rust/src/librbml/opaque.rs

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// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use Error as DecodeError;
use writer::EncodeResult;
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use leb128::{read_signed_leb128, read_unsigned_leb128, write_signed_leb128, write_unsigned_leb128};
use std::io::{self, Write};
use serialize;
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// -----------------------------------------------------------------------------
// Encoder
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// -----------------------------------------------------------------------------
pub struct Encoder<'a> {
pub cursor: &'a mut io::Cursor<Vec<u8>>,
}
impl<'a> Encoder<'a> {
pub fn new(cursor: &'a mut io::Cursor<Vec<u8>>) -> Encoder<'a> {
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Encoder { cursor: cursor }
}
}
macro_rules! write_uleb128 {
($enc:expr, $value:expr) => {{
let pos = $enc.cursor.position() as usize;
let bytes_written = write_unsigned_leb128($enc.cursor.get_mut(), pos, $value as u64);
$enc.cursor.set_position((pos + bytes_written) as u64);
Ok(())
}}
}
macro_rules! write_sleb128 {
($enc:expr, $value:expr) => {{
let pos = $enc.cursor.position() as usize;
let bytes_written = write_signed_leb128($enc.cursor.get_mut(), pos, $value as i64);
$enc.cursor.set_position((pos + bytes_written) as u64);
Ok(())
}}
}
impl<'a> serialize::Encoder for Encoder<'a> {
type Error = io::Error;
fn emit_nil(&mut self) -> EncodeResult {
Ok(())
}
fn emit_uint(&mut self, v: usize) -> EncodeResult {
write_uleb128!(self, v)
}
fn emit_u64(&mut self, v: u64) -> EncodeResult {
write_uleb128!(self, v)
}
fn emit_u32(&mut self, v: u32) -> EncodeResult {
write_uleb128!(self, v)
}
fn emit_u16(&mut self, v: u16) -> EncodeResult {
write_uleb128!(self, v)
}
fn emit_u8(&mut self, v: u8) -> EncodeResult {
let _ = self.cursor.write_all(&[v]);
Ok(())
}
fn emit_int(&mut self, v: isize) -> EncodeResult {
write_sleb128!(self, v)
}
fn emit_i64(&mut self, v: i64) -> EncodeResult {
write_sleb128!(self, v)
}
fn emit_i32(&mut self, v: i32) -> EncodeResult {
write_sleb128!(self, v)
}
fn emit_i16(&mut self, v: i16) -> EncodeResult {
write_sleb128!(self, v)
}
fn emit_i8(&mut self, v: i8) -> EncodeResult {
let as_u8: u8 = unsafe { ::std::mem::transmute(v) };
let _ = self.cursor.write_all(&[as_u8]);
Ok(())
}
fn emit_bool(&mut self, v: bool) -> EncodeResult {
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self.emit_u8(if v {
1
} else {
0
})
}
fn emit_f64(&mut self, v: f64) -> EncodeResult {
let as_u64: u64 = unsafe { ::std::mem::transmute(v) };
self.emit_u64(as_u64)
}
fn emit_f32(&mut self, v: f32) -> EncodeResult {
let as_u32: u32 = unsafe { ::std::mem::transmute(v) };
self.emit_u32(as_u32)
}
fn emit_char(&mut self, v: char) -> EncodeResult {
self.emit_u32(v as u32)
}
fn emit_str(&mut self, v: &str) -> EncodeResult {
self.emit_uint(v.len())?;
let _ = self.cursor.write_all(v.as_bytes());
Ok(())
}
fn emit_enum<F>(&mut self, _name: &str, f: F) -> EncodeResult
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where F: FnOnce(&mut Self) -> EncodeResult
{
f(self)
}
fn emit_enum_variant<F>(&mut self,
_v_name: &str,
v_id: usize,
_len: usize,
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f: F)
-> EncodeResult
where F: FnOnce(&mut Self) -> EncodeResult
{
self.emit_uint(v_id)?;
f(self)
}
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fn emit_enum_variant_arg<F>(&mut self, _: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
fn emit_enum_struct_variant<F>(&mut self,
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v_name: &str,
v_id: usize,
cnt: usize,
f: F)
-> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_enum_variant(v_name, v_id, cnt, f)
}
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fn emit_enum_struct_variant_field<F>(&mut self, _: &str, idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_enum_variant_arg(idx, f)
}
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fn emit_struct<F>(&mut self, _: &str, _len: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
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fn emit_struct_field<F>(&mut self, _name: &str, _: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
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fn emit_tuple<F>(&mut self, len: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_seq(len, f)
}
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fn emit_tuple_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_seq_elt(idx, f)
