src/lib/openjp2/cio.c

   1 /*
   2  * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
   3  * Copyright (c) 2002-2007, Professor Benoit Macq
   4  * Copyright (c) 2001-2003, David Janssens
   5  * Copyright (c) 2002-2003, Yannick Verschueren
   6  * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
   7  * Copyright (c) 2005, Herve Drolon, FreeImage Team
   8  * Copyright (c) 2008;2011-2012, Centre National d'Etudes Spatiales (CNES), France
   9  * Copyright (c) 2012, CS Systemes d'Information, France
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  31  * POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include "opj_includes.h"
  35
  36 /* ----------------------------------------------------------------------- */
  37
  38
  39 /* ----------------------------------------------------------------------- */
  40
  41 void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
  42 {
  43         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes;
  44
  45         assert(p_nb_bytes > 0 && p_nb_bytes <=  sizeof(OPJ_UINT32));
  46
  47         memcpy(p_buffer,l_data_ptr,p_nb_bytes);
  48 }
  49
  50 void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
  51 {
  52         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
  53         OPJ_UINT32 i;
  54
  55         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  56
  57         for     (i=0;i<p_nb_bytes;++i) {
  58                 *(p_buffer++) = *(l_data_ptr--);
  59         }
  60 }
  61
  62 void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
  63 {
  64         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
  65
  66         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  67
  68         *p_value = 0;
  69         memcpy(l_data_ptr+4-p_nb_bytes,p_buffer,p_nb_bytes);
  70 }
  71
  72 void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
  73 {
  74         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
  75         OPJ_UINT32 i;
  76
  77         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  78
  79         *p_value = 0;
  80         for (i=0;i<p_nb_bytes;++i) {
  81                 *(l_data_ptr--) = *(p_buffer++);
  82         }
  83 }
  84
  85 void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
  86 {
  87         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
  88         memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
  89 }
  90
  91 void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
  92 {
  93         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
  94         OPJ_UINT32 i;
  95         for     (i=0;i<sizeof(OPJ_FLOAT64);++i) {
  96                 *(p_buffer++) = *(l_data_ptr--);
  97         }
  98 }
  99
 100 void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 101 {
 102         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 103         memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
 104 }
 105
 106 void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 107 {
 108         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
 109         OPJ_UINT32 i;
 110         for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
 111                 *(l_data_ptr--) = *(p_buffer++);
 112         }
 113 }
 114
 115 void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 116 {
 117         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
 118         memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
 119 }
 120
 121 void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 122 {
 123         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
 124         OPJ_UINT32 i;
 125         for     (i=0;i<sizeof(OPJ_FLOAT32);++i) {
 126                 *(p_buffer++) = *(l_data_ptr--);
 127         }
 128 }
 129
 130 void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 131 {
 132         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 133         memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
 134 }
 135
 136 void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 137 {
 138         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
 139         OPJ_UINT32 i;
 140         for     (i=0;i<sizeof(OPJ_FLOAT32);++i) {
 141                 *(l_data_ptr--) = *(p_buffer++);
 142         }
 143 }
 144
 145 opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,OPJ_BOOL l_is_input)
 146 {
 147         opj_stream_private_t * l_stream = 00;
 148         l_stream = (opj_stream_private_t*) opj_malloc(sizeof(opj_stream_private_t));
 149         if (! l_stream) {
 150                 return 00;
 151         }
 152
 153         memset(l_stream,0,sizeof(opj_stream_private_t));
 154         l_stream->m_buffer_size = p_buffer_size;
 155         l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
 156         if (! l_stream->m_stored_data) {
 157                 opj_free(l_stream);
 158                 return 00;
 159         }
 160
 161         l_stream->m_current_data = l_stream->m_stored_data;
 162
 163         if (l_is_input) {
 164                 l_stream->m_status |= opj_stream_e_input;
 165                 l_stream->m_opj_skip = opj_stream_read_skip;
 166                 l_stream->m_opj_seek = opj_stream_read_seek;
 167         }
 168         else {
 169                 l_stream->m_status |= opj_stream_e_output;
 170                 l_stream->m_opj_skip = opj_stream_write_skip;
 171                 l_stream->m_opj_seek = opj_stream_write_seek;
 172         }
 173
 174         l_stream->m_read_fn = opj_stream_default_read;
 175         l_stream->m_write_fn = opj_stream_default_write;
 176         l_stream->m_skip_fn = opj_stream_default_skip;
 177         l_stream->m_seek_fn = opj_stream_default_seek;
 178
 179         return (opj_stream_t *) l_stream;
 180 }
 181
 182 opj_stream_t* OPJ_CALLCONV opj_stream_default_create(OPJ_BOOL l_is_input)
 183 {
 184         return opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,l_is_input);
 185 }
 186
 187 void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
 188 {
 189         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 190
 191         if (l_stream) {
 192                 opj_free(l_stream->m_stored_data);
 193                 l_stream->m_stored_data = 00;
