dvdread: Don't ignore errors from UDFReadBlocks

Fixes https://github.com/HandBrake/HandBrake/issues/535

(cherry picked from commit d95c6c272d277f4d507c82d5a909f42566cfbb66)

diff --git a/contrib/libdvdread/A01-UDFReadBlocks-errors.patch b/contrib/libdvdread/A01-UDFReadBlocks-errors.patch
new file mode 100644 (file)
index 0000000..98edbe3
--- /dev/null
+++ b/contrib/libdvdread/A01-UDFReadBlocks-errors.patch
@@ -0,0 +1,162 @@
+diff --git a/src/dvd_reader.c b/src/dvd_reader.c
+index 4e112d3..e8d50f3 100644
+--- a/src/dvd_reader.c
++++ b/src/dvd_reader.c
+@@ -1156,13 +1156,13 @@ int InternalUDFReadBlocksRaw( const dvd_reader_t *device, uint32_t lb_number,
+ 
+   if( !device->dev ) {
+     fprintf( stderr, "libdvdread: Fatal error in block read.\n" );
+-    return 0;
++    return -1;
+   }
+ 
+   ret = dvdinput_seek( device->dev, (int) lb_number );
+   if( ret != (int) lb_number ) {
+     fprintf( stderr, "libdvdread: Can't seek to block %u\n", lb_number );
+-    return 0;
++    return ret;
+   }
+ 
+   ret = dvdinput_read( device->dev, (char *) data,
+diff --git a/src/dvd_udf.c b/src/dvd_udf.c
+index 5eb3d2b..68c3a9a 100644
+--- a/src/dvd_udf.c
++++ b/src/dvd_udf.c
+@@ -516,6 +516,7 @@ static int UDFMapICB( dvd_reader_t *device, struct AD ICB, uint8_t *FileType,
+   uint32_t lbnum;
+   uint16_t TagID;
+   struct icbmap tmpmap;
++  int ret;
+ 
+   lbnum = partition->Start + ICB.Location;
+   tmpmap.lbn = lbnum;
+@@ -526,10 +527,16 @@ static int UDFMapICB( dvd_reader_t *device, struct AD ICB, uint8_t *FileType,
+   }
+ 
+   do {
+-    if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 )
++    ret = DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 );
++    if( ret < 0 ) {
++      return ret;
++    }
++    else if( ret == 0 ) {
+       TagID = 0;
+-    else
++    }
++    else {
+       UDFDescriptor( LogBlock, &TagID );
++    }
+ 
+     if( TagID == FileEntry ) {
+       UDFFileEntry( LogBlock, FileType, partition, File );
+@@ -677,6 +688,7 @@ static int UDFGetAVDP( dvd_reader_t *device,
+   uint32_t lastsector;
+   int terminate;
+   struct avdp_t;
++  int ret;
+ 
+   if(GetUDFCache(device, AVDPCache, 0, avdp))
+     return 1;
+@@ -687,11 +699,16 @@ static int UDFGetAVDP( dvd_reader_t *device,
+   terminate = 0;
+ 
+   for(;;) {
+-    if( DVDReadLBUDF( device, lbnum, 1, Anchor, 0 ) > 0 ) {
+-      UDFDescriptor( Anchor, &TagID );
+-    } else {
++    ret = DVDReadLBUDF( device, lbnum, 1, Anchor, 0 );
++    if( ret < 0 ) {
++      return ret;
++    }
++    else if( ret == 0 ) {
+       TagID = 0;
+     }
++    else {
++      UDFDescriptor( Anchor, &TagID );
++    }
+     if (TagID != AnchorVolumeDescriptorPointer) {
+       /* Not an anchor */
+       if( terminate ) return 0; /* Final try failed */
+@@ -742,7 +759,7 @@ static int UDFFindPartition( dvd_reader_t *device, int partnum,
+   uint8_t *LogBlock = (uint8_t *)(((uintptr_t)LogBlock_base & ~((uintptr_t)2047)) + 2048);
+   uint32_t lbnum, MVDS_location, MVDS_length;
+   uint16_t TagID;
+-  int i, volvalid;
++  int i, volvalid, ret;
+   struct avdp_t avdp;
+ 
+   if(!UDFGetAVDP(device, &avdp))
+@@ -761,10 +778,16 @@ static int UDFFindPartition( dvd_reader_t *device, int partnum,
+     lbnum = MVDS_location;
+     do {
+ 
+-      if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 )
++      ret = DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 );
++      if( ret < 0 ) {
++        return ret;
++      }
++      else if( ret == 0 ) {
+         TagID = 0;
+-      else
++      }
++      else {
+         UDFDescriptor( LogBlock, &TagID );
++      }
+ 
+       if( ( TagID == PartitionDescriptor ) && ( !part->valid ) ) {
+         /* Partition Descriptor */
+@@ -805,6 +828,7 @@ uint32_t UDFFindFile( dvd_reader_t *device, const char *filename,
+   struct AD RootICB, File, ICB;
+   char tokenline[ MAX_UDF_FILE_NAME_LEN ];
+   uint8_t filetype;
++  int ret;
+ 
+   *filesize = 0;
+   tokenline[0] = '\0';
+@@ -820,10 +844,16 @@ uint32_t UDFFindFile( dvd_reader_t *device, const char *filename,
+     /* Find root dir ICB */
+     lbnum = partition.Start;
+     do {
+-      if( DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 ) <= 0 )
++      ret = DVDReadLBUDF( device, lbnum++, 1, LogBlock, 0 );
++      if( ret < 0 ) {
++        return ret;
++      }
++      else if( ret == 0 ) {
+         TagID = 0;
+-      else
++      }
++      else {
+         UDFDescriptor( LogBlock, &TagID );
++      }
+ 
+       /* File Set Descriptor */
+       if( TagID == FileSetDescriptor )  /* File Set Descriptor */
+@@ -886,7 +916,7 @@ static int UDFGetDescriptor( dvd_reader_t *device, int id,
+   uint32_t lbnum, MVDS_location, MVDS_length;
+   struct avdp_t avdp;
+   uint16_t TagID;
+-  int i, desc_found = 0;
++  int i, desc_found = 0, ret;
+   /* Find Anchor */
+   lbnum = 256;   /* Try #1, prime anchor */
+   if(bufsize < DVD_VIDEO_LB_LEN)
+@@ -904,10 +934,16 @@ static int UDFGetDescriptor( dvd_reader_t *device, int id,
+     /* Find  Descriptor */
+     lbnum = MVDS_location;
+     do {
+-      if( DVDReadLBUDF( device, lbnum++, 1, descriptor, 0 ) <= 0 )
++      ret = DVDReadLBUDF( device, lbnum++, 1, descriptor, 0 );
++      if( ret < 0 ) {
++        return ret;
++      }
++      else if( ret == 0 ) {
+         TagID = 0;
+-      else
++      }
++      else {
+         UDFDescriptor( descriptor, &TagID );
++      }
+       if( (TagID == id) && ( !desc_found ) )
+         /* Descriptor */
+         desc_found = 1;