}
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fn emit_tuple_struct<F>(&mut self, _: &str, len: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_seq(len, f)
}
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fn emit_tuple_struct_arg<F>(&mut self, idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_seq_elt(idx, f)
}
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fn emit_option<F>(&mut self, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_enum("Option", f)
}
fn emit_option_none(&mut self) -> EncodeResult {
self.emit_enum_variant("None", 0, 0, |_| Ok(()))
}
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fn emit_option_some<F>(&mut self, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_enum_variant("Some", 1, 1, f)
}
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fn emit_seq<F>(&mut self, len: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_uint(len)?;
f(self)
}
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fn emit_seq_elt<F>(&mut self, _idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
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fn emit_map<F>(&mut self, len: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
self.emit_uint(len)?;
f(self)
}
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fn emit_map_elt_key<F>(&mut self, _idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
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fn emit_map_elt_val<F>(&mut self, _idx: usize, f: F) -> EncodeResult
where F: FnOnce(&mut Encoder<'a>) -> EncodeResult
{
f(self)
}
}
impl<'a> Encoder<'a> {
pub fn position(&self) -> usize {
self.cursor.position() as usize
}
pub fn from_rbml<'b: 'c, 'c>(rbml: &'c mut ::writer::Encoder<'b>) -> Encoder<'c> {
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Encoder { cursor: rbml.writer }
}
}
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// -----------------------------------------------------------------------------
// Decoder
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// -----------------------------------------------------------------------------
pub struct Decoder<'a> {
pub data: &'a [u8],
position: usize,
}
impl<'a> Decoder<'a> {
pub fn new(data: &'a [u8], position: usize) -> Decoder<'a> {
Decoder {
data: data,
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position: position,
}
}
pub fn position(&self) -> usize {
self.position
}
pub fn advance(&mut self, bytes: usize) {
self.position += bytes;
}
}
macro_rules! read_uleb128 {
($dec:expr, $t:ty) => ({
let (value, bytes_read) = read_unsigned_leb128($dec.data, $dec.position);
$dec.position += bytes_read;
Ok(value as $t)
})
}
macro_rules! read_sleb128 {
($dec:expr, $t:ty) => ({
let (value, bytes_read) = read_signed_leb128($dec.data, $dec.position);
$dec.position += bytes_read;
Ok(value as $t)
})
}
impl<'a> serialize::Decoder for Decoder<'a> {
type Error = DecodeError;
fn read_nil(&mut self) -> Result<(), Self::Error> {
Ok(())
}
fn read_u64(&mut self) -> Result<u64, Self::Error> {
read_uleb128!(self, u64)
}
fn read_u32(&mut self) -> Result<u32, Self::Error> {
read_uleb128!(self, u32)
}
fn read_u16(&mut self) -> Result<u16, Self::Error> {
read_uleb128!(self, u16)
}
fn read_u8(&mut self) -> Result<u8, Self::Error> {
let value = self.data[self.position];
self.position += 1;
Ok(value)
}
fn read_uint(&mut self) -> Result<usize, Self::Error> {
read_uleb128!(self, usize)
}
fn read_i64(&mut self) -> Result<i64, Self::Error> {
read_sleb128!(self, i64)
}
fn read_i32(&mut self) -> Result<i32, Self::Error> {
read_sleb128!(self, i32)
}
fn read_i16(&mut self) -> Result<i16, Self::Error> {
read_sleb128!(self, i16)
}
fn read_i8(&mut self) -> Result<i8, Self::Error> {
let as_u8 = self.data[self.position];
self.position += 1;
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unsafe { Ok(::std::mem::transmute(as_u8)) }
}
fn read_int(&mut self) -> Result<isize, Self::Error> {
read_sleb128!(self, isize)
}
fn read_bool(&mut self) -> Result<bool, Self::Error> {
let value = self.read_u8()?;
Ok(value != 0)
}
fn read_f64(&mut self) -> Result<f64, Self::Error> {
let bits = self.read_u64()?;
Ok(unsafe { ::std::mem::transmute(bits) })
}
fn read_f32(&mut self) -> Result<f32, Self::Error> {
let bits = self.read_u32()?;
Ok(unsafe { ::std::mem::transmute(bits) })
}
fn read_char(&mut self) -> Result<char, Self::Error> {
let bits = self.read_u32()?;
Ok(::std::char::from_u32(bits).unwrap())
}
fn read_str(&mut self) -> Result<String, Self::Error> {
let len = self.read_uint()?;
