data-rw 1.6.4

io buffer write reader.
Documentation 
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use crate::{DataReader, ReadNumberFixed, ReadNumberVar};
use anyhow::{ensure, Result};
use std::ops::Deref;

#[derive(Debug)]
pub struct DataOwnedReader {
    pub(crate) inner: Vec<u8>,
    pub(crate) offset: usize,
}

impl DataOwnedReader {
    #[inline]
    pub fn new(inner: Vec<u8>) -> DataOwnedReader {
        DataOwnedReader { inner, offset: 0 }
    }

    #[inline]
    pub fn into_inner(self) -> Vec<u8> {
        self.inner
    }
    #[inline]
    pub fn get_reader(&self) -> DataReader {
        DataReader::from(&self.inner[self.offset..])
    }

    #[inline]
    pub fn get_all_reader(&self) -> DataReader {
        DataReader::from(&self.inner[..])
    }
    #[inline]
    pub fn get_offset(&self) -> usize {
        self.offset
    }

    #[inline]
    pub fn set_offset(&mut self, offset: usize) -> Result<()> {
        ensure!(offset <= self.inner.len(), "offset big too");
        self.offset = offset;
        Ok(())
    }

    #[inline]
    pub fn add_offset(&mut self, offset: usize) -> Result<usize> {
        ensure!(self.offset + offset <= self.inner.len(), "offset big too");
        self.offset += offset;
        Ok(self.offset)
    }
    #[inline]
    pub fn sub_offset(&mut self, offset: usize) -> Result<usize> {
        ensure!(self.offset - offset > 0, "offset min too");
        self.offset -= offset;
        Ok(self.offset)
    }

    #[inline]
    pub fn read_fixed<T: ReadNumberFixed>(&mut self) -> Result<T> {
        let mut dr = self.get_reader();
        let v = dr.read_fixed()?;
        self.offset += dr.offset();
        Ok(v)
    }

    #[inline]
    pub fn read_var_integer<T: ReadNumberVar>(&mut self) -> Result<T> {
        let mut dr = self.get_reader();
        let v = dr.read_var_integer()?;
        self.offset += dr.offset();
        Ok(v)
    }

    #[inline]
    pub fn read_fixed_buf(&mut self) -> Result<&[u8]> {
        let mut dr = DataReader::from(&self.inner[self.offset..]);
        let x = dr.read_fixed_buf()?;
        self.offset += dr.offset();
        Ok(x)
    }

    #[inline]
    pub fn read_var_buf(&mut self) -> Result<&[u8]> {
        let mut dr = DataReader::from(&self.inner[self.offset..]);
        let x = dr.read_var_buf()?;
        self.offset += dr.offset();
        Ok(x)
    }

    #[inline]
    pub fn read_fixed_str(&mut self) -> Result<&str> {
        let mut dr = DataReader::from(&self.inner[self.offset..]);
        let x = dr.read_fixed_str()?;
        self.offset += dr.offset();
        Ok(x)
    }

    #[inline]
    pub fn read_var_str(&mut self) -> Result<&str> {
        let mut dr = DataReader::from(&self.inner[self.offset..]);
        let x = dr.read_var_str()?;
        self.offset += dr.offset();
        Ok(x)
    }

    #[inline]
    pub fn read_buff(&mut self, buff: &mut [u8]) -> Result<()> {
        let mut dr = DataReader::from(&self.inner[self.offset..]);
        dr.read_buff(buff)?;
        self.offset += dr.offset();
        Ok(())
    }
}

impl Deref for DataOwnedReader {
    type Target = [u8];

    #[inline]
    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl AsRef<[u8]> for DataOwnedReader {
    #[inline]
    fn as_ref(&self) -> &[u8] {
        &self.inner
    }
}