--- /dev/null
+/*****************************************************************************
+ * rar.c: uncompressed RAR stream filter (only the biggest file is extracted)
+ *****************************************************************************
+ * Copyright (C) 2008 Laurent Aimar
+ * $Id$
+ *
+ * Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+/*****************************************************************************
+ * Preamble
+ *****************************************************************************/
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_stream.h>
+
+#include <assert.h>
+#include <limits.h>
+
+/*****************************************************************************
+ * Module descriptor
+ *****************************************************************************/
+static int Open ( vlc_object_t * );
+static void Close( vlc_object_t * );
+
+vlc_module_begin()
+ set_category( CAT_INPUT )
+ set_subcategory( SUBCAT_INPUT_STREAM_FILTER )
+ set_description( N_("Uncompressed RAR") )
+ set_capability( "stream_filter", 1 )
+ set_callbacks( Open, Close )
+vlc_module_end()
+
+/*****************************************************************************
+ *
+ *****************************************************************************/
+static const uint8_t p_rar_marker[] = {
+ 0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00
+};
+static const int i_rar_marker = sizeof(p_rar_marker);
+
+typedef struct
+{
+ int64_t i_offset;
+ int64_t i_size;
+ int64_t i_cummulated_size;
+} rar_file_chunk_t;
+typedef struct
+{
+ char *psz_name;
+ int64_t i_size;
+ bool b_complete;
+
+ int i_chunk;
+ rar_file_chunk_t **pp_chunk;
+ int64_t i_real_size; /* Gathered size */
+} rar_file_t;
+
+static void RarFileDelete( rar_file_t * );
+
+struct stream_sys_t
+{
+ rar_file_t *p_file;
+ const rar_file_chunk_t *p_chunk;
+
+ int64_t i_position;
+
+ uint8_t *p_peek_alloc;
+ uint8_t *p_peek;
+ unsigned int i_peek;
+};
+
+
+/****************************************************************************
+ * Local prototypes
+ ****************************************************************************/
+static int Read ( stream_t *, void *p_read, unsigned int i_read );
+static int Peek ( stream_t *, const uint8_t **pp_peek, unsigned int i_peek );
+static int Control( stream_t *, int i_query, va_list );
+
+static int Parse ( stream_t * );
+static int Seek ( stream_t *s, int64_t i_position );
+
+/****************************************************************************
+ * Open
+ ****************************************************************************/
+static int Open ( vlc_object_t *p_this )
+{
+ stream_t *s = (stream_t*)p_this;
+ stream_sys_t *p_sys;
+
+ /* */
+ const uint8_t *p_peek;
+ if( stream_Peek( s->p_source, &p_peek, i_rar_marker ) < i_rar_marker )
+ return VLC_EGENERIC;
+ if( memcmp( p_peek, p_rar_marker, i_rar_marker ) )
+ return VLC_EGENERIC;
+
+ /* */
+ s->pf_read = Read;
+ s->pf_peek = Peek;
+ s->pf_control = Control;
+
+ s->p_sys = p_sys = malloc( sizeof( *p_sys ) );
+ if( !p_sys )
+ return VLC_ENOMEM;
+
+ /* */
+ p_sys->p_file = NULL;
+ p_sys->i_position = 0;
+ p_sys->p_chunk = NULL;
+
+ p_sys->p_peek_alloc = NULL;
+ p_sys->p_peek = NULL;
+ p_sys->i_peek = 0;
+
+ /* */
+ if( Parse( s ) || !p_sys->p_file || p_sys->p_file->i_chunk <= 0 )
+ {
+ msg_Err( s, "Invalid or unsupported RAR archive" );
+ if( p_sys->p_file )
+ RarFileDelete( p_sys->p_file );
+ free( p_sys );
+ return VLC_EGENERIC;
+ }
+
+ /* */
+ Seek( s, 0 );
+
+ /* */
+ const rar_file_t *p_file = p_sys->p_file;
