33 lines
980 B
Rust
33 lines
980 B
Rust
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use deku::ctx::{Endian, Order};
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use deku::{DekuError, DekuWriter};
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use deku::prelude::{Reader, Writer};
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use deku::prelude::*;
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pub fn read_pascal_string<R>(reader: &mut Reader<R>) -> core::result::Result<String, DekuError>
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where
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R: deku::no_std_io::Read + deku::no_std_io::Seek,
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{
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let byte_len = u32::from_reader_with_ctx(reader, Endian::Little)? as usize;
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let mut bytes = vec![0u8; byte_len];
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reader.read_bytes(byte_len, &mut bytes, Order::Msb0)?;
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String::from_utf8(bytes).map_err(|err| DekuError::Parse(err.to_string().into()))
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}
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pub fn write_pascal_string<W>(
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writer: &mut Writer<W>,
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value: &String,
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) -> core::result::Result<(), DekuError>
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where
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W: deku::no_std_io::Write + deku::no_std_io::Seek,
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{
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let bytes = value.as_bytes();
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let byte_len =
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u32::try_from(bytes.len()).map_err(|_| DekuError::Parse("string too large".into()))?;
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byte_len.to_writer(writer, Endian::Little)?;
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writer.write_bytes(bytes)?;
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Ok(())
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}
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