How to code such function, thanks for any comments

[yezi]

HI :

The following code is
typedef struct nlpPkt
{
int source:4;
int destin:4;
unsigned int control:1;
unsigned int contype:5;
int length:10;
int checksum:16;
char nlpData[1500];
} NLPPKT; //same size

typedef struct tlpPkt
{
int sequence:7;
int ack:8;
int lenghth:10;
int blankbit:5;
int End:1;
char tlpData[1469];
} TLPPKT;

What I want to realize it to pack the whole TLPPKT into the NLPPKT
->nlpData [1500],
what confused me is the TLPPKT is a structure and includes different
type of variable.So how to put all these infor to just one char
*nlpData ?

Thanks for any comments.

bin YE

[Malcolm]

Re: How to code such function, thanks for any comments


"yezi" <ye_line@hotmai l.com> wrote[color=blue]
>
> The following code is
> typedef struct nlpPkt
> {
> int source:4;
> int destin:4;
> unsigned int control:1;
> unsigned int contype:5;
> int length:10;
> int checksum:16;
> char nlpData[1500];
> } NLPPKT; //same size
>
> typedef struct tlpPkt
> {
> int sequence:7;
> int ack:8;
> int lenghth:10;
> int blankbit:5;
> int End:1;
> char tlpData[1469];
> } TLPPKT;
>
> What I want to realize it to pack the whole TLPPKT into the NLPPKT
> ->nlpData [1500],
> what confused me is the TLPPKT is a structure and includes different
> type of variable.So how to put all these infor to just one char
> *nlpData ?
>[/color]
The cheeze way

memcpy( nlppkt.nlpData, &tlppkt, sizeof(TLPPKT)) ;

( nlppkt and tlppkt structures)

The better way - define function to convert the bitfields, which could have
any layout in memory, to a serial sequence of unsigned chars.