585 lines
20 KiB
Rust
585 lines
20 KiB
Rust
use crate::error::{self, ExpectedKind, io_eof};
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use crate::value::Domain;
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use num::bigint::BigInt;
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use num::traits::cast::{FromPrimitive, ToPrimitive};
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use std::borrow::Cow;
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use std::convert::TryFrom;
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use std::convert::TryInto;
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use std::io;
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use std::marker::PhantomData;
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use super::constants::Tag;
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use super::super::{
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CompoundClass,
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DomainDecode,
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Map,
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NestedValue,
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Record,
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Set,
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Value,
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boundary as B,
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reader::{
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Token,
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Reader,
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ReaderResult,
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},
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signed_integer::SignedInteger,
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source::BinarySource,
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};
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pub struct PackedReader<'de, 'src, S: BinarySource<'de>> {
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pub source: &'src mut S,
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phantom: PhantomData<&'de ()>,
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}
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impl<'de, 'src, S: BinarySource<'de>> BinarySource<'de> for PackedReader<'de, 'src, S> {
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type Mark = S::Mark;
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#[inline(always)]
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fn mark(&mut self) -> io::Result<Self::Mark> {
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self.source.mark()
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}
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#[inline(always)]
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fn restore(&mut self, mark: &Self::Mark) -> io::Result<()> {
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self.source.restore(mark)
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}
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#[inline(always)]
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fn skip(&mut self) -> io::Result<()> {
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self.source.skip()
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}
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#[inline(always)]
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fn peek(&mut self) -> io::Result<Option<u8>> {
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self.source.peek()
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}
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#[inline(always)]
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fn readbytes(&mut self, count: u64) -> io::Result<Cow<'de, [u8]>> {
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self.source.readbytes(count)
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}
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#[inline(always)]
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fn readbytes_into(&mut self, bs: &mut [u8]) -> io::Result<()> {
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self.source.readbytes_into(bs)
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}
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#[inline(always)]
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fn input_position(&mut self) -> io::Result<Option<usize>> {
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self.source.input_position()
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}
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#[inline(always)]
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fn discard(&mut self, count: u64) -> io::Result<()> {
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self.source.discard(count)
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}
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#[inline(always)]
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fn read_to_end(&mut self) -> io::Result<Cow<'de, [u8]>> {
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self.source.read_to_end()
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}
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}
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fn out_of_range<I: Into<BigInt>>(i: I) -> error::Error {
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error::Error::NumberOutOfRange(i.into())
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}
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impl<'de, 'src, S: BinarySource<'de>> PackedReader<'de, 'src, S> {
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#[inline(always)]
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pub fn new(source: &'src mut S) -> Self {
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PackedReader { source, phantom: PhantomData }
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}
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#[inline(always)]
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fn peek_noeof(&mut self) -> io::Result<u8> {
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self.peek()?.ok_or_else(io_eof)
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}
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#[inline(always)]
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fn read(&mut self) -> io::Result<u8> {
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let v = self.peek_noeof()?;
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self.skip()?;
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Ok(v)
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}
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#[inline(always)]
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fn varint(&mut self) -> io::Result<u64> {
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let mut shift = 0;
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let mut acc: u64 = 0;
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loop {
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let v = self.read()?;
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if shift == 63 && v > 1 { Err(error::Error::Message("PackedReader length too long".to_string()))? }
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acc |= ((v & 0x7f) as u64) << shift;
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shift += 7;
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if v & 0x80 == 0 { return Ok(acc) }
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if shift >= 70 { Err(error::Error::Message("PackedReader length too long".to_string()))? }
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}
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}
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#[inline(always)]
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fn peekend(&mut self) -> io::Result<bool> {
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if self.peek()? == Some(Tag::End.into()) {
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self.skip()?;
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Ok(true)
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} else {
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Ok(false)
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}
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}
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#[inline(always)]
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fn peek_next_nonannotation_tag(&mut self) -> ReaderResult<Tag> {
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loop {
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match Tag::try_from(self.peek_noeof()?)? {
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Tag::Annotation => {
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self.skip()?;
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self.skip_value()?;
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},
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other => return Ok(other),
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}
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}
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}
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fn next_atomic(&mut self, expected_tag: Tag, k: ExpectedKind) -> ReaderResult<Cow<'de, [u8]>> {
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let actual_tag = self.peek_next_nonannotation_tag()?;
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if actual_tag == expected_tag {
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self.skip()?;
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let count = self.varint()?;
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Ok(self.readbytes(count)?)
