Add subspace-object-fetching crate

crates/subspace-core-primitives/src/pieces.rs

@@ -652,6 +652,7 @@ impl Record {
     }
 
     /// Convert from a record to its raw bytes. Used for object reconstruction.
+    /// Only works for source records.
     pub fn to_raw_record_bytes(&self) -> impl Iterator<Item = u8> + '_ {
         // We have zero byte padding from [`Scalar::SAFE_BYTES`] to [`Scalar::FULL_BYTES`] that we need
         // to skip

crates/subspace-object-fetching/Cargo.toml

@@ -0,0 +1,43 @@
+[package]
+name = "subspace-object-fetching"
+description = "Fetching archived objects from the Subspace Distributed Storage Network"
+license = "Apache-2.0"
+version = "0.1.0"
+authors = ["Teor <[email protected]>"]
+edition = "2021"
+include = [
+    "/src",
+    "/Cargo.toml",
+    "/README.md",
+]
+
+[lib]
+# Necessary for CLI options to work on benches
+bench = false
+
+[dependencies]
+parity-scale-codec = { version = "3.6.12", default-features = false, features = ["derive"] }
+subspace-archiving = { version = "0.1.0", path = "../subspace-archiving", default-features = false }
+subspace-core-primitives = { version = "0.1.0", path = "../subspace-core-primitives", default-features = false }
+subspace-erasure-coding = { version = "0.1.0", path = "../subspace-erasure-coding", default-features = false }
+thiserror = { version = "1.0.63", optional = true }
+tracing = { version = "0.1.40", default-features = false }
+
+[dev-dependencies]
+subspace-core-primitives = { version = "0.1.0", path = "../subspace-core-primitives" }
+
+[features]
+default = ["std"]
+parallel = [
+    "subspace-archiving/parallel",
+    "subspace-core-primitives/parallel",
+]
+std = [
+    "parity-scale-codec/std",
+    "parallel",
+    "subspace-archiving/std",
+    "subspace-core-primitives/std",
+    "subspace-erasure-coding/std",
+    "thiserror",
+    "tracing/std",
+]

crates/subspace-object-fetching/README.md

@@ -0,0 +1 @@
+Fetching archived objects from the Subspace Distributed Storage Network.

crates/subspace-object-fetching/src/lib.rs

@@ -0,0 +1,19 @@
+// Copyright (C) 2024 Subspace Labs, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Fetching archived objects from the Subspace Distributed Storage Network.
+#![cfg_attr(not(feature = "std"), no_std)]
+
+pub mod object_fetcher;