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Remove option from current_chunk function signature
Public commit record
88/100 · Strong
What the developer wrote
Authored by Tobin C. Harding
Remove option from current_chunk function signature
The `Option` was observed to be pointless, we can just return the
empty list.
Note that the diff is noisy AF but there is basically no changes to
the test logic which confirms the observation.
(Andrew made the observation, Tobin needed tests to convince himself.)
✓ Specific, descriptive subject✓ Names a concrete action or component✓ Provides detailed explanatory context✓ Mentions testing or verification✓ Names security-relevant behavior explicitly
What changed, and why it matters
This commit is a routine internal code cleanup in the rust-bitcoin library. It changes an encoding helper function so that it returns an empty byte slice instead of a special 'no value' (None) marker when there is nothing left to encode. The behavior of the code is intended to stay the same; only the way callers check for the end of data is simplified. There is no indication this fixes a security bug.
Recommended action
No security action required. Treat as normal refactoring; review for API compatibility if downstream code depends on the previous `Option<&[u8]>` return type.
Security signals we found
No strong security signals were identified.
Evidence from the diff
The commit refactors the Encoder::current_chunk trait method from returning Option<&[u8]> to returning &[u8], using an empty slice (&[]) as the exhausted state instead of None. Implementations and call sites in consensus_encoding and primitives are updated to use .is_empty() rather than .is_some(). The diff is dominated by test assertion rewrites. No cryptographic, consensus, or serialization logic is changed; this is an API ergonomics refactor.
Changed components
consensus_encoding/src/encode/encoders.rsconsensus_encoding/src/encode/mod.rsconsensus_encoding/tests/composition.rsconsensus_encoding/tests/encode.rsprimitives/src/transaction.rsprimitives/src/witness.rsInspect captured patch +227 / −225
diff --git a/consensus_encoding/src/encode/encoders.rs b/consensus_encoding/src/encode/encoders.rs
index 4b617edf..691bffb1 100644
--- a/consensus_encoding/src/encode/encoders.rs
+++ b/consensus_encoding/src/encode/encoders.rs
@@ -30,7 +30,9 @@ impl<'sl> BytesEncoder<'sl> {
}
impl Encoder for BytesEncoder<'_> {
- fn current_chunk(&self) -> Option<&[u8]> { self.sl }
+ fn current_chunk(&self) -> &[u8] {
+ self.sl.unwrap_or_default()
+ }
fn advance(&mut self) -> bool {
self.sl = None;
@@ -50,7 +52,7 @@ impl<const N: usize> ArrayEncoder<N> {
impl<const N: usize> Encoder for ArrayEncoder<N> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.arr.as_ref().map(|x| &x[..]) }
+ fn current_chunk(&self) -> &[u8] { self.arr.as_ref().map(|x| &x[..]).unwrap_or_default() }
#[inline]
fn advance(&mut self) -> bool {
@@ -82,10 +84,9 @@ impl<'e, T: Encodable> SliceEncoder<'e, T> {
}
impl<T: Encodable> Encoder for SliceEncoder<'_, T> {
- fn current_chunk(&self) -> Option<&[u8]> {
+ fn current_chunk(&self) -> &[u8] {
// `advance` sets `cur_enc` to `None` once the slice encoder is completely exhausted.
- // `current_chunk` is required to return `None` if called after the encoder is exhausted.
- self.cur_enc.as_ref().and_then(T::Encoder::current_chunk)
+ self.cur_enc.as_ref().map(T::Encoder::current_chunk).unwrap_or_default()
}
fn advance(&mut self) -> bool {
@@ -105,7 +106,7 @@ impl<T: Encodable> Encoder for SliceEncoder<'_, T> {
// If advancing the current encoder failed, attempt to move to the next encoder.