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} else {
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Err(error::Error::Expected(k))
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}
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}
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fn next_compound(&mut self, expected_tag: Tag, k: ExpectedKind) -> ReaderResult<()>
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{
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let actual_tag = self.peek_next_nonannotation_tag()?;
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if actual_tag == expected_tag {
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self.skip()?;
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Ok(())
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} else {
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Err(error::Error::Expected(k))
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}
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}
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#[inline(always)]
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fn read_signed_integer(&mut self, count: u64) -> io::Result<SignedInteger> {
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let count_u64 = count;
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let count: usize = count.try_into().map_err(
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|_| error::Error::Message("Signed integer too long".to_string()))?;
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if count == 0 {
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return Ok(SignedInteger::from(0_i128));
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}
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if count > 16 {
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let bs = self.readbytes(count_u64)?;
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if (bs[0] & 0x80) == 0 {
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// Positive or zero.
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let mut i = 0;
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while i < count && bs[i] == 0 { i += 1; }
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if count - i <= 16 {
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Ok(SignedInteger::from(u128::from_be_bytes(bs[bs.len() - 16..].try_into().unwrap())))
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} else {
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Ok(SignedInteger::from(Cow::Owned(BigInt::from_bytes_be(num::bigint::Sign::Plus, &bs[i..]))))
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}
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} else {
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// Negative.
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let mut i = 0;
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while i < count && bs[i] == 0xff { i += 1; }
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if count - i <= 16 {
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Ok(SignedInteger::from(i128::from_be_bytes(bs[bs.len() - 16..].try_into().unwrap())))
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} else {
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Ok(SignedInteger::from(Cow::Owned(BigInt::from_signed_bytes_be(&bs))))
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}
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}
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} else {
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let first_byte = self.read()?;
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let prefix_byte = if (first_byte & 0x80) == 0 { 0x00 } else { 0xff };
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let mut bs = [prefix_byte; 16];
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bs[16 - count] = first_byte;
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self.readbytes_into(&mut bs[16 - (count - 1)..])?;
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Ok(SignedInteger::from(i128::from_be_bytes(bs)))
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}
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}
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#[inline(always)]
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fn next_unsigned<T: FromPrimitive, F>(&mut self, f: F) -> ReaderResult<T>
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where
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F: FnOnce(u128) -> Option<T>
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{
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let tag = self.peek_next_nonannotation_tag()?;
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match tag {
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Tag::SmallInteger(v) => {
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self.skip()?;
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if v < 0 {
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Err(out_of_range(v))
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} else {
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f(v as u128).ok_or_else(|| out_of_range(v))
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}
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}
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Tag::MediumInteger(count) => {
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self.skip()?;
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let n = &self.read_signed_integer(count.into())?;
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let i = n.try_into().map_err(|_| out_of_range(n))?;
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f(i).ok_or_else(|| out_of_range(i))
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}
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Tag::SignedInteger => {
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self.skip()?;
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let count = self.varint()?;
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let n = &self.read_signed_integer(count)?;
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let i = n.try_into().map_err(|_| out_of_range(n))?;
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f(i).ok_or_else(|| out_of_range(i))
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}
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_ => Err(error::Error::Expected(ExpectedKind::SignedInteger))
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}
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}
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#[inline(always)]
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fn next_signed<T: FromPrimitive, F>(&mut self, f: F) -> ReaderResult<T>
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where
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F: FnOnce(i128) -> Option<T>
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{
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let tag = self.peek_next_nonannotation_tag()?;
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match tag {
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Tag::SmallInteger(v) => {
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self.skip()?;
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f(v.into()).ok_or_else(|| out_of_range(v))
