summaryrefslogtreecommitdiffstats
path: root/vendor/flate2/src/gz
diff options
context:
space:
mode:
Diffstat (limited to 'vendor/flate2/src/gz')
-rw-r--r--vendor/flate2/src/gz/bufread.rs483
-rw-r--r--vendor/flate2/src/gz/mod.rs644
-rw-r--r--vendor/flate2/src/gz/read.rs378
-rw-r--r--vendor/flate2/src/gz/write.rs641
4 files changed, 2146 insertions, 0 deletions
diff --git a/vendor/flate2/src/gz/bufread.rs b/vendor/flate2/src/gz/bufread.rs
new file mode 100644
index 0000000..679b4a7
--- /dev/null
+++ b/vendor/flate2/src/gz/bufread.rs
@@ -0,0 +1,483 @@
+use std::cmp;
+use std::io;
+use std::io::prelude::*;
+use std::mem;
+
+use super::{corrupt, read_into, GzBuilder, GzHeader, GzHeaderParser};
+use crate::crc::CrcReader;
+use crate::deflate;
+use crate::Compression;
+
+fn copy(into: &mut [u8], from: &[u8], pos: &mut usize) -> usize {
+ let min = cmp::min(into.len(), from.len() - *pos);
+ for (slot, val) in into.iter_mut().zip(from[*pos..*pos + min].iter()) {
+ *slot = *val;
+ }
+ *pos += min;
+ min
+}
+
+/// A gzip streaming encoder
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// uncompressed data from the underlying [`BufRead`] and provides the compressed data.
+///
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// use flate2::Compression;
+/// use flate2::bufread::GzEncoder;
+/// use std::fs::File;
+/// use std::io::BufReader;
+///
+/// // Opens sample file, compresses the contents and returns a Vector or error
+/// // File wrapped in a BufReader implements BufRead
+///
+/// fn open_hello_world() -> io::Result<Vec<u8>> {
+/// let f = File::open("examples/hello_world.txt")?;
+/// let b = BufReader::new(f);
+/// let mut gz = GzEncoder::new(b, Compression::fast());
+/// let mut buffer = Vec::new();
+/// gz.read_to_end(&mut buffer)?;
+/// Ok(buffer)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct GzEncoder<R> {
+ inner: deflate::bufread::DeflateEncoder<CrcReader<R>>,
+ header: Vec<u8>,
+ pos: usize,
+ eof: bool,
+}
+
+pub fn gz_encoder<R: BufRead>(header: Vec<u8>, r: R, lvl: Compression) -> GzEncoder<R> {
+ let crc = CrcReader::new(r);
+ GzEncoder {
+ inner: deflate::bufread::DeflateEncoder::new(crc, lvl),
+ header,
+ pos: 0,
+ eof: false,
+ }
+}
+
+impl<R: BufRead> GzEncoder<R> {
+ /// Creates a new encoder which will use the given compression level.
+ ///
+ /// The encoder is not configured specially for the emitted header. For
+ /// header configuration, see the `GzBuilder` type.
+ ///
+ /// The data read from the stream `r` will be compressed and available
+ /// through the returned reader.
+ pub fn new(r: R, level: Compression) -> GzEncoder<R> {
+ GzBuilder::new().buf_read(r, level)
+ }
+
+ fn read_footer(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ if self.pos == 8 {
+ return Ok(0);
+ }
+ let crc = self.inner.get_ref().crc();
+ let ref arr = [
+ (crc.sum() >> 0) as u8,
+ (crc.sum() >> 8) as u8,
+ (crc.sum() >> 16) as u8,
+ (crc.sum() >> 24) as u8,
+ (crc.amount() >> 0) as u8,
+ (crc.amount() >> 8) as u8,
+ (crc.amount() >> 16) as u8,
+ (crc.amount() >> 24) as u8,
+ ];
+ Ok(copy(into, arr, &mut self.pos))
+ }
+}
+
+impl<R> GzEncoder<R> {
+ /// Acquires a reference to the underlying reader.
+ pub fn get_ref(&self) -> &R {
+ self.inner.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying reader.
