609 lines
16 KiB
Rust
609 lines
16 KiB
Rust
// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use leb128::{self, read_signed_leb128, write_signed_leb128};
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use std::borrow::Cow;
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use std::io::{self, Write};
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use serialize;
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// -----------------------------------------------------------------------------
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// Encoder
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// -----------------------------------------------------------------------------
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pub type EncodeResult = io::Result<()>;
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pub struct Encoder<'a> {
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pub cursor: &'a mut io::Cursor<Vec<u8>>,
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}
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impl<'a> Encoder<'a> {
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pub fn new(cursor: &'a mut io::Cursor<Vec<u8>>) -> Encoder<'a> {
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Encoder { cursor: cursor }
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}
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}
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macro_rules! write_uleb128 {
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($enc:expr, $value:expr, $fun:ident) => {{
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let pos = $enc.cursor.position() as usize;
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let bytes_written = leb128::$fun($enc.cursor.get_mut(), pos, $value);
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$enc.cursor.set_position((pos + bytes_written) as u64);
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Ok(())
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}}
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}
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macro_rules! write_sleb128 {
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($enc:expr, $value:expr) => {{
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let pos = $enc.cursor.position() as usize;
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let bytes_written = write_signed_leb128($enc.cursor.get_mut(), pos, $value as i128);
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$enc.cursor.set_position((pos + bytes_written) as u64);
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Ok(())
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}}
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}
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impl<'a> serialize::Encoder for Encoder<'a> {
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type Error = io::Error;
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#[inline]
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fn emit_nil(&mut self) -> EncodeResult {
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Ok(())
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}
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#[inline]
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fn emit_usize(&mut self, v: usize) -> EncodeResult {
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write_uleb128!(self, v, write_usize_leb128)
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}
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#[inline]
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fn emit_u128(&mut self, v: u128) -> EncodeResult {
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write_uleb128!(self, v, write_u128_leb128)
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}
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#[inline]
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fn emit_u64(&mut self, v: u64) -> EncodeResult {
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write_uleb128!(self, v, write_u64_leb128)
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}
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#[inline]
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fn emit_u32(&mut self, v: u32) -> EncodeResult {
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write_uleb128!(self, v, write_u32_leb128)
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}
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#[inline]
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fn emit_u16(&mut self, v: u16) -> EncodeResult {
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write_uleb128!(self, v, write_u16_leb128)
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}
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#[inline]
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fn emit_u8(&mut self, v: u8) -> EncodeResult {
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let pos = self.cursor.position() as usize;
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leb128::write_to_vec(self.cursor.get_mut(), pos, v);
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self.cursor.set_position((pos + 1) as u64);
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Ok(())
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}
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#[inline]
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fn emit_isize(&mut self, v: isize) -> EncodeResult {
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write_sleb128!(self, v)
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}
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#[inline]
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fn emit_i128(&mut self, v: i128) -> EncodeResult {
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write_sleb128!(self, v)
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}
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#[inline]
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fn emit_i64(&mut self, v: i64) -> EncodeResult {
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write_sleb128!(self, v)
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}
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#[inline]
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fn emit_i32(&mut self, v: i32) -> EncodeResult {
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write_sleb128!(self, v)
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}
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#[inline]
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fn emit_i16(&mut self, v: i16) -> EncodeResult {
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write_sleb128!(self, v)
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}
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#[inline]
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fn emit_i8(&mut self, v: i8) -> EncodeResult {
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let as_u8: u8 = unsafe { ::std::mem::transmute(v) };
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self.emit_u8(as_u8)
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}
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#[inline]
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fn emit_bool(&mut self, v: bool) -> EncodeResult {
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self.emit_u8(if v {
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1
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} else {
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0
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})
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}
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#[inline]
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fn emit_f64(&mut self, v: f64) -> EncodeResult {
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let as_u64: u64 = unsafe { ::std::mem::transmute(v) };
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self.emit_u64(as_u64)
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}
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#[inline]
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fn emit_f32(&mut self, v: f32) -> EncodeResult {
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let as_u32: u32 = unsafe { ::std::mem::transmute(v) };
