876 lines
31 KiB
Rust
876 lines
31 KiB
Rust
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::{Read, Error};
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use std::marker::PhantomData;
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use super::constants::{Op, InvalidOp, AtomMinor, CompoundMinor};
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use super::signed_integer::SignedInteger;
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use super::value::{Value, NestedValue, IOValue, FALSE, TRUE, Map, Set, Record, Annotations};
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use crate::error::{self, ExpectedKind, Received, is_eof_io_error, io_eof, io_syntax_error};
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pub type IOResult<T> = std::result::Result<T, Error>;
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pub type ReaderResult<T> = std::result::Result<T, error::Error>;
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#[derive(Debug)]
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pub struct CompoundBody {
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minor: CompoundMinor,
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limit: CompoundLimit,
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}
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#[derive(Debug)]
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pub enum CompoundLimit {
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Counted(usize),
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Streaming,
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Finished,
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}
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impl CompoundBody {
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pub fn counted(minor: CompoundMinor, size: usize) -> Self {
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CompoundBody { minor, limit: CompoundLimit::Counted(size) }
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}
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pub fn streaming(minor: CompoundMinor) -> Self {
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CompoundBody { minor, limit: CompoundLimit::Streaming }
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}
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pub fn more_expected<'de, R: Reader<'de>>(&mut self, read: &mut R) -> ReaderResult<bool> {
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match self.limit {
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CompoundLimit::Counted(ref mut n) =>
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if *n == 0 {
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read.close_compound_counted(self.minor)?;
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self.limit = CompoundLimit::Finished;
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Ok(false)
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} else {
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*n = *n - 1;
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Ok(true)
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},
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CompoundLimit::Streaming =>
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Ok(!read.close_compound_stream(self.minor)?),
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CompoundLimit::Finished =>
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Ok(false),
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}
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}
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pub fn next_symbol<'de, R: Reader<'de>>(&mut self, read: &mut R) -> ReaderResult<Option<Cow<'de, str>>> {
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match self.more_expected(read)? {
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false => Ok(None),
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true => Ok(Some(read.next_symbol()?)),
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}
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}
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pub fn next_value<'de, R: Reader<'de>>(&mut self, read: &mut R, read_annotations: bool) ->
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ReaderResult<Option<IOValue>>
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{
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match self.more_expected(read)? {
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false => Ok(None),
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true => Ok(Some(read.demand_next(read_annotations)?)),
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}
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}
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pub fn remainder<'de, R: Reader<'de>>(&mut self, read: &mut R, read_annotations: bool) ->
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ReaderResult<Vec<IOValue>>
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{
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let mut result = Vec::new();
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while let Some(v) = self.next_value(read, read_annotations)? {
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result.push(v);
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}
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Ok(result)
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}
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pub fn skip_remainder<'de, R: Reader<'de>>(&mut self, read: &mut R) ->
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ReaderResult<()>
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{
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while let true = self.more_expected(read)? {
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read.skip_value()?;
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}
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Ok(())
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}
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pub fn ensure_more_expected<'de, R: Reader<'de>>(&mut self, read: &mut R) -> ReaderResult<()> {
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if self.more_expected(read)? {
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Ok(())
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} else {
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Err(error::Error::MissingItem)
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}
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}
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pub fn ensure_complete<'de, R: Reader<'de>>(&mut self, read: &mut R) -> ReaderResult<()> {
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if self.more_expected(read)? {
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Err(error::Error::MissingCloseDelimiter)
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} else {
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Ok(())
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}
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}
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}
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pub trait Reader<'de> {
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fn next(&mut self, read_annotations: bool) -> IOResult<Option<IOValue>>;
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fn open_record(&mut self, arity: Option<usize>) -> ReaderResult<CompoundBody>;
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fn open_sequence_or_set(&mut self) -> ReaderResult<CompoundBody>;
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fn open_sequence(&mut self) -> ReaderResult<CompoundBody>;
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fn open_set(&mut self) -> ReaderResult<CompoundBody>;
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fn open_dictionary(&mut self) -> ReaderResult<CompoundBody>;
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fn close_compound_counted(&mut self, minor: CompoundMinor) -> ReaderResult<()>;
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fn close_compound_stream(&mut self, minor: CompoundMinor) -> ReaderResult<bool>;
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//---------------------------------------------------------------------------
