1 use crate::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 {