Use core crate where is applicable within unixfs

src/unixfs/cat.rs

@@ -3,9 +3,9 @@ use async_stream::stream;
 use cid::Cid;
 use futures::stream::Stream;
 use ipfs_unixfs::file::{visit::IdleFileVisit, FileReadFailed};
-use std::borrow::Borrow;
-use std::fmt;
-use std::ops::Range;
+use core::borrow::Borrow;
+use core::fmt;
+use core::ops::Range;
 
 /// IPFS cat operation, producing a stream of file bytes. This is generic over the different kinds
 /// of ways to own an `Ipfs` value in order to support both operating with borrowed `Ipfs` value

unixfs/src/dagpb.rs

@@ -2,7 +2,7 @@
 ///! follows from the inseparability of dag-pb and UnixFS.
 use crate::pb::PBNode;
 use std::borrow::Cow;
-use std::convert::TryFrom;
+use core::convert::TryFrom;
 
 /// Extracts the PBNode::Data field from the block as it appears on the block.
 pub fn node_data(block: &[u8]) -> Result<Option<&[u8]>, quick_protobuf::Error> {

unixfs/src/dir.rs

@@ -1,8 +1,8 @@
 use crate::pb::{FlatUnixFs, PBLink, PBNode, ParsingFailed, UnixFsType};
 use crate::{InvalidCidInLink, UnexpectedNodeType};
 use cid::Cid;
-use std::convert::TryFrom;
-use std::fmt;
+use core::convert::TryFrom;
+use core::fmt;
 
 mod sharded_lookup;
 pub use sharded_lookup::{Cache, LookupError, ShardError, ShardedLookup};
@@ -217,7 +217,7 @@ mod tests {
     use crate::test_support::FakeBlockstore;
     use cid::Cid;
     use hex_literal::hex;
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     #[test]
     fn resolve_paths_from_plain_dagpb() {

unixfs/src/dir/builder.rs

@@ -1,5 +1,5 @@
 use cid::Cid;
-use std::fmt;
+use core::fmt;
 
 mod dir_builder;
 use dir_builder::DirBuilder;

unixfs/src/dir/builder/buffered.rs

@@ -189,7 +189,7 @@ mod tests {
         super::OwnedTreeNode, BufferingTreeBuilder, Metadata, TreeBuildingFailed, TreeOptions,
     };
     use cid::Cid;
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     #[test]
     fn some_directories() {
@@ -398,12 +398,12 @@ mod tests {
 
     fn verify_results(
         mut expected: Vec<(
-            impl AsRef<str> + std::fmt::Debug,
-            impl AsRef<str> + std::fmt::Debug,
+            impl AsRef<str> + core::fmt::Debug,
+            impl AsRef<str> + core::fmt::Debug,
         )>,
         mut actual: Vec<(String, Cid, Box<[u8]>)>,
     ) {
-        use std::fmt;
+        use core::fmt;
 
         struct Hex<'a>(&'a [u8]);
 

unixfs/src/dir/builder/iter.rs

@@ -3,7 +3,7 @@ use super::{
 };
 use cid::Cid;
 use std::collections::HashMap;
-use std::fmt;
+use core::fmt;
 
 /// Constructs the directory nodes required for a tree.
 ///
@@ -132,7 +132,7 @@ impl PostOrderIterator {
                 needed_zeroes -= zeroes.len();
             }
 
-            buffer.extend(std::iter::repeat(0).take(needed_zeroes));
+            buffer.extend(core::iter::repeat(0).take(needed_zeroes));
         }
 
         let mut writer = Writer::new(BytesWriter::new(&mut buffer[..]));

unixfs/src/dir/directory.rs

@@ -1,5 +1,5 @@
 use crate::pb::FlatUnixFs;
-use std::fmt;
+use core::fmt;
 
