move msg to api, update win project to vs2019

core/adapter/api_unknow.cpp

@@ -75,3 +75,56 @@ int build_bmp(const char *filename, unsigned int width, unsigned int height, uns
     log_out("Not support now");
     return 0;
 }
+
+c_fifo::c_fifo()
+{
+	m_head = m_tail = 0;
+	m_read_sem = m_write_mutex = 0;
+}
+
+int c_fifo::read(void* buf, int len)
+{
+	unsigned char* pbuf = (unsigned char*)buf;
+	int i = 0;
+	while(i < len)
+	{
+		if (m_tail == m_head)
+		{//empty
+			continue;
+		}
+		*pbuf++ = m_buf[m_head];
+		m_head = (m_head + 1) % FIFO_BUFFER_LEN;
+		i++;
+	}
+	if(i != len)
+	{
+		ASSERT(false);
+	}
+	return i;
+}
+
+int c_fifo::write(void* buf, int len)
+{
+	unsigned char* pbuf = (unsigned char*)buf;
+	int i = 0;
+	int tail = m_tail;
+
+	while(i < len)
+	{
+		if ((m_tail + 1) % FIFO_BUFFER_LEN == m_head)
+		{//full, clear data has been written;
+			m_tail = tail;
+			log_out("Warning: fifo full\n");
+			return 0;
+		}
+		m_buf[m_tail] = *pbuf++;
+		m_tail = (m_tail + 1) % FIFO_BUFFER_LEN;
+		i++;
+	}
+
+	if(i != len)
+	{
+		ASSERT(false);
+	}
+	return i;
+}