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_destroy_v3(opj_stream_t* p_stream)
 199 {
 200     opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 201
 202     if (l_stream) {
 203         FILE *fp = (FILE*)l_stream->m_user_data;
 204         if(fp)
 205             fclose(fp);
 206
 207         opj_free(l_stream->m_stored_data);
 208         l_stream->m_stored_data = 00;
 209         opj_free(l_stream);
 210     }
 211 }
 212
 213 void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
 214 {
 215         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 216
 217         if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
 218                 return;
 219         }
 220
 221         l_stream->m_read_fn = p_function;
 222 }
 223
 224 void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
 225 {
 226         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 227
 228         if (!l_stream) {
 229                 return;
 230         }
 231         l_stream->m_seek_fn = p_function;
 232 }
 233
 234 void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
 235 {
 236         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 237
 238         if ((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output))) {
 239                 return;
 240         }
 241
 242         l_stream->m_write_fn = p_function;
 243 }
 244
 245 void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
 246 {
 247         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 248
 249         if (! l_stream) {
 250                 return;
 251         }
 252
 253         l_stream->m_skip_fn = p_function;
 254 }
 255
 256 void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data)
 257 {
 258         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 259         if (!l_stream)
 260                 return;
 261         l_stream->m_user_data = p_data;
 262 }
 263
 264 void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
 265 {
 266         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 267         if (!l_stream)
 268                 return;
 269         l_stream->m_user_data_length = data_length;
 270 }
 271
 272 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)
 273 {
 274         OPJ_SIZE_T l_read_nb_bytes = 0;
 275         if (p_stream->m_bytes_in_buffer >= p_size) {
 276                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 277                 p_stream->m_current_data += p_size;
 278                 p_stream->m_bytes_in_buffer -= p_size;
 279                 l_read_nb_bytes += p_size;
 280                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 281                 return l_read_nb_bytes;
 282         }
 283
 284         /* we are now in the case when the remaining data if not sufficient */
 285         if (p_stream->m_status & opj_stream_e_end) {
 286                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 287                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 288                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 289                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 290                 p_stream->m_bytes_in_buffer = 0;
 291                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 292         }
 293
 294         /* the flag is not set, we copy data and then do an actual read on the stream */
 295         if (p_stream->m_bytes_in_buffer) {
 296                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 297                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 298                 p_stream->m_current_data = p_stream->m_stored_data;
 299                 p_buffer += p_stream->m_bytes_in_buffer;
 300                 p_size -= p_stream->m_bytes_in_buffer;
 301                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 302                 p_stream->m_bytes_in_buffer = 0;
 303         }
 304         else {
 305     /* case where we are already at the end of the buffer
 306        so reset the m_current_data to point to the start of the
 307        stored buffer to get ready to read from disk*/
 308                 p_stream->m_current_data = p_stream->m_stored_data;
 309         }
 310
 311         while(1){
 312                 /* we should read less than a chunk -> read a chunk */
 313                 if (p_size < p_stream->m_buffer_size) {
 314                         /* we should do an actual read on the media */
 315                         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);
 316
 317                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 318                                 /* end of stream */
 319                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 320
 321                                 p_stream->m_bytes_in_buffer = 0;
 322                                 p_stream->m_status |= opj_stream_e_end;
 323                                 /* end of stream */
 324                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 325                         }
 326                         else if (p_stream->m_bytes_in_buffer < p_size) {
 327                                 /* not enough data */
 328                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 329                                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 330                                 p_stream->m_current_data = p_stream->m_stored_data;
 331                                 p_buffer += p_stream->m_bytes_in_buffer;
 332                                 p_size -= p_stream->m_bytes_in_buffer;
 333                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 334                                 p_stream->m_bytes_in_buffer = 0;
 335                         }
 336                         else {
 337                                 l_read_nb_bytes += p_size;
 338                                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 339                                 p_stream->m_current_data += p_size;
 340                                 p_stream->m_bytes_in_buffer -= p_size;
 341                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 342                                 return l_read_nb_bytes;
 343                         }
 344                 }
 345                 else {
 346                         /* direct read on the dest buffer */