if let Some(x) = self.sl.first() {
*cur = x.encoder();
- if cur.current_chunk().is_some() {
+ if !cur.current_chunk().is_empty() {
return true;
}
} else {
@@ -130,7 +131,7 @@ impl<A, B> Encoder2<A, B> {
impl<A: Encoder, B: Encoder> Encoder for Encoder2<A, B> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> {
+ fn current_chunk(&self) -> &[u8] {
if self.enc_idx == 0 {
self.enc_1.current_chunk()
} else {
@@ -170,7 +171,7 @@ impl<A, B, C> Encoder3<A, B, C> {
impl<A: Encoder, B: Encoder, C: Encoder> Encoder for Encoder3<A, B, C> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.inner.current_chunk() }
+ fn current_chunk(&self) -> &[u8] { self.inner.current_chunk() }
#[inline]
fn advance(&mut self) -> bool { self.inner.advance() }
}
@@ -189,7 +190,7 @@ impl<A, B, C, D> Encoder4<A, B, C, D> {
impl<A: Encoder, B: Encoder, C: Encoder, D: Encoder> Encoder for Encoder4<A, B, C, D> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.inner.current_chunk() }
+ fn current_chunk(&self) -> &[u8] { self.inner.current_chunk() }
#[inline]
fn advance(&mut self) -> bool { self.inner.advance() }
}
@@ -215,7 +216,7 @@ impl<A: Encoder, B: Encoder, C: Encoder, D: Encoder, E: Encoder, F: Encoder> Enc
for Encoder6<A, B, C, D, E, F>
{
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.inner.current_chunk() }
+ fn current_chunk(&self) -> &[u8] { self.inner.current_chunk() }
#[inline]
fn advance(&mut self) -> bool { self.inner.advance() }
}
@@ -232,7 +233,7 @@ impl CompactSizeEncoder {
impl Encoder for CompactSizeEncoder {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.buf.as_ref().map(|b| &b[..]) }
+ fn current_chunk(&self) -> &[u8] { self.buf.as_ref().map(|b| &b[..]).unwrap_or_default() }
#[inline]
fn advance(&mut self) -> bool {
@@ -272,9 +273,9 @@ mod tests {
// Should have one chunk with the array data, then exhausted.
let test_array = TestArray([1u8, 2, 3, 4]);
let mut encoder = test_array.encoder();
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3, 4][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3, 4][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -282,9 +283,9 @@ mod tests {
// Empty array should have one empty chunk, then exhausted.
let test_array = TestArray([]);
let mut encoder = test_array.encoder();
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -294,9 +295,9 @@ mod tests {
let test_bytes = TestBytes(&obj);
let mut encoder = test_bytes.encoder();
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -306,9 +307,9 @@ mod tests {
let test_bytes = TestBytes(&obj);
let mut encoder = test_bytes.encoder();
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -317,11 +318,11 @@ mod tests {
let slice = &[TestArray([0x34, 0x12, 0x00, 0x00]), TestArray([0x78, 0x56, 0x00, 0x00])];
let mut encoder = SliceEncoder::without_length_prefix(slice);
- assert_eq!(encoder.current_chunk(), Some(&[0x34, 0x12, 0x00, 0x00][..]));
+ assert_eq!(encoder.current_chunk(), &[0x34, 0x12, 0x00, 0x00][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x78, 0x56, 0x00, 0x00][..]));
+ assert_eq!(encoder.current_chunk(), &[0x78, 0x56, 0x00, 0x00][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -331,7 +332,7 @@ mod tests {
let mut encoder = SliceEncoder::without_length_prefix(slice);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -340,11 +341,12 @@ mod tests {
let slice = &[TestArray([]), TestArray([])];
let mut encoder = SliceEncoder::without_length_prefix(slice);
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
- assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
+ // FIXME: Its strange the we can't do this?
