1 files changed, 372 insertions, 0 deletions
diff --git a/vendor/zip/src/read/stream.rs b/vendor/zip/src/read/stream.rs
new file mode 100644
index 000000000..5a01b23f9
--- /dev/null
+++ b/vendor/zip/src/read/stream.rs
@@ -0,0 +1,372 @@
+use std::fs;
+use std::io::{self, Read};
+use std::path::Path;
+
+use super::{
+    central_header_to_zip_file_inner, read_zipfile_from_stream, spec, ZipError, ZipFile,
+    ZipFileData, ZipResult,
+};
+
+use byteorder::{LittleEndian, ReadBytesExt};
+
+/// Stream decoder for zip.
+#[derive(Debug)]
+pub struct ZipStreamReader<R>(R);
+
+impl<R> ZipStreamReader<R> {
+    /// Create a new ZipStreamReader
+    pub fn new(reader: R) -> Self {
+        Self(reader)
+    }
+}
+
+impl<R: Read> ZipStreamReader<R> {
+    fn parse_central_directory(&mut self) -> ZipResult<Option<ZipStreamFileMetadata>> {
+        // Give archive_offset and central_header_start dummy value 0, since
+        // they are not used in the output.
+        let archive_offset = 0;
+        let central_header_start = 0;
+
+        // Parse central header
+        let signature = self.0.read_u32::<LittleEndian>()?;
+        if signature != spec::CENTRAL_DIRECTORY_HEADER_SIGNATURE {
+            Ok(None)
+        } else {
+            central_header_to_zip_file_inner(&mut self.0, archive_offset, central_header_start)
+                .map(ZipStreamFileMetadata)
+                .map(Some)
+        }
+    }
+
+    /// Iteraate over the stream and extract all file and their
+    /// metadata.
+    pub fn visit<V: ZipStreamVisitor>(mut self, visitor: &mut V) -> ZipResult<()> {
+        while let Some(mut file) = read_zipfile_from_stream(&mut self.0)? {
+            visitor.visit_file(&mut file)?;
+        }
+
+        while let Some(metadata) = self.parse_central_directory()? {
+            visitor.visit_additional_metadata(&metadata)?;
+        }
+
+        Ok(())
+    }
+
+    /// Extract a Zip archive into a directory, overwriting files if they
+    /// already exist. Paths are sanitized with [`ZipFile::enclosed_name`].
+    ///
+    /// Extraction is not atomic; If an error is encountered, some of the files
+    /// may be left on disk.
+    pub fn extract<P: AsRef<Path>>(self, directory: P) -> ZipResult<()> {
+        struct Extractor<'a>(&'a Path);
+        impl ZipStreamVisitor for Extractor<'_> {
+            fn visit_file(&mut self, file: &mut ZipFile<'_>) -> ZipResult<()> {
+                let filepath = file
+                    .enclosed_name()
+                    .ok_or(ZipError::InvalidArchive("Invalid file path"))?;
+
+                let outpath = self.0.join(filepath);
+
+                if file.name().ends_with('/') {
+                    fs::create_dir_all(&outpath)?;
+                } else {
+                    if let Some(p) = outpath.parent() {
+                        fs::create_dir_all(p)?;
+                    }
+                    let mut outfile = fs::File::create(&outpath)?;
+                    io::copy(file, &mut outfile)?;
+                }
+
+                Ok(())
+            }
+
+            #[allow(unused)]
+            fn visit_additional_metadata(
+                &mut self,
+                metadata: &ZipStreamFileMetadata,
+            ) -> ZipResult<()> {
+                #[cfg(unix)]
+                {
+                    let filepath = metadata
+                        .enclosed_name()
+                        .ok_or(ZipError::InvalidArchive("Invalid file path"))?;
+
+                    let outpath = self.0.join(filepath);
+
+                    use std::os::unix::fs::PermissionsExt;
+                    if let Some(mode) = metadata.unix_mode() {
+                        fs::set_permissions(outpath, fs::Permissions::from_mode(mode))?;
+                    }
+                }
+
+                Ok(())
+            }
+        }
+
+        self.visit(&mut Extractor(directory.as_ref()))
+    }
+}
+
+/// Visitor for ZipStreamReader
+pub trait ZipStreamVisitor {
+    ///  * `file` - contains the content of the file and most of the metadata,
+    ///    except:
+    ///     - `comment`: set to an empty string
+    ///     - `data_start`: set to 0
+    ///     - `external_attributes`: `unix_mode()`: will return None
+    fn visit_file(&mut self, file: &mut ZipFile<'_>) -> ZipResult<()>;
+
+    /// This function is guranteed to be called after all `visit_file`s.