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fn skip_value(&mut self) -> IOResult<()> {
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// TODO efficient skipping in specific impls of this trait
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let _ = self.demand_next(false)?;
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Ok(())
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}
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fn demand_next(&mut self, read_annotations: bool) -> IOResult<IOValue> {
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match self.next(read_annotations)? {
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None => Err(io_eof()),
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Some(v) => Ok(v)
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}
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}
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fn next_boolean(&mut self) -> ReaderResult<bool> { self.demand_next(false)?.value().to_boolean() }
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fn next_i8(&mut self) -> ReaderResult<i8> { self.demand_next(false)?.value().to_i8() }
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fn next_u8(&mut self) -> ReaderResult<u8> { self.demand_next(false)?.value().to_u8() }
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fn next_i16(&mut self) -> ReaderResult<i16> { self.demand_next(false)?.value().to_i16() }
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fn next_u16(&mut self) -> ReaderResult<u16> { self.demand_next(false)?.value().to_u16() }
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fn next_i32(&mut self) -> ReaderResult<i32> { self.demand_next(false)?.value().to_i32() }
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fn next_u32(&mut self) -> ReaderResult<u32> { self.demand_next(false)?.value().to_u32() }
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fn next_i64(&mut self) -> ReaderResult<i64> { self.demand_next(false)?.value().to_i64() }
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fn next_u64(&mut self) -> ReaderResult<u64> { self.demand_next(false)?.value().to_u64() }
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fn next_i128(&mut self) -> ReaderResult<i128> { self.demand_next(false)?.value().to_i128() }
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fn next_u128(&mut self) -> ReaderResult<u128> { self.demand_next(false)?.value().to_u128() }
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fn next_float(&mut self) -> ReaderResult<f32> { self.demand_next(false)?.value().to_float() }
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fn next_double(&mut self) -> ReaderResult<f64> { self.demand_next(false)?.value().to_double() }
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fn next_char(&mut self) -> ReaderResult<char> { self.demand_next(false)?.value().to_char() }
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fn next_str(&mut self) -> ReaderResult<Cow<'de, str>> {
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Ok(Cow::Owned(self.demand_next(false)?.value().to_string()?.to_owned()))
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}
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fn next_bytestring(&mut self) -> ReaderResult<Cow<'de, [u8]>> {
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Ok(Cow::Owned(self.demand_next(false)?.value().to_bytestring()?.to_owned()))
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}
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fn next_symbol(&mut self) -> ReaderResult<Cow<'de, str>> {
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Ok(Cow::Owned(self.demand_next(false)?.value().to_symbol()?.to_owned()))
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}
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fn open_option(&mut self) ->
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ReaderResult<(bool, CompoundBody)>
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where
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Self: Sized
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{
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let mut compound_body = self.open_record(None)?;
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let label: &str = &compound_body.next_symbol(self)?.ok_or(error::Error::MissingItem)?;
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match label {
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"None" => Ok((false, compound_body)),
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"Some" => Ok((true, compound_body)),
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_ => Err(error::Error::Expected(ExpectedKind::Option,
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Received::ReceivedRecordWithLabel(label.to_owned()))),
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}
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}
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fn open_simple_record(&mut self, name: &str, arity: Option<usize>) ->
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ReaderResult<CompoundBody>
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where
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Self: Sized
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{
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let mut compound_body = self.open_record(arity)?;
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let label: &str = &compound_body.next_symbol(self)?.ok_or(error::Error::MissingItem)?;
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if label == name {
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Ok(compound_body)
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} else {
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Err(error::Error::Expected(ExpectedKind::SimpleRecord(name.to_owned(), arity),
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Received::ReceivedRecordWithLabel(label.to_owned())))
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}
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}
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}
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impl<'r, 'de, R: Reader<'de>> Reader<'de> for &'r mut R {
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fn next(&mut self, read_annotations: bool) -> IOResult<Option<IOValue>> {
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(*self).next(read_annotations)
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}
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fn open_record(&mut self, arity: Option<usize>) -> ReaderResult<CompoundBody> {
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(*self).open_record(arity)
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}
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fn open_sequence_or_set(&mut self) -> ReaderResult<CompoundBody> {
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(*self).open_sequence_or_set()
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}
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fn open_sequence(&mut self) -> ReaderResult<CompoundBody> {
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(*self).open_sequence()
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}
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fn open_set(&mut self) -> ReaderResult<CompoundBody> {
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(*self).open_set()
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}
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fn open_dictionary(&mut self) -> ReaderResult<CompoundBody> {
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(*self).open_dictionary()
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}
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fn close_compound_counted(&mut self, minor: CompoundMinor) -> ReaderResult<()> {
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(*self).close_compound_counted(minor)
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}
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fn close_compound_stream(&mut self, minor: CompoundMinor) -> ReaderResult<bool> {
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(*self).close_compound_stream(minor)
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}
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}
