From 83ab88f93e3d62a24173926ddc33957720abfd40 Mon Sep 17 00:00:00 2001
From: sergiotarxz <sergiotarxz@posteo.net>
Date: Sat, 7 Nov 2020 00:55:34 +0100
Subject: [PATCH] feat: Added needed types to implement realpath.[

---
 Cargo.toml              |  1 +
 src/lib.rs              |  1 +
 src/packet.rs           |  1 +
 src/packet/types.rs     |  1 +
 src/packet/types/str.rs | 23 +++++++++++++++++++++++
 src/sftp.rs             | 29 +++++++++++++++++++++++++++++
 6 files changed, 56 insertions(+)
 create mode 100644 src/packet/types.rs
 create mode 100644 src/packet/types/str.rs
 create mode 100644 src/sftp.rs

diff --git a/Cargo.toml b/Cargo.toml
index d6e9f0e..d7381b6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,3 +8,4 @@ include = [ "lib/**/*.php" ]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+regex = "1.1.9"
diff --git a/src/lib.rs b/src/lib.rs
index 43e7ca6..b2d874a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,2 +1,3 @@
 pub mod packet;
 pub mod constants;
+pub mod sftp;
diff --git a/src/packet.rs b/src/packet.rs
index cc625a2..f309162 100644
--- a/src/packet.rs
+++ b/src/packet.rs
@@ -1,5 +1,6 @@
 pub mod data;
 pub mod header;
+pub mod types;
 
 use crate::constants::SSH_FXP_INIT;
 use crate::constants::SSH_FXP_VERSION;
diff --git a/src/packet/types.rs b/src/packet/types.rs
new file mode 100644
index 0000000..3bb9df5
--- /dev/null
+++ b/src/packet/types.rs
@@ -0,0 +1 @@
+pub mod str;
diff --git a/src/packet/types/str.rs b/src/packet/types/str.rs
new file mode 100644
index 0000000..df0eae3
--- /dev/null
+++ b/src/packet/types/str.rs
@@ -0,0 +1,23 @@
+use regex::Regex;
+use std::io::BufRead;
+
+pub fn serialize(string_to_serialize: &str) -> Vec<u8> {
+    [string_to_serialize, "\0"].join("").as_bytes().to_vec()
+}
+
+pub fn deserialize(bytes_to_deserialize: &[u8]) -> String {
+    Regex::new("\0$")
+        .expect("Unable to parse regex \\0$.")
+        .replace(
+            &String::from_utf8(bytes_to_deserialize.to_vec())
+                .expect("Get a utf-8 encoded ftp client."),
+            "",
+        )
+        .to_string()
+}
+
+pub fn get_u8_array_c_string_from_u8_array(mut u8_array: &[u8]) -> Vec<u8> {
+    let mut return_array: Vec<u8> = Vec::new();
+    u8_array.read_until(0, &mut return_array).expect("Could not read string from u8_array");
+    return_array
+}
diff --git a/src/sftp.rs b/src/sftp.rs
new file mode 100644
index 0000000..6cdcdc6
--- /dev/null
+++ b/src/sftp.rs
@@ -0,0 +1,29 @@
+use regex::Regex;
+
+pub fn realpath(path: &str) -> String {
+    let components: Vec<&str> = Regex::new("/+")
+        .expect("Error parsing regex /+.")
+        .split(path)
+        .collect();
+    let mut abs_path: Vec<&str> = Vec::new();
+    for component in components {
+        if (Regex::new("^\\.$")
+            .expect("Error parsing regex ^\\.$")
+            .is_match(component))
+            || (Regex::new("^$")
+                .expect("Error parsing regex ^$.")
+                .is_match(component))
+        {
+            continue;
+        } else if Regex::new("^\\.\\.$")
+            .expect("Error parsing regex ^\\.\\.$.")
+            .is_match(component)
+        {
+            abs_path.pop();
+        } else {
+            abs_path.push(component);
+        }
+    }
+    let abs_path: &str = &abs_path.join("/");
+    ["/", abs_path].join("")
+}