src/lib/openjp2/cio.c

   1 /*
   2  * The copyright in this software is being made available under the 2-clauses
   3  * BSD License, included below. This software may be subject to other third
   4  * party and contributor rights, including patent rights, and no such rights
   5  * are granted under this license.
   6  *
   7  * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
   8  * Copyright (c) 2002-2014, Professor Benoit Macq
   9  * Copyright (c) 2001-2003, David Janssens
  10  * Copyright (c) 2002-2003, Yannick Verschueren
  11  * Copyright (c) 2003-2007, Francois-Olivier Devaux
  12  * Copyright (c) 2003-2014, Antonin Descampe
  13  * Copyright (c) 2005, Herve Drolon, FreeImage Team
  14  * Copyright (c) 2008, 2011-2012, Centre National d'Etudes Spatiales (CNES), FR
  15  * Copyright (c) 2012, CS Systemes d'Information, France
  16  * All rights reserved.
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions and the following disclaimer.
  23  * 2. Redistributions in binary form must reproduce the above copyright
  24  *    notice, this list of conditions and the following disclaimer in the
  25  *    documentation and/or other materials provided with the distribution.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  28  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  31  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  37  * POSSIBILITY OF SUCH DAMAGE.
  38  */
  39
  40 #include "opj_includes.h"
  41
  42 /* ----------------------------------------------------------------------- */
  43
  44
  45 /* ----------------------------------------------------------------------- */
  46
  47 void opj_write_bytes_BE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
  48 {
  49         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes;
  50
  51         assert(p_nb_bytes > 0 && p_nb_bytes <=  sizeof(OPJ_UINT32));
  52
  53         memcpy(p_buffer,l_data_ptr,p_nb_bytes);
  54 }
  55
  56 void opj_write_bytes_LE (OPJ_BYTE * p_buffer, OPJ_UINT32 p_value, OPJ_UINT32 p_nb_bytes)
  57 {
  58         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + p_nb_bytes - 1;
  59         OPJ_UINT32 i;
  60
  61         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  62
  63         for     (i=0;i<p_nb_bytes;++i) {
  64                 *(p_buffer++) = *(l_data_ptr--);
  65         }
  66 }
  67
  68 void opj_read_bytes_BE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
  69 {
  70         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
  71
  72         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  73
  74         *p_value = 0;
  75         memcpy(l_data_ptr+4-p_nb_bytes,p_buffer,p_nb_bytes);
  76 }
  77
  78 void opj_read_bytes_LE(const OPJ_BYTE * p_buffer, OPJ_UINT32 * p_value, OPJ_UINT32 p_nb_bytes)
  79 {
  80         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + p_nb_bytes-1;
  81         OPJ_UINT32 i;
  82
  83         assert(p_nb_bytes > 0 && p_nb_bytes <= sizeof(OPJ_UINT32));
  84
  85         *p_value = 0;
  86         for (i=0;i<p_nb_bytes;++i) {
  87                 *(l_data_ptr--) = *(p_buffer++);
  88         }
  89 }
  90
  91 void opj_write_double_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
  92 {
  93         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
  94         memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT64));
  95 }
  96
  97 void opj_write_double_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT64 p_value)
  98 {
  99         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT64) - 1;
 100         OPJ_UINT32 i;
 101         for     (i=0;i<sizeof(OPJ_FLOAT64);++i) {
 102                 *(p_buffer++) = *(l_data_ptr--);
 103         }
 104 }
 105
 106 void opj_read_double_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 107 {
 108         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 109         memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT64));
 110 }
 111
 112 void opj_read_double_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT64 * p_value)
 113 {
 114         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT64)-1;
 115         OPJ_UINT32 i;
 116         for (i=0;i<sizeof(OPJ_FLOAT64);++i) {
 117                 *(l_data_ptr--) = *(p_buffer++);
 118         }
 119 }
 120
 121 void opj_write_float_BE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 122 {
 123         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value);
 124         memcpy(p_buffer,l_data_ptr,sizeof(OPJ_FLOAT32));
 125 }
 126
 127 void opj_write_float_LE(OPJ_BYTE * p_buffer, OPJ_FLOAT32 p_value)
 128 {
 129         const OPJ_BYTE * l_data_ptr = ((const OPJ_BYTE *) &p_value) + sizeof(OPJ_FLOAT32) - 1;
 130         OPJ_UINT32 i;
 131         for     (i=0;i<sizeof(OPJ_FLOAT32);++i) {