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}
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Tag::MediumInteger(count) => {
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self.skip()?;
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let n = &self.read_signed_integer(count.into())?;
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let i = n.try_into().map_err(|_| out_of_range(n))?;
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f(i).ok_or_else(|| out_of_range(i))
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}
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Tag::SignedInteger => {
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self.skip()?;
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let count = self.varint()?;
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let n = &self.read_signed_integer(count)?;
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let i = n.try_into().map_err(|_| out_of_range(n))?;
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f(i).ok_or_else(|| out_of_range(i))
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}
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_ => Err(error::Error::Expected(ExpectedKind::SignedInteger))
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}
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}
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fn gather_annotations<N: NestedValue, Dec: DomainDecode<N::Embedded>>(
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&mut self,
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dec: &mut Dec,
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) -> io::Result<Vec<N>> {
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let mut annotations = vec![self.demand_next_domain(true, dec)?];
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while Tag::try_from(self.peek_noeof()?)? == Tag::Annotation {
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self.skip()?;
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annotations.push(self.demand_next_domain(true, dec)?);
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}
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Ok(annotations)
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}
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fn skip_annotations(&mut self) -> io::Result<()> {
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self.skip_value()?;
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while Tag::try_from(self.peek_noeof()?)? == Tag::Annotation {
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self.skip()?;
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self.skip_value()?;
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}
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Ok(())
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}
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fn next_upto_end<N: NestedValue, Dec: DomainDecode<N::Embedded>>(
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&mut self,
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read_annotations: bool,
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dec: &mut Dec,
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) -> io::Result<Option<N>> {
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match self.peekend()? {
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true => Ok(None),
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false => Ok(Some(self.demand_next_domain(read_annotations, dec)?)),
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}
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}
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#[inline(always)]
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fn decodestr<'a>(&mut self, cow: Cow<'a, [u8]>) -> io::Result<Cow<'a, str>> {
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match cow {
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Cow::Borrowed(bs) =>
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Ok(Cow::Borrowed(std::str::from_utf8(bs).map_err(|_| self.syntax_error("Invalid UTF-8"))?)),
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Cow::Owned(bs) =>
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Ok(Cow::Owned(String::from_utf8(bs).map_err(|_| self.syntax_error("Invalid UTF-8"))?)),
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}
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}
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}
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impl<'de, 'src, S: BinarySource<'de>> Reader<'de> for PackedReader<'de, 'src, S> {
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fn next_domain<N: NestedValue, Dec: DomainDecode<N::Embedded>>(
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&mut self,
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read_annotations: bool,
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dec: &mut Dec,
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) -> io::Result<Option<N>> {
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match self.peek()? {
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None => return Ok(None),
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Some(_) => (),
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}
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Ok(Some(match Tag::try_from(self.read()?)? {
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Tag::False => N::new(false),
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Tag::True => N::new(true),
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Tag::Float => {
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let mut bs = [0; 4];
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self.readbytes_into(&mut bs)?;
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Value::from(f32::from_bits(u32::from_be_bytes(bs))).wrap()
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}
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Tag::Double => {
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let mut bs = [0; 8];
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self.readbytes_into(&mut bs)?;
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Value::from(f64::from_bits(u64::from_be_bytes(bs))).wrap()
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}
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Tag::Annotation => {
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if read_annotations {
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let mut annotations = self.gather_annotations(dec)?;
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let (existing_annotations, v) = self.demand_next_domain::<N, _>(read_annotations, dec)?.pieces();
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if let Some(vs) = existing_annotations {
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annotations.extend_from_slice(&vs[..]);
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}
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N::wrap(Some(Box::new(annotations)), v)
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} else {
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self.skip_annotations()?;
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self.demand_next_domain(read_annotations, dec)?
