fix: unsealing restrictions and padding (#958)

fix: unsealing restrictions and padding

Author: dignifiedquire

filecoin-proofs/src/api/mod.rs

@@ -76,13 +76,16 @@ pub fn get_unsealed_range<T: Into<PathBuf> + AsRef<Path>>(
         porep_config.window_size_nodes,
     );
 
+    let offset_padded: PaddedBytesAmount = UnpaddedBytesAmount::from(offset).into();
+    let num_bytes_padded: PaddedBytesAmount = num_bytes.into();
+
     let unsealed = StackedDrg::<DefaultTreeHasher, DefaultPieceHasher>::extract_range(
         &pp,
         &replica_id,
         &data,
         Some(config),
-        offset.into(),
-        num_bytes.into(),
+        offset_padded.into(),
+        num_bytes_padded.into(),
     )?;
 
     let written = write_unpadded(&unsealed, &mut buf_writer, offset.into(), num_bytes.into())?;

filecoin-proofs/src/types/bytes_amount.rs

@@ -60,6 +60,12 @@ impl From<UnpaddedBytesAmount> for UnpaddedByteIndex {
     }
 }
 
+impl From<UnpaddedByteIndex> for UnpaddedBytesAmount {
+    fn from(n: UnpaddedByteIndex) -> Self {
+        UnpaddedBytesAmount(n.0)
+    }
+}
+
 impl From<UnpaddedByteIndex> for u64 {
     fn from(n: UnpaddedByteIndex) -> Self {
         n.0

storage-proofs/src/stacked/proof.rs

@@ -472,16 +472,6 @@ impl<'a, H: 'static + Hasher, G: 'static + Hasher> StackedDrg<'a, H, G> {
         num_bytes: usize,
     ) -> Result<Vec<u8>> {
         ensure!(offset + num_bytes <= data.len(), "Out of bounds");
-        ensure!(
-            offset % NODE_SIZE == 0,
-            "Invalid offset, must be a multiple of {}",
-            NODE_SIZE
-        );
-        ensure!(
-            num_bytes % NODE_SIZE == 0,
-            "Invalid num_bytes, must be a multiple of {}",
-            NODE_SIZE
-        );
 
         // determine the first window needed to be decoded
         let first_window_index = offset / pp.window_size_bytes();