_size);
	p_stream->m_current_data += p_size;
	p_stream->m_bytes_in_buffer -= p_size;
	l_read_nb_bytes += p_size;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
	return l_read_nb_bytes;
	}

	/* we are now in the case when the remaining data if not sufficient */
	if (p_stream->m_status & opj_stream_e_end) {
	l_read_nb_bytes += p_stream->m_bytes_in_buffer;
	memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
	p_stream->m_current_data += p_stream->m_bytes_in_buffer;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
	}

	/* the flag is not set, we copy data and then do an actual read on the stream */
	if (p_stream->m_bytes_in_buffer) {
	l_read_nb_bytes += p_stream->m_bytes_in_buffer;
	memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
	p_stream->m_current_data = p_stream->m_stored_data;
	p_buffer += p_stream->m_bytes_in_buffer;
	p_size -= p_stream->m_bytes_in_buffer;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	}
	else {
	/* case where we are already at the end of the buffer
	so reset the m_current_data to point to the start of the
	stored buffer to get ready to read from disk*/
	p_stream->m_current_data = p_stream->m_stored_data;
	}

	for (;;) {
	/* we should read less than a chunk -> read a chunk */
	if (p_size < p_stream->m_buffer_size) {
	/* we should do an actual read on the media */
	p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_stream->m_stored_data,p_stream->m_buffer_size,p_stream->m_user_data);

	if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
	/* end of stream */
	opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

	p_stream->m_bytes_in_buffer = 0;
	p_stream->m_status \|= opj_stream_e_end;
	/* end of stream */
	return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
	}
	else if (p_stream->m_bytes_in_buffer < p_size) {
	/* not enough data */
	l_read_nb_bytes += p_stream->m_bytes_in_buffer;
	memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
	p_stream->m_current_data = p_stream->m_stored_data;
	p_buffer += p_stream->m_bytes_in_buffer;
	p_size -= p_stream->m_bytes_in_buffer;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	}
	else {
	l_read_nb_bytes += p_size;
	memcpy(p_buffer,p_stream->m_current_data,p_size);
	p_stream->m_current_data += p_size;
	p_stream->m_bytes_in_buffer -= p_size;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
	return l_read_nb_bytes;
	}
	}
	else {
	/* direct read on the dest buffer */
	p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);

	if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
	/* end of stream */
	opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

	p_stream->m_bytes_in_buffer = 0;
	p_stream->m_status \|= opj_stream_e_end;
	/* end of stream */
	return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
	}
	else if (p_stream->m_bytes_in_buffer < p_size) {
	/* not enough data */
	l_read_nb_bytes += p_stream->m_bytes_in_buffer;
	p_stream->m_current_data = p_stream->m_stored_data;
	p_buffer += p_stream->m_bytes_in_buffer;
	p_size -= p_stream->m_bytes_in_buffer;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	}
	else {
	/* we have read the exact size */
	l_read_nb_bytes += p_stream->m_bytes_in_buffer;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_current_data = p_stream->m_stored_data;
	p_stream->m_bytes_in_buffer = 0;
	return l_read_nb_bytes;
	}
	}
	}
	}

	OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
	const OPJ_BYTE * p_buffer,
	OPJ_SIZE_T p_size,
	opj_event_mgr_t * p_event_mgr)
	{
	OPJ_SIZE_T l_remaining_bytes = 0;
	OPJ_SIZE_T l_write_nb_bytes = 0;

	if (p_stream->m_status & opj_stream_e_error) {
	return (OPJ_SIZE_T)-1;
	}

	for (;;) {
	l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;

	/* we have more memory than required */
	if (l_remaining_bytes >= p_size) {
	memcpy(p_stream->m_current_data, p_buffer, p_size);

	p_stream->m_current_data += p_size;
	p_stream->m_bytes_in_buffer += p_size;
	l_write_nb_bytes += p_size;
	p_stream->m_byte_offset += (OPJ_OFF_T)p_size;

	return l_write_nb_bytes;
	}

	/* we copy data and then do an actual read on the stream */
	if (l_remaining_bytes) {
	l_write_nb_bytes += l_remaining_bytes;

	memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);

	p_stream->m_current_data = p_stream->m_stored_data;

	p_buffer += l_remaining_bytes;
	p_size -= l_remaining_bytes;
	p_stream->m_bytes_in_buffer += l_remaining_bytes;
	p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
	}

	if (! opj_stream_flush(p_stream, p_event_mgr)) {
	return (OPJ_SIZE_T)-1;
	}
	}

	}

	OPJ_BOOL opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
	{
	/* the number of bytes written on the media. */
	OPJ_SIZE_T l_current_write_nb_bytes = 0;

	p_stream->m_current_data = p_stream->m_stored_data;

	while (p_stream->m_bytes_in_buffer) {
	/* we should do an actual write on the media */
	l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
	p_stream->m_bytes_in_buffer,
	p_stream->m_user_data);

	if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
	p_stream->m_status \|= opj_stream_e_error;
	opj_event_msg(p_event_mgr, EVT_INFO, "Error on writing stream!\n");

	return OPJ_FALSE;
	}

	p_stream->m_current_data += l_current_write_nb_bytes;
	p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
	}

	p_stream->m_current_data = p_stream->m_stored_data;

	return OPJ_TRUE;
	}

	OPJ_OFF_T opj_stream_read_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	OPJ_OFF_T l_skip_nb_bytes = 0;
	OPJ_OFF_T l_current_skip_nb_bytes = 0;

	assert( p_size >= 0 );

	if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
	p_stream->m_current_data += p_size;
	/* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
	which is of type OPJ_SIZE_T */
	p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
	l_skip_nb_bytes += p_size;
	p_stream->m_byte_offset += l_skip_nb_bytes;
	return l_skip_nb_bytes;
	}