 194                 opj_free(l_stream);
 195         }
 196 }
 197
 198 void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
 199 {
 200         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 201
 202         if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
 203                 return;
 204         }
 205
 206         l_stream->m_read_fn = p_function;
 207 }
 208
 209 void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
 210 {
 211         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 212
 213         if (!l_stream) {
 214                 return;
 215         }
 216         l_stream->m_seek_fn = p_function;
 217 }
 218
 219 void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
 220 {
 221         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 222
 223         if ((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output))) {
 224                 return;
 225         }
 226
 227         l_stream->m_write_fn = p_function;
 228 }
 229
 230 void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
 231 {
 232         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 233
 234         if (! l_stream) {
 235                 return;
 236         }
 237
 238         l_stream->m_skip_fn = p_function;
 239 }
 240
 241 void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data)
 242 {
 243         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 244         l_stream->m_user_data = p_data;
 245 }
 246
 247 void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
 248 {
 249         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 250         l_stream->m_user_data_length = data_length;
 251 }
 252
 253 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)
 254 {
 255         OPJ_SIZE_T l_read_nb_bytes = 0;
 256         if (p_stream->m_bytes_in_buffer >= p_size) {
 257                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 258                 p_stream->m_current_data += p_size;
 259                 p_stream->m_bytes_in_buffer -= p_size;
 260                 l_read_nb_bytes += p_size;
 261                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 262                 return l_read_nb_bytes;
 263         }
 264
 265         /* we are now in the case when the remaining data if not sufficient */
 266         if (p_stream->m_status & opj_stream_e_end) {
 267                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 268                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 269                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 270                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 271                 p_stream->m_bytes_in_buffer = 0;
 272                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 273         }
 274
 275         /* the flag is not set, we copy data and then do an actual read on the stream */
 276         if (p_stream->m_bytes_in_buffer) {
 277                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 278                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 279                 p_stream->m_current_data = p_stream->m_stored_data;
 280                 p_buffer += p_stream->m_bytes_in_buffer;
 281                 p_size -= p_stream->m_bytes_in_buffer;
 282                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 283                 p_stream->m_bytes_in_buffer = 0;
 284         }
 285         else {
 286     /* case where we are already at the end of the buffer
 287        so reset the m_current_data to point to the start of the
 288        stored buffer to get ready to read from disk*/
 289                 p_stream->m_current_data = p_stream->m_stored_data;
 290         }
 291
 292         while(1){
 293                 /* we should read less than a chunk -> read a chunk */
 294                 if (p_size < p_stream->m_buffer_size) {
 295                         /* we should do an actual read on the media */
 296                         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);
 297
 298                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 299                                 /* end of stream */
 300                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 301
 302                                 p_stream->m_bytes_in_buffer = 0;
 303                                 p_stream->m_status |= opj_stream_e_end;
 304                                 /* end of stream */
 305                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 306                         }
 307                         else if (p_stream->m_bytes_in_buffer < p_size) {
 308                                 /* not enough data */
 309                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 310                                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 311                                 p_stream->m_current_data = p_stream->m_stored_data;
 312                                 p_buffer += p_stream->m_bytes_in_buffer;
 313                                 p_size -= p_stream->m_bytes_in_buffer;
 314                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 315                                 p_stream->m_bytes_in_buffer = 0;
 316                         }
 317                         else {
 318                                 l_read_nb_bytes += p_size;
 319                                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 320                                 p_stream->m_current_data += p_size;
 321                                 p_stream->m_bytes_in_buffer -= p_size;
 322                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 323                                 return l_read_nb_bytes;
 324                         }
 325                 }
 326                 else {
 327                         /* direct read on the dest buffer */
 328                         p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);
 329
 330                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 331                                 /*  end of stream */
 332                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 333