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}
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}
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Tag::Embedded => {
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Value::Embedded(dec.decode_embedded(self, read_annotations)?).wrap()
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}
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Tag::SmallInteger(v) => {
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// TODO: prebuild these in value.rs
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Value::from(v).wrap()
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}
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Tag::MediumInteger(count) => {
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let n = self.read_signed_integer(count.into())?;
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Value::SignedInteger(n).wrap()
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}
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Tag::SignedInteger => {
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let count = self.varint()?;
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let n = self.read_signed_integer(count)?;
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Value::SignedInteger(n).wrap()
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}
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Tag::String => {
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let count = self.varint()?;
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let bs = self.readbytes(count)?;
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Value::String(self.decodestr(bs)?.into_owned()).wrap()
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}
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Tag::ByteString => {
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let count = self.varint()?;
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Value::ByteString(self.readbytes(count)?.into_owned()).wrap()
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}
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Tag::Symbol => {
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let count = self.varint()?;
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let bs = self.readbytes(count)?;
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Value::Symbol(self.decodestr(bs)?.into_owned()).wrap()
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}
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Tag::Record => {
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let mut vs = Vec::new();
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while let Some(v) = self.next_upto_end(read_annotations, dec)? { vs.push(v); }
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if vs.is_empty() {
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return Err(self.syntax_error("Too few elements in encoded record"))
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}
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Value::Record(Record(vs)).wrap()
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}
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Tag::Sequence => {
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let mut vs = Vec::new();
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while let Some(v) = self.next_upto_end(read_annotations, dec)? { vs.push(v); }
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Value::Sequence(vs).wrap()
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}
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Tag::Set => {
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let mut s = Set::new();
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while let Some(v) = self.next_upto_end(read_annotations, dec)? { s.insert(v); }
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Value::Set(s).wrap()
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}
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Tag::Dictionary => {
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let mut d = Map::new();
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while let Some(k) = self.next_upto_end(read_annotations, dec)? {
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match self.next_upto_end(read_annotations, dec)? {
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Some(v) => { d.insert(k, v); }
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None => return Err(self.syntax_error("Missing dictionary value")),
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}
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}
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Value::Dictionary(d).wrap()
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}
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tag @ Tag::End => {
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return Err(self.syntax_error(&format!("Invalid tag: {:?}", tag)));
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}
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}))
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}
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#[inline(always)]
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fn open_record(&mut self) -> ReaderResult<()> {
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self.next_compound(Tag::Record, ExpectedKind::Record)
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}
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#[inline(always)]
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fn open_sequence(&mut self) -> ReaderResult<()> {
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self.next_compound(Tag::Sequence, ExpectedKind::Sequence)
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}
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#[inline(always)]
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fn open_set(&mut self) -> ReaderResult<()> {
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self.next_compound(Tag::Set, ExpectedKind::Set)
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}
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#[inline(always)]
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fn open_dictionary(&mut self) -> ReaderResult<()> {
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self.next_compound(Tag::Dictionary, ExpectedKind::Dictionary)
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}
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#[inline(always)]
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fn boundary(&mut self, _b: &B::Type) -> ReaderResult<()> {
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Ok(())
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}
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#[inline(always)]
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fn close_compound(&mut self, _b: &mut B::Type, _i: &B::Item) -> ReaderResult<bool> {
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Ok(self.peekend()?)
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}
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#[inline(always)]
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fn open_embedded(&mut self) -> ReaderResult<()> {
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self.next_compound(Tag::Embedded, ExpectedKind::Embedded)
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}
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#[inline(always)]
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fn close_embedded(&mut self) -> ReaderResult<()> {
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Ok(())
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}
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type Mark = S::Mark;
|
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|
|
#[inline(always)]
|
|
fn mark(&mut self) -> io::Result<Self::Mark> {
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self.source.mark()
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}
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|
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#[inline(always)]
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fn restore(&mut self, mark: &Self::Mark) -> io::Result<()> {
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self.source.restore(mark)
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}
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fn next_token<D: Domain, Dec: DomainDecode<D>>(
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&mut self,
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read_embedded_annotations: bool,
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decode_embedded: &mut Dec,
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) -> io::Result<Token<D>> {
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loop {
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return Ok(match Tag::try_from(self.peek_noeof()?)? {
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Tag::Embedded => {
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self.skip()?;
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Token::Embedded(decode_embedded.decode_embedded(self, read_embedded_annotations)?)
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}
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Tag::False |
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Tag::True |
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Tag::Float |
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Tag::Double |
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Tag::SmallInteger(_) |
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Tag::MediumInteger(_) |
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Tag::SignedInteger |
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Tag::String |
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Tag::ByteString |
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Tag::Symbol =>
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Token::Atom(self.demand_next_domain(false, decode_embedded)?),
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Tag::Record => { self.skip()?; Token::Compound(CompoundClass::Record) }
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Tag::Sequence => { self.skip()?; Token::Compound(CompoundClass::Sequence) }
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Tag::Set => { self.skip()?; Token::Compound(CompoundClass::Set) }
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Tag::Dictionary => { self.skip()?; Token::Compound(CompoundClass::Dictionary) }
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Tag::End => { self.skip()?; Token::End }
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Tag::Annotation => {
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self.skip()?;
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self.skip_annotations()?;
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continue
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}
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})
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}
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}
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#[inline(always)]
|
|
fn next_boolean(&mut self) -> ReaderResult<bool> {
|
|
match self.peek_next_nonannotation_tag()? {
|
|
Tag::False => { self.skip()?; Ok(false) }
|
|
Tag::True => { self.skip()?; Ok(true) }
|
|
_ => Err(error::Error::Expected(ExpectedKind::Boolean)),
|
|
}
|
|
}
|
|
|
|
fn next_signedinteger(&mut self) -> ReaderResult<SignedInteger> {
|
|
let tag = self.peek_next_nonannotation_tag()?;
|
|
match tag {
|
|
Tag::SmallInteger(v) => {
|
|
self.skip()?;
|
|
Ok(SignedInteger::from(v as i32))
|
|
}
|
|
Tag::MediumInteger(count) => {
|
|
self.skip()?;
|
|
Ok(self.read_signed_integer(count.into())?)