+ ///
+ /// Note that mutation of the reader may result in surprising results if
+ /// this encoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.inner.get_mut().get_mut()
+ }
+
+ /// Returns the underlying stream, consuming this encoder
+ pub fn into_inner(self) -> R {
+ self.inner.into_inner().into_inner()
+ }
+}
+
+#[inline]
+fn finish(buf: &[u8; 8]) -> (u32, u32) {
+ let crc = ((buf[0] as u32) << 0)
+ | ((buf[1] as u32) << 8)
+ | ((buf[2] as u32) << 16)
+ | ((buf[3] as u32) << 24);
+ let amt = ((buf[4] as u32) << 0)
+ | ((buf[5] as u32) << 8)
+ | ((buf[6] as u32) << 16)
+ | ((buf[7] as u32) << 24);
+ (crc, amt)
+}
+
+impl<R: BufRead> Read for GzEncoder<R> {
+ fn read(&mut self, mut into: &mut [u8]) -> io::Result<usize> {
+ let mut amt = 0;
+ if self.eof {
+ return self.read_footer(into);
+ } else if self.pos < self.header.len() {
+ amt += copy(into, &self.header, &mut self.pos);
+ if amt == into.len() {
+ return Ok(amt);
+ }
+ let tmp = into;
+ into = &mut tmp[amt..];
+ }
+ match self.inner.read(into)? {
+ 0 => {
+ self.eof = true;
+ self.pos = 0;
+ self.read_footer(into)
+ }
+ n => Ok(amt + n),
+ }
+ }
+}
+
+impl<R: BufRead + Write> Write for GzEncoder<R> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.get_mut().write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.get_mut().flush()
+ }
+}
+
+/// A decoder for a single member of a [gzip file].
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// compressed data from the underlying [`BufRead`] and provides the uncompressed data.
+///
+/// After reading a single member of the gzip data this reader will return
+/// Ok(0) even if there are more bytes available in the underlying reader.
+/// If you need the following bytes, call `into_inner()` after Ok(0) to
+/// recover the underlying reader.
+///
+/// To handle gzip files that may have multiple members, see [`MultiGzDecoder`]
+/// or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// # use flate2::Compression;
+/// # use flate2::write::GzEncoder;
+/// use flate2::bufread::GzDecoder;
+///
+/// # fn main() {
+/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// # e.write_all(b"Hello World").unwrap();
+/// # let bytes = e.finish().unwrap();
+/// # println!("{}", decode_reader(bytes).unwrap());
+/// # }
+/// #
+/// // Uncompresses a Gz Encoded vector of bytes and returns a string or error
+/// // Here &[u8] implements BufRead
+///
+/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
+/// let mut gz = GzDecoder::new(&bytes[..]);
+/// let mut s = String::new();
+/// gz.read_to_string(&mut s)?;
+/// Ok(s)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct GzDecoder<R> {
+ state: GzState,
+ reader: CrcReader<deflate::bufread::DeflateDecoder<R>>,
+ multi: bool,
+}
+
+#[derive(Debug)]
+enum GzState {
+ Header(GzHeaderParser),
+ Body(GzHeader),
+ Finished(GzHeader, usize, [u8; 8]),
+ Err(io::Error),
+ End(Option<GzHeader>),
+}
+
+impl<R: BufRead> GzDecoder<R> {
+ /// Creates a new decoder from the given reader, immediately parsing the
+ /// gzip header.
+ pub fn new(mut r: R) -> GzDecoder<R> {
+ let mut header_parser = GzHeaderParser::new();
+
+ let state = match header_parser.parse(&mut r) {
+ Ok(_) => GzState::Body(GzHeader::from(header_parser)),
+ Err(ref err) if io::ErrorKind::WouldBlock == err.kind() => {
+ GzState::Header(header_parser)
+ }
+ Err(err) => GzState::Err(err),
+ };
+
+ GzDecoder {
+ state,
+ reader: CrcReader::new(deflate::bufread::DeflateDecoder::new(r)),
+ multi: false,
+ }
+ }
+
+ fn multi(mut self, flag: bool) -> GzDecoder<R> {
+ self.multi = flag;
+ self
+ }
+}
+
+impl<R> GzDecoder<R> {
+ /// Returns the header associated with this stream, if it was valid
+ pub fn header(&self) -> Option<&GzHeader> {
+ match &self.state {
+ GzState::Body(header) | GzState::Finished(header, _, _) => Some(header),
+ GzState::End(header) => header.as_ref(),
+ _ => None,
+ }
+ }
+
+ /// Acquires a reference to the underlying reader.