+ msg_Dbg( s, "Using RAR stream filter for '%s' %lld(expected %lld) bytes in %d chunks",
+ p_file->psz_name, p_file->i_real_size, p_file->i_size, p_file->i_chunk );
+
+ return VLC_SUCCESS;
+}
+
+/****************************************************************************
+ * Close
+ ****************************************************************************/
+static void Close( vlc_object_t *p_this )
+{
+ stream_t *s = (stream_t*)p_this;
+ stream_sys_t *p_sys = s->p_sys;
+
+ RarFileDelete( p_sys->p_file );
+ free( p_sys->p_peek_alloc );
+ free( p_sys );
+}
+
+/****************************************************************************
+ * Stream filters functions
+ ****************************************************************************/
+static int Read( stream_t *s, void *p_read, unsigned int i_read )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ uint8_t *p_data = p_read;
+ unsigned int i_total = 0;
+
+ if( p_sys->i_peek > 0 && i_read > 0 )
+ {
+ const unsigned int i_copy = __MIN( i_read, p_sys->i_peek );
+
+ if( p_data )
+ {
+ memcpy( p_data, p_sys->p_peek, i_copy );
+ p_data += i_copy;
+ }
+
+ p_sys->i_peek -= i_copy;
+ p_sys->p_peek += i_copy;
+ i_total += i_copy;
+ }
+
+ while( i_total < i_read )
+ {
+ const int64_t i_chunk_end = p_sys->p_chunk->i_cummulated_size + p_sys->p_chunk->i_size;
+
+ int i_max = __MIN( i_read - i_total, i_chunk_end - p_sys->i_position );
+ if( i_max <= 0 )
+ break;
+
+ int i_real = stream_Read( s->p_source, p_data, i_max );
+ if( i_real <= 0 )
+ break;
+
+ i_total += i_real;
+ if( p_data )
+ p_data += i_real;
+ p_sys->i_position += i_real;
+ if( p_sys->i_position >= i_chunk_end )
+ {
+ if( Seek( s, p_sys->i_position ) )
+ break;
+ }
+ }
+ return i_total;
+}
+
+static int Peek( stream_t *s, const uint8_t **pp_peek, unsigned int i_peek )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ if( i_peek <= p_sys->i_peek )
+ {
+ *pp_peek = p_sys->p_peek;
+ return i_peek;
+ }
+
+ /* */
+ uint8_t *p_peek = malloc( i_peek );
+ if( !p_peek )
+ return 0;
+
+ /* XXX yes stream_Read on ourself */
+ int i_read = stream_Read( s, p_peek, i_peek );
+ if( i_read <= 0 )
+ {
+ free( p_peek );
+ return i_read;
+ }
+
+ if( p_sys->p_peek_alloc )
+ free( p_sys->p_peek_alloc );
+
+ p_sys->p_peek_alloc =
+ p_sys->p_peek = p_peek;
+ p_sys->i_peek = i_read;
+
+ *pp_peek = p_sys->p_peek;
+ return p_sys->i_peek;
+}
+
+static int Control( stream_t *s, int i_query, va_list args )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ switch( i_query )
+ {
+ /* */
+ case STREAM_SET_POSITION:
+ {
+ int64_t i_position = (int64_t)va_arg( args, int64_t );
+ return Seek( s, i_position );
+ }
+
+ case STREAM_GET_POSITION:
+ {
+ int64_t *pi_position = (int64_t*)va_arg( args, int64_t* );
+ *pi_position = p_sys->i_position - p_sys->i_peek;
+ return VLC_SUCCESS;
+ }
+
+ case STREAM_GET_SIZE:
+ {
+ int64_t *pi_size = (int64_t*)va_arg( args, int64_t* );
+ *pi_size = p_sys->p_file->i_real_size;
+ return VLC_SUCCESS;
+ }
+
+ case STREAM_GET_MTU:
+ {
+ int *pi_mtu = (int*)va_arg( args, int* );
+ *pi_mtu = 0;
+ return VLC_SUCCESS;
+ }
+
+ /* */
+ case STREAM_GET_CONTENT_TYPE: /* arg1= char ** */
+ return VLC_EGENERIC;
+
+ case STREAM_UPDATE_SIZE: /* TODO maybe we should update i_real_size from file size and chunk offset ? */
+ case STREAM_CONTROL_ACCESS:
+ case STREAM_CAN_SEEK:
+ case STREAM_CAN_FASTSEEK:
+ case STREAM_SET_RECORD_STATE:
+ return stream_vaControl( s->p_source, i_query, args );
+ default:
+ return VLC_EGENERIC;
+ }
+}
+
+/****************************************************************************