 /// Ensures the directory looks like something we actually support.
 pub(crate) fn check_directory_supported(

unixfs/src/dir/sharded_lookup.rs

@@ -4,8 +4,8 @@ use crate::{InvalidCidInLink, UnexpectedNodeType};
 use cid::Cid;
 use std::borrow::Cow;
 use std::collections::VecDeque;
-use std::convert::TryFrom;
-use std::fmt;
+use core::convert::TryFrom;
+use core::fmt;
 
 /// A cache of data structures used while traversing. Reduces allocations when walking over multiple
 /// path segments.
@@ -148,7 +148,7 @@ impl<'needle> ShardedLookup<'needle> {
         } else if hamt.data.filesize.is_some() || !hamt.data.blocksizes.is_empty() {
             Err(ShardError::UnexpectedProperties {
                 filesize: hamt.data.filesize,
-                blocksizes: std::mem::take(&mut hamt.data.blocksizes),
+                blocksizes: core::mem::take(&mut hamt.data.blocksizes),
             })
         } else {
             Ok(())
@@ -338,7 +338,7 @@ mod tests {
     use super::{LookupError, MaybeResolved, ShardError, ShardedLookup};
     use crate::pb::FlatUnixFs;
     use hex_literal::hex;
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     // a directory from some linux kernel tree import: linux-5.5-rc5/tools/testing/selftests/rcutorture/
     const DIR: &[u8] = &hex!("122e0a2212204baf5104fe53d495223f8e2ba95375a31fda6b18e926cb54edd61f30b5f1de6512053641646f6318b535122c0a221220fd9f545068048e647d5d0b275ed171596e0c1c04b8fed09dc13bee7607e75bc7120242391883c00312330a2212208a4a68f6b88594ce373419586c12d24bde2d519ab636b1d2dcc986eb6265b7a3120a43444d616b6566696c65189601122f0a2212201ededc99d23a7ef43a8f17e6dd8b89934993245ef39e18936a37e412e536ed681205463562696e18c5ad030a280805121f200000000020000200000000000000000004000000000000000000000000002822308002");

unixfs/src/file.rs

@@ -5,7 +5,7 @@
 use crate::pb::ParsingFailed;
 use crate::{InvalidCidInLink, Metadata, UnexpectedNodeType};
 use std::borrow::Cow;
-use std::fmt;
+use core::fmt;
 
 /// Low level UnixFS file descriptor reader support.
 mod reader;

unixfs/src/file/adder.rs

@@ -3,11 +3,11 @@ use cid::Cid;
 use crate::pb::{FlatUnixFs, PBLink, UnixFs, UnixFsType};
 use quick_protobuf::{MessageWrite, Writer};
 use std::borrow::Cow;
-use std::fmt;
+use core::fmt;
 
 use sha2::{Digest, Sha256};
 
-/// File tree builder. Implements [`std::default::Default`] which tracks the recent defaults.
+/// File tree builder. Implements [`core::default::Default`] which tracks the recent defaults.
 ///
 /// Custom file tree builder can be created with [`FileAdder::builder()`] and configuring the
 /// chunker and collector.
@@ -327,7 +327,7 @@ pub enum Chunker {
     Size(usize),
 }
 
-impl std::default::Default for Chunker {
+impl core::default::Default for Chunker {
     /// Returns a default chunker which matches go-ipfs 0.6
     fn default() -> Self {
         Chunker::Size(256 * 1024)
@@ -367,7 +367,7 @@ pub enum Collector {
     Balanced(BalancedCollector),
 }
 
-impl std::default::Default for Collector {
+impl core::default::Default for Collector {
     fn default() -> Self {
         Collector::Balanced(Default::default())
     }
@@ -404,7 +404,7 @@ impl fmt::Debug for BalancedCollector {
     }
 }
 
-impl std::default::Default for BalancedCollector {
+impl core::default::Default for BalancedCollector {
     /// Returns a default collector which matches go-ipfs 0.6
     ///
     /// The origin for 174 is not described in the the [specs], but has likely to do something
@@ -487,8 +487,8 @@ impl BalancedCollector {
 
         let mut ret = Vec::new();
 
