pub trait Reader<'r>: Sized {
Show 18 methods
fn input_len(&self) -> Length;
fn peek_byte(&self) -> Option<u8>;
fn peek_header(&self) -> Result<Header>;
fn position(&self) -> Length;
fn read_slice(&mut self, len: Length) -> Result<&'r [u8]>;
fn context_specific<T>(
&mut self,
tag_number: TagNumber,
tag_mode: TagMode
) -> Result<Option<T>>
where
T: DecodeValue<'r> + FixedTag,
{ ... }
fn decode<T: Decode<'r>>(&mut self) -> Result<T> { ... }
fn error(&mut self, kind: ErrorKind) -> Error { ... }
fn finish<T>(self, value: T) -> Result<T> { ... }
fn is_finished(&self) -> bool { ... }
fn offset(&self) -> Length { ... }
fn peek_tag(&self) -> Result<Tag> { ... }
fn read_byte(&mut self) -> Result<u8> { ... }
fn read_into<'o>(&mut self, buf: &'o mut [u8]) -> Result<&'o [u8]> { ... }
fn read_nested<'n, T, F>(&'n mut self, len: Length, f: F) -> Result<T>
where
F: FnOnce(&mut NestedReader<'n, Self>) -> Result<T>,
{ ... }
fn read_vec(&mut self, len: Length) -> Result<Vec<u8>> { ... }
fn remaining_len(&self) -> Length { ... }
fn tlv_bytes(&mut self) -> Result<&'r [u8]> { ... }
}
Expand description
Reader trait which reads DER-encoded input.
Required Methods
fn peek_header(&self) -> Result<Header>
fn peek_header(&self) -> Result<Header>
Peek forward in the input data, attempting to decode a Header
from
the data at the current position in the decoder.
Does not modify the decoder’s state.
Attempt to read data borrowed directly from the input as a slice, updating the internal cursor position.
Returns
Ok(slice)
on successErr(ErrorKind::Incomplete)
if there is not enough dataErr(ErrorKind::Reader)
if the reader can’t borrow from the input
Provided Methods
fn context_specific<T>(
&mut self,
tag_number: TagNumber,
tag_mode: TagMode
) -> Result<Option<T>> where
T: DecodeValue<'r> + FixedTag,
fn context_specific<T>(
&mut self,
tag_number: TagNumber,
tag_mode: TagMode
) -> Result<Option<T>> where
T: DecodeValue<'r> + FixedTag,
Attempt to decode an ASN.1 CONTEXT-SPECIFIC
field with the
provided TagNumber
.
Return an error with the given ErrorKind
, annotating it with
context about where the error occurred.
Finish decoding, returning the given value if there is no remaining data, or an error otherwise
fn is_finished(&self) -> bool
fn is_finished(&self) -> bool
Have we read all of the input data?
Offset within the original input stream.
This is used for error reporting, and doesn’t need to be overridden
by any reader implementations (except for the built-in NestedReader
,
which consumes nested input messages)
Peek at the next byte in the decoder and attempt to decode it as a
Tag
value.
Does not modify the decoder’s state.
Attempt to read input data, writing it into the provided buffer, and returning a slice on success.
Returns
Ok(slice)
if there is sufficient dataErr(ErrorKind::Incomplete)
if there is not enough data
Read nested data of the given length.
alloc
only.Read a byte vector of the given length.
fn remaining_len(&self) -> Length
fn remaining_len(&self) -> Length
Get the number of bytes still remaining in the buffer.