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let s = ::std::str::from_utf8(&self.data[self.position..self.position + len]).unwrap();
self.position += len;
Ok(s.to_string())
}
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fn read_enum<T, F>(&mut self, _name: &str, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_enum_variant<T, F>(&mut self, _: &[&str], mut f: F) -> Result<T, Self::Error>
where F: FnMut(&mut Decoder<'a>, usize) -> Result<T, Self::Error>
{
let disr = self.read_uint()?;
f(self, disr)
}
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fn read_enum_variant_arg<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_enum_struct_variant<T, F>(&mut self, _: &[&str], mut f: F) -> Result<T, Self::Error>
where F: FnMut(&mut Decoder<'a>, usize) -> Result<T, Self::Error>
{
let disr = self.read_uint()?;
f(self, disr)
}
fn read_enum_struct_variant_field<T, F>(&mut self,
_name: &str,
_idx: usize,
f: F)
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-> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_struct<T, F>(&mut self, _name: &str, _: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_struct_field<T, F>(&mut self, _name: &str, _idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_tuple<T, F>(&mut self, tuple_len: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
self.read_seq(move |d, len| {
if len == tuple_len {
f(d)
} else {
let err = format!("Invalid tuple length. Expected {}, found {}",
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tuple_len,
len);
Err(DecodeError::Expected(err))
}
})
}
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fn read_tuple_arg<T, F>(&mut self, idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
self.read_seq_elt(idx, f)
}
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fn read_tuple_struct<T, F>(&mut self, _name: &str, len: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
self.read_tuple(len, f)
}
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fn read_tuple_struct_arg<T, F>(&mut self, idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
self.read_tuple_arg(idx, f)
}
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fn read_option<T, F>(&mut self, mut f: F) -> Result<T, Self::Error>
where F: FnMut(&mut Decoder<'a>, bool) -> Result<T, Self::Error>
{
self.read_enum("Option", move |this| {
this.read_enum_variant(&["None", "Some"], move |this, idx| {
match idx {
0 => f(this, false),
1 => f(this, true),
_ => {
let msg = format!("Invalid Option index: {}", idx);
Err(DecodeError::Expected(msg))
}
}
})
})
}
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fn read_seq<T, F>(&mut self, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>, usize) -> Result<T, Self::Error>
{
let len = self.read_uint()?;
f(self, len)
}
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fn read_seq_elt<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_map<T, F>(&mut self, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>, usize) -> Result<T, Self::Error>
{
let len = self.read_uint()?;
f(self, len)
}
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fn read_map_elt_key<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
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fn read_map_elt_val<T, F>(&mut self, _idx: usize, f: F) -> Result<T, Self::Error>
where F: FnOnce(&mut Decoder<'a>) -> Result<T, Self::Error>
{
f(self)
}
fn error(&mut self, err: &str) -> Self::Error {
DecodeError::ApplicationError(err.to_string())
}
}
#[cfg(test)]
mod tests {
use serialize::{Encodable, Decodable};
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use std::io::Cursor;
use std::fmt::Debug;
use super::{Encoder, Decoder};
#[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
struct Struct {
a: (),
b: u8,
c: u16,
d: u32,
e: u64,
f: usize,
g: i8,
h: i16,
i: i32,
j: i64,
k: isize,
l: char,
m: String,
n: f32,
o: f64,
p: bool,
q: Option<u32>,
}
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fn check_round_trip<T: Encodable + Decodable + PartialEq + Debug>(values: Vec<T>) {
let mut cursor = Cursor::new(Vec::new());
for value in &values {
let mut encoder = Encoder::new(&mut cursor);
Encodable::encode(&value, &mut encoder).unwrap();
}
let data = cursor.into_inner();
let mut decoder = Decoder::new(&data[..], 0);
for value in values {
let decoded = Decodable::decode(&mut decoder).unwrap();
assert_eq!(value, decoded);
}
}
#[test]
fn test_unit() {
check_round_trip(vec![(), (), (), ()]);
}
#[test]
fn test_u8() {
let mut vec = vec![];
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for i in ::std::u8::MIN..::std::u8::MAX {
