Make encode_varint use a generic Writer
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parent
da81b741a3
commit
cf4821599e
122
src/ebml.rs
122
src/ebml.rs
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@ -1,4 +1,7 @@
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use bytes::{BigEndian, ByteOrder, BufMut};
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use std::error::Error as ErrorTrait;
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use std::fmt::{Display, Formatter, Result as FmtResult};
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use std::io::{Cursor, Error as IoError, ErrorKind, Result as IoResult, Write};
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pub const EBML_HEAD_ID: u64 = 0x0A45DFA3;
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pub const VOID_ID: u64 = 0x6C;
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@ -13,8 +16,21 @@ pub enum Error {
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#[derive(Debug, PartialEq)]
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pub enum WriteError {
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BufferTooSmall,
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OutOfRange,
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OutOfRange
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}
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impl Display for WriteError {
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fn fmt(&self, f: &mut Formatter) -> FmtResult {
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match self {
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&WriteError::OutOfRange => write!(f, "EBML Varint out of range")
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}
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}
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}
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impl ErrorTrait for WriteError {
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fn description(&self) -> &str {
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match self {
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&WriteError::OutOfRange => "EBML Varint out of range"
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}
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}
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}
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#[derive(Debug, PartialEq)]
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@ -113,12 +129,12 @@ const SMALL_FLAG: u64 = 0x80;
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const EIGHT_FLAG: u64 = 0x01 << (8*7);
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const EIGHT_MAX: u64 = EIGHT_FLAG - 2;
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/// Tries to write an EBML varint to the buffer
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pub fn encode_varint<T: BufMut>(varint: Varint, buffer: &mut T) -> Result<usize, WriteError> {
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/// Tries to write an EBML varint
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pub fn encode_varint<T: Write>(varint: Varint, output: &mut T) -> IoResult<usize> {
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let (size, number) = match varint {
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Varint::Unknown => (1, 0xFF),
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Varint::Value(too_big) if too_big > EIGHT_MAX => {
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return Err(WriteError::OutOfRange)
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return Err(IoError::new(ErrorKind::InvalidInput, WriteError::OutOfRange))
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},
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Varint::Value(value) => {
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let mut flag = SMALL_FLAG;
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@ -135,12 +151,10 @@ pub fn encode_varint<T: BufMut>(varint: Varint, buffer: &mut T) -> Result<usize,
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}
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};
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if buffer.remaining_mut() < size {
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Err(WriteError::BufferTooSmall)
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} else {
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buffer.put_uint::<BigEndian>(number, size);
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Ok(size)
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}
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let mut buffer = Cursor::new([0; 8]);
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buffer.put_uint::<BigEndian>(number, size);
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return output.write_all(&buffer.get_ref()[..size]).map(|()| size);
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}
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#[derive(Debug, PartialEq)]
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@ -186,7 +200,7 @@ pub trait Schema<'a> {
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#[cfg(test)]
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mod tests {
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use bytes::{BytesMut, Buf};
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use bytes::{BytesMut};
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use ebml::*;
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use ebml::Error::{CorruptVarint, UnknownElementId};
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use ebml::Varint::{Unknown, Value};
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@ -220,69 +234,69 @@ mod tests {
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#[test]
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fn encode_varints() {
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let mut buffer = BytesMut::with_capacity(10);
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let mut buffer = BytesMut::with_capacity(10).writer();
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let mut no_space = Cursor::new([0; 0]);
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assert_eq!(no_space.remaining_mut(), 0);
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let mut no_space = Cursor::new([0; 0]).writer();
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assert_eq!(no_space.get_ref().remaining_mut(), 0);
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let mut six_buffer = Cursor::new([0; 6]);
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assert_eq!(six_buffer.remaining_mut(), 6);
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let mut six_buffer = Cursor::new([0; 6]).writer();
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assert_eq!(six_buffer.get_ref().remaining_mut(), 6);
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// 1 byte
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assert_eq!(encode_varint(Varint::Unknown, &mut buffer), Ok(1));
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assert_eq!(buffer.split_to(1), &[0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Unknown, &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Unknown, &mut buffer).unwrap(), 1);
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assert_eq!(buffer.get_mut().split_to(1), &[0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Unknown, &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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assert_eq!(encode_varint(Varint::Value(0), &mut buffer), Ok(1));
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assert_eq!(buffer.split_to(1), &[0x80 | 0].as_ref());