 132                 *(p_buffer++) = *(l_data_ptr--);
 133         }
 134 }
 135
 136 void opj_read_float_BE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 137 {
 138         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value);
 139         memcpy(l_data_ptr,p_buffer,sizeof(OPJ_FLOAT32));
 140 }
 141
 142 void opj_read_float_LE(const OPJ_BYTE * p_buffer, OPJ_FLOAT32 * p_value)
 143 {
 144         OPJ_BYTE * l_data_ptr = ((OPJ_BYTE *) p_value) + sizeof(OPJ_FLOAT32)-1;
 145         OPJ_UINT32 i;
 146         for     (i=0;i<sizeof(OPJ_FLOAT32);++i) {
 147                 *(l_data_ptr--) = *(p_buffer++);
 148         }
 149 }
 150
 151 opj_stream_t* OPJ_CALLCONV opj_stream_create(OPJ_SIZE_T p_buffer_size,OPJ_BOOL l_is_input)
 152 {
 153         opj_stream_private_t * l_stream = 00;
 154         l_stream = (opj_stream_private_t*) opj_malloc(sizeof(opj_stream_private_t));
 155         if (! l_stream) {
 156                 return 00;
 157         }
 158
 159         memset(l_stream,0,sizeof(opj_stream_private_t));
 160         l_stream->m_buffer_size = p_buffer_size;
 161         l_stream->m_stored_data = (OPJ_BYTE *) opj_malloc(p_buffer_size);
 162         if (! l_stream->m_stored_data) {
 163                 opj_free(l_stream);
 164                 return 00;
 165         }
 166
 167         l_stream->m_current_data = l_stream->m_stored_data;
 168
 169         if (l_is_input) {
 170                 l_stream->m_status |= opj_stream_e_input;
 171                 l_stream->m_opj_skip = opj_stream_read_skip;
 172                 l_stream->m_opj_seek = opj_stream_read_seek;
 173         }
 174         else {
 175                 l_stream->m_status |= opj_stream_e_output;
 176                 l_stream->m_opj_skip = opj_stream_write_skip;
 177                 l_stream->m_opj_seek = opj_stream_write_seek;
 178         }
 179
 180         l_stream->m_read_fn = opj_stream_default_read;
 181         l_stream->m_write_fn = opj_stream_default_write;
 182         l_stream->m_skip_fn = opj_stream_default_skip;
 183         l_stream->m_seek_fn = opj_stream_default_seek;
 184
 185         return (opj_stream_t *) l_stream;
 186 }
 187
 188 opj_stream_t* OPJ_CALLCONV opj_stream_default_create(OPJ_BOOL l_is_input)
 189 {
 190         return opj_stream_create(OPJ_J2K_STREAM_CHUNK_SIZE,l_is_input);
 191 }
 192
 193 void OPJ_CALLCONV opj_stream_destroy(opj_stream_t* p_stream)
 194 {
 195         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 196
 197         if (l_stream) {
 198                 if (l_stream->m_free_user_data_fn) {
 199                         l_stream->m_free_user_data_fn(l_stream->m_user_data);
 200                 }
 201                 opj_free(l_stream->m_stored_data);
 202                 l_stream->m_stored_data = 00;
 203                 opj_free(l_stream);
 204         }
 205 }
 206
 207 void OPJ_CALLCONV opj_stream_set_read_function(opj_stream_t* p_stream, opj_stream_read_fn p_function)
 208 {
 209         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 210
 211         if ((!l_stream) || (! (l_stream->m_status & opj_stream_e_input))) {
 212                 return;
 213         }
 214
 215         l_stream->m_read_fn = p_function;
 216 }
 217
 218 void OPJ_CALLCONV opj_stream_set_seek_function(opj_stream_t* p_stream, opj_stream_seek_fn p_function)
 219 {
 220         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 221
 222         if (!l_stream) {
 223                 return;
 224         }
 225         l_stream->m_seek_fn = p_function;
 226 }
 227
 228 void OPJ_CALLCONV opj_stream_set_write_function(opj_stream_t* p_stream, opj_stream_write_fn p_function)
 229 {
 230         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 231
 232         if ((!l_stream )|| (! (l_stream->m_status & opj_stream_e_output))) {
 233                 return;
 234         }
 235
 236         l_stream->m_write_fn = p_function;
 237 }
 238
 239 void OPJ_CALLCONV opj_stream_set_skip_function(opj_stream_t* p_stream, opj_stream_skip_fn p_function)
 240 {
 241         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 242
 243         if (! l_stream) {
 244                 return;
 245         }
 246
 247         l_stream->m_skip_fn = p_function;
 248 }
 249
 250 void OPJ_CALLCONV opj_stream_set_user_data(opj_stream_t* p_stream, void * p_data, opj_stream_free_user_data_fn p_function)
 251 {
 252         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 253         if (!l_stream)
 254                 return;
 255         l_stream->m_user_data = p_data;
 256   l_stream->m_free_user_data_fn = p_function;
 257 }
 258
 259 void OPJ_CALLCONV opj_stream_set_user_data_length(opj_stream_t* p_stream, OPJ_UINT64 data_length)
 260 {
 261         opj_stream_private_t* l_stream = (opj_stream_private_t*) p_stream;
 262         if (!l_stream)
