1 use leb128::{self, read_signed_leb128, write_signed_leb128};
5 // -----------------------------------------------------------------------------
7 // -----------------------------------------------------------------------------
9 pub type EncodeResult = Result<(), !>;
16 pub fn new(data: Vec<u8>) -> Encoder {
20 pub fn into_inner(self) -> Vec<u8> {
25 pub fn emit_raw_bytes(&mut self, s: &[u8]) {
26 self.data.extend_from_slice(s);
30 macro_rules! write_uleb128 {
31 ($enc:expr, $value:expr, $fun:ident) => {{
32 leb128::$fun(&mut $enc.data, $value);
37 macro_rules! write_sleb128 {
38 ($enc:expr, $value:expr) => {{
39 write_signed_leb128(&mut $enc.data, $value as i128);
44 impl serialize::Encoder for Encoder {
48 fn emit_unit(&mut self) -> EncodeResult {
53 fn emit_usize(&mut self, v: usize) -> EncodeResult {
54 write_uleb128!(self, v, write_usize_leb128)
58 fn emit_u128(&mut self, v: u128) -> EncodeResult {
59 write_uleb128!(self, v, write_u128_leb128)
63 fn emit_u64(&mut self, v: u64) -> EncodeResult {
64 write_uleb128!(self, v, write_u64_leb128)
68 fn emit_u32(&mut self, v: u32) -> EncodeResult {
69 write_uleb128!(self, v, write_u32_leb128)
73 fn emit_u16(&mut self, v: u16) -> EncodeResult {
74 write_uleb128!(self, v, write_u16_leb128)
78 fn emit_u8(&mut self, v: u8) -> EncodeResult {
84 fn emit_isize(&mut self, v: isize) -> EncodeResult {
85 write_sleb128!(self, v)
89 fn emit_i128(&mut self, v: i128) -> EncodeResult {
90 write_sleb128!(self, v)
94 fn emit_i64(&mut self, v: i64) -> EncodeResult {
95 write_sleb128!(self, v)
99 fn emit_i32(&mut self, v: i32) -> EncodeResult {
100 write_sleb128!(self, v)
104 fn emit_i16(&mut self, v: i16) -> EncodeResult {
105 write_sleb128!(self, v)
109 fn emit_i8(&mut self, v: i8) -> EncodeResult {
110 let as_u8: u8 = unsafe { ::std::mem::transmute(v) };
115 fn emit_bool(&mut self, v: bool) -> EncodeResult {
124 fn emit_f64(&mut self, v: f64) -> EncodeResult {
125 let as_u64: u64 = unsafe { ::std::mem::transmute(v) };
126 self.emit_u64(as_u64)
130 fn emit_f32(&mut self, v: f32) -> EncodeResult {
131 let as_u32: u32 = unsafe { ::std::mem::transmute(v) };
132 self.emit_u32(as_u32)
136 fn emit_char(&mut self, v: char) -> EncodeResult {
137 self.emit_u32(v as u32)
141 fn emit_str(&mut self, v: &str) -> EncodeResult {
142 self.emit_usize(v.len())?;
143 self.emit_raw_bytes(v.as_bytes());
150 pub fn position(&self) -> usize {
155 // -----------------------------------------------------------------------------
157 // -----------------------------------------------------------------------------
159 pub struct Decoder<'a> {
164 impl<'a> Decoder<'a> {
166 pub fn new(data: &'a [u8], position: usize) -> Decoder<'a> {
174 pub fn position(&self) -> usize {
179 pub fn set_position(&mut self, pos: usize) {
184 pub fn advance(&mut self, bytes: usize) {
185 self.position += bytes;
189 pub fn read_raw_bytes(&mut self, s: &mut [u8]) -> Result<(), String> {
190 let start = self.position;
191 let end = start + s.len();
193 s.copy_from_slice(&self.data[start..end]);
201 macro_rules! read_uleb128 {
202 ($dec:expr, $t:ty, $fun:ident) => ({