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pub trait BinarySource<'de> {
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fn skip(&mut self) -> IOResult<()>;
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fn peek(&mut self) -> IOResult<u8>;
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fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>>;
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fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()>;
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}
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pub struct IOBinarySource<'a, R: Read> {
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pub read: &'a mut R,
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pub buf: Option<u8>,
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}
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impl<'a, R: Read> IOBinarySource<'a, R> {
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pub fn new(read: &'a mut R) -> Self {
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IOBinarySource { read, buf: None }
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}
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}
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impl<'de, 'a, R: Read> BinarySource<'de> for IOBinarySource<'a, R> {
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fn skip(&mut self) -> IOResult<()> {
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if let None = self.buf { unreachable!(); }
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self.buf = None;
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Ok(())
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}
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fn peek(&mut self) -> IOResult<u8> {
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match self.buf {
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Some(b) => Ok(b),
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None => {
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let b = &mut [0];
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match self.read.read(b)? {
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0 => Err(io_eof()),
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1 => {
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self.buf = Some(b[0]);
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Ok(b[0])
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}
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_ => unreachable!(),
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}
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}
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}
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}
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fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>> {
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if let Some(_) = self.buf { unreachable!(); }
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let mut bs = vec![0; count];
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self.read.read_exact(&mut bs)?;
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Ok(Cow::Owned(bs))
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}
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fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()> {
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if let Some(_) = self.buf { unreachable!(); }
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self.read.read_exact(bs)
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}
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}
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pub struct BytesBinarySource<'de> {
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pub bytes: &'de [u8],
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pub index: usize,
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}
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impl<'de> BytesBinarySource<'de> {
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pub fn new(bytes: &'de [u8]) -> Self {
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BytesBinarySource { bytes, index: 0 }
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}
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}
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impl<'de> BinarySource<'de> for BytesBinarySource<'de> {
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fn skip(&mut self) -> IOResult<()> {
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if self.index >= self.bytes.len() { unreachable!(); }
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self.index += 1;
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Ok(())
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}
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fn peek(&mut self) -> IOResult<u8> {
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if self.index >= self.bytes.len() {
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Err(io_eof())
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} else {
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Ok(self.bytes[self.index])
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}
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}
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fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>> {
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if self.index + count > self.bytes.len() {
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Err(io_eof())
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} else {
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let bs = &self.bytes[self.index..self.index+count];
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self.index += count;
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Ok(Cow::Borrowed(bs))
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}
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}
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fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()> {
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let count = bs.len();
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if self.index + count > self.bytes.len() {
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Err(io_eof())
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} else {
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bs.copy_from_slice(&self.bytes[self.index..self.index+count]);
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self.index += count;
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Ok(())
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}
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}
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}
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pub struct BinaryReader<'de, S: BinarySource<'de>> {
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pub source: S,
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phantom: PhantomData<&'de ()>,
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}
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impl<'de, S: BinarySource<'de>> BinarySource<'de> for BinaryReader<'de, S> {
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fn skip(&mut self) -> IOResult<()> {
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self.source.skip()
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}
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fn peek(&mut self) -> IOResult<u8> {
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self.source.peek()
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}
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fn readbytes(&mut self, count: usize) -> IOResult<Cow<'de, [u8]>> {
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self.source.readbytes(count)
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}
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fn readbytes_into(&mut self, bs: &mut [u8]) -> IOResult<()> {
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self.source.readbytes_into(bs)
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}
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}
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pub fn from_bytes<'de>(bytes: &'de [u8]) ->