+ // assert!(encoder.advance());
+ // assert!(encoder.current_chunk().is_empty());
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -354,11 +356,11 @@ mod tests {
let enc2 = TestArray([3u8, 4]).encoder();
let mut encoder = Encoder2::new(enc1, enc2);
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8, 4][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8, 4][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -368,11 +370,11 @@ mod tests {
let enc2 = TestArray([]).encoder();
let mut encoder = Encoder2::new(enc1, enc2);
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -383,13 +385,13 @@ mod tests {
let enc3 = TestArray([4u8, 5u8, 6u8]).encoder();
let mut encoder = Encoder3::new(enc1, enc2, enc3);
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[2u8, 3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8, 3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[4u8, 5u8, 6u8][..]));
+ assert_eq!(encoder.current_chunk(), &[4u8, 5u8, 6u8][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -401,15 +403,15 @@ mod tests {
let enc4 = TestArray([0x40]).encoder();
let mut encoder = Encoder4::new(enc1, enc2, enc3, enc4);
- assert_eq!(encoder.current_chunk(), Some(&[0x10][..]));
+ assert_eq!(encoder.current_chunk(), &[0x10][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x20][..]));
+ assert_eq!(encoder.current_chunk(), &[0x20][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x30][..]));
+ assert_eq!(encoder.current_chunk(), &[0x30][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x40][..]));
+ assert_eq!(encoder.current_chunk(), &[0x40][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -423,19 +425,19 @@ mod tests {
let enc6 = TestArray([0x06]).encoder();
let mut encoder = Encoder6::new(enc1, enc2, enc3, enc4, enc5, enc6);
- assert_eq!(encoder.current_chunk(), Some(&[0x01][..]));
+ assert_eq!(encoder.current_chunk(), &[0x01][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x02][..]));
+ assert_eq!(encoder.current_chunk(), &[0x02][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x03][..]));
+ assert_eq!(encoder.current_chunk(), &[0x03][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x04][..]));
+ assert_eq!(encoder.current_chunk(), &[0x04][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x05][..]));
+ assert_eq!(encoder.current_chunk(), &[0x05][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x06][..]));
+ assert_eq!(encoder.current_chunk(), &[0x06][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -445,11 +447,11 @@ mod tests {
let enc2 = TestArray([0xDD, 0xCC]).encoder();
let mut encoder = Encoder2::new(enc1, enc2);
- assert_eq!(encoder.current_chunk(), Some(&[0xFF, 0xEE][..]));
+ assert_eq!(encoder.current_chunk(), &[0xFF, 0xEE][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xDD, 0xCC][..]));
+ assert_eq!(encoder.current_chunk(), &[0xDD, 0xCC][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -460,13 +462,13 @@ mod tests {
let enc3 = TestArray([0x43, 0x44, 0x45]).encoder();
let mut encoder = Encoder3::new(enc1, enc2, enc3);
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x42][..]));
+ assert_eq!(encoder.current_chunk(), &[0x42][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x43, 0x44, 0x45][..]));
+ assert_eq!(encoder.current_chunk(), &[0x43, 0x44, 0x45][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -477,13 +479,13 @@ mod tests {
let array_enc = TestArray([0x20, 0x21]).encoder();
let mut encoder = Encoder2::new(slice_enc, array_enc);
- assert_eq!(encoder.current_chunk(), Some(&[0x10, 0x11][..]));
+ assert_eq!(encoder.current_chunk(), &[0x10, 0x11][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x12, 0x13][..]));
+ assert_eq!(encoder.current_chunk(), &[0x12, 0x13][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x20, 0x21][..]));
+ assert_eq!(encoder.current_chunk(), &[0x20, 0x21][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -494,15 +496,15 @@ mod tests {
let slice_enc = SliceEncoder::without_length_prefix(slice);
let mut encoder = Encoder2::new(header, slice_enc);
- assert_eq!(encoder.current_chunk(), Some(&[0xFF, 0xFE][..]));
+ assert_eq!(encoder.current_chunk(), &[0xFF, 0xFE][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x01][..]));
+ assert_eq!(encoder.current_chunk(), &[0x01][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x02][..]));
+ assert_eq!(encoder.current_chunk(), &[0x02][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x03][..]));
+ assert_eq!(encoder.current_chunk(), &[0x03][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -517,21 +519,21 @@ mod tests {
