Hi, what is the correct way to translate this snippet into _D2_ ?
//const and cast()

void rc2_decrypt( const unsigned short xkey[64],
                  unsigned char *plain,
                  const unsigned char *cipher )
        {
        unsigned x76, x54, x32, x10, i;

        x76 = (cipher[7] << 8) + cipher[6];
.........

many TIA, Bjoern

On Mon, 15 Dec 2008 20:11:44 +0300, BLS <nanali@nospam.wanadoo.fr> wrote:

> Hi, what is the correct way to translate this snippet into _D2_ ?
> //const and cast()
>
> void rc2_decrypt( const unsigned short xkey[64],
>                    unsigned char *plain,
>                    const unsigned char *cipher )
>          {
>          unsigned x76, x54, x32, x10, i;
>
>          x76 = (cipher[7] << 8) + cipher[6];
> .........
>
> many TIA, Bjoern

Here you go:

void rc2_decrypt( const(ushort)[64] xkey, ubyte* plain, const(ubyte)* cipher )
{
    uint x76, x54, x32, x10, i;
    x76 = (cipher[7] << 8) + cipher[6];
    // .....
}

You'd better pass cipher and plain as arrays rather than pointers if their sizes are known:

void rc2_decrypt( const(ushort)[64] xkey, const(ubyte)[] plain, const(ubyte)[] cipher )
{
    uint x76, x54, x32, x10, i;
    x76 = (cipher[7] << 8) + cipher[6];
    // .....
}

Denis Koroskin schrieb:
> On Mon, 15 Dec 2008 20:11:44 +0300, BLS <nanali@nospam.wanadoo.fr> wrote:
> 
>> Hi, what is the correct way to translate this snippet into _D2_ ?
>> //const and cast()
>>
>> void rc2_decrypt( const unsigned short xkey[64],
>>                    unsigned char *plain,
>>                    const unsigned char *cipher )
>>          {
>>          unsigned x76, x54, x32, x10, i;
>>
>>          x76 = (cipher[7] << 8) + cipher[6];
>> .........
>>
>> many TIA, Bjoern
> 
> Here you go:
> 
> void rc2_decrypt( const(ushort)[64] xkey, ubyte* plain, const(ubyte)* cipher )
> {
>     uint x76, x54, x32, x10, i;
>     x76 = (cipher[7] << 8) + cipher[6];
>     // .....
> }
> 
> You'd better pass cipher and plain as arrays rather than pointers if their sizes are known:
> 
> void rc2_decrypt( const(ushort)[64] xkey, const(ubyte)[] plain, const(ubyte)[] cipher )
> {
>     uint x76, x54, x32, x10, i;
>     x76 = (cipher[7] << 8) + cipher[6];
>     // .....
> }
Thanks a lot Denis,
I am afraid I am not able to use arrays 'cause I've to use the function as follows :
export extern(Windows) void rc2_decrypt() in order to use it from my 4GL development-system.

beside, any reason for const(ubyte)[] plain instead of ubyte[] plain ?
Bjoern