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BinaryReader<'de, BytesBinarySource<'de>>
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{
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BinaryReader::new(BytesBinarySource::new(bytes))
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}
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pub fn from_read<'de, 'a, IOR: std::io::Read>(read: &'a mut IOR) ->
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BinaryReader<'de, IOBinarySource<'a, IOR>>
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{
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BinaryReader::new(IOBinarySource::new(read))
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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, S: BinarySource<'de>> BinaryReader<'de, S> {
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pub fn new(source: S) -> Self {
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BinaryReader { source, phantom: PhantomData }
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}
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fn read(&mut self) -> IOResult<u8> {
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let v = self.peek()?;
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self.skip()?;
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Ok(v)
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}
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fn expected(&mut self, k: ExpectedKind) -> error::Error {
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match self.demand_next(true) {
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Ok(v) => error::Error::Expected(k, Received::ReceivedOtherValue(v)),
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Err(e) => e.into()
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}
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}
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fn varint(&mut self) -> IOResult<usize> {
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let mut shift = 0;
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let mut acc: usize = 0;
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loop {
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let v = self.read()?;
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acc = acc | (((v & 0x7f) as usize) << shift);
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shift = shift + 7;
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if v & 0x80 == 0 { return Ok(acc) }
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}
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}
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fn wirelength(&mut self, arg: u8) -> IOResult<usize> {
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if arg < 15 {
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Ok(usize::from(arg))
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} else {
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self.varint()
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}
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}
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fn peekend(&mut self) -> IOResult<bool> {
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if self.peek()? == 4 {
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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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fn gather_chunks(&mut self) -> IOResult<Vec<u8>> {
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let mut bs = Vec::with_capacity(256);
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while !self.peekend()? {
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match decodeop(self.peek()?)? {
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(Op::Atom(AtomMinor::ByteString), arg) => {
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self.skip()?;
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let count = self.wirelength(arg)?;
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if count == 0 {
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return Err(io_syntax_error("Empty binary chunks are forbidden"));
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}
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bs.extend_from_slice(&self.readbytes(count)?)
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},
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_ => return Err(io_syntax_error("Unexpected non-format-B-ByteString chunk"))
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}
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}
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Ok(bs)
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}
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fn peek_next_nonannotation_op(&mut self) -> ReaderResult<(Op, u8)> {
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loop {
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match decodeop(self.peek()?)? {
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(Op::Misc(0), 5) => {
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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, minor: AtomMinor, k: ExpectedKind) -> ReaderResult<Cow<'de, [u8]>> {
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match self.peek_next_nonannotation_op()? {
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(Op::Atom(actual_minor), arg) if actual_minor == minor => {
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self.skip()?;
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let count = self.wirelength(arg)?;
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Ok(self.readbytes(count)?)
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}
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(Op::Misc(2), arg) => match Op::try_from(arg)? {
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Op::Atom(actual_minor) if actual_minor == minor => {
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self.skip()?;
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Ok(Cow::Owned(self.gather_chunks()?))
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}
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_ => Err(self.expected(k)),
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},
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_ => Err(self.expected(k)),
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}
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}
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fn next_compound(&mut self, minor: CompoundMinor, k: ExpectedKind) ->
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ReaderResult<CompoundBody>
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{
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match self.peek_next_nonannotation_op()? {
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(Op::Compound(actual_minor), arg) if actual_minor == minor => {
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self.skip()?;
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Ok(CompoundBody::counted(minor, self.wirelength(arg)?))
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}
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(Op::Misc(2), arg) => match Op::try_from(arg)? {
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Op::Compound(actual_minor) if actual_minor == minor => {
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self.skip()?;
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Ok(CompoundBody::streaming(minor))
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}
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_ => Err(self.expected(k)),
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},
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_ => Err(self.expected(k)),
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}
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}
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fn read_number_format_b(&mut self, count: usize) -> IOResult<SignedInteger> {
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if count == 0 {
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return Ok(SignedInteger::from(0 as i128));
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}
|
|
|
|
if count > 16 {
|
|
let bs = self.readbytes(count)?;
|
|
if (bs[0] & 0x80) == 0 {
|
|
// Positive or zero.
