diff options
Diffstat (limited to 'src/dstream')
-rw-r--r-- | src/dstream/mod.rs | 59 |
1 files changed, 15 insertions, 44 deletions
diff --git a/src/dstream/mod.rs b/src/dstream/mod.rs index a9cfa89..ca7f619 100644 --- a/src/dstream/mod.rs +++ b/src/dstream/mod.rs @@ -19,15 +19,13 @@ // er General Public License along with bzipper. If // not, see <https://www.gnu.org/licenses/>. -use crate::{Error, Result, Sstream}; +use crate::{Error, Result}; -use std::fmt::{Debug, Formatter}; +use core::fmt::{Debug, Formatter}; /// Byte stream for deserialisation. /// /// This type borrows a byte slice (hence [`new`](Dstream::new)), keeping track internally of the used bytes. -/// -/// The stream may be converted to an [`Sstream`] using [`to_sstream`](Dstream::to_sstream). #[derive(Clone)] pub struct Dstream<'a> { data: &'a [u8], @@ -47,15 +45,16 @@ impl<'a> Dstream<'a> { /// /// # Errors /// - /// If the internal buffer doesn't hold at least the requested ammount of bytes, an [`EndOfDStream`](Error::EndOfDStream) error is returned. - pub fn take(&mut self, len: usize) -> Result<&[u8]> { - if self.len < len { return Err(Error::EndOfDStream { req: len, rem: self.len } ) } + /// If the internal buffer doesn't hold at least the requested amount of bytes, an [`EndOfStream`](Error::EndOfStream) error is returned. + pub fn take(&mut self, req: usize) -> Result<&[u8]> { + let rem = self.len; - let start = self.data.len() - self.len; - let stop = start + len; + if rem < req { return Err(Error::EndOfStream { req, rem } ) } - self.len -= len; + let start = self.data.len() - rem; + let stop = start + req; + self.len -= req; Ok(&self.data[start..stop]) } @@ -63,53 +62,25 @@ impl<'a> Dstream<'a> { /// /// # Errors /// - /// If the internal buffer doesn't hold at least the requested ammount of bytes, an [`EndOfDStream`](Error::EndOfDStream) error is returned. + /// If the internal buffer doesn't hold at least the requested amount of bytes, an [`EndOfStream`](Error::EndOfStream) error is returned. pub fn take_byte(&mut self) -> Result<u8> { const LEN: usize = 0x1; - if self.len < LEN { return Err(Error::EndOfDStream { req: LEN, rem: self.len } ) } + if self.len < LEN { return Err(Error::EndOfStream { req: LEN, rem: self.len } ) } self.len -= LEN; let index = self.data.len() - self.len; Ok(self.data[index]) } - - /// Takes a slice of the remaining data. - #[must_use] - pub fn as_slice(&self) -> &[u8] { - let stop = self.data.len(); - let start = stop - self.len; - - &self.data[start..stop] - } - - /// Converts the stream to a `Sstream` object. - /// - /// The returned object owns a copy of the remaining data. - #[inline(always)] - #[must_use] - pub fn to_sstream(&self) -> Sstream { - Sstream(self.as_slice().to_vec()) - } } impl Debug for Dstream<'_> { - fn fmt(&self, f: &mut Formatter) -> std::fmt::Result { - write!(f, "[")?; - - for v in self.as_slice() { write!(f, "{v:#02X},")? }; - - write!(f, "]")?; - - Ok(()) + fn fmt(&self, f: &mut Formatter) -> core::fmt::Result { + self.data.fmt(f) } } -impl<'a> From<&'a [u8]> for Dstream<'a> { - fn from(value: &'a [u8]) -> Self { Self::new(value) } -} - -impl<'a, const N: usize> From<&'a [u8; N]> for Dstream<'a> { - fn from(value: &'a [u8; N]) -> Self { Self::new(value) } +impl<'a, T: AsRef<[u8]>> From<&'a T> for Dstream<'a> { + fn from(value: &'a T) -> Self { Self::new(value) } } |