基本思路很简单，就用两个大数组：

UTF8 ->GBK

先从UTF8中解读出unicode值，再从数组中读出GBK值。



GBK->UTF8

直接以GBK的值为下标，查找数组中对应的UTF8值。



现在解决的问题：

1.可从UTF8转换到GBK编码

2.可对UTF8的编码格式作出判断，如某个UTF8不合要求或字节数不足，会自动跳过。

3.可从GBK编码转换到UTF8编码



未完成的问题：

1.计算字符串长度

2.在调用函数给要分配一定的缓存空间，如分配的空间不够大，会产生core down-Basic idea is simple, with two large arrays: UTF8->　GBK start with UTF8 in the Interpretation of the unicode value, and then read from the array GBK value. GBK->　UTF8 directly to the value of subscr ipt GBK, UTF8 find the corresponding array value. Now solve the problem: 1. Can be converted to the GBK encoding from UTF8 2. UTF8 encoding format can make judgments, such as a UTF8 deficient or insufficient number of bytes will be automatically skipped. 3. Transcoding from GBK to UTF8 encoding outstanding issues: 1. Calculate the string length 2. In the calling function to allocate a certain cache to space, such as allocation of space is not big enough, will have core down