+ pub fn get_ref(&self) -> &R {
+ self.reader.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying stream.
+ ///
+ /// Note that mutation of the stream may result in surprising results if
+ /// this decoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.reader.get_mut().get_mut()
+ }
+
+ /// Consumes this decoder, returning the underlying reader.
+ pub fn into_inner(self) -> R {
+ self.reader.into_inner().into_inner()
+ }
+}
+
+impl<R: BufRead> Read for GzDecoder<R> {
+ fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ loop {
+ match &mut self.state {
+ GzState::Header(parser) => {
+ parser.parse(self.reader.get_mut().get_mut())?;
+ self.state = GzState::Body(GzHeader::from(mem::take(parser)));
+ }
+ GzState::Body(header) => {
+ if into.is_empty() {
+ return Ok(0);
+ }
+ match self.reader.read(into)? {
+ 0 => {
+ self.state = GzState::Finished(mem::take(header), 0, [0; 8]);
+ }
+ n => {
+ return Ok(n);
+ }
+ }
+ }
+ GzState::Finished(header, pos, buf) => {
+ if *pos < buf.len() {
+ *pos += read_into(self.reader.get_mut().get_mut(), &mut buf[*pos..])?;
+ } else {
+ let (crc, amt) = finish(&buf);
+
+ if crc != self.reader.crc().sum() || amt != self.reader.crc().amount() {
+ self.state = GzState::End(Some(mem::take(header)));
+ return Err(corrupt());
+ } else if self.multi {
+ let is_eof = self
+ .reader
+ .get_mut()
+ .get_mut()
+ .fill_buf()
+ .map(|buf| buf.is_empty())?;
+
+ if is_eof {
+ self.state = GzState::End(Some(mem::take(header)));
+ } else {
+ self.reader.reset();
+ self.reader.get_mut().reset_data();
+ self.state = GzState::Header(GzHeaderParser::new())
+ }
+ } else {
+ self.state = GzState::End(Some(mem::take(header)));
+ }
+ }
+ }
+ GzState::Err(err) => {
+ let result = Err(mem::replace(err, io::ErrorKind::Other.into()));
+ self.state = GzState::End(None);
+ return result;
+ }
+ GzState::End(_) => return Ok(0),
+ }
+ }
+ }
+}
+
+impl<R: BufRead + Write> Write for GzDecoder<R> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.get_mut().write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.get_mut().flush()
+ }
+}
+
+/// A gzip streaming decoder that decodes a [gzip file] that may have multiple members.
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// compressed data from the underlying [`BufRead`] and provides the uncompressed data.
+///
+/// A gzip file consists of a series of *members* concatenated one after another.
+/// MultiGzDecoder decodes all members from the data and only returns Ok(0) when the
+/// underlying reader does. For a file, this reads to the end of the file.
+///
+/// To handle members seperately, see [GzDecoder] or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`BufRead`]: https://doc.rust-lang.org/std/io/trait.BufRead.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// # use flate2::Compression;
+/// # use flate2::write::GzEncoder;
+/// use flate2::bufread::MultiGzDecoder;
+///
+/// # fn main() {
+/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// # e.write_all(b"Hello World").unwrap();
+/// # let bytes = e.finish().unwrap();
+/// # println!("{}", decode_reader(bytes).unwrap());
+/// # }
+/// #
+/// // Uncompresses a Gz Encoded vector of bytes and returns a string or error
+/// // Here &[u8] implements BufRead
+///
+/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
+/// let mut gz = MultiGzDecoder::new(&bytes[..]);
+/// let mut s = String::new();
+/// gz.read_to_string(&mut s)?;
+/// Ok(s)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct MultiGzDecoder<R>(GzDecoder<R>);
+
+impl<R: BufRead> MultiGzDecoder<R> {
+ /// Creates a new decoder from the given reader, immediately parsing the
+ /// (first) gzip header. If the gzip stream contains multiple members all will
+ /// be decoded.
+ pub fn new(r: R) -> MultiGzDecoder<R> {
+ MultiGzDecoder(GzDecoder::new(r).multi(true))
+ }
+}
+
+impl<R> MultiGzDecoder<R> {
+ /// Returns the current header associated with this stream, if it's valid
+ pub fn header(&self) -> Option<&GzHeader> {
+ self.0.header()
+ }
+
+ /// Acquires a reference to the underlying reader.
