1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use leb128::{self, read_signed_leb128, write_signed_leb128};
15 // -----------------------------------------------------------------------------
17 // -----------------------------------------------------------------------------
19 pub type EncodeResult = Result<(), !>;
26 pub fn new(data: Vec<u8>) -> Encoder {
30 pub fn into_inner(self) -> Vec<u8> {
35 pub fn emit_raw_bytes(&mut self, s: &[u8]) {
36 self.data.extend_from_slice(s);
40 macro_rules! write_uleb128 {
41 ($enc:expr, $value:expr, $fun:ident) => {{
42 leb128::$fun(&mut $enc.data, $value);
47 macro_rules! write_sleb128 {
48 ($enc:expr, $value:expr) => {{
49 write_signed_leb128(&mut $enc.data, $value as i128);
54 impl serialize::Encoder for Encoder {
58 fn emit_unit(&mut self) -> EncodeResult {
63 fn emit_usize(&mut self, v: usize) -> EncodeResult {
64 write_uleb128!(self, v, write_usize_leb128)
68 fn emit_u128(&mut self, v: u128) -> EncodeResult {
69 write_uleb128!(self, v, write_u128_leb128)
73 fn emit_u64(&mut self, v: u64) -> EncodeResult {
74 write_uleb128!(self, v, write_u64_leb128)
78 fn emit_u32(&mut self, v: u32) -> EncodeResult {
79 write_uleb128!(self, v, write_u32_leb128)
83 fn emit_u16(&mut self, v: u16) -> EncodeResult {
84 write_uleb128!(self, v, write_u16_leb128)
88 fn emit_u8(&mut self, v: u8) -> EncodeResult {
94 fn emit_isize(&mut self, v: isize) -> EncodeResult {
95 write_sleb128!(self, v)
99 fn emit_i128(&mut self, v: i128) -> EncodeResult {
100 write_sleb128!(self, v)
104 fn emit_i64(&mut self, v: i64) -> EncodeResult {
105 write_sleb128!(self, v)
109 fn emit_i32(&mut self, v: i32) -> EncodeResult {
110 write_sleb128!(self, v)
114 fn emit_i16(&mut self, v: i16) -> EncodeResult {
115 write_sleb128!(self, v)
119 fn emit_i8(&mut self, v: i8) -> EncodeResult {
120 let as_u8: u8 = unsafe { ::std::mem::transmute(v) };
125 fn emit_bool(&mut self, v: bool) -> EncodeResult {
134 fn emit_f64(&mut self, v: f64) -> EncodeResult {
135 let as_u64: u64 = unsafe { ::std::mem::transmute(v) };
136 self.emit_u64(as_u64)
140 fn emit_f32(&mut self, v: f32) -> EncodeResult {
141 let as_u32: u32 = unsafe { ::std::mem::transmute(v) };
142 self.emit_u32(as_u32)
146 fn emit_char(&mut self, v: char) -> EncodeResult {
147 self.emit_u32(v as u32)
151 fn emit_str(&mut self, v: &str) -> EncodeResult {
152 self.emit_usize(v.len())?;
153 self.emit_raw_bytes(v.as_bytes());
160 pub fn position(&self) -> usize {
165 // -----------------------------------------------------------------------------
167 // -----------------------------------------------------------------------------
169 pub struct Decoder<'a> {
174 impl<'a> Decoder<'a> {
176 pub fn new(data: &'a [u8], position: usize) -> Decoder<'a> {
184 pub fn position(&self) -> usize {
189 pub fn set_position(&mut self, pos: usize) {
194 pub fn advance(&mut self, bytes: usize) {
195 self.position += bytes;
199 pub fn read_raw_bytes(&mut self, s: &mut [u8]) -> Result<(), String> {
200 let start = self.position;
201 let end = start + s.len();
203 s.copy_from_slice(&self.data[start..end]);
211 macro_rules! read_uleb128 {
