1 /*****************************************************************************
2 * rar.c: uncompressed RAR stream filter (only the biggest file is extracted)
3 *****************************************************************************
4 * Copyright (C) 2008 Laurent Aimar
7 * Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
33 #include <vlc_stream.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Open ( vlc_object_t * );
42 static void Close( vlc_object_t * );
45 set_category( CAT_INPUT )
46 set_subcategory( SUBCAT_INPUT_STREAM_FILTER )
47 set_description( N_("Uncompressed RAR") )
48 set_capability( "stream_filter", 1 )
49 set_callbacks( Open, Close )
53 /*****************************************************************************
55 *****************************************************************************/
56 static const uint8_t p_rar_marker[] = {
57 0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00
59 static const int i_rar_marker = sizeof(p_rar_marker);
65 uint64_t i_cummulated_size;
74 rar_file_chunk_t **pp_chunk;
75 uint64_t i_real_size; /* Gathered size */
78 static void RarFileDelete( rar_file_t * );
79 static int RarParse( stream_t *, int *pi_count, rar_file_t ***ppp_file );
84 const rar_file_chunk_t *p_chunk;
88 uint8_t *p_peek_alloc;
94 /****************************************************************************
96 ****************************************************************************/
97 static int Read ( stream_t *, void *p_read, unsigned int i_read );
98 static int Peek ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
99 static int Control( stream_t *, int i_query, va_list );
100 static int Seek ( stream_t *s, uint64_t i_position );
102 /****************************************************************************
104 ****************************************************************************/
105 static int Open ( vlc_object_t *p_this )
107 stream_t *s = (stream_t*)p_this;
111 const uint8_t *p_peek;
112 if( stream_Peek( s->p_source, &p_peek, i_rar_marker ) < i_rar_marker )
114 if( memcmp( p_peek, p_rar_marker, i_rar_marker ) )
120 s->pf_control = Control;
122 s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
127 p_sys->p_file = NULL;
128 p_sys->i_position = 0;
129 p_sys->p_chunk = NULL;
131 p_sys->p_peek_alloc = NULL;
132 p_sys->p_peek = NULL;
137 rar_file_t **pp_file;
138 if( RarParse( s, &i_count, &pp_file ) )
144 /* Select the longest file */
145 p_sys->p_file = NULL;
146 for( int i = 0; i < i_count; i++ )
148 if( !p_sys->p_file || p_sys->p_file->i_size < pp_file[i]->i_size )
149 p_sys->p_file = pp_file[i];
151 for( int i = 0; i < i_count; i++ )
153 if( pp_file[i] != p_sys->p_file )
154 RarFileDelete( pp_file[i] );
158 if( !p_sys->p_file || p_sys->p_file->i_chunk <= 0 || p_sys->p_file->i_size <= 0 )
160 msg_Err( s, "Invalid or unsupported RAR archive" );
162 RarFileDelete( p_sys->p_file );
171 const rar_file_t *p_file = p_sys->p_file;
172 msg_Dbg( s, "Using RAR stream filter for '%s' %"PRId64"(expected %"PRId64") bytes in %d chunks",
173 p_file->psz_name, p_file->i_real_size, p_file->i_size, p_file->i_chunk );
178 /****************************************************************************
180 ****************************************************************************/
181 static void Close( vlc_object_t *p_this )
183 stream_t *s = (stream_t*)p_this;
184 stream_sys_t *p_sys = s->p_sys;
186 RarFileDelete( p_sys->p_file );
187 free( p_sys->p_peek_alloc );
191 /****************************************************************************
192 * Stream filters functions
193 ****************************************************************************/
194 static int Read( stream_t *s, void *p_read, unsigned int i_read )
196 stream_sys_t *p_sys = s->p_sys;