 347                         p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);
 348
 349                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 350                                 /*  end of stream */
 351                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 352
 353                                 p_stream->m_bytes_in_buffer = 0;
 354                                 p_stream->m_status |= opj_stream_e_end;
 355                                 /* end of stream */
 356                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 357                         }
 358                         else if (p_stream->m_bytes_in_buffer < p_size) {
 359                                 /* not enough data */
 360                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 361                                 p_stream->m_current_data = p_stream->m_stored_data;
 362                                 p_buffer += p_stream->m_bytes_in_buffer;
 363                                 p_size -= p_stream->m_bytes_in_buffer;
 364                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 365                                 p_stream->m_bytes_in_buffer = 0;
 366                         }
 367                         else {
 368                                 /* we have read the exact size */
 369                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 370                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 371                                 p_stream->m_current_data = p_stream->m_stored_data;
 372                                 p_stream->m_bytes_in_buffer = 0;
 373                                 return l_read_nb_bytes;
 374                         }
 375                 }
 376         }
 377 }
 378
 379 OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
 380                                                                   const OPJ_BYTE * p_buffer,
 381                                                                   OPJ_SIZE_T p_size,
 382                                                                   opj_event_mgr_t * p_event_mgr)
 383 {
 384         OPJ_SIZE_T l_remaining_bytes = 0;
 385         OPJ_SIZE_T l_write_nb_bytes = 0;
 386
 387         if (p_stream->m_status & opj_stream_e_error) {
 388                 return (OPJ_SIZE_T)-1;
 389         }
 390
 391         while(1) {
 392                 l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;
 393
 394                 /* we have more memory than required */
 395                 if (l_remaining_bytes >= p_size) {
 396                         memcpy(p_stream->m_current_data, p_buffer, p_size);
 397
 398                         p_stream->m_current_data += p_size;
 399                         p_stream->m_bytes_in_buffer += p_size;
 400                         l_write_nb_bytes += p_size;
 401                         p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 402
 403                         return l_write_nb_bytes;
 404                 }
 405
 406                 /* we copy data and then do an actual read on the stream */
 407                 if (l_remaining_bytes) {
 408                         l_write_nb_bytes += l_remaining_bytes;
 409
 410                         memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);
 411
 412                         p_stream->m_current_data = p_stream->m_stored_data;
 413
 414                         p_buffer += l_remaining_bytes;
 415                         p_size -= l_remaining_bytes;
 416                         p_stream->m_bytes_in_buffer += l_remaining_bytes;
 417                         p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
 418                 }
 419
 420                 if (! opj_stream_flush(p_stream, p_event_mgr)) {
 421                         return (OPJ_SIZE_T)-1;
 422                 }
 423         }
 424
 425 }
 426
 427 OPJ_BOOL opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
 428 {
 429         /* the number of bytes written on the media. */
 430         OPJ_SIZE_T l_current_write_nb_bytes = 0;
 431
 432         p_stream->m_current_data = p_stream->m_stored_data;
 433
 434         while (p_stream->m_bytes_in_buffer) {
 435                 /* we should do an actual write on the media */
 436                 l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
 437                                                                                                                 p_stream->m_bytes_in_buffer,
 438                                                                                                                 p_stream->m_user_data);
 439
 440                 if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
 441                         p_stream->m_status |= opj_stream_e_error;
 442                         opj_event_msg(p_event_mgr, EVT_INFO, "Error on writing stream!\n");
 443
 444                         return OPJ_FALSE;
 445                 }
 446
 447                 p_stream->m_current_data += l_current_write_nb_bytes;
 448                 p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
 449         }
 450
 451         p_stream->m_current_data = p_stream->m_stored_data;
 452
 453         return OPJ_TRUE;
 454 }
 455
 456 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)
 457 {
 458         OPJ_OFF_T l_skip_nb_bytes = 0;
 459         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 460
 461         assert( p_size >= 0 );
 462
 463         if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
 464                 p_stream->m_current_data += p_size;
 465                 /* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
 466                 which is of type OPJ_SIZE_T */
 467                 p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
 468                 l_skip_nb_bytes += p_size;
 469                 p_stream->m_byte_offset += l_skip_nb_bytes;
 470                 return l_skip_nb_bytes;
 471         }
 472
 473         /* we are now in the case when the remaining data if not sufficient */
 474         if (p_stream->m_status & opj_stream_e_end) {
 475                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 476                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 477                 p_stream->m_bytes_in_buffer = 0;
 478                 p_stream->m_byte_offset += l_skip_nb_bytes;
