tree 946f05317f602cb0ab588b53d35ae2d30a36813d
parent 45504666649eced0b808841d0822b2f4d17b483c
author cws1989 <cws1989@gmail.com> 1322909108 +0000
committer cws1989 <cws1989@gmail.com> 1322909108 +0000

Changes:
1. refactoring the structure
2. fill missing documentation
3. input parameter checking