Added stream Bencode parser

1 files changed, 104 insertions, 0 deletions

diff --git a/src/BencodeParser.h b/src/BencodeParser.h
new file mode 100644
index 00000000..eb1c4d67
--- /dev/null
+++ b/src/BencodeParser.h
@@ -0,0 +1,104 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2012 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 --> */
+#ifndef D_BENCODE_PARSER_H
+#define D_BENCODE_PARSER_H
+
+#include "common.h"
+
+#include <stack>
+
+namespace aria2 {
+
+class StructParserStateMachine;
+
+namespace bittorrent {
+
+enum BencodeError {
+  ERR_UNEXPECTED_CHAR_BEFORE_VAL = -1,
+  ERR_INVALID_NUMBER = -2,
+  ERR_NUMBER_OUT_OF_RANGE = -3,
+  ERR_PREMATURE_DATA = -4,
+  ERR_STRUCTURE_TOO_DEEP = -5,
+  ERR_INVALID_STRING_LENGTH = -6,
+  ERR_STRING_LENGTH_OUT_OF_RANGE = -7
+};
+
+class BencodeParser {
+public:
+  BencodeParser(StructParserStateMachine* psm);
+  ~BencodeParser();
+  // Parses |size| bytes of data |data| and returns the number of
+  // bytes processed. On error, one of the negative error codes is
+  // returned.
+  ssize_t parseUpdate(const char* data, size_t size);
+  // Parses |size| bytes of data |data| and returns the number of
+  // bytes processed. On error, one of the negative error codes is
+  // returned. Call this function to signal the parser that this is
+  // the last piece of data. This function does NOT reset the internal
+  // state.
+  ssize_t parseFinal(const char* data, size_t size);
+  // Resets the internal state of the parser and makes it ready for
+  // reuse.
+  void reset();
+private:
+  int pushState(int state);
+  int stateTop() const;
+  int popState();
+  void runBeginCallback(int elementType);
+  void runEndCallback(int elementType);
+  void runCharactersCallback(const char* data, size_t len);
+  void runNumberCallback(int64_t number);
+
+  void onStringEnd();
+  void onNumberEnd();
+  void onDictEnd();
+  void onListEnd();
+  void onValueEnd();
+
+  StructParserStateMachine* psm_;
+  std::stack<int> stateStack_;
+  int currentState_;
+  int64_t strLength_;
+  int numberSign_;
+  int64_t number_;
+  size_t numConsumed_;
+  int lastError_;
+};
+
+} // namespace bittorrent
+
+} // namespace aria2
+
+#endif // D_BENCODE_PARSER_H