 263                 return;
 264         l_stream->m_user_data_length = data_length;
 265 }
 266
 267 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)
 268 {
 269         OPJ_SIZE_T l_read_nb_bytes = 0;
 270         if (p_stream->m_bytes_in_buffer >= p_size) {
 271                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 272                 p_stream->m_current_data += p_size;
 273                 p_stream->m_bytes_in_buffer -= p_size;
 274                 l_read_nb_bytes += p_size;
 275                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 276                 return l_read_nb_bytes;
 277         }
 278
 279         /* we are now in the case when the remaining data if not sufficient */
 280         if (p_stream->m_status & opj_stream_e_end) {
 281                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 282                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 283                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 284                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 285                 p_stream->m_bytes_in_buffer = 0;
 286                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 287         }
 288
 289         /* the flag is not set, we copy data and then do an actual read on the stream */
 290         if (p_stream->m_bytes_in_buffer) {
 291                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 292                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 293                 p_stream->m_current_data = p_stream->m_stored_data;
 294                 p_buffer += p_stream->m_bytes_in_buffer;
 295                 p_size -= p_stream->m_bytes_in_buffer;
 296                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 297                 p_stream->m_bytes_in_buffer = 0;
 298         }
 299         else {
 300     /* case where we are already at the end of the buffer
 301        so reset the m_current_data to point to the start of the
 302        stored buffer to get ready to read from disk*/
 303                 p_stream->m_current_data = p_stream->m_stored_data;
 304         }
 305
 306         while(1){
 307                 /* we should read less than a chunk -> read a chunk */
 308                 if (p_size < p_stream->m_buffer_size) {
 309                         /* we should do an actual read on the media */
 310                         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);
 311
 312                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 313                                 /* end of stream */
 314                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 315
 316                                 p_stream->m_bytes_in_buffer = 0;
 317                                 p_stream->m_status |= opj_stream_e_end;
 318                                 /* end of stream */
 319                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 320                         }
 321                         else if (p_stream->m_bytes_in_buffer < p_size) {
 322                                 /* not enough data */
 323                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 324                                 memcpy(p_buffer,p_stream->m_current_data,p_stream->m_bytes_in_buffer);
 325                                 p_stream->m_current_data = p_stream->m_stored_data;
 326                                 p_buffer += p_stream->m_bytes_in_buffer;
 327                                 p_size -= p_stream->m_bytes_in_buffer;
 328                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 329                                 p_stream->m_bytes_in_buffer = 0;
 330                         }
 331                         else {
 332                                 l_read_nb_bytes += p_size;
 333                                 memcpy(p_buffer,p_stream->m_current_data,p_size);
 334                                 p_stream->m_current_data += p_size;
 335                                 p_stream->m_bytes_in_buffer -= p_size;
 336                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 337                                 return l_read_nb_bytes;
 338                         }
 339                 }
 340                 else {
 341                         /* direct read on the dest buffer */
 342                         p_stream->m_bytes_in_buffer = p_stream->m_read_fn(p_buffer,p_size,p_stream->m_user_data);
 343
 344                         if (p_stream->m_bytes_in_buffer == (OPJ_SIZE_T)-1) {
 345                                 /*  end of stream */
 346                                 opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 347
 348                                 p_stream->m_bytes_in_buffer = 0;
 349                                 p_stream->m_status |= opj_stream_e_end;