-        let mut reused_links = std::mem::take(&mut self.reused_links);
-        let mut reused_blocksizes = std::mem::take(&mut self.reused_blocksizes);
+        let mut reused_links = core::mem::take(&mut self.reused_links);
+        let mut reused_blocksizes = core::mem::take(&mut self.reused_blocksizes);
 
         if let Some(need) = self.branching_factor.checked_sub(reused_links.capacity()) {
             reused_links.reserve(need);
@@ -647,7 +647,7 @@ mod tests {
     use crate::test_support::FakeBlockstore;
     use cid::Cid;
     use hex_literal::hex;
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     #[test]
     fn test_size_chunker() {

unixfs/src/file/reader.rs

@@ -1,7 +1,7 @@
 use crate::pb::{FlatUnixFs, PBLink, RangeLinks, UnixFsType};
-use std::convert::TryFrom;
-use std::fmt;
-use std::ops::Range;
+use core::convert::TryFrom;
+use core::fmt;
+use core::ops::Range;
 
 use crate::file::{FileError, FileReadFailed, Metadata, UnwrapBorrowedExt};
 

unixfs/src/file/visit.rs

@@ -1,6 +1,6 @@
 use cid::Cid;
-use std::convert::TryFrom;
-use std::ops::Range;
+use core::convert::TryFrom;
+use core::ops::Range;
 
 use crate::file::reader::{FileContent, FileReader, Traversal};
 use crate::file::{FileReadFailed, Metadata};
@@ -225,7 +225,7 @@ fn to_pending(
 /// Returns true if the blocks byte offsets are interesting for our target range, false otherwise.
 /// If there is no target, all blocks are of interest.
 fn block_is_in_target_range(block: &Range<u64>, target: Option<&Range<u64>>) -> bool {
-    use std::cmp::{max, min};
+    use core::cmp::{max, min};
 
     if let Some(target) = target {
         max(block.start, target.start) <= min(block.end, target.end)
@@ -249,7 +249,7 @@ fn maybe_target_slice<'a>(
 }
 
 fn target_slice<'a>(content: &'a [u8], block: &Range<u64>, target: &Range<u64>) -> &'a [u8] {
-    use std::cmp::min;
+    use core::cmp::min;
 
     if !block_is_in_target_range(block, Some(target)) {
         // defaulting to empty slice is good, and similar to the "cat" HTTP API operation.
@@ -284,7 +284,7 @@ mod tests {
     #[test]
     #[allow(clippy::type_complexity)]
     fn slice_for_target() {
-        use std::ops::Range;
+        use core::ops::Range;
 
         // turns out these examples are not easy to determine at all
         // writing out the type here avoids &b""[..] inside the array.

unixfs/src/lib.rs

@@ -9,7 +9,7 @@
 //! `ipfs_unixfs::resolve` should be used.
 
 use std::borrow::Cow;
-use std::fmt;
+use core::fmt;
 
 /// File support.
 pub mod file;
@@ -148,7 +148,7 @@ impl Metadata {
 
     /// Returns the raw timestamp of last modification time, if specified.
     ///
-    /// The timestamp is `(seconds, nanos)` - similar to `std::time::Duration`, with the exception of
+    /// The timestamp is `(seconds, nanos)` - similar to `core::time::Duration`, with the exception of
     /// allowing seconds to be negative. The seconds are calculated from `1970-01-01 00:00:00` or
     /// the common "unix epoch".
     pub fn mtime(&self) -> Option<(i64, u32)> {

unixfs/src/pb.rs

@@ -1,8 +1,8 @@
 use quick_protobuf::{errors::Result as ProtobufResult, Writer, WriterBackend};
 use std::borrow::Cow;
-use std::convert::TryFrom;
-use std::fmt;
-use std::ops::Range;
+use core::convert::TryFrom;
+use core::fmt;
+use core::ops::Range;
 
 pub(crate) mod merkledag;
 pub(crate) use merkledag::PBLink;
@@ -198,11 +198,10 @@ where
 