|
|
let mut i = 0;
|
|
while i < count && bs[i] == 0 { i = i + 1; }
|
|
if count - i <= 16 {
|
|
Ok(SignedInteger::from(u128::from_be_bytes(bs[bs.len() - 16..].try_into().unwrap())))
|
|
} else {
|
|
Ok(SignedInteger::from(Cow::Owned(BigInt::from_bytes_be(num::bigint::Sign::Plus, &bs[i..]))))
|
|
}
|
|
} else {
|
|
// Negative.
|
|
let mut i = 0;
|
|
while i < count && bs[i] == 0xff { i = i + 1; }
|
|
if count - i <= 16 {
|
|
Ok(SignedInteger::from(i128::from_be_bytes(bs[bs.len() - 16..].try_into().unwrap())))
|
|
} else {
|
|
Ok(SignedInteger::from(Cow::Owned(BigInt::from_signed_bytes_be(&bs))))
|
|
}
|
|
}
|
|
} else {
|
|
let first_byte = self.read()?;
|
|
let prefix_byte = if (first_byte & 0x80) == 0 { 0x00 } else { 0xff };
|
|
let mut bs = [prefix_byte; 16];
|
|
bs[16 - count] = first_byte;
|
|
self.readbytes_into(&mut bs[16 - (count - 1)..])?;
|
|
Ok(SignedInteger::from(i128::from_be_bytes(bs)))
|
|
}
|
|
}
|
|
|
|
fn next_unsigned<T: FromPrimitive, F>(&mut self, f: F) -> ReaderResult<T>
|
|
where
|
|
F: FnOnce(u128) -> Option<T>
|
|
{
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Misc(3), arg) => {
|
|
self.skip()?;
|
|
if arg > 12 {
|
|
Err(out_of_range((arg as i8) - 16))
|
|
} else {
|
|
f(arg as u128).ok_or_else(|| out_of_range(arg))
|
|
}
|
|
}
|
|
(Op::Atom(AtomMinor::SignedInteger), arg) => {
|
|
self.skip()?;
|
|
let count = self.wirelength(arg)?;
|
|
let n = &self.read_number_format_b(count)?;
|
|
let i = n.try_into().or_else(|_| Err(out_of_range(n)))?;
|
|
f(i).ok_or_else(|| out_of_range(i))
|
|
}
|
|
_ => {
|
|
let n_value = self.demand_next(false)?;
|
|
let n = n_value.value().to_signedinteger()?;
|
|
let i = n.try_into().or_else(|_| Err(out_of_range(n)))?;
|
|
f(i).ok_or_else(|| out_of_range(i))
|
|
}
|
|
}
|
|
}
|
|
|
|
fn next_signed<T: FromPrimitive, F>(&mut self, f: F) -> ReaderResult<T>
|
|
where
|
|
F: FnOnce(i128) -> Option<T>
|
|
{
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Misc(3), arg) => {
|
|
self.skip()?;
|
|
let n = arg as i128;
|
|
let n = if n > 12 { n - 16 } else { n };
|
|
f(n).ok_or_else(|| out_of_range(n))
|
|
}
|
|
(Op::Atom(AtomMinor::SignedInteger), arg) => {
|
|
self.skip()?;
|
|
let count = self.wirelength(arg)?;
|
|
let n = &self.read_number_format_b(count)?;
|
|
let i = n.try_into().or_else(|_| Err(out_of_range(n)))?;
|
|
f(i).ok_or_else(|| out_of_range(i))
|
|
}
|
|
_ => {
|
|
let n_value = self.demand_next(false)?;
|
|
let n = n_value.value().to_signedinteger()?;
|
|
let i = n.try_into().or_else(|_| Err(out_of_range(n)))?;
|
|
f(i).ok_or_else(|| out_of_range(i))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'de, S: BinarySource<'de>> Reader<'de> for BinaryReader<'de, S> {
|
|
fn next(&mut self, read_annotations: bool) -> IOResult<Option<IOValue>> {
|
|
match self.peek() {
|
|
Err(e) if is_eof_io_error(&e) => return Ok(None),
|
|
Err(e) => return Err(e),
|
|
Ok(_) => (),
|
|
}
|
|
loop {
|
|
return Ok(Some(match decodeop(self.read()?)? {
|
|
(Op::Misc(0), 0) => FALSE.clone(),
|
|
(Op::Misc(0), 1) => TRUE.clone(),
|
|
(Op::Misc(0), 2) => {
|
|
let mut bs = [0; 4];
|
|
self.readbytes_into(&mut bs)?;
