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use data::Datum; use marker::Marker; use reader::Read; #[derive (Clone, Debug)] pub struct SliceDatum { content: &'static [u8] } pub struct SliceReader { pub pointer: usize, pub content: SliceDatum } impl SliceReader { pub fn new (slice: &'static [u8]) -> SliceReader { SliceReader { pointer: 0, content: SliceDatum { content: slice } } } } impl Read for SliceReader { type Datum = SliceDatum; #[inline (always)] fn consume (&mut self, len: u8) -> Marker { let len = self.skip (len); Marker::new ((0, self.pointer - len as usize), (0, self.pointer)) } fn consume_long (&mut self, len: usize) -> Marker { let len = self.skip_long (len); Marker::new ((0, self.pointer - len), (0, self.pointer)) } fn get_datum (&mut self, index: usize) -> Option<SliceDatum> { if index == 0 { Some ( self.content.clone () ) } else { None } } fn skip (&mut self, len: u8) -> u8 { if self.pointer < self.content.content.len () { if self.pointer + (len as usize) < self.content.content.len () { self.pointer += len as usize; len } else { let len = self.content.content.len () - self.pointer; self.pointer += len; len as u8 } } else { 0 } } fn skip_long (&mut self, len: usize) -> usize { if self.pointer < self.content.content.len () { if self.pointer + len < self.content.content.len () { self.pointer += len; len } else { let len = self.content.content.len () - self.pointer; self.pointer += len; len } } else { 0 } } #[inline (always)] fn has (&mut self, len: u8) -> bool { self.pointer + len as usize <= self.content.content.len () } #[inline (always)] fn has_long (&mut self, len: usize) -> bool { self.pointer + len <= self.content.content.len () } #[inline (always)] fn byte_at_start (&mut self, byte: u8) -> bool { self.content.content.get (self.pointer) == Some (&byte) } #[inline (always)] fn byte_at (&mut self, byte: u8, at: usize) -> bool { self.content.content.get (self.pointer + at) == Some (&byte) } #[inline (always)] fn bytes_2_at_start (&mut self, bytes: [u8; 2]) -> bool { self.content.content.get (self.pointer .. self.pointer + 2) == Some (&bytes) } #[inline (always)] fn bytes_2_at (&mut self, bytes: [u8; 2], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 2) == Some (&bytes) } #[inline (always)] fn bytes_3_at_start (&mut self, bytes: [u8; 3]) -> bool { self.content.content.get (self.pointer .. self.pointer + 3) == Some (&bytes) } #[inline (always)] fn bytes_3_at (&mut self, bytes: [u8; 3], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 3) == Some (&bytes) } #[inline (always)] fn bytes_4_at_start (&mut self, bytes: [u8; 4]) -> bool { self.content.content.get (self.pointer .. self.pointer + 4) == Some (&bytes) } #[inline (always)] fn bytes_4_at (&mut self, bytes: [u8; 4], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + 4) == Some (&bytes) } #[inline (always)] fn bytes_at_start (&mut self, bytes: &[u8]) -> bool { self.content.content.get (self.pointer .. self.pointer + bytes.len ()) == Some (bytes) } #[inline (always)] fn bytes_at (&mut self, bytes: &[u8], at: usize) -> bool { self.content.content.get (self.pointer + at .. self.pointer + at + bytes.len ()) == Some (bytes) } #[inline (always)] fn slice_at (&mut self, at: usize, len: usize) -> Option<&[u8]> { self.content.content.get (self.pointer + at .. self.pointer + at + len) } #[inline (always)] fn get_byte_at (&mut self, at: usize) -> Option<u8> { self.content.content.get (self.pointer + at).map (|b| *b) } #[inline (always)] fn get_byte_at_start (&mut self) -> Option<u8> { self.content.content.get (self.pointer).map (|b| *b) } #[inline (always)] fn get_bytes_2_at (&mut self, at: usize) -> Option<(u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 2).map (|ref bs| (bs[0], bs[1])) } #[inline (always)] fn get_bytes_2_at_start (&mut self) -> Option<(u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 2).map (|ref bs| (bs[0], bs[1])) } #[inline (always)] fn get_bytes_3_at (&mut self, at: usize) -> Option<(u8, u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 3).map (|ref bs| (bs[0], bs[1], bs[2])) } #[inline (always)] fn get_bytes_3_at_start (&mut self) -> Option<(u8, u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 3).map (|ref bs| (bs[0], bs[1], bs[2])) } #[inline (always)] fn get_bytes_4_at (&mut self, at: usize) -> Option<(u8, u8, u8, u8)> { self.content.content.get (self.pointer + at .. self.pointer + at + 4).map (|ref bs| (bs[0], bs[1], bs[2], bs[3])) } #[inline (always)] fn get_bytes_4_at_start (&mut self) -> Option<(u8, u8, u8, u8)> { self.content.content.get (self.pointer .. self.pointer + 4).map (|ref bs| (bs[0], bs[1], bs[2], bs[3])) } } impl Datum for SliceDatum { #[inline (always)] fn len (&self) -> usize { <[u8]>::len (self.content) } #[inline (always)] fn as_slice (&self) -> &[u8] { self.content } }