add and use AES associated constant

src/compression.rs

@@ -28,6 +28,7 @@ pub enum CompressionMethod {
     ///
     /// The actual compression method has to be taken from the AES extra data field
     /// or from `ZipFileData`.
+    #[cfg(feature = "aes-crypto")]
     Aes,
     /// Compress the file using ZStandard
     #[cfg(feature = "zstd")]
@@ -77,6 +78,10 @@ impl CompressionMethod {
     pub const JPEG: Self = CompressionMethod::Unsupported(96);
     pub const WAVPACK: Self = CompressionMethod::Unsupported(97);
     pub const PPMD: Self = CompressionMethod::Unsupported(98);
+    #[cfg(feature = "aes-crypto")]
+    pub const AES: Self = CompressionMethod::Aes;
+    #[cfg(not(feature = "aes-crypto"))]
+    pub const AES: Self = CompressionMethod::Unsupported(99);
 }
 impl CompressionMethod {
     /// Converts an u16 to its corresponding CompressionMethod
@@ -96,9 +101,9 @@ impl CompressionMethod {
             8 => CompressionMethod::Deflated,
             #[cfg(feature = "bzip2")]
             12 => CompressionMethod::Bzip2,
-            99 => CompressionMethod::Aes,
             #[cfg(feature = "zstd")]
             93 => CompressionMethod::Zstd,
+            99 => CompressionMethod::AES,
 
             v => CompressionMethod::Unsupported(v),
         }
@@ -121,7 +126,7 @@ impl CompressionMethod {
             CompressionMethod::Deflated => 8,
             #[cfg(feature = "bzip2")]
             CompressionMethod::Bzip2 => 12,
-            CompressionMethod::Aes => 99,
+            CompressionMethod::AES => 99,
             #[cfg(feature = "zstd")]
             CompressionMethod::Zstd => 93,
 

src/read.rs

@@ -669,7 +669,7 @@ pub(crate) fn central_header_to_zip_file<R: Read + io::Seek>(
         Err(e) => return Err(e),
     }
 
-    let aes_enabled = result.compression_method == CompressionMethod::Aes;
+    let aes_enabled = result.compression_method == CompressionMethod::AES;
     if aes_enabled && result.aes_mode.is_none() {
         return Err(ZipError::InvalidArchive(
             "AES encryption without AES extra data field",

src/write.rs

@@ -848,7 +848,7 @@ impl<W: Write + io::Seek> GenericZipWriter<W> {
                 CompressionMethod::Bzip2 => {
                     GenericZipWriter::Bzip2(BzEncoder::new(bare, bzip2::Compression::default()))
                 }
-                CompressionMethod::Aes => {
+                CompressionMethod::AES => {
                     return Err(ZipError::UnsupportedArchive(
                         "AES compression is not supported for writing",
                     ))

tests/aes_encryption.rs

@@ -1,3 +1,5 @@
+#![cfg(feature = "aes-crypto")]
+
 use std::io::{self, Read};
 use zip::ZipArchive;