 334                                 p_stream->m_bytes_in_buffer = 0;
 335                                 p_stream->m_status |= opj_stream_e_end;
 336                                 /* end of stream */
 337                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 338                         }
 339                         else if (p_stream->m_bytes_in_buffer < p_size) {
 340                                 /* not enough data */
 341                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 342                                 p_stream->m_current_data = p_stream->m_stored_data;
 343                                 p_buffer += p_stream->m_bytes_in_buffer;
 344                                 p_size -= p_stream->m_bytes_in_buffer;
 345                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 346                                 p_stream->m_bytes_in_buffer = 0;
 347                         }
 348                         else {
 349                                 /* we have read the exact size */
 350                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 351                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 352                                 p_stream->m_current_data = p_stream->m_stored_data;
 353                                 p_stream->m_bytes_in_buffer = 0;
 354                                 return l_read_nb_bytes;
 355                         }
 356                 }
 357         }
 358 }
 359
 360 OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
 361                                                                   const OPJ_BYTE * p_buffer,
 362                                                                   OPJ_SIZE_T p_size,
 363                                                                   opj_event_mgr_t * p_event_mgr)
 364 {
 365         OPJ_SIZE_T l_remaining_bytes = 0;
 366         OPJ_SIZE_T l_write_nb_bytes = 0;
 367
 368         if (p_stream->m_status & opj_stream_e_error) {
 369                 return (OPJ_SIZE_T)-1;
 370         }
 371
 372         while(1) {
 373                 l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;
 374
 375                 /* we have more memory than required */
 376                 if (l_remaining_bytes >= p_size) {
 377                         memcpy(p_stream->m_current_data, p_buffer, p_size);
 378
 379                         p_stream->m_current_data += p_size;
 380                         p_stream->m_bytes_in_buffer += p_size;
 381                         l_write_nb_bytes += p_size;
 382                         p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 383
 384                         return l_write_nb_bytes;
 385                 }
 386
 387                 /* we copy data and then do an actual read on the stream */
 388                 if (l_remaining_bytes) {
 389                         l_write_nb_bytes += l_remaining_bytes;
 390
 391                         memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);
 392
 393                         p_stream->m_current_data = p_stream->m_stored_data;
 394
 395                         p_buffer += l_remaining_bytes;
 396                         p_size -= l_remaining_bytes;
 397                         p_stream->m_bytes_in_buffer += l_remaining_bytes;
 398                         p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
 399                 }
 400
 401                 if (! opj_stream_flush(p_stream, p_event_mgr)) {
 402                         return (OPJ_SIZE_T)-1;
 403                 }
 404         }
 405
 406 }
 407
 408 OPJ_BOOL opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
 409 {
 410         /* the number of bytes written on the media. */
 411         OPJ_SIZE_T l_current_write_nb_bytes = 0;
 412
 413         p_stream->m_current_data = p_stream->m_stored_data;
 414
 415         while (p_stream->m_bytes_in_buffer) {
 416                 /* we should do an actual write on the media */
 417                 l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
 418                                                                                                                 p_stream->m_bytes_in_buffer,
 419                                                                                                                 p_stream->m_user_data);
 420
 421                 if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
 422                         p_stream->m_status |= opj_stream_e_error;
 423                         opj_event_msg(p_event_mgr, EVT_INFO, "Error on writing stream!\n");
 424
 425                         return OPJ_FALSE;
 426                 }
 427
 428                 p_stream->m_current_data += l_current_write_nb_bytes;
 429                 p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
 430         }
 431
 432         p_stream->m_current_data = p_stream->m_stored_data;
 433
 434         return OPJ_TRUE;
 435 }
 436
 437 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)
 438 {
 439         OPJ_OFF_T l_skip_nb_bytes = 0;
 440         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 441
 442         assert( p_size >= 0 );
 443
 444         if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
 445                 p_stream->m_current_data += p_size;
 446                 /* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
 447                 which is of type OPJ_SIZE_T */
 448                 p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
 449                 l_skip_nb_bytes += p_size;
 450                 p_stream->m_byte_offset += l_skip_nb_bytes;
 451                 return l_skip_nb_bytes;
 452         }
 453
 454         /* we are now in the case when the remaining data if not sufficient */
 455         if (p_stream->m_status & opj_stream_e_end) {
 456                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 457                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 458                 p_stream->m_bytes_in_buffer = 0;
 459                 p_stream->m_byte_offset += l_skip_nb_bytes;
 460                 return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 461         }
 462
 463         /* the flag is not set, we copy data and then do an actual skip on the stream */
