C# :- P/invoke signature

Question

I have a dll with following signature in C++. It is working in c++;

    void Decompress(unsigned char *in,int in_len,unsigned char * out,
unsigned *o_len,int *e);

Description of parameter

1. *in : It is byte array passed to fucntion.
2. in_len : Length of bytes in first parameter.
3. *out : This would be the output as byte array.
4. *o_len : No of bytes in third parameter
5. *e : Error code returned

How can i call it from c#?

What would be the P/Invoke declration?

Answer 1

static extern void Decompress(
                byte[] input, 
                int in_len,
                byte[] output, 
                ref int o_len,
                out int e);