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Add encode_to_fmt method for efficient encoding #30

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Add encode_to_fmt method for efficient encoding #30

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29 changes: 18 additions & 11 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -226,19 +226,26 @@ impl Bech32 {
}
}

/// Encode a bech32 payload to an [fmt::Formatter].
pub fn encode_to_fmt<T: AsRef<[u5]>>(fmt: &mut fmt::Formatter, hrp: &str, data: T) -> fmt::Result {
let hrp_bytes: &[u8] = hrp.as_bytes();
let checksum = create_checksum(hrp_bytes, data.as_ref());
let data_part = data.as_ref().iter().chain(checksum.iter());

write!(
fmt,
"{}{}{}",
hrp,
SEP,
data_part
.map(|p| CHARSET[*p.as_ref() as usize])
.collect::<String>()
)
}

impl Display for Bech32 {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
let hrp_bytes: &[u8] = self.hrp.as_bytes();
let checksum = create_checksum(hrp_bytes, &self.data);
let data_part = self.data.iter().chain(checksum.iter());

write!(
f,
"{}{}{}",
self.hrp,
SEP,
data_part.map(|p| CHARSET[*p.as_ref() as usize]).collect::<String>()
)
encode_to_fmt(f, &self.hrp, &self.data)
}
}

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