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diff --git a/src/AdaptiveFileAllocationIterator.cc b/src/AdaptiveFileAllocationIterator.cc
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+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2010 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 "AdaptiveFileAllocationIterator.h"
+#include "BinaryStream.h"
+#ifdef HAVE_FALLOCATE
+# include "FallocFileAllocationIterator.h"
+#endif // HAVE_FALLOCATE
+#include "SingleFileAllocationIterator.h"
+#include "RecoverableException.h"
+#include "LogFactory.h"
+#include "Logger.h"
+
+namespace aria2 {
+
+AdaptiveFileAllocationIterator::AdaptiveFileAllocationIterator
+(BinaryStream* stream, off_t offset, uint64_t totalLength):
+  stream_(stream), offset_(offset), totalLength_(totalLength),
+  logger_(LogFactory::getInstance()) {}
+
+AdaptiveFileAllocationIterator::~AdaptiveFileAllocationIterator() {}
+
+void AdaptiveFileAllocationIterator::allocateChunk()
+{
+  if(allocator_.isNull()) {
+#ifdef HAVE_FALLOCATE
+    try {
+      if(logger_->debug()) {
+        logger_->debug("Testing file system supports fallocate.");
+      }
+      if(static_cast<uint64_t>(offset_) < totalLength_) {
+        off_t len = std::min(totalLength_-offset_, static_cast<uint64_t>(4096));
+        stream_->allocate(offset_, len);
+        offset_ += len;
+      }
+      if(logger_->debug()) {
+        logger_->debug("File system supports fallocate.");
+      }
+      allocator_.reset
+        (new FallocFileAllocationIterator(stream_, offset_, totalLength_));
+    } catch(RecoverableException& e) {
+      if(logger_->debug()) {
+        logger_->debug("File system does not support fallocate.");
+      }
+      SharedHandle<SingleFileAllocationIterator> salloc
+        (new SingleFileAllocationIterator(stream_, offset_, totalLength_));
+      salloc->init();
+      allocator_ = salloc;
+    }
+#else // !HAVE_FALLOCATE
+    SharedHandle<SingleFileAllocationIterator> salloc
+      (new SingleFileAllocationIterator(stream_, offset_, totalLength_));
+    salloc->init();
+    allocator_ = salloc;
+#endif // !HAVE_FALLOCATE
+    allocator_->allocateChunk();
+  } else {
+    allocator_->allocateChunk();
+  }
+}
+  
+bool AdaptiveFileAllocationIterator::finished()
+{
+  if(allocator_.isNull()) {
+    return false;
+  } else {
+    return allocator_->finished();
+  }
+}
+
+} // namespace aria2