203 let (value, bytes_read) = leb128::$fun(&$dec.data[$dec.position ..]);
204 $dec.position += bytes_read;
209 macro_rules! read_sleb128 {
210 ($dec:expr, $t:ty) => ({
211 let (value, bytes_read) = read_signed_leb128($dec.data, $dec.position);
212 $dec.position += bytes_read;
218 impl<'a> serialize::Decoder for Decoder<'a> {
222 fn read_nil(&mut self) -> Result<(), Self::Error> {
227 fn read_u128(&mut self) -> Result<u128, Self::Error> {
228 read_uleb128!(self, u128, read_u128_leb128)
232 fn read_u64(&mut self) -> Result<u64, Self::Error> {
233 read_uleb128!(self, u64, read_u64_leb128)
237 fn read_u32(&mut self) -> Result<u32, Self::Error> {
238 read_uleb128!(self, u32, read_u32_leb128)
242 fn read_u16(&mut self) -> Result<u16, Self::Error> {
243 read_uleb128!(self, u16, read_u16_leb128)
247 fn read_u8(&mut self) -> Result<u8, Self::Error> {
248 let value = self.data[self.position];
254 fn read_usize(&mut self) -> Result<usize, Self::Error> {
255 read_uleb128!(self, usize, read_usize_leb128)
259 fn read_i128(&mut self) -> Result<i128, Self::Error> {
260 read_sleb128!(self, i128)
264 fn read_i64(&mut self) -> Result<i64, Self::Error> {
265 read_sleb128!(self, i64)
269 fn read_i32(&mut self) -> Result<i32, Self::Error> {
270 read_sleb128!(self, i32)
274 fn read_i16(&mut self) -> Result<i16, Self::Error> {
275 read_sleb128!(self, i16)
279 fn read_i8(&mut self) -> Result<i8, Self::Error> {
280 let as_u8 = self.data[self.position];
282 unsafe { Ok(::std::mem::transmute(as_u8)) }
286 fn read_isize(&mut self) -> Result<isize, Self::Error> {
287 read_sleb128!(self, isize)
291 fn read_bool(&mut self) -> Result<bool, Self::Error> {
292 let value = self.read_u8()?;
297 fn read_f64(&mut self) -> Result<f64, Self::Error> {
298 let bits = self.read_u64()?;
299 Ok(unsafe { ::std::mem::transmute(bits) })
303 fn read_f32(&mut self) -> Result<f32, Self::Error> {
304 let bits = self.read_u32()?;
305 Ok(unsafe { ::std::mem::transmute(bits) })
309 fn read_char(&mut self) -> Result<char, Self::Error> {
310 let bits = self.read_u32()?;
311 Ok(::std::char::from_u32(bits).unwrap())
315 fn read_str(&mut self) -> Result<Cow<str>, Self::Error> {
316 let len = self.read_usize()?;
317 let s = ::std::str::from_utf8(&self.data[self.position..self.position + len]).unwrap();
318 self.position += len;
323 fn error(&mut self, err: &str) -> Self::Error {
331 use serialize::{Encodable, Decodable};
333 use super::{Encoder, Decoder};
335 #[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
359 fn check_round_trip<T: Encodable + Decodable + PartialEq + Debug>(values: Vec<T>) {
360 let mut encoder = Encoder::new(Vec::new());
362 for value in &values {
363 Encodable::encode(&value, &mut encoder).unwrap();
366 let data = encoder.into_inner();
367 let mut decoder = Decoder::new(&data[..], 0);
369 for value in values {
370 let decoded = Decodable::decode(&mut decoder).unwrap();
371 assert_eq!(value, decoded);
377 check_round_trip(vec![(), (), (), ()]);
382 let mut vec = vec![];
383 for i in ::std::u8::MIN..::std::u8::MAX {
386 check_round_trip(vec);