 350                                 /* end of stream */
 351                                 return l_read_nb_bytes ? l_read_nb_bytes : (OPJ_SIZE_T)-1;
 352                         }
 353                         else if (p_stream->m_bytes_in_buffer < p_size) {
 354                                 /* not enough data */
 355                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 356                                 p_stream->m_current_data = p_stream->m_stored_data;
 357                                 p_buffer += p_stream->m_bytes_in_buffer;
 358                                 p_size -= p_stream->m_bytes_in_buffer;
 359                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 360                                 p_stream->m_bytes_in_buffer = 0;
 361                         }
 362                         else {
 363                                 /* we have read the exact size */
 364                                 l_read_nb_bytes += p_stream->m_bytes_in_buffer;
 365                                 p_stream->m_byte_offset += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 366                                 p_stream->m_current_data = p_stream->m_stored_data;
 367                                 p_stream->m_bytes_in_buffer = 0;
 368                                 return l_read_nb_bytes;
 369                         }
 370                 }
 371         }
 372 }
 373
 374 OPJ_SIZE_T opj_stream_write_data (opj_stream_private_t * p_stream,
 375                                                                   const OPJ_BYTE * p_buffer,
 376                                                                   OPJ_SIZE_T p_size,
 377                                                                   opj_event_mgr_t * p_event_mgr)
 378 {
 379         OPJ_SIZE_T l_remaining_bytes = 0;
 380         OPJ_SIZE_T l_write_nb_bytes = 0;
 381
 382         if (p_stream->m_status & opj_stream_e_error) {
 383                 return (OPJ_SIZE_T)-1;
 384         }
 385
 386         while(1) {
 387                 l_remaining_bytes = p_stream->m_buffer_size - p_stream->m_bytes_in_buffer;
 388
 389                 /* we have more memory than required */
 390                 if (l_remaining_bytes >= p_size) {
 391                         memcpy(p_stream->m_current_data, p_buffer, p_size);
 392
 393                         p_stream->m_current_data += p_size;
 394                         p_stream->m_bytes_in_buffer += p_size;
 395                         l_write_nb_bytes += p_size;
 396                         p_stream->m_byte_offset += (OPJ_OFF_T)p_size;
 397
 398                         return l_write_nb_bytes;
 399                 }
 400
 401                 /* we copy data and then do an actual read on the stream */
 402                 if (l_remaining_bytes) {
 403                         l_write_nb_bytes += l_remaining_bytes;
 404
 405                         memcpy(p_stream->m_current_data,p_buffer,l_remaining_bytes);
 406
 407                         p_stream->m_current_data = p_stream->m_stored_data;
 408
 409                         p_buffer += l_remaining_bytes;
 410                         p_size -= l_remaining_bytes;
 411                         p_stream->m_bytes_in_buffer += l_remaining_bytes;
 412                         p_stream->m_byte_offset += (OPJ_OFF_T)l_remaining_bytes;
 413                 }
 414
 415                 if (! opj_stream_flush(p_stream, p_event_mgr)) {
 416                         return (OPJ_SIZE_T)-1;
 417                 }
 418         }
 419
 420 }
 421
 422 OPJ_BOOL opj_stream_flush (opj_stream_private_t * p_stream, opj_event_mgr_t * p_event_mgr)
 423 {
 424         /* the number of bytes written on the media. */
 425         OPJ_SIZE_T l_current_write_nb_bytes = 0;
 426
 427         p_stream->m_current_data = p_stream->m_stored_data;
 428
 429         while (p_stream->m_bytes_in_buffer) {
 430                 /* we should do an actual write on the media */
 431                 l_current_write_nb_bytes = p_stream->m_write_fn(p_stream->m_current_data,
 432                                                                                                                 p_stream->m_bytes_in_buffer,
 433                                                                                                                 p_stream->m_user_data);
 434
 435                 if (l_current_write_nb_bytes == (OPJ_SIZE_T)-1) {
 436                         p_stream->m_status |= opj_stream_e_error;
 437                         opj_event_msg(p_event_mgr, EVT_INFO, "Error on writing stream!\n");
 438
 439                         return OPJ_FALSE;
 440                 }
 441
 442                 p_stream->m_current_data += l_current_write_nb_bytes;