|
|
Value::from(f32::from_bits(u32::from_be_bytes(bs))).wrap()
|
|
}
|
|
(Op::Misc(0), 3) => {
|
|
let mut bs = [0; 8];
|
|
self.readbytes_into(&mut bs)?;
|
|
Value::from(f64::from_bits(u64::from_be_bytes(bs))).wrap()
|
|
}
|
|
(Op::Misc(0), 5) => {
|
|
if read_annotations {
|
|
let mut annotations = vec![self.demand_next(read_annotations)?];
|
|
while decodeop(self.peek()?)? == (Op::Misc(0), 5) {
|
|
self.skip()?;
|
|
annotations.push(self.demand_next(read_annotations)?);
|
|
}
|
|
let (existing_annotations, v) = self.demand_next(read_annotations)?.pieces();
|
|
annotations.extend_from_slice(existing_annotations.slice());
|
|
IOValue::wrap(Annotations::new(Some(annotations)), v)
|
|
} else {
|
|
self.skip_value()?;
|
|
continue;
|
|
}
|
|
}
|
|
(Op::Misc(0), _) => Err(io_syntax_error("Invalid format A encoding"))?,
|
|
(Op::Misc(1), _) => Err(io_syntax_error("Invalid format A encoding"))?,
|
|
(Op::Misc(2), arg) => match Op::try_from(arg)? {
|
|
Op::Atom(minor) =>
|
|
decodebinary(minor, Cow::Owned(self.gather_chunks()?))?,
|
|
Op::Compound(minor) => decodecompound(minor, DelimitedStream {
|
|
reader: ConfiguredBinaryReader {
|
|
reader: self,
|
|
read_annotations,
|
|
phantom: PhantomData,
|
|
},
|
|
})?,
|
|
_ => Err(io_syntax_error("Invalid format C start byte"))?,
|
|
}
|
|
(Op::Misc(3), arg) => {
|
|
let n = if arg > 12 { i32::from(arg) - 16 } else { i32::from(arg) };
|
|
// TODO: prebuild these in value.rs
|
|
Value::from(n).wrap()
|
|
}
|
|
(Op::Misc(_), _) => unreachable!(),
|
|
(Op::Atom(AtomMinor::SignedInteger), arg) => {
|
|
let count = self.wirelength(arg)?;
|
|
let n = self.read_number_format_b(count)?;
|
|
Value::SignedInteger(n).wrap()
|
|
}
|
|
(Op::Atom(minor), arg) => {
|
|
let count = self.wirelength(arg)?;
|
|
decodebinary(minor, self.readbytes(count)?)?
|
|
}
|
|
(Op::Compound(minor), arg) => {
|
|
let count = self.wirelength(arg)?;
|
|
decodecompound(minor, CountedStream {
|
|
reader: ConfiguredBinaryReader {
|
|
reader: self,
|
|
read_annotations,
|
|
phantom: PhantomData,
|
|
},
|
|
count,
|
|
})?
|
|
}
|
|
(Op::Reserved(3), 15) => continue,
|
|
(Op::Reserved(_), _) => return Err(InvalidOp.into()),
|
|
}))
|
|
}
|
|
}
|
|
|
|
fn open_record(&mut self, arity: Option<usize>) -> ReaderResult<CompoundBody> {
|
|
if let Some(expected_arity) = arity {
|
|
let compound_format =
|
|
self.next_compound(CompoundMinor::Record, ExpectedKind::Record(arity))?;
|
|
if let CompoundLimit::Counted(count) = compound_format.limit {
|
|
if count != expected_arity + 1 /* we add 1 for the label */ {
|
|
return Err(error::Error::Expected(ExpectedKind::Record(arity),
|
|
Received::ReceivedSomethingElse));
|
|
}
|
|
}
|
|
Ok(compound_format)
|
|
} else {
|
|
self.next_compound(CompoundMinor::Record, ExpectedKind::Record(None))
|
|
}
|
|
}
|
|
|
|
fn open_sequence_or_set(&mut self) -> ReaderResult<CompoundBody> {
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Compound(minor), arg)
|
|
if CompoundMinor::Sequence == minor || CompoundMinor::Set == minor => {
|
|
self.skip()?;
|
|
Ok(CompoundBody::counted(minor, self.wirelength(arg)?))
