[Vala] About VAPI's instance position

["????" <taozuhong qq com>]

Hi guys,


I 'm have updating the openssl.vapi file, and met a trouble about instance position. the OpenSSL api as 
follow:
 #include <openssl/rsa.h&gt;  int RSA_public_encrypt(int flen, const unsigned char *from,                     
    unsigned char *to, RSA *rsa, int padding);  int RSA_private_decrypt(int flen, const unsigned char *from,  
                        unsigned char *to, RSA *rsa, int padding);
translate to Vala vapi code as follow:
&nbsp;&nbsp;&nbsp; [Compact]
&nbsp;&nbsp;&nbsp; [CCode&nbsp;(lower_case_cprefix&nbsp;= "RSA_", cprefix&nbsp;= "RSA_", 
cheader_filename&nbsp;= "openssl/rsa.h", free_function&nbsp;= "RSA_free")]
&nbsp;&nbsp;&nbsp; public&nbsp;class RSA
&nbsp;&nbsp;&nbsp; {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public&nbsp;int&nbsp;generate_key_ex(int&nbsp;bits, BIGNUM e, 
BN_GENCB?&nbsp;cb = null);


&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [CCode&nbsp;(instance_pos = 2.1)]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public&nbsp;int&nbsp;public_encrypt(int&nbsp;flen, 
[CCode&nbsp;(array_length = false)] uint8[] from, [CCode&nbsp;(array_length = false)] uint8[] to, 
int&nbsp;padding);
&nbsp;&nbsp;&nbsp; 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; [CCode&nbsp;(instance_pos = 2.1)]
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public&nbsp;int&nbsp;private_decrypt(int&nbsp;flen, 
[CCode&nbsp;(array_length = false)] uint8[] from, [CCode&nbsp;(array_length = false)] uint8[] to, 
int&nbsp;padding);&nbsp; 
&nbsp;&nbsp;&nbsp; }




if set the instance_pos as 3, the compiler will output errors:
error: too few arguments to function 'RSA_public_encrypt'



if set the instance_pos as 2.1, the code can compile and will crashed at function public_encrypt / 
private_decrypt, 


I don't know how to set the instance_pos's value, could anybody give me some tips to fix this error?


thanks in advanced.


ZuHong Tao
2/22/2020