tools: add compression module

only contains a basic enum for the different compresssion methods

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/tools.rs

@@ -22,6 +22,7 @@ pub mod apt;
 pub mod async_io;
 pub mod borrow;
 pub mod cert;
+pub mod compression;
 pub mod daemon;
 pub mod disks;
 pub mod format;

src/tools/compression.rs

@@ -0,0 +1,39 @@
+use anyhow::{bail, Error};
+use hyper::header;
+
+/// Possible Compression Methods, order determines preference (later is preferred)
+#[derive(Eq, Ord, PartialEq, PartialOrd, Debug)]
+pub enum CompressionMethod {
+    Deflate,
+//    Gzip,
+//    Brotli,
+}
+
+impl CompressionMethod {
+    pub fn content_encoding(&self) -> header::HeaderValue {
+        header::HeaderValue::from_static(self.extension())
+    }
+
+    pub fn extension(&self) -> &'static str {
+        match *self {
+//            CompressionMethod::Brotli => "br",
+//            CompressionMethod::Gzip => "gzip",
+            CompressionMethod::Deflate => "deflate",
+        }
+    }
+}
+
+impl std::str::FromStr for CompressionMethod {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+//            "br" => Ok(CompressionMethod::Brotli),
+//            "gzip" => Ok(CompressionMethod::Gzip),
+            "deflate" => Ok(CompressionMethod::Deflate),
+            // http accept-encoding allows to give weights with ';q='
+            other if other.starts_with("deflate;q=") => Ok(CompressionMethod::Deflate),
+            _ => bail!("unknown compression format"),
+        }
+    }
+}