197 uint8_t *p_data = p_read;
198 unsigned int i_total = 0;
200 if( p_sys->i_peek > 0 && i_read > 0 )
202 const unsigned int i_copy = __MIN( i_read, p_sys->i_peek );
206 memcpy( p_data, p_sys->p_peek, i_copy );
210 p_sys->i_peek -= i_copy;
211 p_sys->p_peek += i_copy;
215 while( i_total < i_read )
217 const uint64_t i_chunk_end = p_sys->p_chunk->i_cummulated_size + p_sys->p_chunk->i_size;
219 int i_max = __MIN( i_read - i_total, i_chunk_end - p_sys->i_position );
223 int i_real = stream_Read( s->p_source, p_data, i_max );
230 p_sys->i_position += i_real;
231 if( p_sys->i_position >= i_chunk_end )
233 if( Seek( s, p_sys->i_position ) )
240 static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
242 stream_sys_t *p_sys = s->p_sys;
244 if( i_peek <= p_sys->i_peek )
246 *pp_peek = p_sys->p_peek;
251 uint8_t *p_peek = malloc( i_peek );
255 /* XXX yes stream_Read on ourself */
256 int i_read = stream_Read( s, p_peek, i_peek );
263 free( p_sys->p_peek_alloc );
265 p_sys->p_peek_alloc =
266 p_sys->p_peek = p_peek;
267 p_sys->i_peek = i_read;
269 *pp_peek = p_sys->p_peek;
270 return p_sys->i_peek;
273 static int Control( stream_t *s, int i_query, va_list args )
275 stream_sys_t *p_sys = s->p_sys;
280 case STREAM_SET_POSITION:
282 uint64_t i_position = va_arg( args, uint64_t );
283 return Seek( s, i_position );
286 case STREAM_GET_POSITION:
288 uint64_t *pi_position = va_arg( args, uint64_t* );
289 *pi_position = p_sys->i_position - p_sys->i_peek;
293 case STREAM_GET_SIZE:
295 uint64_t *pi_size = (uint64_t*)va_arg( args, uint64_t* );
296 *pi_size = p_sys->p_file->i_real_size;
301 case STREAM_GET_CONTENT_TYPE: /* arg1= char ** */
304 case STREAM_UPDATE_SIZE: /* TODO maybe we should update i_real_size from file size and chunk offset ? */
305 case STREAM_CONTROL_ACCESS:
306 case STREAM_CAN_SEEK:
307 case STREAM_CAN_FASTSEEK:
308 case STREAM_SET_RECORD_STATE:
309 return stream_vaControl( s->p_source, i_query, args );
315 /****************************************************************************
317 ****************************************************************************/
318 static int Seek( stream_t *s, uint64_t i_position )
320 stream_sys_t *p_sys = s->p_sys;
322 if( i_position > p_sys->p_file->i_real_size )
323 i_position = p_sys->p_file->i_real_size;
325 /* Search the chunk */
326 const rar_file_t *p_file = p_sys->p_file;
327 for( int i = 0; i < p_file->i_chunk; i++ )
329 p_sys->p_chunk = p_file->pp_chunk[i];
330 if( i_position < p_sys->p_chunk->i_cummulated_size + p_sys->p_chunk->i_size )
333 p_sys->i_position = i_position;
336 const uint64_t i_seek = p_sys->p_chunk->i_offset +
337 ( i_position - p_sys->p_chunk->i_cummulated_size );
338 return stream_Seek( s->p_source, i_seek );
342 static void RarFileDelete( rar_file_t *p_file )
344 for( int i = 0; i < p_file->i_chunk; i++ )
345 free( p_file->pp_chunk[i] );
346 free( p_file->pp_chunk );
347 free( p_file->psz_name );
362 RAR_BLOCK_MARKER = 0x72,
363 RAR_BLOCK_ARCHIVE = 0x73,
364 RAR_BLOCK_FILE = 0x74,
365 RAR_BLOCK_END = 0x7b,
369 RAR_BLOCK_END_HAS_NEXT = 0x0001,
373 RAR_BLOCK_FILE_HAS_PREVIOUS = 0x0001,
374 RAR_BLOCK_FILE_HAS_NEXT = 0x0002,
375 RAR_BLOCK_FILE_HAS_HIGH = 0x0100,
378 static int PeekBlock( stream_t *s, rar_block_t *p_hdr )
380 const uint8_t *p_peek;
381 int i_peek = stream_Peek( s->p_source, &p_peek, 11 );
386 p_hdr->i_crc = GetWLE( &p_peek[0] );
387 p_hdr->i_type = p_peek[2];
388 p_hdr->i_flags = GetWLE( &p_peek[3] );
389 p_hdr->i_size = GetWLE( &p_peek[5] );
390 p_hdr->i_add_size = 0;
391 if( p_hdr->i_flags & 0x8000 )
395 p_hdr->i_add_size = GetDWLE( &p_peek[7] );
398 if( p_hdr->i_size < 7 )
402 static int SkipBlock( stream_t *s, const rar_block_t *p_hdr )
404 uint64_t i_size = (uint64_t)p_hdr->i_size + p_hdr->i_add_size;