vec.push(i);
}
check_round_trip(vec);
}
#[test]
fn test_u16() {
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for i in ::std::u16::MIN..::std::u16::MAX {
check_round_trip(vec![1, 2, 3, i, i, i]);
}
}
#[test]
fn test_u32() {
check_round_trip(vec![1, 2, 3, ::std::u32::MIN, 0, 1, ::std::u32::MAX, 2, 1]);
}
#[test]
fn test_u64() {
check_round_trip(vec![1, 2, 3, ::std::u64::MIN, 0, 1, ::std::u64::MAX, 2, 1]);
}
#[test]
fn test_usize() {
check_round_trip(vec![1, 2, 3, ::std::usize::MIN, 0, 1, ::std::usize::MAX, 2, 1]);
}
#[test]
fn test_i8() {
let mut vec = vec![];
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for i in ::std::i8::MIN..::std::i8::MAX {
vec.push(i);
}
check_round_trip(vec);
}
#[test]
fn test_i16() {
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for i in ::std::i16::MIN..::std::i16::MAX {
check_round_trip(vec![-1, 2, -3, i, i, i, 2]);
}
}
#[test]
fn test_i32() {
check_round_trip(vec![-1, 2, -3, ::std::i32::MIN, 0, 1, ::std::i32::MAX, 2, 1]);
}
#[test]
fn test_i64() {
check_round_trip(vec![-1, 2, -3, ::std::i64::MIN, 0, 1, ::std::i64::MAX, 2, 1]);
}
#[test]
fn test_isize() {
check_round_trip(vec![-1, 2, -3, ::std::isize::MIN, 0, 1, ::std::isize::MAX, 2, 1]);
}
#[test]
fn test_bool() {
check_round_trip(vec![false, true, true, false, false]);
}
#[test]
fn test_f32() {
let mut vec = vec![];
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for i in -100..100 {
vec.push((i as f32) / 3.0);
}
check_round_trip(vec);
}
#[test]
fn test_f64() {
let mut vec = vec![];
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for i in -100..100 {
vec.push((i as f64) / 3.0);
}
check_round_trip(vec);
}
#[test]
fn test_char() {
let vec = vec!['a', 'b', 'c', 'd', 'A', 'X', ' ', '#', 'Ö', 'Ä', 'µ', '€'];
check_round_trip(vec);
}
#[test]
fn test_string() {
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let vec = vec!["abcbuÖeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
"abcbuÖganeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
"abcbuÖganeiovÄnameÜavmpßvmea€µsbpapmaebn".to_string(),
"abcbuÖganeiovÄnameÜavmpßvmeabpnvapeapmaebn".to_string(),
"abcbuÖganeiÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
"abcbuÖganeiovÄnameÜavmpßvmea€µsbpmaebn".to_string(),
"abcbuÖganeiovÄnameÜavmpßvmea€µnvapeapmaebn".to_string()];
check_round_trip(vec);
}
#[test]
fn test_option() {
check_round_trip(vec![Some(-1i8)]);
check_round_trip(vec![Some(-2i16)]);
check_round_trip(vec![Some(-3i32)]);
check_round_trip(vec![Some(-4i64)]);
check_round_trip(vec![Some(-5isize)]);
let none_i8: Option<i8> = None;
check_round_trip(vec![none_i8]);
let none_i16: Option<i16> = None;
check_round_trip(vec![none_i16]);
let none_i32: Option<i32> = None;
check_round_trip(vec![none_i32]);
let none_i64: Option<i64> = None;
check_round_trip(vec![none_i64]);
let none_isize: Option<isize> = None;
check_round_trip(vec![none_isize]);
}
#[test]
fn test_struct() {
check_round_trip(vec![Struct {
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a: (),
b: 10,
c: 11,
d: 12,
e: 13,
f: 14,
g: 15,
h: 16,
i: 17,
j: 18,
k: 19,
l: 'x',
m: "abc".to_string(),
n: 20.5,
o: 21.5,
p: false,
q: None,
}]);
check_round_trip(vec![Struct {
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a: (),
b: 101,
c: 111,
d: 121,
e: 131,
f: 141,
g: -15,
h: -16,
i: -17,
j: -18,
k: -19,
l: 'y',
m: "def".to_string(),
n: -20.5,
o: -21.5,
p: true,
q: Some(1234567),
}]);
}
#[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
enum Enum {
Variant1,
Variant2(usize, f32),
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Variant3 {
a: i32,
b: char,
c: bool,
},
}
#[test]
fn test_enum() {
check_round_trip(vec![Enum::Variant1,
Enum::Variant2(1, 2.5),
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Enum::Variant3 {
a: 3,
b: 'b',
c: false,
},
Enum::Variant3 {
a: -4,
b: 'f',
c: true,
}]);
}
#[test]
fn test_sequence() {
let mut vec = vec![];
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for i in -100i64..100i64 {
vec.push(i * 100000);
}
check_round_trip(vec![vec]);
}
#[test]
fn test_hash_map() {
use std::collections::HashMap;
let mut map = HashMap::new();
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for i in -100i64..100i64 {
map.insert(i * 100000, i * 10000);
}
check_round_trip(vec![map]);
}
#[test]
fn test_tuples() {
check_round_trip(vec![('x', (), false, 0.5f32)]);
check_round_trip(vec![(9i8, 10u16, 1.5f64)]);
check_round_trip(vec![(-12i16, 11u8, 12usize)]);
check_round_trip(vec![(1234567isize, 100000000000000u64, 99999999999999i64)]);
check_round_trip(vec![(String::new(), "some string".to_string())]);
}
}