Made bzip2 compression method optional

Cargo.toml

@@ -13,7 +13,11 @@ Library to support the reading and writing of zip files.
 
 [dependencies]
 flate2 = "0.2"
-bzip2 = "0.2"
 time = "0.1"
 podio = "0.1"
 msdos_time = "0.1"
+bzip2 = { version = "0.2", optional = true }
+
+[features]
+default = ["bzip2"]
+no-bzip2 = []

src/compression.rs

@@ -9,6 +9,7 @@ pub enum CompressionMethod
     /// The file is Deflated
     Deflated,
     /// File is compressed using BZIP2 algorithm
+    #[cfg(feature = "bzip2")]
     Bzip2,
     /// Unsupported compression method
     Unsupported(u16),
@@ -20,6 +21,7 @@ impl CompressionMethod {
         match val {
             0 => CompressionMethod::Stored,
             8 => CompressionMethod::Deflated,
+            #[cfg(feature = "bzip2")]
             12 => CompressionMethod::Bzip2,
             v => CompressionMethod::Unsupported(v),
         }
@@ -30,6 +32,7 @@ impl CompressionMethod {
         match self {
             CompressionMethod::Stored => 0,
             CompressionMethod::Deflated => 8,
+            #[cfg(feature = "bzip2")]
             CompressionMethod::Bzip2 => 12,
             CompressionMethod::Unsupported(v) => v,
         }
@@ -50,6 +53,16 @@ mod test {
         }
     }
 
+    #[cfg(not(feature = "bzip2"))]
+    fn methods() -> Vec<CompressionMethod> {
+        vec![CompressionMethod::Stored, CompressionMethod::Deflated]
+    }
+
+    #[cfg(feature = "bzip2")]
+    fn methods() -> Vec<CompressionMethod> {
+        vec![CompressionMethod::Stored, CompressionMethod::Deflated, CompressionMethod::Bzip2]
+    }
+
     #[test]
     fn to_eq_from() {
         fn check_match(method: CompressionMethod) {
@@ -59,8 +72,8 @@ mod test {
             assert_eq!(to, back);
         }
 
-        check_match(CompressionMethod::Stored);
-        check_match(CompressionMethod::Deflated);
-        check_match(CompressionMethod::Bzip2);
+        for method in methods() {
+            check_match(method);
+        }
     }
 }

src/lib.rs

@@ -2,6 +2,7 @@
 
 #![warn(missing_docs)]
 
+#[cfg(feature = "bzip2")]
 extern crate bzip2;
 extern crate flate2;
 extern crate msdos_time;

src/read.rs

@@ -9,12 +9,14 @@ use std::io::prelude::*;
 use std::collections::HashMap;
 use flate2;
 use flate2::FlateReadExt;
-use bzip2::reader::BzDecompressor;
 use podio::{ReadPodExt, LittleEndian};
 use types::ZipFileData;
 use cp437::FromCp437;
 use msdos_time::{TmMsDosExt, MsDosDateTime};
 
+#[cfg(feature = "bzip2")]
+use bzip2::reader::BzDecompressor;
+
 /// Wrapper for reading the contents of a ZIP file.
 ///
 /// ```
@@ -51,6 +53,7 @@ pub struct ZipArchive<R: Read + io::Seek>
 enum ZipFileReader<'a> {
     Stored(Crc32Reader<io::Take<&'a mut Read>>),
     Deflated(Crc32Reader<flate2::read::DeflateDecoder<io::Take<&'a mut Read>>>),
+    #[cfg(feature = "bzip2")]
     Bzip2(Crc32Reader<BzDecompressor<io::Take<&'a mut Read>>>),
 }
 
@@ -147,6 +150,7 @@ impl<R: Read+io::Seek> ZipArchive<R>
                     deflate_reader,
                     data.crc32))
             },
+            #[cfg(feature = "bzip2")]
             CompressionMethod::Bzip2 =>
             {
                 let bzip2_reader = BzDecompressor::new(limit_reader);
@@ -272,6 +276,7 @@ impl<'a> ZipFile<'a> {
         match self.reader {
            ZipFileReader::Stored(ref mut r) => r as &mut Read,
            ZipFileReader::Deflated(ref mut r) => r as &mut Read,
+           #[cfg(feature = "bzip2")]
            ZipFileReader::Bzip2(ref mut r) => r as &mut Read,
         }
     }

src/write.rs

@@ -14,16 +14,20 @@ use time;
 use flate2;
 use flate2::FlateWriteExt;
 use flate2::write::DeflateEncoder;
-use bzip2;
-use bzip2::writer::BzCompressor;
 use podio::{WritePodExt, LittleEndian};
 use msdos_time::TmMsDosExt;
 
+#[cfg(feature = "bzip2")]
+use bzip2;
+#[cfg(feature = "bzip2")]
+use bzip2::writer::BzCompressor;
+
 enum GenericZipWriter<W: Write + io::Seek>
 {
     Closed,
     Storer(W),
     Deflater(DeflateEncoder<W>),
+    #[cfg(feature = "bzip2")]
     Bzip2(BzCompressor<W>),
 }
 
@@ -241,6 +245,7 @@ impl<W: Write+io::Seek> GenericZipWriter<W>
         {
             GenericZipWriter::Storer(w) => w,
             GenericZipWriter::Deflater(w) => try!(w.finish()),
+            #[cfg(feature = "bzip2")]
             GenericZipWriter::Bzip2(w) => match w.into_inner() { Ok(r) => r, Err((_, err)) => try!(Err(err)) },
             GenericZipWriter::Closed => try!(Err(io::Error::new(io::ErrorKind::BrokenPipe, "ZipWriter was already closed"))),
         };
@@ -249,6 +254,7 @@ impl<W: Write+io::Seek> GenericZipWriter<W>
         {
             CompressionMethod::Stored => GenericZipWriter::Storer(bare),
             CompressionMethod::Deflated => GenericZipWriter::Deflater(bare.deflate_encode(flate2::Compression::Default)),
+            #[cfg(feature = "bzip2")]
             CompressionMethod::Bzip2 => GenericZipWriter::Bzip2(BzCompressor::new(bare, bzip2::Compress::Default)),
             CompressionMethod::Unsupported(..) => return Err(ZipError::UnsupportedArchive("Unsupported compression")),
         };
@@ -260,6 +266,7 @@ impl<W: Write+io::Seek> GenericZipWriter<W>
         match *self {
             GenericZipWriter::Storer(ref mut w) => Some(w as &mut Write),
             GenericZipWriter::Deflater(ref mut w) => Some(w as &mut Write),
+            #[cfg(feature = "bzip2")]
             GenericZipWriter::Bzip2(ref mut w) => Some(w as &mut Write),
             GenericZipWriter::Closed => None,
         }
@@ -287,6 +294,7 @@ impl<W: Write+io::Seek> GenericZipWriter<W>
         match *self {
             GenericZipWriter::Storer(..) => Some(CompressionMethod::Stored),
             GenericZipWriter::Deflater(..) => Some(CompressionMethod::Deflated),
+            #[cfg(feature = "bzip2")]
             GenericZipWriter::Bzip2(..) => Some(CompressionMethod::Bzip2),
             GenericZipWriter::Closed => None,
         }