408 int i_skip = __MIN( i_size, INT_MAX );
409 if( stream_Read( s->p_source, NULL, i_skip ) < i_skip )
417 static int IgnoreBlock( stream_t *s, int i_block )
421 if( PeekBlock( s, &bk ) || bk.i_type != i_block )
423 return SkipBlock( s, &bk );
426 static int SkipEnd( stream_t *s, const rar_block_t *p_hdr )
428 if( !(p_hdr->i_flags & RAR_BLOCK_END_HAS_NEXT) )
431 if( SkipBlock( s, p_hdr ) )
434 /* Now, we need to look for a marker block,
435 * It seems that there is garbage at EOF */
438 const uint8_t *p_peek;
440 if( stream_Peek( s->p_source, &p_peek, i_rar_marker ) < i_rar_marker )
443 if( !memcmp( p_peek, p_rar_marker, i_rar_marker ) )
446 if( stream_Read( s->p_source, NULL, 1 ) != 1 )
450 /* Skip marker and archive blocks */
451 if( IgnoreBlock( s, RAR_BLOCK_MARKER ) )
453 if( IgnoreBlock( s, RAR_BLOCK_ARCHIVE ) )
459 static int SkipFile( stream_t *s, int *pi_count, rar_file_t ***ppp_file, const rar_block_t *p_hdr )
461 const uint8_t *p_peek;
463 int i_min_size = 7+21;
464 if( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH )
466 if( p_hdr->i_size < (unsigned)i_min_size )
469 if( stream_Peek( s->p_source, &p_peek, i_min_size ) < i_min_size )
473 uint32_t i_file_size_low = GetDWLE( &p_peek[7+4] );
474 uint8_t i_method = p_peek[7+18];
475 uint16_t i_name_size = GetWLE( &p_peek[7+19] );
476 uint32_t i_file_size_high = 0;
477 if( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH )
478 i_file_size_high = GetDWLE( &p_peek[7+25] );
479 const uint64_t i_file_size = ((uint64_t)i_file_size_high << 32) | i_file_size_low;
481 char *psz_name = calloc( 1, i_name_size + 1 );
485 const int i_name_offset = (p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH) ? (7+33) : (7+25);
486 if( i_name_offset + i_name_size <= p_hdr->i_size )
488 const int i_max_size = i_name_offset + i_name_size;
489 if( stream_Peek( s->p_source, &p_peek, i_max_size ) < i_max_size )
494 memcpy( psz_name, &p_peek[i_name_offset], i_name_size );
497 if( i_method != 0x30 )
499 msg_Warn( s, "Ignoring compressed file %s (method=0x%2.2x)", psz_name, i_method );
504 rar_file_t *p_current = *pi_count > 0 ? (*ppp_file)[*pi_count - 1] : NULL;
506 ( p_current->b_complete ||
507 p_current->i_size != i_file_size ||
508 strcmp( p_current->psz_name, psz_name ) ||
509 ( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_PREVIOUS ) == 0 ) )
514 p_current = malloc( sizeof( *p_current ) );
517 TAB_APPEND( *pi_count, *ppp_file, p_current );
519 p_current->psz_name = psz_name;
520 p_current->i_size = i_file_size;
521 p_current->b_complete = false;
522 p_current->i_real_size = 0;
523 TAB_INIT( p_current->i_chunk, p_current->pp_chunk );
529 rar_file_chunk_t *p_chunk = malloc( sizeof( *p_chunk ) );
532 p_chunk->i_offset = stream_Tell( s->p_source ) + p_hdr->i_size;
533 p_chunk->i_size = p_hdr->i_add_size;
534 p_chunk->i_cummulated_size = 0;
535 if( p_current->i_chunk > 0 )
537 rar_file_chunk_t *p_previous = p_current->pp_chunk[p_current->i_chunk-1];
539 p_chunk->i_cummulated_size += p_previous->i_cummulated_size +
543 TAB_APPEND( p_current->i_chunk, p_current->pp_chunk, p_chunk );
545 p_current->i_real_size += p_hdr->i_add_size;
547 if( ( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_NEXT ) == 0 )
548 p_current->b_complete = true;
554 /* We stop on the first non empty file if we cannot seek */
557 bool b_can_seek = false;
558 stream_Control( s->p_source, STREAM_CAN_SEEK, &b_can_seek );
559 if( !b_can_seek && p_current->i_size > 0 )
563 if( SkipBlock( s, p_hdr ) )
568 static int RarParse( stream_t *s, int *pi_count, rar_file_t ***ppp_file )
574 if( IgnoreBlock( s, RAR_BLOCK_MARKER ) )
578 if( IgnoreBlock( s, RAR_BLOCK_ARCHIVE ) )
587 if( PeekBlock( s, &bk ) )
593 i_ret = SkipEnd( s, &bk );
596 i_ret = SkipFile( s, pi_count, ppp_file, &bk );
599 i_ret = SkipBlock( s, &bk );