+ * Helpers
+ ****************************************************************************/
+static int Seek( stream_t *s, int64_t i_position )
+{
+ stream_sys_t *p_sys = s->p_sys;
+
+ if( i_position < 0 )
+ i_position = 0;
+ else if( i_position > p_sys->p_file->i_real_size )
+ i_position = p_sys->p_file->i_real_size;
+
+ /* Search the chunk */
+ const rar_file_t *p_file = p_sys->p_file;
+ for( int i = 0; i < p_file->i_chunk; i++ )
+ {
+ p_sys->p_chunk = p_file->pp_chunk[i];
+ if( i_position < p_sys->p_chunk->i_cummulated_size + p_sys->p_chunk->i_size )
+ break;
+ }
+ p_sys->i_position = i_position;
+ p_sys->i_peek = 0;
+
+ const int64_t i_seek = p_sys->p_chunk->i_offset +
+ ( i_position - p_sys->p_chunk->i_cummulated_size );
+ return stream_Seek( s->p_source, i_seek );
+}
+
+static void RarFileDelete( rar_file_t *p_file )
+{
+ for( int i = 0; i < p_file->i_chunk; i++ )
+ free( p_file->pp_chunk[i] );
+ free( p_file->pp_chunk );
+ free( p_file->psz_name );
+ free( p_file );
+}
+
+typedef struct
+{
+ uint16_t i_crc;
+ uint8_t i_type;
+ uint16_t i_flags;
+ uint16_t i_size;
+ uint32_t i_add_size;
+} rar_block_t;
+
+enum
+{
+ RAR_BLOCK_MARKER = 0x72,
+ RAR_BLOCK_ARCHIVE = 0x73,
+ RAR_BLOCK_FILE = 0x74,
+ RAR_BLOCK_END = 0x7b,
+};
+enum
+{
+ RAR_BLOCK_END_HAS_NEXT = 0x0001,
+};
+enum
+{
+ RAR_BLOCK_FILE_HAS_PREVIOUS = 0x0001,
+ RAR_BLOCK_FILE_HAS_NEXT = 0x0002,
+ RAR_BLOCK_FILE_HAS_HIGH = 0x0100,
+};
+
+static int PeekBlock( stream_t *s, rar_block_t *p_hdr )
+{
+ const uint8_t *p_peek;
+ int i_peek = stream_Peek( s->p_source, &p_peek, 11 );
+
+ if( i_peek < 7 )
+ return VLC_EGENERIC;
+
+ p_hdr->i_crc = GetWLE( &p_peek[0] );
+ p_hdr->i_type = p_peek[2];
+ p_hdr->i_flags = GetWLE( &p_peek[3] );
+ p_hdr->i_size = GetWLE( &p_peek[5] );
+ p_hdr->i_add_size = 0;
+ if( p_hdr->i_flags & 0x8000 )
+ {
+ if( i_peek < 11 )
+ return VLC_EGENERIC;
+ p_hdr->i_add_size = GetDWLE( &p_peek[7] );
+ }
+
+ if( p_hdr->i_size < 7 )
+ return VLC_EGENERIC;
+ return VLC_SUCCESS;
+}
+static int SkipBlock( stream_t *s, const rar_block_t *p_hdr )
+{
+ int64_t i_size = (int64_t)p_hdr->i_size + p_hdr->i_add_size;
+
+ assert( i_size >= 0 );
+ while( i_size > 0 )
+ {
+ int i_skip = __MIN( i_size, INT_MAX );
+ if( stream_Read( s->p_source, NULL, i_skip ) < i_skip )
+ return VLC_EGENERIC;
+
+ i_size -= i_skip;
+ }
+ return VLC_SUCCESS;
+}
+
+static int IgnoreBlock( stream_t *s, int i_block )
+{
+ /* */
+ rar_block_t bk;
+ if( PeekBlock( s, &bk ) || bk.i_type != i_block )
+ return VLC_EGENERIC;
+ return SkipBlock( s, &bk );
+}
+
+static int SkipEnd( stream_t *s, const rar_block_t *p_hdr )
+{
+ if( !(p_hdr->i_flags & RAR_BLOCK_END_HAS_NEXT) )
+ return VLC_EGENERIC;
+
+ if( SkipBlock( s, p_hdr ) )
+ return VLC_EGENERIC;
+
+ /* Now, we need to look for a marker block,
+ * It seems that there is garbage at EOF */
+ for( ;; )
+ {
+ const uint8_t *p_peek;
+
+ if( stream_Peek( s->p_source, &p_peek, i_rar_marker ) < i_rar_marker )
+ return VLC_EGENERIC;
+
+ if( !memcmp( p_peek, p_rar_marker, i_rar_marker ) )
+ break;
+
+ if( stream_Read( s->p_source, NULL, 1 ) != 1 )
+ return VLC_EGENERIC;
+ }
+
+ /* Skip marker and archive blocks */
+ if( IgnoreBlock( s, RAR_BLOCK_MARKER ) )
+ return VLC_EGENERIC;
+ if( IgnoreBlock( s, RAR_BLOCK_ARCHIVE ) )
+ return VLC_EGENERIC;
+
+ return VLC_SUCCESS;
+}
+
+static int SkipFile( stream_t *s,const rar_block_t *p_hdr )
+{
+ stream_sys_t *p_sys = s->p_sys;
+ const uint8_t *p_peek;
+
+ if( stream_Peek( s->p_source, &p_peek, p_hdr->i_size ) < p_hdr->i_size )
+ return VLC_EGENERIC;