|
|
}
|
|
(Op::Misc(2), arg) => match Op::try_from(arg)? {
|
|
Op::Compound(minor)
|
|
if CompoundMinor::Sequence == minor || CompoundMinor::Set == minor => {
|
|
self.skip()?;
|
|
Ok(CompoundBody::streaming(minor))
|
|
}
|
|
_ => Err(self.expected(ExpectedKind::SequenceOrSet)),
|
|
}
|
|
_ => Err(self.expected(ExpectedKind::SequenceOrSet)),
|
|
}
|
|
}
|
|
|
|
fn open_sequence(&mut self) -> ReaderResult<CompoundBody> {
|
|
self.next_compound(CompoundMinor::Sequence, ExpectedKind::Sequence)
|
|
}
|
|
|
|
fn open_set(&mut self) -> ReaderResult<CompoundBody> {
|
|
self.next_compound(CompoundMinor::Set, ExpectedKind::Set)
|
|
}
|
|
|
|
fn open_dictionary(&mut self) -> ReaderResult<CompoundBody> {
|
|
self.next_compound(CompoundMinor::Dictionary, ExpectedKind::Dictionary)
|
|
}
|
|
|
|
fn close_compound_counted(&mut self, _minor: CompoundMinor) -> ReaderResult<()> {
|
|
// Nothing to do -- no close delimiter to consume
|
|
Ok(())
|
|
}
|
|
|
|
fn close_compound_stream(&mut self, _minor: CompoundMinor) -> ReaderResult<bool> {
|
|
Ok(self.peekend()?)
|
|
}
|
|
|
|
fn next_boolean(&mut self) -> ReaderResult<bool> {
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Misc(0), 0) => { self.skip()?; Ok(false) }
|
|
(Op::Misc(0), 1) => { self.skip()?; Ok(true) }
|
|
_ => Err(self.expected(ExpectedKind::Boolean)),
|
|
}
|
|
}
|
|
|
|
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_float(&mut self) -> ReaderResult<f32> {
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Misc(0), 2) => {
|
|
self.skip()?;
|
|
let mut bs = [0; 4];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f32::from_bits(u32::from_be_bytes(bs)))
|
|
},
|
|
(Op::Misc(0), 3) => {
|
|
self.skip()?;
|
|
let mut bs = [0; 8];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f64::from_bits(u64::from_be_bytes(bs)) as f32)
|
|
},
|
|
_ => Err(self.expected(ExpectedKind::Float)),
|
|
}
|
|
}
|
|
|
|
fn next_double(&mut self) -> ReaderResult<f64> {
|
|
match self.peek_next_nonannotation_op()? {
|
|
(Op::Misc(0), 2) => {
|
|
self.skip()?;
|
|
let mut bs = [0; 4];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f32::from_bits(u32::from_be_bytes(bs)) as f64)
|
|
},
|
|
(Op::Misc(0), 3) => {
|
|
self.skip()?;
|
|
let mut bs = [0; 8];
|
|
self.readbytes_into(&mut bs)?;
|
|
Ok(f64::from_bits(u64::from_be_bytes(bs)))
|
|
},
|
|
_ => Err(self.expected(ExpectedKind::Double)),
|
|
}
|
|
}
|
|
|
|
fn next_str(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
Ok(decodestr(self.next_atomic(AtomMinor::String, ExpectedKind::Symbol)?)?)
|
|
}
|
|
|
|
fn next_bytestring(&mut self) -> ReaderResult<Cow<'de, [u8]>> {
|
|
self.next_atomic(AtomMinor::ByteString, ExpectedKind::Symbol)
|
|
}
|
|
|
|
fn next_symbol(&mut self) -> ReaderResult<Cow<'de, str>> {
|
|
Ok(decodestr(self.next_atomic(AtomMinor::Symbol, ExpectedKind::Symbol)?)?)
