Struct ConfigEntry 

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

A single configuration entry reference (zero-copy, no_std compatible).

Configuration entries follow DNS-SD TXT record format:

• Key-only (boolean flag): "enabled"
• Key with empty value: "name="
• Key with value: "version=1.0"

Keys must be printable US-ASCII (0x20-0x7E) excluding ‘=’.

Implementations

impl<'a> ConfigEntry<'a>

pub fn new(key: &'a str, value: Option<&'a str>) -> Result<Self, ConfigError>

Create a new entry with a key and optional value.

Parameters

• key - The entry key (printable ASCII, no ‘=’)
• value - None for boolean flag, Some(str) for key=value

Returns

• Ok(ConfigEntry) if key is valid
• Err(ConfigError::InvalidKey) if key is malformed

pub fn flag(key: &'a str) -> Result<Self, ConfigError>

Create a boolean flag entry (key only, no value).

Parameters

• key - The flag name

Returns

• Ok(ConfigEntry) if key is valid
• Err(ConfigError::InvalidKey) if key is malformed

pub fn with_value(key: &'a str, value: &'a str) -> Result<Self, ConfigError>

Create an entry with a value.

Parameters

• key - The entry key
• value - The entry value

Returns

• Ok(ConfigEntry) if key is valid
• Err(ConfigError::InvalidKey) if key is malformed

pub fn key(&self) -> &'a str

Get the entry key.

Returns

The key string slice

pub fn value(&self) -> Option<&'a str>

Get the entry value if present.

Returns

• None if this is a boolean flag
• Some("") if key ends with ‘=’
• Some(value) if key=value

pub fn is_flag(&self) -> bool

Check if this is a boolean flag (no value).

Returns

True if entry is key-only, false if key=value

pub fn from_str(s: &'a str) -> Result<Self, ConfigError>

Parse a configuration entry from a string (without length byte).

Parameters

• s - The string to parse (e.g., “key=value” or “flag”)

Returns

• Ok(ConfigEntry) if parse succeeds
• Err(ConfigError) if format is invalid

pub fn write_to(&self, buf: &mut [u8]) -> Result<usize, ConfigError>

Write entry to buffer (without length prefix).

Parameters

• buf - The buffer to write into

Returns

• Ok(usize) - Number of bytes written
• Err(ConfigError::BufferTooSmall) if buffer is insufficient

pub fn wire_size(&self) -> usize

Calculate wire format size (without length prefix).

Returns

Number of bytes needed for the entry data (excluding length byte)

Trait Implementations

impl<'a> Clone for ConfigEntry<'a>

fn clone(&self) -> ConfigEntry<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for ConfigEntry<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> PartialEq for ConfigEntry<'a>

fn eq(&self, other: &ConfigEntry<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> Copy for ConfigEntry<'a>

impl<'a> Eq for ConfigEntry<'a>

impl<'a> StructuralPartialEq for ConfigEntry<'a>