212 ($dec:expr, $t:ty, $fun:ident) => ({
213 let (value, bytes_read) = leb128::$fun(&$dec.data[$dec.position ..]);
214 $dec.position += bytes_read;
219 macro_rules! read_sleb128 {
220 ($dec:expr, $t:ty) => ({
221 let (value, bytes_read) = read_signed_leb128($dec.data, $dec.position);
222 $dec.position += bytes_read;
228 impl<'a> serialize::Decoder for Decoder<'a> {
232 fn read_nil(&mut self) -> Result<(), Self::Error> {
237 fn read_u128(&mut self) -> Result<u128, Self::Error> {
238 read_uleb128!(self, u128, read_u128_leb128)
242 fn read_u64(&mut self) -> Result<u64, Self::Error> {
243 read_uleb128!(self, u64, read_u64_leb128)
247 fn read_u32(&mut self) -> Result<u32, Self::Error> {
248 read_uleb128!(self, u32, read_u32_leb128)
252 fn read_u16(&mut self) -> Result<u16, Self::Error> {
253 read_uleb128!(self, u16, read_u16_leb128)
257 fn read_u8(&mut self) -> Result<u8, Self::Error> {
258 let value = self.data[self.position];
264 fn read_usize(&mut self) -> Result<usize, Self::Error> {
265 read_uleb128!(self, usize, read_usize_leb128)
269 fn read_i128(&mut self) -> Result<i128, Self::Error> {
270 read_sleb128!(self, i128)
274 fn read_i64(&mut self) -> Result<i64, Self::Error> {
275 read_sleb128!(self, i64)
279 fn read_i32(&mut self) -> Result<i32, Self::Error> {
280 read_sleb128!(self, i32)
284 fn read_i16(&mut self) -> Result<i16, Self::Error> {
285 read_sleb128!(self, i16)
289 fn read_i8(&mut self) -> Result<i8, Self::Error> {
290 let as_u8 = self.data[self.position];
292 unsafe { Ok(::std::mem::transmute(as_u8)) }
296 fn read_isize(&mut self) -> Result<isize, Self::Error> {
297 read_sleb128!(self, isize)
301 fn read_bool(&mut self) -> Result<bool, Self::Error> {
302 let value = self.read_u8()?;
307 fn read_f64(&mut self) -> Result<f64, Self::Error> {
308 let bits = self.read_u64()?;
309 Ok(unsafe { ::std::mem::transmute(bits) })
313 fn read_f32(&mut self) -> Result<f32, Self::Error> {
314 let bits = self.read_u32()?;
315 Ok(unsafe { ::std::mem::transmute(bits) })
319 fn read_char(&mut self) -> Result<char, Self::Error> {
320 let bits = self.read_u32()?;
321 Ok(::std::char::from_u32(bits).unwrap())
325 fn read_str(&mut self) -> Result<Cow<str>, Self::Error> {
326 let len = self.read_usize()?;
327 let s = ::std::str::from_utf8(&self.data[self.position..self.position + len]).unwrap();
328 self.position += len;
333 fn error(&mut self, err: &str) -> Self::Error {
341 use serialize::{Encodable, Decodable};
343 use super::{Encoder, Decoder};
345 #[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
369 fn check_round_trip<T: Encodable + Decodable + PartialEq + Debug>(values: Vec<T>) {
370 let mut encoder = Encoder::new(Vec::new());
372 for value in &values {
373 Encodable::encode(&value, &mut encoder).unwrap();
376 let data = encoder.into_inner();
377 let mut decoder = Decoder::new(&data[..], 0);
379 for value in values {
380 let decoded = Decodable::decode(&mut decoder).unwrap();
381 assert_eq!(value, decoded);
387 check_round_trip(vec![(), (), (), ()]);
392 let mut vec = vec![];
393 for i in ::std::u8::MIN..::std::u8::MAX {
396 check_round_trip(vec);