 443                 p_stream->m_bytes_in_buffer -= l_current_write_nb_bytes;
 444         }
 445
 446         p_stream->m_current_data = p_stream->m_stored_data;
 447
 448         return OPJ_TRUE;
 449 }
 450
 451 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)
 452 {
 453         OPJ_OFF_T l_skip_nb_bytes = 0;
 454         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 455
 456         assert( p_size >= 0 );
 457
 458         if (p_stream->m_bytes_in_buffer >= (OPJ_SIZE_T)p_size) {
 459                 p_stream->m_current_data += p_size;
 460                 /* it is safe to cast p_size to OPJ_SIZE_T since it is <= m_bytes_in_buffer
 461                 which is of type OPJ_SIZE_T */
 462                 p_stream->m_bytes_in_buffer -= (OPJ_SIZE_T)p_size;
 463                 l_skip_nb_bytes += p_size;
 464                 p_stream->m_byte_offset += l_skip_nb_bytes;
 465                 return l_skip_nb_bytes;
 466         }
 467
 468         /* we are now in the case when the remaining data if not sufficient */
 469         if (p_stream->m_status & opj_stream_e_end) {
 470                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 471                 p_stream->m_current_data += p_stream->m_bytes_in_buffer;
 472                 p_stream->m_bytes_in_buffer = 0;
 473                 p_stream->m_byte_offset += l_skip_nb_bytes;
 474                 return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 475         }
 476
 477         /* the flag is not set, we copy data and then do an actual skip on the stream */
 478         if (p_stream->m_bytes_in_buffer) {
 479                 l_skip_nb_bytes += (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 480                 p_stream->m_current_data = p_stream->m_stored_data;
 481                 p_size -= (OPJ_OFF_T)p_stream->m_bytes_in_buffer;
 482                 p_stream->m_bytes_in_buffer = 0;
 483         }
 484
 485         while (p_size > 0) {
 486                 /* we should do an actual skip on the media */
 487                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 488                 if (l_current_skip_nb_bytes == (OPJ_OFF_T) -1) {
 489                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream reached its end !\n");
 490
 491                         p_stream->m_status |= opj_stream_e_end;
 492                         p_stream->m_byte_offset += l_skip_nb_bytes;
 493                         /* end if stream */
 494                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T) -1;
 495                 }
 496                 p_size -= l_current_skip_nb_bytes;
 497                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 498         }
 499
 500         p_stream->m_byte_offset += l_skip_nb_bytes;
 501
 502         return l_skip_nb_bytes;
 503 }
 504
 505 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)
 506 {
 507         OPJ_BOOL l_is_written = 0;
 508         OPJ_OFF_T l_current_skip_nb_bytes = 0;
 509         OPJ_OFF_T l_skip_nb_bytes = 0;
 510
 511         if (p_stream->m_status & opj_stream_e_error) {
 512                 return (OPJ_OFF_T) -1;
 513         }
 514
 515         /* we should flush data */
 516         l_is_written = opj_stream_flush (p_stream, p_event_mgr);
 517         if (! l_is_written) {
 518                 p_stream->m_status |= opj_stream_e_error;
 519                 p_stream->m_bytes_in_buffer = 0;
 520                 return (OPJ_OFF_T) -1;
 521         }
 522         /* then skip */
 523
 524         while (p_size > 0) {
 525                 /* we should do an actual skip on the media */
 526                 l_current_skip_nb_bytes = p_stream->m_skip_fn(p_size, p_stream->m_user_data);
 527
 528                 if (l_current_skip_nb_bytes == (OPJ_OFF_T)-1) {
 529                         opj_event_msg(p_event_mgr, EVT_INFO, "Stream error!\n");
 530
 531                         p_stream->m_status |= opj_stream_e_error;
 532                         p_stream->m_byte_offset += l_skip_nb_bytes;
 533                         /* end if stream */
 534                         return l_skip_nb_bytes ? l_skip_nb_bytes : (OPJ_OFF_T)-1;
 535                 }
 536                 p_size -= l_current_skip_nb_bytes;
 537                 l_skip_nb_bytes += l_current_skip_nb_bytes;
 538         }
 539
 540         p_stream->m_byte_offset += l_skip_nb_bytes;
 541
 542         return l_skip_nb_bytes;
 543 }
 544
 545 OPJ_OFF_T opj_stream_tell (const opj_stream_private_t * p_stream)
 546 {
 547         return p_stream->m_byte_offset;
 548 }
 549
 550 OPJ_OFF_T opj_stream_get_number_byte_left (const opj_stream_private_t * p_stream)
 551 {
 552   assert( p_stream->m_byte_offset >= 0 );
 553   assert( p_stream->m_user_data_length >= (OPJ_UINT64)p_stream->m_byte_offset);
 554   return p_stream->m_user_data_length ?
