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|
extern crate byteorder;
use std::result::Result;
use std::vec::Vec;
use failure::Error;
use log::trace;
use crate::util;
use crate::{Deserialize, DeserializeUTF8, Serialize, SerializeUTF8};
/// We Shadow the String type here as we can only use impl on types in our own scope.
///
/// Strings are serialized as an i32 for the length in bytes, then the chars represented in UTF-16 in bytes.
///
/// Strings can only be serialized as UTF-8 null-terminated ByteArrays with (de)serialize_utf8().
impl Serialize for String {
fn serialize(&self) -> Result<Vec<u8>, Error> {
let mut res: Vec<u8> = Vec::new();
let utf16: Vec<u16> = self.encode_utf16().collect();
for i in utf16 {
res.extend(i.to_be_bytes().iter());
}
util::prepend_byte_len(&mut res);
return Ok(res);
}
}
impl SerializeUTF8 for String {
fn serialize_utf8(&self) -> Result<Vec<u8>, Error> {
let mut res: Vec<u8> = Vec::new();
res.extend(self.clone().into_bytes());
util::prepend_byte_len(&mut res);
return Ok(res);
}
}
impl Deserialize for String {
fn parse(b: &[u8]) -> Result<(usize, Self), Error> {
// Parse Length
let (_, len) = i32::parse(&b[0..4])?;
trace!(target: "primitive::String", "Parsing with length: {:?}, from bytes: {:x?}", len, &b[0..4]);
if len == -1 {
return Ok((4, "".to_string()));
}
// length as usize
let ulen = len as usize;
trace!("parsed bytes: {:x?}", &b[0..ulen]);
let mut pos: usize = 4;
let mut chars: Vec<u16> = Vec::new();
loop {
// if position is behind the length plus our 4 bytes of the length we already parsed
if pos >= (ulen + 4) {
break;
}
let (slen, uchar) = u16::parse(&b[pos..(pos + 2)])?;
chars.push(uchar);
pos += slen;
}
let res: String = String::from_utf16(&chars).unwrap();
trace!("parsed string: {}", res);
return Ok((pos, res));
}
}
impl DeserializeUTF8 for String {
fn parse_utf8(b: &[u8]) -> Result<(usize, Self), Error> {
let (_, len) = i32::parse(&b[0..4])?;
trace!(target: "primitive::String", "Parsing with length: {:?}, from bytes: {:x?}", len, &b[0..4]);
if len <= 0 {
return Ok((4, "".to_string()));
}
let ulen = len as usize;
let mut res: String = String::from_utf8(b[4..(ulen + 4)].to_vec())?;
trace!("parsed string: {}", res);
// If the last byte is zero remove it
// Receiving a string as bytearray will sometimes have
// the string null terminated
if res.chars().last().unwrap() == '\u{0}' {
let _ = res.pop();
}
trace!("parsed string after trunc: {}", res);
trace!("parsed bytes: {:x?}", &b[0..ulen]);
return Ok((ulen + 4, res));
}
}
#[test]
pub fn string_serialize() {
let test_string: String = String::from("Configured");
assert_eq!(
test_string.serialize().unwrap(),
[
0, 0, 0, 20, 0, 67, 0, 111, 0, 110, 0, 102, 0, 105, 0, 103, 0, 117, 0, 114, 0, 101, 0,
100
]
);
}
#[test]
pub fn string_serialize_utf8() {
let test_string: String = String::from("Configured");
assert_eq!(
test_string.serialize_utf8().unwrap(),
[0, 0, 0, 10, 67, 111, 110, 102, 105, 103, 117, 114, 101, 100]
);
}
#[test]
pub fn string_deserialize() {
let test_bytes: &[u8] = &[
0, 0, 0, 20, 0, 67, 0, 111, 0, 110, 0, 102, 0, 105, 0, 103, 0, 117, 0, 114, 0, 101, 0, 100,
0, 0, 0, 1,
];
let (len, res) = String::parse(test_bytes).unwrap();
assert_eq!(res, "Configured");
assert_eq!(len, 24);
}
#[test]
pub fn string_deserialize_utf8() {
let test_bytes: &[u8] = &[
0, 0, 0, 10, 67, 111, 110, 102, 105, 103, 117, 114, 101, 100, 0, 0, 0, 1,
];
let (len, res) = String::parse_utf8(test_bytes).unwrap();
assert_eq!(len, 14);
assert_eq!(res, "Configured");
}
#[test]
pub fn string_deserialize_utf8_null_terminated() {
let test_bytes: &[u8] = &[
0, 0, 0, 11, 67, 111, 110, 102, 105, 103, 117, 114, 101, 100, 0, 0, 0, 0, 1,
];
let (len, res) = String::parse_utf8(test_bytes).unwrap();
assert_eq!(len, 15);
assert_eq!(res, "Configured");
}
|
