fixDecoderSize

function fixDecoderSize<TTo, TSize>(
    decoder,
    fixedBytes,
): FixedSizeDecoder<TTo, TSize>;

Creates a fixed-size decoder from a given decoder.

The resulting decoder always reads exactly fixedBytes bytes from the input. If the nested decoder is also fixed-size, the bytes are truncated or padded as needed.

For more details, see fixCodecSize.

Type Parameters

Type Parameter	Description
`TTo`	The type of the decoded value.
`TSize` extends `number`	The fixed size of the encoded value in bytes.

Parameters

Parameter	Type	Description
`decoder`	`Decoder`<`TTo`>	The decoder to wrap into a fixed-size decoder.
`fixedBytes`	`TSize`	The fixed number of bytes to read.

Returns

FixedSizeDecoder<TTo, TSize>

A FixedSizeDecoder that ensures a consistent input size.

Example

const decoder = fixDecoderSize(getUtf8Decoder(), 4);
decoder.decode(new Uint8Array([72, 101, 108, 108, 111])); // "Hell" (truncated)
decoder.decode(new Uint8Array([72, 105, 0, 0]));          // "Hi" (zeroes ignored)
decoder.decode(new Uint8Array([72, 105, 121, 97]));       // "Hiya" (same length)

Remarks

If you need a full codec with both encoding and decoding, use fixCodecSize.