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self.emit_u32(as_u32)
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}
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#[inline]
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fn emit_char(&mut self, v: char) -> EncodeResult {
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self.emit_u32(v as u32)
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}
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#[inline]
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fn emit_str(&mut self, v: &str) -> EncodeResult {
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self.emit_usize(v.len())?;
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let _ = self.cursor.write_all(v.as_bytes());
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Ok(())
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}
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}
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impl<'a> Encoder<'a> {
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#[inline]
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pub fn position(&self) -> usize {
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self.cursor.position() as usize
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}
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}
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// -----------------------------------------------------------------------------
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// Decoder
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// -----------------------------------------------------------------------------
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pub struct Decoder<'a> {
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pub data: &'a [u8],
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position: usize,
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}
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impl<'a> Decoder<'a> {
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pub fn new(data: &'a [u8], position: usize) -> Decoder<'a> {
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Decoder {
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data,
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position,
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}
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}
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#[inline]
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pub fn position(&self) -> usize {
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self.position
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}
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#[inline]
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pub fn set_position(&mut self, pos: usize) {
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self.position = pos
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}
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#[inline]
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pub fn advance(&mut self, bytes: usize) {
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self.position += bytes;
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}
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}
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macro_rules! read_uleb128 {
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($dec:expr, $t:ty, $fun:ident) => ({
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let (value, bytes_read) = leb128::$fun(&$dec.data[$dec.position ..]);
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$dec.position += bytes_read;
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Ok(value)
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})
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}
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macro_rules! read_sleb128 {
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($dec:expr, $t:ty) => ({
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let (value, bytes_read) = read_signed_leb128($dec.data, $dec.position);
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$dec.position += bytes_read;
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Ok(value as $t)
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})
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}
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impl<'a> serialize::Decoder for Decoder<'a> {
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type Error = String;
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#[inline]
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fn read_nil(&mut self) -> Result<(), Self::Error> {
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Ok(())
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}
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#[inline]
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fn read_u128(&mut self) -> Result<u128, Self::Error> {
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read_uleb128!(self, u128, read_u128_leb128)
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}
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#[inline]
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fn read_u64(&mut self) -> Result<u64, Self::Error> {
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read_uleb128!(self, u64, read_u64_leb128)
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}
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#[inline]
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fn read_u32(&mut self) -> Result<u32, Self::Error> {
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read_uleb128!(self, u32, read_u32_leb128)
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}
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#[inline]
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fn read_u16(&mut self) -> Result<u16, Self::Error> {
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read_uleb128!(self, u16, read_u16_leb128)
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}
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#[inline]
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fn read_u8(&mut self) -> Result<u8, Self::Error> {
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let value = self.data[self.position];
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self.position += 1;
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Ok(value)
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}
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#[inline]
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fn read_usize(&mut self) -> Result<usize, Self::Error> {
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read_uleb128!(self, usize, read_usize_leb128)
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}
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#[inline]
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fn read_i128(&mut self) -> Result<i128, Self::Error> {
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read_sleb128!(self, i128)
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}
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#[inline]
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fn read_i64(&mut self) -> Result<i64, Self::Error> {
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read_sleb128!(self, i64)
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}
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#[inline]
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fn read_i32(&mut self) -> Result<i32, Self::Error> {
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read_sleb128!(self, i32)
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}
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#[inline]
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fn read_i16(&mut self) -> Result<i16, Self::Error> {
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read_sleb128!(self, i16)
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}
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#[inline]
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fn read_i8(&mut self) -> Result<i8, Self::Error> {