|
|
}
|
|
Tag::SignedInteger => {
|
|
self.skip()?;
|
|
let count = self.varint()?;
|
|
Ok(self.read_signed_integer(count)?)
|
|
}
|
|
_ => Err(error::Error::Expected(ExpectedKind::SignedInteger))
|
|
}
|
|
}
|
|
|
|
fn next_i8(&mut self) -> ReaderResult<i8> { self.next_signed(|n| n.to_i8()) }
|
|
fn next_i16(&mut self) -> ReaderResult<i16> { self.next_signed(|n| n.to_i16()) }
|
|
fn next_i32(&mut self) -> ReaderResult<i32> { self.next_signed(|n| n.to_i32()) }
|
|
fn next_i64(&mut self) -> ReaderResult<i64> { self.next_signed(|n| n.to_i64()) }
|
|
fn next_i128(&mut self) -> ReaderResult<i128> { self.next_signed(|n| n.to_i128()) }
|
|
|
|
fn next_u8(&mut self) -> ReaderResult<u8> { self.next_unsigned(|n| n.to_u8()) }
|
|
fn next_u16(&mut self) -> ReaderResult<u16> { self.next_unsigned(|n| n.to_u16()) }
|
|
fn next_u32(&mut self) -> ReaderResult<u32> { self.next_unsigned(|n| n.to_u32()) }
|
|
fn next_u64(&mut self) -> ReaderResult<u64> { self.next_unsigned(|n| n.to_u64()) }
|
|
fn next_u128(&mut self) -> ReaderResult<u128> { self.next_unsigned(|n| n.to_u128()) }
|
|
|
|
fn next_f32(&mut self) -> ReaderResult<f32> {
|
|
match self.peek_next_nonannotation_tag()? {
|
|
Tag::Float => {
|
|
self.skip()?;
|
|
let mut bs = [0; 4];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f32::from_bits(u32::from_be_bytes(bs)))
|
|
},
|
|
Tag::Double => {
|
|
self.skip()?;
|
|
let mut bs = [0; 8];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f64::from_bits(u64::from_be_bytes(bs)) as f32)
|
|
},
|
|
_ => Err(error::Error::Expected(ExpectedKind::Float)),
|
|
}
|
|
}
|
|
|
|
fn next_f64(&mut self) -> ReaderResult<f64> {
|
|
match self.peek_next_nonannotation_tag()? {
|
|
Tag::Float => {
|
|
self.skip()?;
|
|
let mut bs = [0; 4];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f32::from_bits(u32::from_be_bytes(bs)) as f64)
|
|
},
|
|
Tag::Double => {
|
|
self.skip()?;
|
|
let mut bs = [0; 8];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f64::from_bits(u64::from_be_bytes(bs)))
|
|
},
|
|
_ => Err(error::Error::Expected(ExpectedKind::Double)),
|
|
}
|
|
}
|
|
|
|
fn next_str(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
let bs = self.next_atomic(Tag::String, ExpectedKind::Symbol)?;
|
|
Ok(self.decodestr(bs)?)
|
|
}
|
|
|
|
fn next_bytestring(&mut self) -> ReaderResult<Cow<'de, [u8]>> {
|
|
self.next_atomic(Tag::ByteString, ExpectedKind::Symbol)
|
|
}
|
|
|
|
fn next_symbol(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
let bs = self.next_atomic(Tag::Symbol, ExpectedKind::Symbol)?;
|
|
Ok(self.decodestr(bs)?)
|
|
}
|
|
}
|