let enc3 = SliceEncoder::without_length_prefix(slice3);
let mut encoder = Encoder3::new(enc1, enc2, enc3);
- assert_eq!(encoder.current_chunk(), Some(&[0xA1][..]));
+ assert_eq!(encoder.current_chunk(), &[0xA1][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xA2][..]));
+ assert_eq!(encoder.current_chunk(), &[0xA2][..]);
// Skip the empty slice
assert!(encoder.advance());
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xC1][..]));
+ assert_eq!(encoder.current_chunk(), &[0xC1][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xC2][..]));
+ assert_eq!(encoder.current_chunk(), &[0xC2][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xC3][..]));
+ assert_eq!(encoder.current_chunk(), &[0xC3][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -543,52 +545,58 @@ mod tests {
let footer = TestBytes(&[0xBE, 0xEF]).encoder();
let mut encoder = Encoder3::new(header, slice_enc, footer);
- assert_eq!(encoder.current_chunk(), Some(&[0xDE, 0xAD][..]));
+ assert_eq!(encoder.current_chunk(), &[0xDE, 0xAD][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x01, 0x02][..]));
+ assert_eq!(encoder.current_chunk(), &[0x01, 0x02][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0x03, 0x04][..]));
+ assert_eq!(encoder.current_chunk(), &[0x03, 0x04][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xBE, 0xEF][..]));
+ assert_eq!(encoder.current_chunk(), &[0xBE, 0xEF][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
fn encode_compact_size() {
// 1-byte
let mut e = CompactSizeEncoder::new(0x10u64);
- assert_eq!(e.current_chunk(), Some(&[0x10][..]));
+ assert_eq!(e.current_chunk(), &[0x10][..]);
assert!(!e.advance());
- assert_eq!(e.current_chunk(), None);
+ assert!(e.current_chunk().is_empty());
let mut e = CompactSizeEncoder::new(0xFCu64);
- assert_eq!(e.current_chunk(), Some(&[0xFC][..]));
+ assert_eq!(e.current_chunk(), &[0xFC][..]);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
// 0xFD + u16
let mut e = CompactSizeEncoder::new(0x00FDu64);
- assert_eq!(e.current_chunk(), Some(&[0xFD, 0xFD, 0x00][..]));
+ assert_eq!(e.current_chunk(), &[0xFD, 0xFD, 0x00][..]);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
let mut e = CompactSizeEncoder::new(0x0FFFu64);
- assert_eq!(e.current_chunk(), Some(&[0xFD, 0xFF, 0x0F][..]));
+ assert_eq!(e.current_chunk(), &[0xFD, 0xFF, 0x0F][..]);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
// 0xFE + u32
let mut e = CompactSizeEncoder::new(0x0001_0000u64);
- assert_eq!(e.current_chunk(), Some(&[0xFE, 0x00, 0x00, 0x01, 0x00][..]));
+ assert_eq!(e.current_chunk(), &[0xFE, 0x00, 0x00, 0x01, 0x00][..]);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
let mut e = CompactSizeEncoder::new(0x0F0F_0F0Fu64);
- assert_eq!(e.current_chunk(), Some(&[0xFE, 0x0F, 0x0F, 0x0F, 0x0F][..]));
+ assert_eq!(e.current_chunk(), &[0xFE, 0x0F, 0x0F, 0x0F, 0x0F][..]);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
// 0xFF + u64
let mut e = CompactSizeEncoder::new(0x0000_F0F0_F0F0_F0E0u64);
assert_eq!(
e.current_chunk(),
- Some(&[0xFF, 0xE0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x00, 0x00][..])
+ &[0xFF, 0xE0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0x00, 0x00][..]
);
assert!(!e.advance());
+ assert!(e.current_chunk().is_empty());
}
}
diff --git a/consensus_encoding/src/encode/mod.rs b/consensus_encoding/src/encode/mod.rs
index ecd34009..6e44e0ab 100644
--- a/consensus_encoding/src/encode/mod.rs
+++ b/consensus_encoding/src/encode/mod.rs
@@ -27,20 +27,19 @@ pub trait Encodable {
pub trait Encoder {
/// Yields the current encoded byteslice.
///
- /// Will always return the same value until [`Self::advance`] is called.
- ///
- /// Returns `None` if the encoder is exhausted. Once this method returns `None`,
- /// all subsequent calls will return `None`.
- fn current_chunk(&self) -> Option<&[u8]>;
+ /// Will always return the same value until [`Self::advance`] is called. May return an empty
+ /// list.
+ fn current_chunk(&self) -> &[u8];
/// Moves the encoder to its next state.
///
/// Does not need to be called when the encoder is first created. (In fact, if it
/// is called, this will discard the first chunk of encoded data.)
///
- /// Returns `true` if the next call to [`Self::current_chunk`] will return data.
- /// Returns `false` otherwise. It is fine to ignore the return value of this method
- /// and just call `current_chunk` to see if it works.
+ /// # Returns
+ ///
+ /// - `true` if the encoder has advanced to a new state and [`Self::current_chunk`] will return new data.