	/* we are now in the case when the remaining data if not sufficient */
	if (p_stream->m_status & opj_stream_e_end) {
	l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_current_data += p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	p_stream->m_byte_offset += l_skip_nb_bytes;
	return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
	}

	/* the flag is not set, we copy data and then do an actual skip on the stream */
	if (p_stream->m_bytes_in_buffer) {
	l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_current_data = p_stream->m_stored_data;
	p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
	p_stream->m_bytes_in_buffer = 0;
	}

	while (p_size > 0) {
	/* we should do an actual skip on the media */
	l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
	if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
	opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");

	p_stream->m_status \|= opj_stream_e_end;
	p_stream->m_byte_offset += l_skip_nb_bytes;
	/* end if stream */
	return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
	}
	p_size -= l_current_skip_nb_bytes;
	l_skip_nb_bytes += l_current_skip_nb_bytes;
	}

	p_stream->m_byte_offset += l_skip_nb_bytes;

	return l_skip_nb_bytes;
	}

	OPJ_OFF_T opj_stream_write_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	OPJ_BOOL l_is_written = 0;
	OPJ_OFF_T l_current_skip_nb_bytes = 0;
	OPJ_OFF_T l_skip_nb_bytes = 0;

	if (p_stream->m_status & opj_stream_e_error) {
	return (OPJ_OFF_T) -1;
	}

	/* we should flush data */
	l_is_written = opj_stream_flush (p_stream, p_event_mgr);
	if (! l_is_written) {
	p_stream->m_status \|= opj_stream_e_error;
	p_stream->m_bytes_in_buffer = 0;
	return (OPJ_OFF_T) -1;
	}
	/* then skip */

	while (p_size > 0) {
	/* we should do an actual skip on the media */
	l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);

	if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
	opj_event_msg(p_event_mgr, EVT_INFO, "Stream error!\n");

	p_stream->m_status \|= opj_stream_e_error;
	p_stream->m_byte_offset += l_skip_nb_bytes;
	/* end if stream */
	return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
	}
	p_size -= l_current_skip_nb_bytes;
	l_skip_nb_bytes += l_current_skip_nb_bytes;
	}

	p_stream->m_byte_offset += l_skip_nb_bytes;

	return l_skip_nb_bytes;
	}

	OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
	{
	return p_stream->m_byte_offset;
	}

	OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
	{
	assert( p_stream->m_byte_offset >= 0 );
	assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
	return p_stream->m_user_data_length ?
	(OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
	0;
	}

	OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	assert(p_size >= 0);
	return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
	}

	OPJ_BOOL opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	OPJ_ARG_NOT_USED(p_event_mgr);
	p_stream->m_current_data = p_stream->m_stored_data;
	p_stream->m_bytes_in_buffer = 0;

	if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
	p_stream->m_status \|= opj_stream_e_end;
	return OPJ_FALSE;
	}
	else {
	/* reset stream status */
	p_stream->m_status &= (~opj_stream_e_end);
	p_stream->m_byte_offset = p_size;

	}

	return OPJ_TRUE;
	}

	OPJ_BOOL opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
	{
	if (! opj_stream_flush(p_stream,p_event_mgr)) {
	p_stream->m_status \|= opj_stream_e_error;
	return OPJ_FALSE;
	}

	p_stream->m_current_data = p_stream->m_stored_data;
	p_stream->m_bytes_in_buffer = 0;

	if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
	p_stream->m_status \|= opj_stream_e_error;
	return OPJ_FALSE;
	}
	else {
	p_stream->m_byte_offset = p_size;
	}

	return OPJ_TRUE;
	}

	OPJ_BOOL opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
	{
	assert(p_size >= 0);
	return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
	}

	OPJ_BOOL opj_stream_has_seek (const opj_stream_private_t * p_stream)
	{
	return p_stream->m_seek_fn != opj_stream_default_seek;
	}

	OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
	{
	OPJ_ARG_NOT_USED(p_buffer);
	OPJ_ARG_NOT_USED(p_nb_bytes);
	OPJ_ARG_NOT_USED(p_user_data);
	return (OPJ_SIZE_T) -1;
	}

	OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
	{
	OPJ_ARG_NOT_USED(p_buffer);
	OPJ_ARG_NOT_USED(p_nb_bytes);
	OPJ_ARG_NOT_USED(p_user_data);
	return (OPJ_SIZE_T) -1;
	}

	OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
	{
	OPJ_ARG_NOT_USED(p_nb_bytes);
	OPJ_ARG_NOT_USED(p_user_data);
	return (OPJ_OFF_T) -1;
	}

	OPJ_BOOL opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
	{
	OPJ_ARG_NOT_USED(p_nb_bytes);
	OPJ_ARG_NOT_USED(p_user_data);
	return OPJ_FALSE;
	}