+
+ int i_min_size = 7+21;
+ if( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH )
+ i_min_size += 8;
+ if( p_hdr->i_size < i_min_size )
+ return VLC_EGENERIC;
+
+ /* */
+ uint32_t i_file_size_low = GetDWLE( &p_peek[7+4] );
+ uint8_t i_method = p_peek[7+18];
+ uint16_t i_name_size = GetWLE( &p_peek[7+19] );
+ uint32_t i_file_size_high = 0;
+ if( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH )
+ i_file_size_high = GetDWLE( &p_peek[7+25] );
+
+ char *psz_name = calloc( 1, i_name_size + 1 );
+ if( !psz_name )
+ return VLC_EGENERIC;
+
+ const int i_name_offset = (p_hdr->i_flags & RAR_BLOCK_FILE_HAS_HIGH) ? (7+33) : (7+25);
+ if( i_name_offset + i_name_size <= p_hdr->i_size )
+ memcpy( psz_name, &p_peek[i_name_offset], i_name_size );
+
+ if( i_method != 0x30 )
+ {
+ msg_Warn( s, "Ignoring compressed file %s (method=0x%2.2x)", psz_name, i_method );
+ goto exit;
+ }
+
+ /* Ignore smaller files */
+ const int64_t i_file_size = ((int64_t)i_file_size_high << 32) | i_file_size_low;
+ if( p_sys->p_file &&
+ p_sys->p_file->i_size < i_file_size )
+ {
+ RarFileDelete( p_sys->p_file );
+ p_sys->p_file = NULL;
+ }
+ /* */
+ rar_file_t *p_current = p_sys->p_file;
+ if( !p_current )
+ {
+ p_sys->p_file = p_current = malloc( sizeof( *p_sys->p_file ) );
+ if( !p_current )
+ goto exit;
+
+ /* */
+ p_current->psz_name = psz_name;
+ p_current->i_size = i_file_size;
+ p_current->b_complete = false;
+ p_current->i_real_size = 0;
+ TAB_INIT( p_current->i_chunk, p_current->pp_chunk );
+
+ psz_name = NULL;
+ }
+
+ /* Append chunks */
+ if( !p_current->b_complete )
+ {
+ bool b_append = false;
+ /* Append if first chunk */
+ if( p_current->i_chunk <= 0 )
+ b_append = true;
+ /* Append if it is really a continuous chunck */
+ if( p_current->i_size == i_file_size &&
+ ( !psz_name || !strcmp( p_current->psz_name, psz_name ) ) &&
+ ( p_hdr->i_flags & RAR_BLOCK_FILE_HAS_PREVIOUS ) )
+ b_append = true;
+
+ if( b_append )
+ {
+ rar_file_chunk_t *p_chunk = malloc( sizeof( *p_chunk ) );
+ if( p_chunk )
+ {
+ p_chunk->i_offset = stream_Tell( s->p_source );
+ p_chunk->i_size = p_hdr->i_add_size;
+ p_chunk->i_cummulated_size = 0;
+ if( p_current->i_chunk > 0 )
+ {
+ rar_file_chunk_t *p_previous = p_current->pp_chunk[p_current->i_chunk-1];
+
+ p_chunk->i_cummulated_size += p_previous->i_cummulated_size +
+ p_previous->i_size;
+ }
+
+ TAB_APPEND( p_current->i_chunk, p_current->pp_chunk, p_chunk );
+
+ p_current->i_real_size += p_hdr->i_add_size;
+ }
+ }
+
+ if( !(p_hdr->i_flags & RAR_BLOCK_FILE_HAS_NEXT ) )
+ p_current->b_complete = true;
+ }
+
+exit:
+ /* */
+ free( psz_name );
+
+ /* We stop on the first non empty file if we cannot seek */
+ if( p_sys->p_file )
+ {
+ bool b_can_seek = false;
+ stream_Control( s->p_source, STREAM_CAN_SEEK, &b_can_seek );
+ if( !b_can_seek && p_current->i_size > 0 )
+ return VLC_EGENERIC;
+ }
+
+ if( SkipBlock( s, p_hdr ) )
+ return VLC_EGENERIC;
+ return VLC_SUCCESS;
+}
+
+static int Parse( stream_t *s )
+{
+ /* Skip marker */
+ if( IgnoreBlock( s, RAR_BLOCK_MARKER ) )
+ return VLC_EGENERIC;
+
+ /* Skip archive */
+ if( IgnoreBlock( s, RAR_BLOCK_ARCHIVE ) )
+ return VLC_EGENERIC;
+
+ /* */
+ for( ;; )
+ {
+ rar_block_t bk;
+ int i_ret;
+
+ if( PeekBlock( s, &bk ) )
+ break;
+
+ switch( bk.i_type )
+ {
+ case RAR_BLOCK_END:
+ i_ret = SkipEnd( s, &bk );
+ break;
+ case RAR_BLOCK_FILE:
+ i_ret = SkipFile( s, &bk );
+ break;
+ default:
+ i_ret = SkipBlock( s, &bk );
+ break;
+ }
+ if( i_ret )
+ break;
+ }
+
+ return VLC_SUCCESS;
+}
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