 #[cfg(test)]
 mod test {
-
     use super::{FlatUnixFs, PBNode, UnixFs, UnixFsType};
     use hex_literal::hex;
     use std::borrow::Cow;
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     #[test]
     fn parse_content() {

unixfs/src/pb/merkledag.rs

@@ -10,10 +10,11 @@ use super::*;
 use quick_protobuf::sizeofs::*;
 use quick_protobuf::{BytesReader, MessageRead, MessageWrite, Result, Writer, WriterBackend};
 use std::borrow::Cow;
-use std::convert::TryFrom;
+use core::convert::TryFrom;
 use std::io::Write;
-use std::ops::Deref;
-use std::ops::DerefMut;
+use core::ops::Deref;
+use core::ops::DerefMut;
+
 #[derive(Debug, Default, PartialEq, Clone)]
 pub struct PBLink<'a> {
     pub Hash: Option<Cow<'a, [u8]>>,

unixfs/src/pb/unixfs.rs

@@ -6,14 +6,16 @@
 #![allow(unknown_lints)]
 #![allow(clippy::all)]
 #![cfg_attr(rustfmt, rustfmt_skip)]
+
 use super::*;
 use quick_protobuf::sizeofs::*;
 use quick_protobuf::{BytesReader, MessageRead, MessageWrite, Result, Writer, WriterBackend};
 use std::borrow::Cow;
-use std::convert::TryFrom;
+use core::convert::TryFrom;
 use std::io::Write;
-use std::ops::Deref;
-use std::ops::DerefMut;
+use core::ops::Deref;
+use core::ops::DerefMut;
+
 #[derive(Debug, Default, PartialEq, Clone)]
 pub struct Data<'a> {
     pub Type: mod_Data::DataType,

unixfs/src/symlink.rs

@@ -34,7 +34,7 @@ mod tests {
     use super::serialize_symlink_block;
     use cid::Cid;
     use sha2::{Digest, Sha256};
-    use std::convert::TryFrom;
+    use core::convert::TryFrom;
 
     #[test]
     fn simple_symlink() {
@@ -172,7 +172,7 @@ mod tests {
                 ContinuedWalk::Symlink(link_name, _cid, path, _metadata) => {
                     actual.push(Entry::Symlink(
                         path.into(),
-                        std::str::from_utf8(link_name).unwrap().to_owned(),
+                        core::str::from_utf8(link_name).unwrap().to_owned(),
                     ));
                 }
             };

unixfs/src/test_support.rs

@@ -1,7 +1,7 @@
 use cid::Cid;
 use hex_literal::hex;
 use std::collections::HashMap;
-use std::convert::TryFrom;
+use core::convert::TryFrom;
 
 #[derive(Default)]
 pub struct FakeBlockstore {

unixfs/src/walk.rs

@@ -6,8 +6,8 @@ use crate::{InvalidCidInLink, Metadata, UnexpectedNodeType};
 use cid::Cid;
 use either::Either;
 use std::borrow::Cow;
-use std::convert::TryFrom;
-use std::fmt;
+use core::convert::TryFrom;
+use core::fmt;
 use std::path::{Path, PathBuf};
 
 /// `Walker` helps with walking a UnixFS tree, including all of the content and files. It is
@@ -772,7 +772,7 @@ mod tests {
     }
 
     fn sharded_dir_scenario(root_name: &str) {
-        use std::fmt::Write;
+        use core::fmt::Write;
 
         // the hamt sharded directory is such that the root only has buckets so all of the actual files
         // are at second level buckets, each bucket should have 2 files. the actual files, in fact, constitute a single empty