Struct BerReader 

pub struct BerReader<'a> { /* private fields */ }

A BER reader that decodes TLV elements from a byte slice.

Implementations

impl<'a> BerReader<'a>

pub fn new(buf: &'a [u8]) -> Self

Creates a new reader over the given buffer.

pub fn pos(&self) -> usize

Returns the current read position.

pub fn remaining(&self) -> usize

Returns the remaining unread bytes.

pub fn is_empty(&self) -> bool

Returns true if all bytes have been consumed.

pub fn peek_tag(&self) -> Result<(u8, Class, bool), SleError>

Peeks at the next tag without advancing the position. Returns (tag_number, class, constructed).

pub fn read_tag(&mut self) -> Result<(u8, Class, bool), SleError>

Reads and validates a tag, returning its components.

pub fn read_length(&mut self) -> Result<usize, SleError>

Reads a length field.

pub fn read_raw(&mut self, len: usize) -> Result<&'a [u8], SleError>

Reads raw bytes of the given length.

pub fn read_bool(&mut self) -> Result<bool, SleError>

Reads an ASN.1 BOOLEAN.

pub fn read_integer(&mut self) -> Result<i64, SleError>

Reads an ASN.1 INTEGER as i64.

pub fn read_octet_string(&mut self) -> Result<&'a [u8], SleError>

Reads an ASN.1 OCTET STRING, returning the raw bytes.

pub fn read_enum(&mut self) -> Result<i64, SleError>

Reads an ASN.1 ENUMERATED as i64.

pub fn read_null(&mut self) -> Result<(), SleError>

Reads an ASN.1 NULL.

pub fn read_sequence(&mut self) -> Result<usize, SleError>

Reads a SEQUENCE tag+length, returning the content length. The caller should then read the contained elements.

pub fn read_context_tag(&mut self) -> Result<(u8, usize), SleError>

Reads a context-tagged wrapper, returning the tag number and content length.

pub fn sub_reader(&mut self, len: usize) -> Result<BerReader<'a>, SleError>

Creates a sub-reader limited to len bytes from the current position, advancing past them.