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use std::collections::HashMap;
use std::fs::File;
use std::io::{Read, Write};
use std::path::Path;
use byteorder::{ReadBytesExt, WriteBytesExt, BigEndian};
use {Error, Result};
use information_element::InformationElement;
const MESSAGE_HEADER_LENGTH: usize = 3;
#[derive(Debug, Default)]
pub struct Message {
protocol_revision_number: u8,
overall_message_length: u16,
information_elements: HashMap<u8, InformationElement>,
}
impl Message {
pub fn from_path<P: AsRef<Path>>(path: P) -> Result<Message> {
let file = try!(File::open(path));
Message::read_from(file)
}
pub fn read_from<R: Read>(mut readable: R) -> Result<Message> {
let mut message: Message = Default::default();
message.protocol_revision_number = try!(readable.read_u8());
if message.protocol_revision_number != 1 {
return Err(Error::InvalidProtocolRevisionNumber(message.protocol_revision_number));
}
message.overall_message_length = try!(readable.read_u16::<BigEndian>());
let mut bytes_read = 0u16;
loop {
let ie = match InformationElement::read_from(&mut readable) {
Ok(ie) => ie,
Err(e) => return Err(e),
};
bytes_read += ie.len();
message.information_elements.insert(ie.id(), ie);
if bytes_read >= message.overall_message_length {
break
}
}
if try!(readable.take(1).read_to_end(&mut Vec::new())) != 0 {
return Err(Error::Oversized);
}
Ok(message)
}
pub fn len(&self) -> usize {
self.overall_message_length as usize + MESSAGE_HEADER_LENGTH
}
pub fn is_mobile_originated(&self) -> bool {
true
}
pub fn is_mobile_terminated(&self) -> bool {
false
}
pub fn into_information_elements(self) -> HashMap<u8, InformationElement> {
self.information_elements
}
pub fn write_to<W: Write>(&self, w: &mut W) -> Result<()> {
try!(w.write_u8(self.protocol_revision_number));
try!(w.write_u16::<BigEndian>(self.overall_message_length));
for information_element in self.information_elements.values() {
try!(w.write_u8(information_element.id()));
let contents = information_element.contents_ref();
try!(w.write_u16::<BigEndian>(contents.len() as u16));
try!(w.write_all(&contents[..]));
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use std::fs::File;
use std::io::{Cursor, Read};
#[test]
fn from_path() {
Message::from_path("data/0-mo.sbd").unwrap();
}
#[test]
fn from_read() {
let file = File::open("data/0-mo.sbd").unwrap();
Message::read_from(file).unwrap();
}
#[test]
fn from_path_that_doesnt_exist() {
assert!(Message::from_path("notafile.sbd").is_err());
}
#[test]
fn from_path_that_is_not_an_sbd_message() {
assert!(Message::from_path("data/1-invalid.sbd").is_err());
}
#[test]
fn len() {
let message = Message::from_path("data/0-mo.sbd").unwrap();
assert_eq!(59, message.len());
}
#[test]
fn is_mobile_originated() {
let message = Message::from_path("data/0-mo.sbd").unwrap();
assert!(message.is_mobile_originated());
assert!(!message.is_mobile_terminated());
}
#[test]
fn undersized() {
let file = File::open("data/0-mo.sbd").unwrap();
let readable = file.take(58);
assert!(Message::read_from(readable).is_err());
}
#[test]
fn oversized() {
let file = File::open("data/0-mo.sbd").unwrap();
let readable = file.chain(Cursor::new(vec![0]));
assert!(Message::read_from(readable).is_err());
}
#[test]
fn write() {
let message = Message::from_path("data/0-mo.sbd").unwrap();
let mut cursor = Cursor::new(Vec::new());
message.write_to(&mut cursor).unwrap();
cursor.set_position(0);
Message::read_from(cursor).unwrap();
}
}