write PhraseTableEntry::mask_out method

1 files changed, 25 insertions, 0 deletions

diff --git a/src/storage/phrase_large_table3.cpp b/src/storage/phrase_large_table3.cpp
index 6587b75..f89f166 100644
--- a/src/storage/phrase_large_table3.cpp
+++ b/src/storage/phrase_large_table3.cpp
@@ -122,6 +122,31 @@ int PhraseTableEntry::get_length() const {
     return begin - end;
 }
 
+/* mask out method */
+
+bool PhraseTableEntry::mask_out(phrase_token_t mask, phrase_token_t value) {
+    const char * content = (char *) m_chunk.begin() +
+        sizeof(table_entry_header_t);
+    const phrase_token_t * begin = (phrase_token_t *) content;
+    const phrase_token_t * end = (phrase_token_t *) m_chunk.end();
+
+    const phrase_token_t * cur_token;
+    for (cur_token = begin; cur_token != end; ++cur_token) {
+        if ((*cur_token & mask) != value)
+            continue;
+
+        int offset = sizeof(table_entry_header_t) /* header */ +
+            (cur_token - begin) * sizeof(phrase_token_t);
+        m_chunk.remove_content(offset, sizeof(phrase_token_t));
+
+        /* update chunk end. */
+        end = (phrase_token_t *) m_chunk.end();
+        --cur_token;
+    }
+
+    return true;
+}
+
 
 /* load text method */