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let as_u8 = self.data[self.position];
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self.position += 1;
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unsafe { Ok(::std::mem::transmute(as_u8)) }
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}
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#[inline]
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fn read_isize(&mut self) -> Result<isize, Self::Error> {
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read_sleb128!(self, isize)
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}
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#[inline]
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fn read_bool(&mut self) -> Result<bool, Self::Error> {
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let value = self.read_u8()?;
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Ok(value != 0)
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}
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#[inline]
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fn read_f64(&mut self) -> Result<f64, Self::Error> {
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let bits = self.read_u64()?;
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Ok(unsafe { ::std::mem::transmute(bits) })
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}
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#[inline]
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fn read_f32(&mut self) -> Result<f32, Self::Error> {
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let bits = self.read_u32()?;
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Ok(unsafe { ::std::mem::transmute(bits) })
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}
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#[inline]
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fn read_char(&mut self) -> Result<char, Self::Error> {
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let bits = self.read_u32()?;
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Ok(::std::char::from_u32(bits).unwrap())
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}
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#[inline]
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fn read_str(&mut self) -> Result<Cow<str>, Self::Error> {
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let len = self.read_usize()?;
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let s = ::std::str::from_utf8(&self.data[self.position..self.position + len]).unwrap();
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self.position += len;
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Ok(Cow::Borrowed(s))
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}
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fn error(&mut self, err: &str) -> Self::Error {
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err.to_string()
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}
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}
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#[cfg(test)]
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mod tests {
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use serialize::{Encodable, Decodable};
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use std::io::Cursor;
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use std::fmt::Debug;
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use super::{Encoder, Decoder};
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#[derive(PartialEq, Clone, Debug, RustcEncodable, RustcDecodable)]
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struct Struct {
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a: (),
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b: u8,
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c: u16,
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d: u32,
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e: u64,
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f: usize,
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g: i8,
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h: i16,
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i: i32,
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j: i64,
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k: isize,
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l: char,
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m: String,
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n: f32,
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o: f64,
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p: bool,
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q: Option<u32>,
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}
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fn check_round_trip<T: Encodable + Decodable + PartialEq + Debug>(values: Vec<T>) {
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let mut cursor = Cursor::new(Vec::new());
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for value in &values {
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let mut encoder = Encoder::new(&mut cursor);
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Encodable::encode(&value, &mut encoder).unwrap();
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}
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let data = cursor.into_inner();
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let mut decoder = Decoder::new(&data[..], 0);
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for value in values {
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let decoded = Decodable::decode(&mut decoder).unwrap();
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assert_eq!(value, decoded);
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}
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}
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#[test]
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fn test_unit() {
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check_round_trip(vec![(), (), (), ()]);
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}
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#[test]
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fn test_u8() {
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let mut vec = vec![];
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for i in ::std::u8::MIN..::std::u8::MAX {
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vec.push(i);
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}
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check_round_trip(vec);
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}
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#[test]
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fn test_u16() {
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for i in ::std::u16::MIN..::std::u16::MAX {
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check_round_trip(vec![1, 2, 3, i, i, i]);
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}
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}
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#[test]
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fn test_u32() {
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check_round_trip(vec![1, 2, 3, ::std::u32::MIN, 0, 1, ::std::u32::MAX, 2, 1]);
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}
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#[test]
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fn test_u64() {
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check_round_trip(vec![1, 2, 3, ::std::u64::MIN, 0, 1, ::std::u64::MAX, 2, 1]);
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}
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#[test]
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fn test_usize() {
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check_round_trip(vec![1, 2, 3, ::std::usize::MIN, 0, 1, ::std::usize::MAX, 2, 1]);
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}
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#[test]
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fn test_i8() {
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let mut vec = vec![];
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for i in ::std::i8::MIN..::std::i8::MAX {
