AsnDecoder.DecodeLength Method
Definition
Important
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Decodes the data in source as a length value under the specified
encoding rules.
public:
static Nullable<int> DecodeLength(ReadOnlySpan<System::Byte> source, System::Formats::Asn1::AsnEncodingRules ruleSet, [Runtime::InteropServices::Out] int % bytesConsumed);public static int? DecodeLength(ReadOnlySpan<byte> source, System.Formats.Asn1.AsnEncodingRules ruleSet, out int bytesConsumed);static member DecodeLength : ReadOnlySpan<byte> * System.Formats.Asn1.AsnEncodingRules * int -> Nullable<int>Public Shared Function DecodeLength (source As ReadOnlySpan(Of Byte), ruleSet As AsnEncodingRules, ByRef bytesConsumed As Integer) As Nullable(Of Integer)Parameters
- source
- ReadOnlySpan<Byte>
The buffer containing encoded data.
- ruleSet
- AsnEncodingRules
The encoding constraints to use when interpreting the data.
- bytesConsumed
- Int32
When this method returns, contains the number of bytes from the beginning of source
that contributed to the length.
This parameter is treated as uninitialized.
Returns
The decoded value of the length, or null if the
encoded length represents the indefinite length.
Exceptions
ruleSet is not a known AsnEncodingRules value.
source does not decode as a length under the specified encoding rules.
Remarks
This method only processes the length portion of an ASN.1/BER Tag-Length-Value triplet, so source needs to have already sliced off the encoded tag.
