Revert "refactor: move stream out of use for now"

This reverts commit 642e58f.

src/chunk.rs

@@ -14,3 +14,12 @@ pub struct EncryptedChunk {
     /// The encrypted content of the chunk
     pub content: Bytes,
 }
+
+/// Calculate (start_position, end_position) for each chunk for the input file size
+pub(crate) fn batch_positions(data_size: usize) -> Vec<(usize, usize)> {
+    let num_chunks = crate::get_num_chunks(data_size);
+
+    (0..num_chunks)
+        .map(|index| crate::get_start_end_positions(data_size, index))
+        .collect()
+}

src/lib.rs

@@ -98,6 +98,8 @@ mod error;
 mod python;
 pub mod test_helpers;
 mod utils;
+/// Stream encryption and decryption
+pub mod stream;
 
 pub use chunk::EncryptedChunk;
 pub use decrypt::decrypt_chunk;
@@ -107,6 +109,7 @@ pub use xor_name::XorName;
 pub use self::{
     data_map::{ChunkInfo, DataMap},
     error::{Error, Result},
+    stream::{StreamSelfDecryptor, StreamSelfEncryptor},
 };
 use bytes::Bytes;
 use lazy_static::lazy_static;