+ /// - `false` if the encoder is exhausted and has no more states.
fn advance(&mut self) -> bool;
}
@@ -57,7 +56,7 @@ macro_rules! encoder_newtype{
impl$(<$lt>)? $crate::Encoder for $name$(<$lt>)? {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.0.current_chunk() }
+ fn current_chunk(&self) -> &[u8] { self.0.current_chunk() }
#[inline]
fn advance(&mut self) -> bool { self.0.advance() }
@@ -75,9 +74,11 @@ where
H: hashes::HashEngine,
{
let mut encoder = object.encoder();
- while let Some(sl) = encoder.current_chunk() {
- engine.input(sl);
- encoder.advance();
+ loop {
+ engine.input(encoder.current_chunk());
+ if !encoder.advance() {
+ break;
+ }
}
engine
}
@@ -90,9 +91,11 @@ where
{
let mut encoder = object.encoder();
let mut vec = Vec::new();
- while let Some(chunk) = encoder.current_chunk() {
- vec.extend_from_slice(chunk);
- encoder.advance();
+ loop {
+ vec.extend_from_slice(encoder.current_chunk());
+ if !encoder.advance() {
+ break;
+ }
}
vec
}
@@ -116,18 +119,20 @@ where
W: std::io::Write,
{
let mut encoder = object.encoder();
- while let Some(chunk) = encoder.current_chunk() {
- writer.write_all(chunk)?;
- encoder.advance();
+ loop {
+ writer.write_all(encoder.current_chunk())?;
+ if !encoder.advance() {
+ break;
+ }
}
Ok(())
}
impl<T: Encoder> Encoder for Option<T> {
- fn current_chunk(&self) -> Option<&[u8]> {
+ fn current_chunk(&self) -> &[u8] {
match self {
Some(encoder) => encoder.current_chunk(),
- None => None,
+ None => &[],
}
}
diff --git a/consensus_encoding/tests/composition.rs b/consensus_encoding/tests/composition.rs
index e0cf3b02..34673559 100644
--- a/consensus_encoding/tests/composition.rs
+++ b/consensus_encoding/tests/composition.rs
@@ -88,9 +88,11 @@ fn composition_chain() {
// Encode using the pull encoder.
let mut encoder = original.encoder();
let mut encoded_bytes = Vec::new();
- while let Some(chunk) = encoder.current_chunk() {
- encoded_bytes.extend_from_slice(chunk);
- encoder.advance();
+ loop {
+ encoded_bytes.extend_from_slice(encoder.current_chunk());
+ if !encoder.advance() {
+ break;
+ }
}
// Decode using the push decoder.
let mut decoder = CompositeData::decoder();
@@ -115,9 +117,11 @@ fn composition_nested() {
);
let mut encoded_bytes = Vec::new();
- while let Some(chunk) = encoder6.current_chunk() {
- encoded_bytes.extend_from_slice(chunk);
- encoder6.advance();
+ loop {
+ encoded_bytes.extend_from_slice(encoder6.current_chunk());
+ if !encoder6.advance() {
+ break;
+ }
}
assert_eq!(encoded_bytes, data);
@@ -325,16 +329,16 @@ fn empty_encoders() {
BytesEncoder::without_length_prefix(&bytes[2..]),
);
- assert_eq!(encoder.current_chunk(), Some(&[1, 2][..]));
+ assert_eq!(encoder.current_chunk(), &[1, 2][..]);
assert!(encoder.advance());
// Still have to advance over empty slice.
- assert_eq!(encoder.current_chunk(), Some(&[][..]));
+ assert!(encoder.current_chunk().is_empty());
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3, 4][..]));
+ assert_eq!(encoder.current_chunk(), &[3, 4][..]);
assert!(!encoder.advance());
// Exhausted.
- assert!(encoder.current_chunk().is_none());
+ assert!(encoder.current_chunk().is_empty());
}
diff --git a/consensus_encoding/tests/encode.rs b/consensus_encoding/tests/encode.rs
index c6b157ce..d8f08d06 100644
--- a/consensus_encoding/tests/encode.rs
+++ b/consensus_encoding/tests/encode.rs
@@ -116,6 +116,6 @@ fn encode_newtype_lifetime_flexibility() {
let custom_encoder = CustomEncoder(BytesEncoder::without_length_prefix(test_data));
let no_lifetime_encoder = NoLifetimeEncoder(ArrayEncoder::without_length_prefix([1, 2, 3, 4]));
- assert_eq!(custom_encoder.current_chunk(), Some(test_data.as_slice()));
- assert_eq!(no_lifetime_encoder.current_chunk(), Some(&[1, 2, 3, 4][..]));
+ assert_eq!(custom_encoder.current_chunk(), test_data.as_slice());
+ assert_eq!(no_lifetime_encoder.current_chunk(), &[1, 2, 3, 4][..]);
}
diff --git a/primitives/src/transaction.rs b/primitives/src/transaction.rs
index 06308241..79717adb 100644
--- a/primitives/src/transaction.rs
+++ b/primitives/src/transaction.rs
@@ -783,10 +783,8 @@ impl<'e> WitnessesEncoder<'e> {
#[cfg(feature = "alloc")]
impl Encoder for WitnessesEncoder<'_> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> {
- // `advance` sets `cur_enc` to `None` once the slice encoder is completely exhausted.
