AsnDecoder.TryDecodeLength Method

Definition

Namespace:

System.Formats.Asn1

Assembly:

System.Formats.Asn1.dll

Attempts to decode the data in source as a length value under the specified encoding rules.

public:
 static bool TryDecodeLength(ReadOnlySpan<System::Byte> source, System::Formats::Asn1::AsnEncodingRules ruleSet, [Runtime::InteropServices::Out] Nullable<int> % decodedLength, [Runtime::InteropServices::Out] int % bytesConsumed);

public static bool TryDecodeLength (ReadOnlySpan<byte> source, System.Formats.Asn1.AsnEncodingRules ruleSet, out int? decodedLength, out int bytesConsumed);

static member TryDecodeLength : ReadOnlySpan<byte> * System.Formats.Asn1.AsnEncodingRules * Nullable * int -> bool

Public Shared Function TryDecodeLength (source As ReadOnlySpan(Of Byte), ruleSet As AsnEncodingRules, ByRef decodedLength As Nullable(Of Integer), ByRef bytesConsumed As Integer) As Boolean

Parameters

source

ReadOnlySpan<Byte>

The buffer containing encoded data.

ruleSet

AsnEncodingRules

The encoding constraints to use when interpreting the data.

decodedLength

Nullable<Int32>

When this method returns, contains the decoded value of the length, or null if the encoded length represents the indefinite length. This parameter is treated as uninitialized.

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

Boolean

true if the buffer represents a valid length under the specified encoding rules; otherwise, false

Exceptions

ArgumentOutOfRangeException

ruleSet is not a known AsnEncodingRules value.

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.