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readWriteFunct.cpp
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readWriteFunct.cpp
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "readWriteFunct.h"
int read_data(int fd, char* buffer) //diavasei ta dedomena ths gramhs me morfh "size data..."
{
char tmp[5];
int len, nread = 0;
const int sizeLenght = 4;
for(int i = 0; i < sizeLenght; i += nread) //ta 4 prwta byte einai to megethos se byte twn data
{
if((nread = read(fd, &tmp[i], sizeLenght-i)) <= 0)
{
return -1;
}
}
tmp[4] = '\0';
len = atoi(tmp);
read(fd, tmp, 1); //agnow to space
for(int i = 0; i < len; i += nread) //diavasw ta dedomena tou buffer
{
if((nread = read(fd, &buffer[i], len-i)) <= 0)
{
return -1;
}
}
return len;
}
int numberOfDigits(int num) //epistrefei to plithos twn psifion toy aritmou
{
if(num == 0) return 1;
int i = 1;
while((num /= 10) != 0)
{
i++;
}
return i;
}
void write_data(int fd, const char* buffer)
{
int len = strlen(buffer) + 1;
char lenString[6];
for(int i = 0; i < 4 - numberOfDigits(len); i++) //gemizw me midenika mexri na exw akrivos 4 byte gia to plithos tou buffer
{
lenString[i] = '0';
}
sprintf(&lenString[4-numberOfDigits(len)], "%d ", len);
write(fd, lenString, 5);
write(fd, buffer, len);
}