- // `current_chunk` is required to return `None` if called after the encoder is exhausted.
- self.cur_enc.as_ref().and_then(WitnessEncoder::current_chunk)
+ fn current_chunk(&self) -> &[u8] {
+ self.cur_enc.as_ref().map(WitnessEncoder::current_chunk).unwrap_or_default()
}
#[inline]
@@ -807,7 +805,7 @@ impl Encoder for WitnessesEncoder<'_> {
// If advancing the current encoder failed, attempt to move to the next encoder.
if let Some(input) = self.inputs.first() {
*cur = input.witness.encoder();
- if cur.current_chunk().is_some() {
+ if !cur.current_chunk().is_empty() {
return true;
}
} else {
@@ -1720,21 +1718,19 @@ mod tests {
// The txid
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
- 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
- ][..]
- )
+ &[
+ 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
+ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+ ][..]
);
assert!(encoder.advance());
// The vout
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 0, 0, 0][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -1744,19 +1740,19 @@ mod tests {
let mut encoder = out.encoder();
// The amount.
- assert_eq!(encoder.current_chunk(), Some(&[1, 0, 0, 0, 0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1, 0, 0, 0, 0, 0, 0, 0][..]);
assert!(encoder.advance());
// The script pubkey length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
// The script pubkey data.
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -1769,29 +1765,27 @@ mod tests {
// The outpoint (same as tested above).
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
- 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
- ][..]
- )
+ &[
+ 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
+ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+ ][..]
);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 0, 0, 0][..]);
assert!(encoder.advance());
// The script sig
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
// The sequence
- assert_eq!(encoder.current_chunk(), Some(&[0xffu8, 0xff, 0xff, 0xff][..]));
+ assert_eq!(encoder.current_chunk(), &[0xffu8, 0xff, 0xff, 0xff][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -1807,57 +1801,55 @@ mod tests {
let mut encoder = tx.encoder();
// The version
- assert_eq!(encoder.current_chunk(), Some(&[2u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8, 0, 0, 0][..]);
assert!(encoder.advance());
// The segwit marker and flag
- assert_eq!(encoder.current_chunk(), Some(&[0u8, 1][..]));
+ assert_eq!(encoder.current_chunk(), &[0u8, 1][..]);
assert!(encoder.advance());
// The input (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
- 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
- ][..]
- )
+ &[
+ 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
+ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+ ][..]
);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xffu8, 0xff, 0xff, 0xff][..]));
+ assert_eq!(encoder.current_chunk(), &[0xffu8, 0xff, 0xff, 0xff][..]);
assert!(encoder.advance());
// The output (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1, 0, 0, 0, 0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1, 0, 0, 0, 0, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
// The witness
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8, 1, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8, 1, 2, 3][..]);
assert!(encoder.advance());
// The lock time.
- assert_eq!(encoder.current_chunk(), Some(&[0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[0, 0, 0, 0][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
@@ -1877,53 +1869,52 @@ mod tests {
let mut encoder = tx.encoder();
// The version
- assert_eq!(encoder.current_chunk(), Some(&[2u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8, 0, 0, 0][..]);
assert!(encoder.advance());
// Advance past the optional segwit bytes encoder.
assert!(encoder.advance());
// The input (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
- 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
- ][..]
- )
+ &[
+ 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
+ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+ ][..]
+
);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xffu8, 0xff, 0xff, 0xff][..]));
+ assert_eq!(encoder.current_chunk(), &[0xffu8, 0xff, 0xff, 0xff][..]);
assert!(encoder.advance());
// The output (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1, 0, 0, 0, 0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1, 0, 0, 0, 0, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
// Advance past the optional witnesses encoder.
assert!(encoder.advance());
// The lock time.
- assert_eq!(encoder.current_chunk(), Some(&[0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[0, 0, 0, 0][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
// FIXME: Move all these encoding tests to a single file in `primitives/tests/`.