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vec.push(i);
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}
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check_round_trip(vec);
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}
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#[test]
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fn test_i16() {
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for i in ::std::i16::MIN..::std::i16::MAX {
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check_round_trip(vec![-1, 2, -3, i, i, i, 2]);
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}
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}
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#[test]
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fn test_i32() {
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check_round_trip(vec![-1, 2, -3, ::std::i32::MIN, 0, 1, ::std::i32::MAX, 2, 1]);
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}
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#[test]
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fn test_i64() {
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check_round_trip(vec![-1, 2, -3, ::std::i64::MIN, 0, 1, ::std::i64::MAX, 2, 1]);
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}
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#[test]
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fn test_isize() {
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check_round_trip(vec![-1, 2, -3, ::std::isize::MIN, 0, 1, ::std::isize::MAX, 2, 1]);
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}
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#[test]
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fn test_bool() {
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check_round_trip(vec![false, true, true, false, false]);
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}
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#[test]
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fn test_f32() {
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let mut vec = vec![];
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for i in -100..100 {
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vec.push((i as f32) / 3.0);
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}
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check_round_trip(vec);
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}
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#[test]
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fn test_f64() {
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let mut vec = vec![];
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for i in -100..100 {
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vec.push((i as f64) / 3.0);
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}
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check_round_trip(vec);
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}
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#[test]
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fn test_char() {
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let vec = vec!['a', 'b', 'c', 'd', 'A', 'X', ' ', '#', 'Ö', 'Ä', 'µ', '€'];
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check_round_trip(vec);
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}
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#[test]
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fn test_string() {
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let vec = vec!["abcbuÖeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
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"abcbuÖganeiovÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
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"abcbuÖganeiovÄnameÜavmpßvmea€µsbpapmaebn".to_string(),
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"abcbuÖganeiovÄnameÜavmpßvmeabpnvapeapmaebn".to_string(),
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"abcbuÖganeiÄnameÜavmpßvmea€µsbpnvapeapmaebn".to_string(),
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"abcbuÖganeiovÄnameÜavmpßvmea€µsbpmaebn".to_string(),
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"abcbuÖganeiovÄnameÜavmpßvmea€µnvapeapmaebn".to_string()];
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check_round_trip(vec);
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}
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#[test]
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fn test_option() {
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check_round_trip(vec![Some(-1i8)]);
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check_round_trip(vec![Some(-2i16)]);
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check_round_trip(vec![Some(-3i32)]);
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check_round_trip(vec![Some(-4i64)]);
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check_round_trip(vec![Some(-5isize)]);
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let none_i8: Option<i8> = None;
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check_round_trip(vec![none_i8]);
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let none_i16: Option<i16> = None;
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check_round_trip(vec![none_i16]);
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let none_i32: Option<i32> = None;
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check_round_trip(vec![none_i32]);
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let none_i64: Option<i64> = None;
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check_round_trip(vec![none_i64]);
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let none_isize: Option<isize> = None;
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check_round_trip(vec![none_isize]);
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}
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#[test]
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fn test_struct() {
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check_round_trip(vec![Struct {
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a: (),
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b: 10,
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c: 11,
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d: 12,
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e: 13,
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f: 14,
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g: 15,
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h: 16,
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i: 17,
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j: 18,
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k: 19,
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l: 'x',
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m: "abc".to_string(),
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n: 20.5,
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o: 21.5,
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p: false,
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q: None,
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}]);
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check_round_trip(vec![Struct {
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a: (),
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b: 101,
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c: 111,
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d: 121,
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e: 131,
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f: 141,
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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),
|
|
Variant3 {
|
|
a: i32,
|
|
b: char,
|
|
c: bool,
|
|
},
|
|
}
|
|
|
|
#[test]
|
|
fn test_enum() {
|
|
check_round_trip(vec![Enum::Variant1,
|
|
Enum::Variant2(1, 2.5),
|
|
Enum::Variant3 {
|
|
a: 3,
|
|
b: 'b',
|
|
c: false,
|
|
},
|
|
Enum::Variant3 {
|
|
a: -4,
|
|
b: 'f',
|
|
c: true,
|
|
}]);
|
|
}
|
|
|
|
#[test]
|
|
fn test_sequence() {
|
|
let mut vec = vec![];
|
|
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();
|
|
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())]);
|
|
}
|
|
}
|