|
|
}
|
|
}
|
|
|
|
struct ConfiguredBinaryReader<'de, 'a, S: BinarySource<'de>> {
|
|
reader: &'a mut BinaryReader<'de, S>,
|
|
read_annotations: bool,
|
|
phantom: PhantomData<&'de ()>,
|
|
}
|
|
|
|
struct CountedStream<'de, 'a, S: BinarySource<'de>> {
|
|
reader: ConfiguredBinaryReader<'de, 'a, S>,
|
|
count: usize,
|
|
}
|
|
|
|
impl<'de, 'a, S: BinarySource<'de>> Iterator for CountedStream<'de, 'a, S>
|
|
{
|
|
type Item = IOResult<IOValue>;
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
if self.count == 0 { return None }
|
|
self.count -= 1;
|
|
Some(self.reader.reader.demand_next(self.reader.read_annotations))
|
|
}
|
|
}
|
|
|
|
struct DelimitedStream<'de, 'a, S: BinarySource<'de>> {
|
|
reader: ConfiguredBinaryReader<'de, 'a, S>,
|
|
}
|
|
|
|
impl<'de, 'a, S: BinarySource<'de>> Iterator for DelimitedStream<'de, 'a, S>
|
|
{
|
|
type Item = IOResult<IOValue>;
|
|
fn next(&mut self) -> Option<Self::Item> {
|
|
match self.reader.reader.peekend() {
|
|
Err(e) => Some(Err(e)),
|
|
Ok(true) => None,
|
|
Ok(false) => Some(self.reader.reader.demand_next(self.reader.read_annotations)),
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn decodeop(b: u8) -> IOResult<(Op, u8)> {
|
|
Ok((Op::try_from(b >> 4)?, b & 15))
|
|
}
|
|
|
|
pub fn decodestr<'de>(cow: Cow<'de, [u8]>) -> IOResult<Cow<'de, str>> {
|
|
match cow {
|
|
Cow::Borrowed(bs) =>
|
|
Ok(Cow::Borrowed(std::str::from_utf8(bs).map_err(|_| io_syntax_error("Invalid UTF-8"))?)),
|
|
Cow::Owned(bs) =>
|
|
Ok(Cow::Owned(String::from_utf8(bs).map_err(|_| io_syntax_error("Invalid UTF-8"))?.to_owned())),
|
|
}
|
|
}
|
|
|
|
pub fn decodebinary<'de>(minor: AtomMinor, bs: Cow<'de, [u8]>) -> IOResult<IOValue> {
|
|
Ok(match minor {
|
|
AtomMinor::SignedInteger => Value::from(&BigInt::from_signed_bytes_be(&bs)).wrap(),
|
|
AtomMinor::String => Value::String(decodestr(bs)?.into_owned()).wrap(),
|
|
AtomMinor::ByteString => Value::ByteString(bs.into_owned()).wrap(),
|
|
AtomMinor::Symbol => Value::Symbol(decodestr(bs)?.into_owned()).wrap(),
|
|
})
|
|
}
|
|
|
|
pub fn decodecompound<'de, I: Iterator<Item = IOResult<IOValue>>>(
|
|
minor: CompoundMinor,
|
|
mut iter: I
|
|
) ->
|
|
IOResult<IOValue>
|
|
{
|
|
match minor {
|
|
CompoundMinor::Record => {
|
|
let vs = iter.collect::<IOResult<Vec<IOValue>>>()?;
|
|
if vs.len() < 1 {
|
|
Err(io_syntax_error("Too few elements in encoded record"))
|
|
} else {
|
|
Ok(Value::Record(Record(vs)).wrap())
|
|
}
|
|
}
|
|
CompoundMinor::Sequence => {
|
|
let vs = iter.collect::<IOResult<Vec<IOValue>>>()?;
|
|
Ok(Value::Sequence(vs).wrap())
|
|
}
|
|
CompoundMinor::Set => {
|
|
let mut s = Set::new();
|
|
for res in iter { s.insert(res?); }
|
|
Ok(Value::Set(s).wrap())
|
|
}
|
|
CompoundMinor::Dictionary => {
|
|
let mut d = Map::new();
|
|
while let Some(kres) = iter.next() {
|
|
let k = kres?;
|
|
match iter.next() {
|
|
Some(vres) => {
|
|
let v = vres?;
|
|
d.insert(k, v);
|
|
}
|
|
None => return Err(io_syntax_error("Missing dictionary value")),
|
|
}
|
|
}
|
|
Ok(Value::Dictionary(d).wrap())
|
|
}
|
|
}
|
|
}
|