Struct HexCodec

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pub struct HexCodec { /* private fields */ }

Expand description

Encodes and decodes hexadecimal byte strings.

HexCodec is an owned facade for whole byte slices. Whole-string prefix, per-byte prefix, separator, and whitespace handling are part of encode and decode. Use crate::HexByteCodec when a low-level qubit_codec::Codec<Value = u8, Unit = u8> is required.

§Examples

use qubit_codec_misc::HexCodec;

let codec = HexCodec::new();
let encoded = codec.encode(&[0x1f, 0x8b]);
assert_eq!(encoded, "1f8b");
assert_eq!(codec.decode(&encoded).unwrap(), [0x1f, 0x8b]);

Implementations§

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impl HexCodec

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pub fn new() -> Self

Creates a lowercase codec without prefix or separators.

§Returns

A hexadecimal codec using lowercase digits.

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pub fn upper() -> Self

Creates an uppercase codec without prefix or separators.

§Returns

A hexadecimal codec using uppercase digits.

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pub fn from_config(config: HexCodecConfig) -> Self

Creates a codec from an explicit configuration.

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pub fn config(&self) -> &HexCodecConfig

Returns the configuration used by this codec.

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pub fn with_uppercase(self, uppercase: bool) -> Self

Sets whether encoded digits should be uppercase.

§Parameters

uppercase: Whether to use uppercase hexadecimal digits.

§Returns

The updated codec.

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pub fn with_prefix(self, prefix: impl Into<String>) -> Self

Sets a whole-output prefix.

The prefix is written once before the encoded bytes and required once before decoded input. For example, using prefix 0x encodes bytes as 0x1f8b.

§Parameters

prefix: Whole-output prefix text such as 0x.

§Returns

The updated codec.

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pub fn with_byte_prefix(self, prefix: impl Into<String>) -> Self

Sets a per-byte prefix.

The prefix is written before every encoded byte and required before every decoded byte. For example, using byte prefix 0x and separator encodes bytes as 0x1f 0x8b.

§Parameters

prefix: Per-byte prefix text such as 0x.

§Returns

The updated codec.

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pub fn with_separator(self, separator: impl Into<String>) -> Self

Sets a separator written and accepted between encoded bytes.

§Parameters

separator: Separator text.

§Returns

The updated codec.

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pub fn with_ignored_ascii_whitespace(self, ignore: bool) -> Self

Sets whether ASCII whitespace is ignored while decoding.

§Parameters

ignore: Whether to ignore ASCII whitespace.

§Returns

The updated codec.

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pub fn with_ignore_prefix_case(self, ignore: bool) -> Self

Sets whether ASCII case is ignored when decoding configured prefixes.

This option affects whole-output prefixes and per-byte prefixes during decoding only. Encoding writes prefixes exactly as configured.

§Parameters

ignore: Whether to ignore ASCII case while matching prefixes.

§Returns

The updated codec.

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pub fn encode(&self, bytes: &[u8]) -> String

Encodes bytes into a hexadecimal string.

§Parameters

bytes: Bytes to encode.

§Returns

Hexadecimal text.

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pub fn encode_into(&self, bytes: &[u8], output: &mut String)

Encodes bytes into an existing string.

§Parameters

bytes: Bytes to encode.
output: Destination string.

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pub fn decode(&self, text: &str) -> MiscCodecResult<Vec<u8>>

Decodes hexadecimal text into bytes.

§Parameters

text: Hexadecimal text.

§Returns

Decoded bytes.

§Errors

Returns MiscCodecError when a configured whole or per-byte prefix is missing, when the normalized digit count is odd, or when a non-hex digit is found.

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pub fn decode_into( &self, text: &str, output: &mut Vec<u8>, ) -> MiscCodecResult<()>

Decodes hexadecimal text into an existing byte vector.

§Parameters

text: Hexadecimal text.
output: Destination byte vector.

§Errors

Returns MiscCodecError when the input is malformed.

§TODO

This method currently decodes into a temporary vector before appending so that an error leaves output unchanged. A future optimization can decode directly into output with a checkpoint-and-rollback strategy, or validate and reserve in a first pass, to avoid the temporary vector while preserving transactional behavior.