+    ///
+    ///  * `metadata` - Provides missing metadata in `visit_file`.
+    fn visit_additional_metadata(&mut self, metadata: &ZipStreamFileMetadata) -> ZipResult<()>;
+}
+
+/// Additional metadata for the file.
+#[derive(Debug)]
+pub struct ZipStreamFileMetadata(ZipFileData);
+
+impl ZipStreamFileMetadata {
+    /// Get the name of the file
+    ///
+    /// # Warnings
+    ///
+    /// It is dangerous to use this name directly when extracting an archive.
+    /// It may contain an absolute path (`/etc/shadow`), or break out of the
+    /// current directory (`../runtime`). Carelessly writing to these paths
+    /// allows an attacker to craft a ZIP archive that will overwrite critical
+    /// files.
+    ///
+    /// You can use the [`ZipFile::enclosed_name`] method to validate the name
+    /// as a safe path.
+    pub fn name(&self) -> &str {
+        &self.0.file_name
+    }
+
+    /// Get the name of the file, in the raw (internal) byte representation.
+    ///
+    /// The encoding of this data is currently undefined.
+    pub fn name_raw(&self) -> &[u8] {
+        &self.0.file_name_raw
+    }
+
+    /// Rewrite the path, ignoring any path components with special meaning.
+    ///
+    /// - Absolute paths are made relative
+    /// - [`ParentDir`]s are ignored
+    /// - Truncates the filename at a NULL byte
+    ///
+    /// This is appropriate if you need to be able to extract *something* from
+    /// any archive, but will easily misrepresent trivial paths like
+    /// `foo/../bar` as `foo/bar` (instead of `bar`). Because of this,
+    /// [`ZipFile::enclosed_name`] is the better option in most scenarios.
+    ///
+    /// [`ParentDir`]: `Component::ParentDir`
+    pub fn mangled_name(&self) -> ::std::path::PathBuf {
+        self.0.file_name_sanitized()
+    }
+
+    /// Ensure the file path is safe to use as a [`Path`].
+    ///
+    /// - It can't contain NULL bytes
+    /// - It can't resolve to a path outside the current directory
+    ///   > `foo/../bar` is fine, `foo/../../bar` is not.
+    /// - It can't be an absolute path
+    ///
+    /// This will read well-formed ZIP files correctly, and is resistant
+    /// to path-based exploits. It is recommended over
+    /// [`ZipFile::mangled_name`].
+    pub fn enclosed_name(&self) -> Option<&Path> {
+        self.0.enclosed_name()
+    }
+
+    /// Returns whether the file is actually a directory
+    pub fn is_dir(&self) -> bool {
+        self.name()
+            .chars()
+            .rev()
+            .next()
+            .map_or(false, |c| c == '/' || c == '\\')
+    }
+
+    /// Returns whether the file is a regular file
+    pub fn is_file(&self) -> bool {
+        !self.is_dir()
+    }
+
+    /// Get the comment of the file
+    pub fn comment(&self) -> &str {
+        &self.0.file_comment
+    }
+
+    /// Get the starting offset of the data of the compressed file
+    pub fn data_start(&self) -> u64 {
+        self.0.data_start.load()
+    }
+
+    /// Get unix mode for the file
+    pub fn unix_mode(&self) -> Option<u32> {
+        self.0.unix_mode()
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use std::collections::BTreeSet;
+    use std::io;
+
+    struct DummyVisitor;
+    impl ZipStreamVisitor for DummyVisitor {
+        fn visit_file(&mut self, _file: &mut ZipFile<'_>) -> ZipResult<()> {
+            Ok(())
+        }
+
+        fn visit_additional_metadata(
+            &mut self,
+            _metadata: &ZipStreamFileMetadata,
+        ) -> ZipResult<()> {
+            Ok(())
+        }
+    }
+
+    #[derive(Default, Debug, Eq, PartialEq)]
+    struct CounterVisitor(u64, u64);
+    impl ZipStreamVisitor for CounterVisitor {
+        fn visit_file(&mut self, _file: &mut ZipFile<'_>) -> ZipResult<()> {
+            self.0 += 1;
+            Ok(())
+        }
+
+        fn visit_additional_metadata(
+            &mut self,
+            _metadata: &ZipStreamFileMetadata,
+        ) -> ZipResult<()> {
+            self.1 += 1;
+            Ok(())
