[COMMON][FIFO] Fix bug of FIFO::left() .

diff --git a/source/src/fifo.cpp b/source/src/fifo.cpp
index 98fd0c9..5a74002 100644 (file)
--- a/source/src/fifo.cpp
+++ b/source/src/fifo.cpp
@@ -8,7 +8,7 @@
 */
 
 #include <stdlib.h>
-#include <malloc.h> 
+#include <malloc.h>
 #include "fifo.h"
 #include "fileio.h"
 
@@ -17,7 +17,7 @@ FIFO::FIFO(int s, int empty_warn, int fill_warn)
        size = s;
        //buf = (int*)malloc(size * sizeof(int));
        buf = new int[size];
-       
+
        cnt = rpt = wpt = 0;
        empty_warn_val = empty_warn;
        if(fill_warn <= 0) {
@@ -143,7 +143,7 @@ bool FIFO::full()
 
 int FIFO::left()
 {
-       int val = cnt - size;
+       int val = size - cnt;
        if(val < 0) val = 0;
        if(val > size) val = size;
        return val;
@@ -159,7 +159,7 @@ bool FIFO::empty()
 bool FIFO::process_state(void *f, bool loading)
 {
        FILEIO *state_fio = (FILEIO *)f;
-       
+
        if(!state_fio->StateCheckUint32(STATE_VERSION)) {
                return false;
        }
@@ -170,4 +170,3 @@ bool FIFO::process_state(void *f, bool loading)
        state_fio->StateValue(wpt);
        return true;
 }
-