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Sending variable length arrays over a network?
typedef struct network_packet
{
    char id;
    int message_size;
    int data[];
} __attribute__((packed)) network_packet;

unsigned char* buffer;
//...fill the buffer and make sure it's the right size -- endian is taken care of
//via library

network_packet* packet_ptr = (network_packet*)buffer;

//access the 10th integer in the packet if the packet_ptr->message_size
//is long enough
if (packet_ptr->message_size >= 10)
    int tenth_int = packet_ptr->data[9];