132 lines
4 KiB
Rust
132 lines
4 KiB
Rust
use crc32::Crc32Reader;
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use types::ZipFile;
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use compression;
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use spec;
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use reader_spec;
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use std::io;
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use std::io::{IoResult, IoError};
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use std::cell::RefCell;
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use flate2::FlateReader;
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/// Wrapper for reading the contents of a ZIP file.
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///
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/// ```
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/// fn doit() -> std::io::IoResult<()>
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/// {
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/// // For demonstration purposes we read from an empty buffer.
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/// // Normally a File object would be used.
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/// let buf = [0u8, 128];
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/// let mut reader = std::io::BufReader::new(&buf);
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///
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/// let zip = try!(zip::ZipReader::new(reader));
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///
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/// for file in zip.files()
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/// {
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/// println!("Filename: {}", file.file_name);
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/// let mut file_reader = try!(zip.read_file(file));
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/// let first_byte = try!(file_reader.read_byte());
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/// println!("{}", first_byte);
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/// }
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/// Ok(())
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/// }
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///
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/// println!("Result: {}", doit());
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/// ```
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pub struct ZipReader<T>
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{
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inner: RefCell<T>,
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files: Vec<ZipFile>,
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}
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fn unsupported_zip_error<T>(detail: &str) -> IoResult<T>
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{
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Err(IoError
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{
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kind: io::OtherIoError,
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desc: "This ZIP file is not supported",
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detail: Some(detail.to_string()),
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})
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}
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impl<T: Reader+Seek> ZipReader<T>
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{
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/// Opens a ZIP file and parses the content headers.
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pub fn new(mut reader: T) -> IoResult<ZipReader<T>>
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{
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let footer = try!(spec::CentralDirectoryEnd::find_and_parse(&mut reader));
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if footer.disk_number != footer.disk_with_central_directory { return unsupported_zip_error("Support for multi-disk files is not implemented") }
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let directory_start = footer.central_directory_offset as i64;
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let number_of_files = footer.number_of_files_on_this_disk as uint;
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let mut files = Vec::with_capacity(number_of_files);
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try!(reader.seek(directory_start, io::SeekSet));
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for i in range(0, number_of_files)
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{
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files.push(try!(reader_spec::central_header_to_zip_file(&mut reader)));
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}
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Ok(ZipReader { inner: RefCell::new(reader), files: files })
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}
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/// An iterator over the information of all contained files.
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pub fn files(&self) -> ::std::slice::Items<ZipFile>
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{
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self.files.as_slice().iter()
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}
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/// Gets a reader for a contained zipfile.
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///
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/// Possible errors:
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///
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/// * `ResourceUnavailable`: when another reader returned from this function is still active
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/// * `OtherIoError`: if the file is encrypted or has an unsupported compression
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pub fn read_file(&self, file: &ZipFile) -> IoResult<Box<Reader>>
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{
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let mut inner_reader = match self.inner.try_borrow_mut()
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{
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Some(reader) => reader,
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None => return Err(IoError
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{
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kind: io::ResourceUnavailable,
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desc: "There is already a ZIP reader active",
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detail: None
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}),
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};
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let pos = file.data_start as i64;
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if file.encrypted
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{
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return unsupported_zip_error("Encrypted files are not supported")
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}
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try!(inner_reader.seek(pos, io::SeekSet));
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let refmut_reader = ::util::RefMutReader::new(inner_reader);
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let limit_reader = io::util::LimitReader::new(refmut_reader, file.compressed_size as uint);
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let reader = match file.compression_method
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{
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compression::Stored =>
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{
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box
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Crc32Reader::new(
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limit_reader,
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file.crc32)
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as Box<Reader>
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},
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compression::Deflated =>
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{
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let deflate_reader = limit_reader.deflate_decode();
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box
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Crc32Reader::new(
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deflate_reader,
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file.crc32)
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as Box<Reader>
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},
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_ => return unsupported_zip_error("Compression method not supported"),
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};
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Ok(reader)
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}
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}
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