@@ -1959,93 +1950,87 @@ mod tests {
// The block header, 6 encoders, 1 chunk per encoder.
// The block version.
- assert_eq!(encoder.current_chunk(), Some(&[2u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8, 0, 0, 0][..]);
assert!(encoder.advance());
// The previous block's blockhash.
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171,
- 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171
- ][..]
- )
+ &[
+ 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171,
+ 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171, 171
+ ][..]
);
assert!(encoder.advance());
// The merkle root hash.
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205,
- 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205
- ][..]
- )
+ &[
+ 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205,
+ 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205, 205
+ ][..]
);
assert!(encoder.advance());
// The block time.
- assert_eq!(encoder.current_chunk(), Some(&[80, 195, 137, 98][..]));
+ assert_eq!(encoder.current_chunk(), &[80, 195, 137, 98][..]);
assert!(encoder.advance());
// The target (bits).
- assert_eq!(encoder.current_chunk(), Some(&[239, 190, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[239, 190, 0, 0][..]);
assert!(encoder.advance());
// The nonce.
- assert_eq!(encoder.current_chunk(), Some(&[254, 202, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[254, 202, 0, 0][..]);
assert!(encoder.advance());
// The transaction list length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
// The transaction (same as tested above).
// The version
- assert_eq!(encoder.current_chunk(), Some(&[2u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8, 0, 0, 0][..]);
assert!(encoder.advance());
// The segwit marker and flag
- assert_eq!(encoder.current_chunk(), Some(&[0u8, 1][..]));
+ assert_eq!(encoder.current_chunk(), &[0u8, 1][..]);
assert!(encoder.advance());
// The input (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
assert_eq!(
encoder.current_chunk(),
- Some(
- &[
- 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
- 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
- ][..]
- )
+ &[
+ 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13,
+ 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1
+ ][..]
);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[0xffu8, 0xff, 0xff, 0xff][..]));
+ assert_eq!(encoder.current_chunk(), &[0xffu8, 0xff, 0xff, 0xff][..]);
assert!(encoder.advance());
// The output (same as tested above) but with vec length prefix.
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1, 0, 0, 0, 0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[1, 0, 0, 0, 0, 0, 0, 0][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[1u8, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8, 2, 3][..]);
assert!(encoder.advance());
// The witness
- assert_eq!(encoder.current_chunk(), Some(&[1u8][..]));
+ assert_eq!(encoder.current_chunk(), &[1u8][..]);
assert!(encoder.advance());
- assert_eq!(encoder.current_chunk(), Some(&[3u8, 1, 2, 3][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8, 1, 2, 3][..]);
assert!(encoder.advance());
// The lock time.
- assert_eq!(encoder.current_chunk(), Some(&[0, 0, 0, 0][..]));
+ assert_eq!(encoder.current_chunk(), &[0, 0, 0, 0][..]);
assert!(!encoder.advance());
// Exhausted
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
diff --git a/primitives/src/witness.rs b/primitives/src/witness.rs
index 1210cf58..f13c4fad 100644
--- a/primitives/src/witness.rs
+++ b/primitives/src/witness.rs
@@ -293,7 +293,7 @@ impl Encodable for Witness {
impl Encoder for WitnessEncoder<'_> {
#[inline]
- fn current_chunk(&self) -> Option<&[u8]> { self.0.current_chunk() }
+ fn current_chunk(&self) -> &[u8] { self.0.current_chunk() }
#[inline]
fn advance(&mut self) -> bool { self.0.advance() }
@@ -1179,13 +1179,13 @@ mod test {
// Should have length prefix chunk, then the content slice, then exhausted.
let mut encoder = witness.encoder();
- assert_eq!(encoder.current_chunk(), Some(&[2u8][..]));
+ assert_eq!(encoder.current_chunk(), &[2u8][..]);
assert!(encoder.advance());
// We don't encode one element at a time, rather we encode the whole content slice at once.
- assert_eq!(encoder.current_chunk(), Some(&[3u8, 1, 2, 3, 2, 4, 5][..]));
+ assert_eq!(encoder.current_chunk(), &[3u8, 1, 2, 3, 2, 4, 5][..]);
assert!(!encoder.advance());
- assert_eq!(encoder.current_chunk(), None);
+ assert!(encoder.current_chunk().is_empty());
}
#[test]
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