401 for i in ::std::u16::MIN..::std::u16::MAX {
402 check_round_trip(vec![1, 2, 3, i, i, i]);
408 check_round_trip(vec![1, 2, 3, ::std::u32::MIN, 0, 1, ::std::u32::MAX, 2, 1]);
413 check_round_trip(vec![1, 2, 3, ::std::u64::MIN, 0, 1, ::std::u64::MAX, 2, 1]);
418 check_round_trip(vec![1, 2, 3, ::std::usize::MIN, 0, 1, ::std::usize::MAX, 2, 1]);
423 let mut vec = vec![];
424 for i in ::std::i8::MIN..::std::i8::MAX {
427 check_round_trip(vec);
432 for i in ::std::i16::MIN..::std::i16::MAX {
433 check_round_trip(vec![-1, 2, -3, i, i, i, 2]);
439 check_round_trip(vec![-1, 2, -3, ::std::i32::MIN, 0, 1, ::std::i32::MAX, 2, 1]);
444 check_round_trip(vec![-1, 2, -3, ::std::i64::MIN, 0, 1, ::std::i64::MAX, 2, 1]);
449 check_round_trip(vec![-1, 2, -3, ::std::isize::MIN, 0, 1, ::std::isize::MAX, 2, 1]);
454 check_round_trip(vec![false, true, true, false, false]);
459 let mut vec = vec![];
461 vec.push((i as f32) / 3.0);
463 check_round_trip(vec);
468 let mut vec = vec![];
470 vec.push((i as f64) / 3.0);
472 check_round_trip(vec);
477 let vec = vec!['a', 'b', 'c', 'd', 'A', 'X', ' ', '#', 'Ö', 'Ä', 'µ', '€'];
478 check_round_trip(vec);
483 let vec = vec!["abcbuÖeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
484 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
485 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpapmaebn".to_string(),
486 "abcbuÖganeiovÄnameÜavmpßvmeabpnvapeapmaebn".to_string(),
487 "abcbuÖganeiÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
488 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpmaebn".to_string(),
489 "abcbuÖganeiovÄnameÜavmpßvmea€µnvapeapmaebn".to_string()];
491 check_round_trip(vec);
496 check_round_trip(vec![Some(-1i8)]);
497 check_round_trip(vec![Some(-2i16)]);
498 check_round_trip(vec![Some(-3i32)]);
499 check_round_trip(vec![Some(-4i64)]);
500 check_round_trip(vec![Some(-5isize)]);
502 let none_i8: Option<i8> = None;
503 check_round_trip(vec![none_i8]);
505 let none_i16: Option<i16> = None;
506 check_round_trip(vec![none_i16]);
508 let none_i32: Option<i32> = None;
509 check_round_trip(vec![none_i32]);
511 let none_i64: Option<i64> = None;
512 check_round_trip(vec![none_i64]);
514 let none_isize: Option<isize> = None;
515 check_round_trip(vec![none_isize]);
520 check_round_trip(vec![Struct {
535 m: "abc".to_string(),
542 check_round_trip(vec![Struct {
557 m: "def".to_string(),
565 #[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
568 Variant2(usize, f32),
578 check_round_trip(vec![Enum::Variant1,
579 Enum::Variant2(1, 2.5),
594 let mut vec = vec![];
595 for i in -100i64..100i64 {
596 vec.push(i * 100000);
599 check_round_trip(vec![vec]);
604 use std::collections::HashMap;
605 let mut map = HashMap::new();
606 for i in -100i64..100i64 {
607 map.insert(i * 100000, i * 10000);
610 check_round_trip(vec![map]);
615 check_round_trip(vec![('x', (), false, 0.5f32)]);
616 check_round_trip(vec![(9i8, 10u16, 1.5f64)]);
617 check_round_trip(vec![(-12i16, 11u8, 12usize)]);
618 check_round_trip(vec![(1234567isize, 100000000000000u64, 99999999999999i64)]);
619 check_round_trip(vec![(String::new(), "some string".to_string())]);