 555                                 (OPJ_OFF_T)(p_stream->m_user_data_length) - p_stream->m_byte_offset :
 556                                 0;
 557 }
 558
 559 OPJ_OFF_T opj_stream_skip (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 560 {
 561         assert(p_size >= 0);
 562         return p_stream->m_opj_skip(p_stream,p_size,p_event_mgr);
 563 }
 564
 565 OPJ_BOOL opj_stream_read_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 566 {
 567         OPJ_ARG_NOT_USED(p_event_mgr);
 568         p_stream->m_current_data = p_stream->m_stored_data;
 569         p_stream->m_bytes_in_buffer = 0;
 570
 571         if( !(p_stream->m_seek_fn(p_size,p_stream->m_user_data)) ) {
 572                 p_stream->m_status |= opj_stream_e_end;
 573                 return OPJ_FALSE;
 574         }
 575         else {
 576                 /* reset stream status */
 577                 p_stream->m_status &= (~opj_stream_e_end);
 578                 p_stream->m_byte_offset = p_size;
 579
 580         }
 581
 582         return OPJ_TRUE;
 583 }
 584
 585 OPJ_BOOL opj_stream_write_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, opj_event_mgr_t * p_event_mgr)
 586 {
 587         if (! opj_stream_flush(p_stream,p_event_mgr)) {
 588                 p_stream->m_status |= opj_stream_e_error;
 589                 return OPJ_FALSE;
 590         }
 591
 592         p_stream->m_current_data = p_stream->m_stored_data;
 593         p_stream->m_bytes_in_buffer = 0;
 594
 595         if (! p_stream->m_seek_fn(p_size,p_stream->m_user_data)) {
 596                 p_stream->m_status |= opj_stream_e_error;
 597                 return OPJ_FALSE;
 598         }
 599         else {
 600                 p_stream->m_byte_offset = p_size;
 601         }
 602
 603         return OPJ_TRUE;
 604 }
 605
 606 OPJ_BOOL opj_stream_seek (opj_stream_private_t * p_stream, OPJ_OFF_T p_size, struct opj_event_mgr * p_event_mgr)
 607 {
 608         assert(p_size >= 0);
 609         return p_stream->m_opj_seek(p_stream,p_size,p_event_mgr);
 610 }
 611
 612 OPJ_BOOL opj_stream_has_seek (const opj_stream_private_t * p_stream)
 613 {
 614         return p_stream->m_seek_fn != opj_stream_default_seek;
 615 }
 616
 617 OPJ_SIZE_T opj_stream_default_read (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 618 {
 619         OPJ_ARG_NOT_USED(p_buffer);
 620         OPJ_ARG_NOT_USED(p_nb_bytes);
 621         OPJ_ARG_NOT_USED(p_user_data);
 622         return (OPJ_SIZE_T) -1;
 623 }
 624
 625 OPJ_SIZE_T opj_stream_default_write (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void * p_user_data)
 626 {
 627         OPJ_ARG_NOT_USED(p_buffer);
 628         OPJ_ARG_NOT_USED(p_nb_bytes);
 629         OPJ_ARG_NOT_USED(p_user_data);
 630         return (OPJ_SIZE_T) -1;
 631 }
 632
 633 OPJ_OFF_T opj_stream_default_skip (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 634 {
 635         OPJ_ARG_NOT_USED(p_nb_bytes);
 636         OPJ_ARG_NOT_USED(p_user_data);
 637         return (OPJ_OFF_T) -1;
 638 }
 639
 640 OPJ_BOOL opj_stream_default_seek (OPJ_OFF_T p_nb_bytes, void * p_user_data)
 641 {
 642         OPJ_ARG_NOT_USED(p_nb_bytes);
 643         OPJ_ARG_NOT_USED(p_user_data);
 644         return OPJ_FALSE;
 645 }