Added --stream-piece-selector option.

This option specifies piece selection algorithm used in HTTP/FTP
download. Piece means fixed length segment which is downloaded in
parallel in segmented download. If 'default' is given, aria2 selects
piece so that it reduces the number of establishing connection. This
is reasonable default behaviour because establishing connection is an
expensive operation.  If 'inorder' is given, aria2 selects piece which
has minimum index. Index=0 means first of the file. This will be
useful to view movie while downloading it. --enable-http-pipelining
option may be useful to reduce reconnection overhead.  Please note
that aria2 honors --min-split-size option, so it will be necessary to
specify a reasonable value to --min-split-size option.

1 files changed, 57 insertions, 0 deletions

diff --git a/src/InorderStreamPieceSelector.cc b/src/InorderStreamPieceSelector.cc
new file mode 100644
index 00000000..edb6e94e
--- /dev/null
+++ b/src/InorderStreamPieceSelector.cc
@@ -0,0 +1,57 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2011 Tatsuhiro Tsujikawa
+ *
+ * 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
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "InorderStreamPieceSelector.h"
+#include "BitfieldMan.h"
+
+namespace aria2 {
+
+InorderStreamPieceSelector::InorderStreamPieceSelector
+(BitfieldMan* bitfieldMan)
+  : bitfieldMan_(bitfieldMan)
+{}
+
+InorderStreamPieceSelector::~InorderStreamPieceSelector() {}
+
+bool InorderStreamPieceSelector::select
+(size_t& index,
+ size_t minSplitSize,
+ const unsigned char* ignoreBitfield,
+ size_t length)
+{
+  return bitfieldMan_->getInorderMissingUnusedIndex
+    (index, minSplitSize, ignoreBitfield, length);
+}
+
+} // namespace aria2