From faf574364aa213d584da2ead432c25595b43a153 Mon Sep 17 00:00:00 2001
From: Nathan Fisher <nfisher.sr@gmail.com>
Date: Wed, 22 Mar 2023 18:50:20 -0400
Subject: [PATCH] Add basic data structures to represent Tar archives

---
 Cargo.lock        |  5 +++++
 Cargo.toml        |  4 ++++
 tar/Cargo.toml    |  5 +++++
 tar/src/header.rs | 21 +++++++++++++++++++++
 tar/src/lib.rs    |  7 +++++++
 tar/src/node.rs   |  6 ++++++
 6 files changed, 48 insertions(+)
 create mode 100644 tar/Cargo.toml
 create mode 100644 tar/src/header.rs
 create mode 100644 tar/src/lib.rs
 create mode 100644 tar/src/node.rs

diff --git a/Cargo.lock b/Cargo.lock
index 4b25e32..9d44710 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -202,6 +202,7 @@ dependencies = [
  "ron",
  "serde",
  "sha2",
+ "tar",
  "walkdir",
 ]
 
@@ -393,6 +394,10 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tar"
+version = "0.1.0"
+
 [[package]]
 name = "termcolor"
 version = "1.2.0"
diff --git a/Cargo.toml b/Cargo.toml
index c69535e..abb3070 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,11 +5,15 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[workspace]
+members = [ "tar" ]
+
 [dependencies]
 clap = "4.1"
 rayon = "1.7"
 ron = "0.8"
 sha2 = "0.10"
+tar = { path = "tar" }
 walkdir = "2.3"
 
 [dependencies.serde]
diff --git a/tar/Cargo.toml b/tar/Cargo.toml
new file mode 100644
index 0000000..3b4d893
--- /dev/null
+++ b/tar/Cargo.toml
@@ -0,0 +1,5 @@
+[package]
+name = "tar"
+version = "0.1.0"
+edition = "2021"
+
diff --git a/tar/src/header.rs b/tar/src/header.rs
new file mode 100644
index 0000000..317f519
--- /dev/null
+++ b/tar/src/header.rs
@@ -0,0 +1,21 @@
+#[derive(Clone, Copy, Debug, PartialEq)]
+pub struct Header {
+    pub fname: [u8; 100],
+    pub mode: [u8; 8],
+    pub uid: [u8; 8],
+    pub gid: [u8; 8],
+    pub size: [u8; 12],
+    pub mtime: [u8; 12],
+    pub header_checksum: [u8; 8],
+    pub link_indicator: [u8; 1],
+    pub link_name: [u8; 100],
+    pub ustar_magic: [u8; 6],
+    pub ustar_version: [u8; 2],
+    pub username: [u8; 32],
+    pub groupname: [u8; 32],
+    pub device_major: [u8; 8],
+    pub device_minor: [u8; 8],
+    pub file_prefix: [u8; 155],
+    pub reserved: [u8; 12],
+}
+
diff --git a/tar/src/lib.rs b/tar/src/lib.rs
new file mode 100644
index 0000000..dadf0e4
--- /dev/null
+++ b/tar/src/lib.rs
@@ -0,0 +1,7 @@
+mod header;
+mod node;
+pub use {header::Header, node::Node};
+
+pub struct Archive {
+    pub nodes: Vec<Node>,
+}
diff --git a/tar/src/node.rs b/tar/src/node.rs
new file mode 100644
index 0000000..9d4a683
--- /dev/null
+++ b/tar/src/node.rs
@@ -0,0 +1,6 @@
+use crate::Header;
+
+pub struct Node {
+    pub header: Header,
+    pub data: Vec<[u8; 512]>,
+}