enum {GB2312, UTF_8};

char * base64_decode(const char *str, size_t *size);
char * quoted_printable_decode(const char *str, size_t *size);
void utf82gb(char *gb,const char *utf8);
void strip_html(char *s);
int get_charset(char *charset);
char *unmime_header(const char *encoded_str, int default_charset);
extern char *strstr_nocase(const char *s1, const char *s2);