 479                 return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 480         }
 481
 482         /* the flag is not set, we copy data and then do an actual skip on the stream */
 483         if (p_stream->m_bytes_in_buffer) {
 484                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 485                 p_stream->m_current_data = p_stream->m_stored_data;
 486                 p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 487                 p_stream->m_bytes_in_buffer = 0;
 488         }
 489
 490         while (p_size > 0) {
 491                 /* we should do an actual skip on the media */
 492                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 493                 if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
 494                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 495
 496                         p_stream->m_status |= opj_stream_e_end;
 497                         p_stream->m_byte_offset += l_skip_nb_bytes;
 498                         /* end if stream */
 499                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 500                 }
 501                 p_size -= l_current_skip_nb_bytes;
 502                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 503         }
 504
 505         p_stream->m_byte_offset += l_skip_nb_bytes;
 506
 507         return l_skip_nb_bytes;
 508 }
 509
 510 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)
 511 {
 512         OPJ_BOOL l_is_written = 0;
 513         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 514         OPJ_OFF_T l_skip_nb_bytes = 0;
 515
 516         if (p_stream->m_status & opj_stream_e_error) {
 517                 return (OPJ_OFF_T) -1;
 518         }
 519
 520         /* we should flush data */
 521         l_is_written = opj_stream_flush (p_stream, p_event_mgr);
 522         if (! l_is_written) {
 523                 p_stream->m_status |= opj_stream_e_error;
 524                 p_stream->m_bytes_in_buffer = 0;
 525                 p_stream->m_current_data = p_stream->m_current_data;
 526                 return (OPJ_OFF_T) -1;
 527         }
 528         /* then skip */
 529
 530         while (p_size > 0) {
 531                 /* we should do an actual skip on the media */
 532                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 533
 534                 if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
 535                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream error!\n");
 536
 537                         p_stream->m_status |= opj_stream_e_error;
 538                         p_stream->m_byte_offset += l_skip_nb_bytes;
 539                         /* end if stream */
 540                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
 541                 }
 542                 p_size -= l_current_skip_nb_bytes;
 543                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 544         }
 545
 546         p_stream->m_byte_offset += l_skip_nb_bytes;
 547
 548         return l_skip_nb_bytes;
 549 }
 550
 551 OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
 552 {
 553         return p_stream->m_byte_offset;
 554 }
 555
 556 OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
 557 {
 558   assert( p_stream->m_byte_offset >= 0 );
 559   assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
 560   return p_stream->m_user_data_length ?
 561                                 (OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
 562                                 0;
 563 }
 564
 565 OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 566 {
 567         assert(p_size >= 0);
 568         return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
 569 }
 570
 571 OPJ_BOOL opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 572 {
 573         OPJ_ARG_NOT_USED(p_event_mgr);
 574         p_stream->m_current_data = p_stream->m_stored_data;
 575         p_stream->m_bytes_in_buffer = 0;
 576
 577         if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
 578                 p_stream->m_status |= opj_stream_e_end;
 579                 return OPJ_FALSE;
 580         }
 581         else {
 582                 /* reset stream status */
 583                 p_stream->m_status &= (~opj_stream_e_end);
 584                 p_stream->m_byte_offset = p_size;
 585
 586         }
 587
 588         return OPJ_TRUE;
 589 }
 590
 591 OPJ_BOOL opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 592 {
 593         if (! opj_stream_flush(p_stream,p_event_mgr)) {
 594                 p_stream->m_status |= opj_stream_e_error;
 595                 return OPJ_FALSE;
 596         }
 597
 598         p_stream->m_current_data = p_stream->m_stored_data;
 599         p_stream->m_bytes_in_buffer = 0;
 600
 601         if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
 602                 p_stream->m_status |= opj_stream_e_error;
 603                 return OPJ_FALSE;
 604         }
 605         else {
 606                 p_stream->m_byte_offset = p_size;
 607         }
 608
 609         return OPJ_TRUE;
 610 }
 611
 612 OPJ_BOOL opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
 613 {
 614         assert(p_size >= 0);
 615         return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
 616 }
 617
 618 OPJ_BOOL opj_stream_has_seek (const opj_stream_private_t * p_stream)
 619 {
 620         return p_stream->m_seek_fn != opj_stream_default_seek;
 621 }
 622
 623 OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 624 {
 625         OPJ_ARG_NOT_USED(p_buffer);
 626         OPJ_ARG_NOT_USED(p_nb_bytes);
 627         OPJ_ARG_NOT_USED(p_user_data);
 628         return (OPJ_SIZE_T) -1;
 629 }
 630
 631 OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 632 {
 633         OPJ_ARG_NOT_USED(p_buffer);
 634         OPJ_ARG_NOT_USED(p_nb_bytes);
 635         OPJ_ARG_NOT_USED(p_user_data);
 636         return (OPJ_SIZE_T) -1;
 637 }
 638
 639 OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 640 {
 641         OPJ_ARG_NOT_USED(p_nb_bytes);
 642         OPJ_ARG_NOT_USED(p_user_data);
 643         return (OPJ_OFF_T) -1;
 644 }
 645
 646 OPJ_BOOL opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 647 {
 648         OPJ_ARG_NOT_USED(p_nb_bytes);
 649         OPJ_ARG_NOT_USED(p_user_data);
 650         return OPJ_FALSE;
 651 }