Removed unsupported compression methods from enum

- Simplified enum to only show supported values
- Removed use of FromPrimitive

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "zip"
-version = "0.1.0"
+version = "0.1.1"
 authors = ["Mathijs van de Nes <git@mathijs.vd-nes.nl>"]
 license = "MIT"
 repository = "https://github.com/mvdnes/zip-rs.git"
@@ -12,5 +12,5 @@ Library to support the reading and writing of zip files.
 [dependencies]
 flate2 = "^0.2"
 bzip2 = "^0.2"
-time = "*"
+time = "^0.1"
 podio = "^0.0"

src/compression.rs

@@ -1,41 +1,56 @@
 //! Possible ZIP compression methods.
 
 /// Compression methods for the contents of a ZIP file.
-#[derive(FromPrimitive, Clone, Copy)]
+#[derive(Clone, Copy)]
 pub enum CompressionMethod
 {
     /// The file is stored (no compression)
     Stored = 0,
-    /// The file is Shrunk
-    Shrunk = 1,
-    /// The file is Reduced with compression factor 1
-    Reduced1 = 2,
-    /// The file is Reduced with compression factor 2
-    Reduced2 = 3,
-    /// The file is Reduced with compression factor 3
-    Reduced3 = 4,
-    /// The file is Reduced with compression factor 4
-    Reduced4 = 5,
-    /// The file is Imploded
-    Imploded = 6,
     /// The file is Deflated
     Deflated = 8,
-    /// Enhanced Deflating using Deflate64(tm)
-    Deflate64 = 9,
-    /// PKWARE Data Compression Library Imploding (old IBM TERSE)
-    PkwareImploding = 10,
     /// File is compressed using BZIP2 algorithm
     Bzip2 = 12,
-    /// LZMA (EFS)
-    LZMA = 14,
-    /// File is compressed using IBM TERSE (new)
-    IBMTerse = 18,
-    /// IBM LZ77 z Architecture (PFS)
-    LZ77 = 19,
-    /// WavPack compressed data
-    WavPack = 97,
-    /// PPMd version I, Rev 1
-    PPMdI1 = 98,
-    /// Unknown (invalid) compression
-    Unknown = 10000,
+    /// Unsupported compression method
+    Unsupported = ::std::u16::MAX as isize,
+}
+
+impl CompressionMethod {
+    /// Converts an u16 to its corresponding CompressionMethod
+    pub fn from_u16(val: u16) -> CompressionMethod {
+        match val {
+            0 => CompressionMethod::Stored,
+            8 => CompressionMethod::Deflated,
+            12 => CompressionMethod::Bzip2,
+            _ => CompressionMethod::Unsupported,
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::CompressionMethod;
+
+    #[test]
+    fn from_u16() {
+        for v in (0..::std::u16::MAX as u32 + 1)
+        {
+            let method = CompressionMethod::from_u16(v as u16);
+            match method {
+                CompressionMethod::Unsupported => {},
+                supported => assert_eq!(v, supported as u32),
+            }
+        }
+    }
+
+    #[test]
+    fn to_u16() {
+        fn check_match(method: CompressionMethod) {
+            assert!(method as u32 == CompressionMethod::from_u16(method as u16) as u32);
+        }
+
+        check_match(CompressionMethod::Stored);
+        check_match(CompressionMethod::Deflated);
+        check_match(CompressionMethod::Bzip2);
+        check_match(CompressionMethod::Unsupported);
+    }
 }

src/read.rs

@@ -7,7 +7,6 @@ use result::{ZipResult, ZipError};
 use std::io;
 use std::io::prelude::*;
 use std::collections::HashMap;
-use std::num::FromPrimitive;
 use flate2;
 use flate2::FlateReadExt;
 use bzip2::reader::BzDecompressor;
@@ -231,7 +230,7 @@ fn central_header_to_zip_file<R: Read+io::Seek>(reader: &mut R) -> ZipResult<Zip
     let mut result = ZipFileData
     {
         encrypted: encrypted,
-        compression_method: FromPrimitive::from_u16(compression_method).unwrap_or(CompressionMethod::Unknown),
+        compression_method: CompressionMethod::from_u16(compression_method),
         last_modified_time: util::msdos_datetime_to_tm(last_mod_time, last_mod_date),
         crc32: crc32,
         compressed_size: compressed_size as u64,