server-client-network/SocketUtils.c

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include "SocketUtils.h"
#include "Stream.h"

int sendAll(int socket, Stream* out)
{
    char* data = out->data;
    int left = out->index;
    while(left > 0)
    {
        int bytes = send(socket, data, left, MSG_NOSIGNAL);
        if(bytes == -1)
        {
            perror("Cannot send data");
            return -1;
        }
        left -= bytes;
        data += bytes;
    }
    return out->index;
}

int receiveAll(int socket, Stream* in)
{   
    int pos = in->index;
    int capacity = in->capacity - pos;
    int size = recv(socket, in->data + pos, capacity, 0);
    if(size > 0)
    {
        in->size = pos + size;
        if(size < capacity)
        {
            return size;
        }
        while(size == capacity)
        {
            // more data must be read
            streamEnsureIndex(in, in->capacity * 2 - 1);
            
            pos += size;
            capacity = in->capacity - pos;

            size = recv(socket, in->data + pos, capacity, MSG_DONTWAIT);
            if(size <= 0)
            {
                size = 0;
                break;
            }
            in->size += size;
            if(size < capacity)
            {
                break;
            }
        }
        pos += size;
        return pos - in->index;
    }
    else if(size == 0)
    {
        printf("Remote Socket closed\n");
        return 0;
    }   
    else
    {
        perror("recv error");
        return -1;
    }
    return -1;
}