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diff --git a/src/storage/chewing_large_table.h b/src/storage/chewing_large_table.h
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+/* 
+ *  libpinyin
+ *  Library to deal with pinyin.
+ *  
+ *  Copyright (C) 2011 Peng Wu <alexepico@gmail.com>
+ *  
+ *  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.
+ */
+
+#ifndef CHEWING_LARGE_TABLE_H
+#define CHEWING_LARGE_TABLE_H
+
+
+#include <stdio.h>
+#include "novel_types.h"
+#include "memory_chunk.h"
+#include "chewing_key.h"
+
+namespace pinyin{
+
+class ChewingLengthIndexLevel;
+
+class ChewingBitmapIndexLevel{
+
+protected:
+    pinyin_option_t m_options;
+
+protected:
+    ChewingLengthIndexLevel * m_chewing_length_indexes
+    [CHEWING_NUMBER_OF_INITIALS][CHEWING_NUMBER_OF_MIDDLES]
+    [CHEWING_NUMBER_OF_FINALS][CHEWING_NUMBER_OF_TONES];
+
+    /* search functions */
+    int initial_level_search(int phrase_length,
+                             /* in */ const ChewingKey keys[],
+                             /* out */ PhraseIndexRanges ranges) const;
+
+    int middle_and_final_level_search(ChewingInitial initial,
+                                      int phrase_length,
+                                      /* in */ const ChewingKey keys[],
+                                      /* out */ PhraseIndexRanges ranges) const;
+    int tone_level_search(ChewingInitial initial, ChewingMiddle middle,
+                          ChewingFinal final, int phrase_length,
+                          /* in */ const ChewingKey keys[],
+                          /* out */ PhraseIndexRanges ranges) const;
+
+    void reset();
+
+public:
+    /* constructor/destructor */
+    ChewingBitmapIndexLevel(pinyin_option_t options);
+    ~ChewingBitmapIndexLevel() { reset(); }
+
+    /* set options method */
+    bool set_options(pinyin_option_t options) {
+        m_options = options;
+        return true;
+    }
+
+    /* load/store method */
+    bool load(MemoryChunk * chunk, table_offset_t offset, table_offset_t end);
+    bool store(MemoryChunk * new_chunk, table_offset_t offset,
+               table_offset_t & end);
+
+    /* search method */
+    int search(int phrase_length, /* in */ const ChewingKey keys[],
+               /* out */ PhraseIndexRanges ranges) const;
+
+    /* add/remove index method */
+    int add_index(int phrase_length, /* in */ const ChewingKey keys[],
+                  /* in */ phrase_token_t token);
+    int remove_index(int phrase_length, /* in */ const ChewingKey keys[],
+                     /* in */ phrase_token_t token);
+
+    /* mask out method */
+    bool mask_out(phrase_token_t mask, phrase_token_t value);
+};
+
+
+class ChewingLargeTable{
+protected:
+    ChewingBitmapIndexLevel m_bitmap_table;
+    MemoryChunk * m_chunk;
+
+    void reset(){
+        if (m_chunk) {
+            delete m_chunk; m_chunk = NULL;
+        }
+    }
+
+public:
+    /* constructor/destructor */
+    ChewingLargeTable(pinyin_option_t options):
+        m_bitmap_table(options), m_chunk(NULL) {}
+
+    ~ChewingLargeTable() { reset(); }
+
+    /* set options method */
+    bool set_options(pinyin_option_t options) {
+        return m_bitmap_table.set_options(options);
+    }
+
+    /* load/store method */
+    bool load(MemoryChunk * chunk) {
+        reset();
+        m_chunk = chunk;
+        return m_bitmap_table.load(chunk, 0, chunk->size());
+    }
+
+    bool store(MemoryChunk * new_chunk) {
+        table_offset_t end;
+        return m_bitmap_table.store(new_chunk, 0, end);
+    }
+
+    bool load_text(FILE * file);
+
+    /* search method */
+    int search(int phrase_length, /* in */ const ChewingKey keys[],
+               /* out */ PhraseIndexRanges ranges) const {
+        return m_bitmap_table.search(phrase_length, keys, ranges);
+    }
+
+    /* add/remove index method */
+    int add_index(int phrase_length, /* in */ const ChewingKey keys[],
+                  /* in */ phrase_token_t token) {
+        return m_bitmap_table.add_index(phrase_length, keys, token);
+    }
+
+    int remove_index(int phrase_length, /* in */ const ChewingKey keys[],
+                     /* in */ phrase_token_t token) {
+        return m_bitmap_table.remove_index(phrase_length, keys, token);
+    }
+
+    /* mask out method */
+    bool mask_out(phrase_token_t mask, phrase_token_t value) {
+        return m_bitmap_table.mask_out(mask, value);
+    }
+};
+
+};
+
+#endif