PIIODevice::bytesAvailible()

fix pistringlist pibinarystream write
pibinarystream::binaryStreamSize()
PIByteArray pibinarystream read with more size fix
pistring pibinarystream read optimization
fix bug in PIIOBinaryStream read and write if failed
workaround in PIIOString::readDevice
PISPI readDevice bug Fixed

libs/main/io_devices/pipeer.cpp

@@ -924,6 +924,15 @@ void PIPeer::changeName(const PIString &new_name) {
 }
 
 
+ssize_t PIPeer::bytesAvailible() const {
+	ssize_t ret = 0;
+	read_buffer_mutex.lock();
+	if (!read_buffer.isEmpty()) ret = read_buffer.back().size();
+	read_buffer_mutex.unlock();
+	return ret;
+}
+
+
 int PIPeer::readDevice(void *read_to, int max_size) {
 	read_buffer_mutex.lock();
 	bool empty = read_buffer.isEmpty();