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#include <stdio.h>
#include "Fifo.h"
Fifo::Fifo ()
{
astate = 0; // not allocated
buffer = NULL;
totsize = 0;
datasize = 0;
start = 0;
pthread_mutex_init (&mut, 0);
}
Fifo::Fifo (unsigned int size)
{
buffer = new char[size];
if (buffer != NULL)
{
astate = 1;
totsize = size;
datasize = 0;
start = 0;
}
else
{
astate = 0;
totsize = 0;
datasize = 0;
start = 0;
}
pthread_mutex_init (&mut, 0);
}
Fifo::~Fifo ()
{
pthread_mutex_lock (&mut);
if (astate)
delete buffer;
pthread_mutex_unlock (&mut);
}
void
Fifo::Flush ()
{
pthread_mutex_lock (&mut);
astate = 1;
//totsize = size;
datasize = 0;
start = 0;
pthread_mutex_unlock (&mut);
//for (int x =0; x < sizeof(buffer); x++) {
// buffer[x] = 0;
//}
}
int
Fifo::ReAlloc (unsigned int size)
{
pthread_mutex_lock (&mut);
if (astate)
delete buffer;
buffer = new char[size];
if (buffer != NULL)
{
astate = 1;
totsize = size;
datasize = 0;
start = 0;
pthread_mutex_unlock (&mut);
}
else
{
astate = 0;
totsize = 0;
datasize = 0;
start = 0;
pthread_mutex_unlock (&mut);
return -1;
}
return 0;
}
void *
Fifo::Read (void *buf, unsigned int &len)
{
pthread_mutex_lock (&mut);
if (len > datasize)
len = datasize;
unsigned int rest;
if (len > (totsize - start))
rest = len - (totsize - start);
else
rest = 0;
unsigned int first = len - rest;
memcpy (buf, buffer + start, first);
memcpy ((char *) buf + first, buffer, rest);
datasize -= len;
start += len;
if (start >= totsize)
start = rest;
//if (datasize == 0) printf("in fifo READ, data is zero\n");
pthread_mutex_unlock (&mut);
return buf;
}
int
Fifo::Write (void *buf, unsigned int len)
{
pthread_mutex_lock (&mut);
unsigned int end;
end = start + datasize;
if (end > totsize)
end = end - totsize;
if (len > (totsize - datasize))
{
pthread_mutex_unlock (&mut);
return -1;
}
unsigned int rest;
if ((len + end) > totsize)
rest = (len + end) - totsize;
else
rest = 0;
unsigned int first = len - rest;
memcpy (buffer + end, buf, first);
memcpy (buffer, (char *) buf + first, rest);
datasize += len;
//if (datasize == 0) printf("in fifo WRITE, data is zero\n");
pthread_mutex_unlock (&mut);
return len;
}
unsigned int
Fifo::FreeSpace (void)
{ // do we need locks here?
int x;
pthread_mutex_lock (&mut);
x = totsize - datasize;
pthread_mutex_unlock (&mut);
return x;
}
unsigned int
Fifo::UsedSpace (void)
{
int x;
pthread_mutex_lock (&mut);
x = datasize;
pthread_mutex_unlock (&mut);
return x;
}
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