391 for i in ::std::u16::MIN..::std::u16::MAX {
392 check_round_trip(vec![1, 2, 3, i, i, i]);
398 check_round_trip(vec![1, 2, 3, ::std::u32::MIN, 0, 1, ::std::u32::MAX, 2, 1]);
403 check_round_trip(vec![1, 2, 3, ::std::u64::MIN, 0, 1, ::std::u64::MAX, 2, 1]);
408 check_round_trip(vec![1, 2, 3, ::std::usize::MIN, 0, 1, ::std::usize::MAX, 2, 1]);
413 let mut vec = vec![];
414 for i in ::std::i8::MIN..::std::i8::MAX {
417 check_round_trip(vec);
422 for i in ::std::i16::MIN..::std::i16::MAX {
423 check_round_trip(vec![-1, 2, -3, i, i, i, 2]);
429 check_round_trip(vec![-1, 2, -3, ::std::i32::MIN, 0, 1, ::std::i32::MAX, 2, 1]);
434 check_round_trip(vec![-1, 2, -3, ::std::i64::MIN, 0, 1, ::std::i64::MAX, 2, 1]);
439 check_round_trip(vec![-1, 2, -3, ::std::isize::MIN, 0, 1, ::std::isize::MAX, 2, 1]);
444 check_round_trip(vec![false, true, true, false, false]);
449 let mut vec = vec![];
451 vec.push((i as f32) / 3.0);
453 check_round_trip(vec);
458 let mut vec = vec![];
460 vec.push((i as f64) / 3.0);
462 check_round_trip(vec);
467 let vec = vec!['a', 'b', 'c', 'd', 'A', 'X', ' ', '#', 'Ö', 'Ä', 'µ', '€'];
468 check_round_trip(vec);
473 let vec = vec!["abcbuÖeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
474 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
475 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpapmaebn".to_string(),
476 "abcbuÖganeiovÄnameÜavmpßvmeabpnvapeapmaebn".to_string(),
477 "abcbuÖganeiÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
478 "abcbuÖganeiovÄnameÜavmpßvmea€µsbpmaebn".to_string(),
479 "abcbuÖganeiovÄnameÜavmpßvmea€µnvapeapmaebn".to_string()];
481 check_round_trip(vec);
486 check_round_trip(vec![Some(-1i8)]);
487 check_round_trip(vec![Some(-2i16)]);
488 check_round_trip(vec![Some(-3i32)]);
489 check_round_trip(vec![Some(-4i64)]);
490 check_round_trip(vec![Some(-5isize)]);
492 let none_i8: Option<i8> = None;
493 check_round_trip(vec![none_i8]);
495 let none_i16: Option<i16> = None;
496 check_round_trip(vec![none_i16]);
498 let none_i32: Option<i32> = None;
499 check_round_trip(vec![none_i32]);
501 let none_i64: Option<i64> = None;
502 check_round_trip(vec![none_i64]);
504 let none_isize: Option<isize> = None;
505 check_round_trip(vec![none_isize]);
510 check_round_trip(vec![Struct {
525 m: "abc".to_string(),
532 check_round_trip(vec![Struct {
547 m: "def".to_string(),
555 #[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
558 Variant2(usize, f32),
568 check_round_trip(vec![Enum::Variant1,
569 Enum::Variant2(1, 2.5),
584 let mut vec = vec![];
585 for i in -100i64..100i64 {
586 vec.push(i * 100000);
589 check_round_trip(vec![vec]);
594 use std::collections::HashMap;
595 let mut map = HashMap::new();
596 for i in -100i64..100i64 {
597 map.insert(i * 100000, i * 10000);
600 check_round_trip(vec![map]);
605 check_round_trip(vec![('x', (), false, 0.5f32)]);
606 check_round_trip(vec![(9i8, 10u16, 1.5f64)]);
607 check_round_trip(vec![(-12i16, 11u8, 12usize)]);
608 check_round_trip(vec![(1234567isize, 100000000000000u64, 99999999999999i64)]);
609 check_round_trip(vec![(String::new(), "some string".to_string())]);