 464         if (p_stream->m_bytes_in_buffer) {
 465                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 466                 p_stream->m_current_data = p_stream->m_stored_data;
 467                 p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 468                 p_stream->m_bytes_in_buffer = 0;
 469         }
 470
 471         while (p_size > 0) {
 472                 /* we should do an actual skip on the media */
 473                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 474                 if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
 475                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 476
 477                         p_stream->m_status |= opj_stream_e_end;
 478                         p_stream->m_byte_offset += l_skip_nb_bytes;
 479                         /* end if stream */
 480                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 481                 }
 482                 p_size -= l_current_skip_nb_bytes;
 483                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 484         }
 485
 486         p_stream->m_byte_offset += l_skip_nb_bytes;
 487
 488         return l_skip_nb_bytes;
 489 }
 490
 491 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)
 492 {
 493         OPJ_BOOL l_is_written = 0;
 494         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 495         OPJ_OFF_T l_skip_nb_bytes = 0;
 496
 497         if (p_stream->m_status & opj_stream_e_error) {
 498                 return (OPJ_OFF_T) -1;
 499         }
 500
 501         /* we should flush data */
 502         l_is_written = opj_stream_flush (p_stream, p_event_mgr);
 503         if (! l_is_written) {
 504                 p_stream->m_status |= opj_stream_e_error;
 505                 p_stream->m_bytes_in_buffer = 0;
 506                 p_stream->m_current_data = p_stream->m_current_data;
 507                 return (OPJ_OFF_T) -1;
 508         }
 509         /* then skip */
 510
 511         while (p_size > 0) {
 512                 /* we should do an actual skip on the media */
 513                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 514
 515                 if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
 516                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream error!\n");
 517
 518                         p_stream->m_status |= opj_stream_e_error;
 519                         p_stream->m_byte_offset += l_skip_nb_bytes;
 520                         /* end if stream */
 521                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
 522                 }
 523                 p_size -= l_current_skip_nb_bytes;
 524                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 525         }
 526
 527         p_stream->m_byte_offset += l_skip_nb_bytes;
 528
 529         return l_skip_nb_bytes;
 530 }
 531
 532 OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
 533 {
 534         return p_stream->m_byte_offset;
 535 }
 536
 537 OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
 538 {
 539   assert( p_stream->m_byte_offset >= 0 );
 540   assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
 541   return p_stream->m_user_data_length ?
 542                                 (OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
 543                                 0;
 544 }
 545
 546 OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 547 {
 548         assert(p_size >= 0);
 549         return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
 550 }
 551
 552 OPJ_BOOL opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 553 {
 554         OPJ_ARG_NOT_USED(p_event_mgr);
 555         p_stream->m_current_data = p_stream->m_stored_data;
 556         p_stream->m_bytes_in_buffer = 0;
 557
 558         if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
 559                 p_stream->m_status |= opj_stream_e_end;
 560                 return OPJ_FALSE;
 561         }
 562         else {
 563                 /* reset stream status */
 564                 p_stream->m_status &= (~opj_stream_e_end);
 565                 p_stream->m_byte_offset = p_size;
 566
 567         }
 568
 569         return OPJ_TRUE;
 570 }
 571
 572 OPJ_BOOL opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 573 {
 574         if (! opj_stream_flush(p_stream,p_event_mgr)) {
 575                 p_stream->m_status |= opj_stream_e_error;
 576                 return OPJ_FALSE;
 577         }
 578
 579         p_stream->m_current_data = p_stream->m_stored_data;
 580         p_stream->m_bytes_in_buffer = 0;
 581
 582         if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
 583                 p_stream->m_status |= opj_stream_e_error;
 584                 return OPJ_FALSE;
 585         }
 586         else {
 587                 p_stream->m_byte_offset = p_size;
 588         }
 589
 590         return OPJ_TRUE;
 591 }
 592
 593 OPJ_BOOL opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
 594 {
 595         assert(p_size >= 0);
 596         return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
 597 }
 598
 599 OPJ_BOOL opj_stream_has_seek (const opj_stream_private_t * p_stream)
 600 {
 601         return p_stream->m_seek_fn != opj_stream_default_seek;
 602 }
 603
 604 OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 605 {
 606         OPJ_ARG_NOT_USED(p_buffer);
 607         OPJ_ARG_NOT_USED(p_nb_bytes);
 608         OPJ_ARG_NOT_USED(p_user_data);
 609         return (OPJ_SIZE_T) -1;
 610 }
 611
 612 OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 613 {
 614         OPJ_ARG_NOT_USED(p_buffer);
 615         OPJ_ARG_NOT_USED(p_nb_bytes);
 616         OPJ_ARG_NOT_USED(p_user_data);
 617         return (OPJ_SIZE_T) -1;
 618 }
 619
 620 OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 621 {
 622         OPJ_ARG_NOT_USED(p_nb_bytes);
 623         OPJ_ARG_NOT_USED(p_user_data);
 624         return (OPJ_OFF_T) -1;
 625 }
 626
 627 OPJ_BOOL opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 628 {
 629         OPJ_ARG_NOT_USED(p_nb_bytes);
 630         OPJ_ARG_NOT_USED(p_user_data);
 631         return OPJ_FALSE;
 632 }