+        }
+    }
+
+    #[test]
+    fn invalid_offset() {
+        ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/invalid_offset.zip"
+        )))
+        .visit(&mut DummyVisitor)
+        .unwrap_err();
+    }
+
+    #[test]
+    fn invalid_offset2() {
+        ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/invalid_offset2.zip"
+        )))
+        .visit(&mut DummyVisitor)
+        .unwrap_err();
+    }
+
+    #[test]
+    fn zip_read_streaming() {
+        let reader = ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/mimetype.zip"
+        )));
+
+        #[derive(Default)]
+        struct V {
+            filenames: BTreeSet<Box<str>>,
+        }
+        impl ZipStreamVisitor for V {
+            fn visit_file(&mut self, file: &mut ZipFile<'_>) -> ZipResult<()> {
+                if file.is_file() {
+                    self.filenames.insert(file.name().into());
+                }
+
+                Ok(())
+            }
+            fn visit_additional_metadata(
+                &mut self,
+                metadata: &ZipStreamFileMetadata,
+            ) -> ZipResult<()> {
+                if metadata.is_file() {
+                    assert!(
+                        self.filenames.contains(metadata.name()),
+                        "{} is missing its file content",
+                        metadata.name()
+                    );
+                }
+
+                Ok(())
+            }
+        }
+
+        reader.visit(&mut V::default()).unwrap();
+    }
+
+    #[test]
+    fn file_and_dir_predicates() {
+        let reader = ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/files_and_dirs.zip"
+        )));
+
+        #[derive(Default)]
+        struct V {
+            filenames: BTreeSet<Box<str>>,
+        }
+        impl ZipStreamVisitor for V {
+            fn visit_file(&mut self, file: &mut ZipFile<'_>) -> ZipResult<()> {
+                let full_name = file.enclosed_name().unwrap();
+                let file_name = full_name.file_name().unwrap().to_str().unwrap();
+                assert!(
+                    (file_name.starts_with("dir") && file.is_dir())
+                        || (file_name.starts_with("file") && file.is_file())
+                );
+
+                if file.is_file() {
+                    self.filenames.insert(file.name().into());
+                }
+
+                Ok(())
+            }
+            fn visit_additional_metadata(
+                &mut self,
+                metadata: &ZipStreamFileMetadata,
+            ) -> ZipResult<()> {
+                if metadata.is_file() {
+                    assert!(
+                        self.filenames.contains(metadata.name()),
+                        "{} is missing its file content",
+                        metadata.name()
+                    );
+                }
+
+                Ok(())
+            }
+        }
+
+        reader.visit(&mut V::default()).unwrap();
+    }
+
+    /// test case to ensure we don't preemptively over allocate based on the
+    /// declared number of files in the CDE of an invalid zip when the number of
+    /// files declared is more than the alleged offset in the CDE
+    #[test]
+    fn invalid_cde_number_of_files_allocation_smaller_offset() {
+        ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/invalid_cde_number_of_files_allocation_smaller_offset.zip"
+        )))
+        .visit(&mut DummyVisitor)
+        .unwrap_err();
+    }
+
+    /// test case to ensure we don't preemptively over allocate based on the
+    /// declared number of files in the CDE of an invalid zip when the number of
+    /// files declared is less than the alleged offset in the CDE
+    #[test]
+    fn invalid_cde_number_of_files_allocation_greater_offset() {
+        ZipStreamReader::new(io::Cursor::new(include_bytes!(
+            "../../tests/data/invalid_cde_number_of_files_allocation_greater_offset.zip"
+        )))
+        .visit(&mut DummyVisitor)
+        .unwrap_err();
+    }
+}