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assert_eq!(encode_varint(Varint::Value(0), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(0), &mut buffer).unwrap(), 1);
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assert_eq!(buffer.get_mut().split_to(1), &[0x80 | 0].as_ref());
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assert_eq!(encode_varint(Varint::Value(0), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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assert_eq!(encode_varint(Varint::Value(1), &mut buffer), Ok(1));
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assert_eq!(buffer.split_to(1), &[0x80 | 1].as_ref());
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assert_eq!(encode_varint(Varint::Value(1), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(1), &mut buffer).unwrap(), 1);
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assert_eq!(buffer.get_mut().split_to(1), &[0x80 | 1].as_ref());
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assert_eq!(encode_varint(Varint::Value(1), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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assert_eq!(encode_varint(Varint::Value(126), &mut buffer), Ok(1));
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assert_eq!(buffer.split_to(1), &[0xF0 | 126].as_ref());
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assert_eq!(encode_varint(Varint::Value(126), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(126), &mut buffer).unwrap(), 1);
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assert_eq!(buffer.get_mut().split_to(1), &[0xF0 | 126].as_ref());
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assert_eq!(encode_varint(Varint::Value(126), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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// 2 bytes
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assert_eq!(encode_varint(Varint::Value(127), &mut buffer), Ok(2));
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assert_eq!(&buffer.split_to(2), &[0x40, 127].as_ref());
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assert_eq!(encode_varint(Varint::Value(127), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(127), &mut buffer).unwrap(), 2);
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assert_eq!(&buffer.get_mut().split_to(2), &[0x40, 127].as_ref());
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assert_eq!(encode_varint(Varint::Value(127), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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assert_eq!(encode_varint(Varint::Value(128), &mut buffer), Ok(2));
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assert_eq!(&buffer.split_to(2), &[0x40, 128].as_ref());
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assert_eq!(encode_varint(Varint::Value(128), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(128), &mut buffer).unwrap(), 2);
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assert_eq!(&buffer.get_mut().split_to(2), &[0x40, 128].as_ref());
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assert_eq!(encode_varint(Varint::Value(128), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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// 6 bytes
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assert_eq!(six_buffer.remaining_mut(), 6);
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assert_eq!(encode_varint(Varint::Value(0x03FFFFFFFFFE), &mut six_buffer), Ok(6));
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assert_eq!(six_buffer.remaining_mut(), 0);
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assert_eq!(&six_buffer.get_ref(), &[0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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six_buffer = Cursor::new([0; 6]);
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assert_eq!(six_buffer.get_ref().remaining_mut(), 6);
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assert_eq!(encode_varint(Varint::Value(0x03FFFFFFFFFE), &mut six_buffer).unwrap(), 6);
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assert_eq!(six_buffer.get_ref().remaining_mut(), 0);
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assert_eq!(&six_buffer.get_ref().get_ref(), &[0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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six_buffer = Cursor::new([0; 6]).writer();
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// 7 bytes
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assert_eq!(encode_varint(Varint::Value(0x03FFFFFFFFFF), &mut buffer), Ok(7));
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assert_eq!(&buffer.split_to(7), &[0x02, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x03FFFFFFFFFF), &mut buffer).unwrap(), 7);
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assert_eq!(&buffer.get_mut().split_to(7), &[0x02, 0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01000000000000), &mut buffer), Ok(7));
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assert_eq!(&buffer.split_to(7), &[0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01000000000000), &mut buffer).unwrap(), 7);
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assert_eq!(&buffer.get_mut().split_to(7), &[0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut buffer), Ok(7));
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assert_eq!(&buffer.split_to(7), &[0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut buffer).unwrap(), 7);
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assert_eq!(&buffer.get_mut().split_to(7), &[0x03, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut no_space), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut six_buffer), Err(WriteError::BufferTooSmall));
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut no_space).unwrap_err().kind(), ErrorKind::WriteZero);
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFE), &mut six_buffer).unwrap_err().kind(), ErrorKind::WriteZero);
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// 8 bytes
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFF), &mut buffer), Ok(8));
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assert_eq!(&buffer.split_to(8), &[0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Value(0x01FFFFFFFFFFFF), &mut buffer).unwrap(), 8);
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assert_eq!(&buffer.get_mut().split_to(8), &[0x01, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF].as_ref());
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assert_eq!(encode_varint(Varint::Value(0xFFFFFFFFFFFFFE), &mut buffer), Ok(8));
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assert_eq!(&buffer.split_to(8), &[0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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assert_eq!(encode_varint(Varint::Value(0xFFFFFFFFFFFFFE), &mut buffer).unwrap(), 8);
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assert_eq!(&buffer.get_mut().split_to(8), &[0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE].as_ref());
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assert_eq!(encode_varint(Varint::Value(0xFFFFFFFFFFFFFF), &mut buffer), Err(WriteError::OutOfRange));
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assert_eq!(encode_varint(Varint::Value(u64::max_value()), &mut buffer), Err(WriteError::OutOfRange));
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assert_eq!(encode_varint(Varint::Value(0xFFFFFFFFFFFFFF), &mut buffer).unwrap_err().kind(), ErrorKind::InvalidInput);
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assert_eq!(encode_varint(Varint::Value(u64::max_value()), &mut buffer).unwrap_err().kind(), ErrorKind::InvalidInput);
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}
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#[test]
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