+ pub fn get_ref(&self) -> &R {
+ self.0.get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying stream.
+ ///
+ /// Note that mutation of the stream may result in surprising results if
+ /// this decoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.0.get_mut()
+ }
+
+ /// Consumes this decoder, returning the underlying reader.
+ pub fn into_inner(self) -> R {
+ self.0.into_inner()
+ }
+}
+
+impl<R: BufRead> Read for MultiGzDecoder<R> {
+ fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ self.0.read(into)
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use crate::bufread::GzDecoder;
+ use crate::gz::write;
+ use crate::Compression;
+ use std::io::{Read, Write};
+
+ // GzDecoder consumes one gzip member and then returns 0 for subsequent reads, allowing any
+ // additional data to be consumed by the caller.
+ #[test]
+ fn decode_extra_data() {
+ let expected = "Hello World";
+
+ let compressed = {
+ let mut e = write::GzEncoder::new(Vec::new(), Compression::default());
+ e.write(expected.as_ref()).unwrap();
+ let mut b = e.finish().unwrap();
+ b.push(b'x');
+ b
+ };
+
+ let mut output = Vec::new();
+ let mut decoder = GzDecoder::new(compressed.as_slice());
+ let decoded_bytes = decoder.read_to_end(&mut output).unwrap();
+ assert_eq!(decoded_bytes, output.len());
+ let actual = std::str::from_utf8(&output).expect("String parsing error");
+ assert_eq!(
+ actual, expected,
+ "after decompression we obtain the original input"
+ );
+
+ output.clear();
+ assert_eq!(
+ decoder.read(&mut output).unwrap(),
+ 0,
+ "subsequent read of decoder returns 0, but inner reader can return additional data"
+ );
+ let mut reader = decoder.into_inner();
+ assert_eq!(
+ reader.read_to_end(&mut output).unwrap(),
+ 1,
+ "extra data is accessible in underlying buf-read"
+ );
+ assert_eq!(output, b"x");
+ }
+}
diff --git a/vendor/flate2/src/gz/mod.rs b/vendor/flate2/src/gz/mod.rs
new file mode 100644
index 0000000..31a6961
--- /dev/null
+++ b/vendor/flate2/src/gz/mod.rs
@@ -0,0 +1,644 @@
+use std::ffi::CString;
+use std::io::{BufRead, Error, ErrorKind, Read, Result, Write};
+use std::time;
+
+use crate::bufreader::BufReader;
+use crate::{Compression, Crc};
+
+pub static FHCRC: u8 = 1 << 1;
+pub static FEXTRA: u8 = 1 << 2;
+pub static FNAME: u8 = 1 << 3;
+pub static FCOMMENT: u8 = 1 << 4;
+pub static FRESERVED: u8 = 1 << 5 | 1 << 6 | 1 << 7;
+
+pub mod bufread;
+pub mod read;
+pub mod write;
+
+// The maximum length of the header filename and comment fields. More than
+// enough for these fields in reasonable use, but prevents possible attacks.
+const MAX_HEADER_BUF: usize = 65535;
+
+/// A structure representing the header of a gzip stream.
+///
+/// The header can contain metadata about the file that was compressed, if
+/// present.
+#[derive(PartialEq, Clone, Debug, Default)]
+pub struct GzHeader {
+ extra: Option<Vec<u8>>,
+ filename: Option<Vec<u8>>,
+ comment: Option<Vec<u8>>,
+ operating_system: u8,
+ mtime: u32,
+}
+
+impl GzHeader {
+ /// Returns the `filename` field of this gzip stream's header, if present.
+ pub fn filename(&self) -> Option<&[u8]> {
+ self.filename.as_ref().map(|s| &s[..])
+ }
+
+ /// Returns the `extra` field of this gzip stream's header, if present.
+ pub fn extra(&self) -> Option<&[u8]> {
+ self.extra.as_ref().map(|s| &s[..])
+ }
+
+ /// Returns the `comment` field of this gzip stream's header, if present.
+ pub fn comment(&self) -> Option<&[u8]> {
+ self.comment.as_ref().map(|s| &s[..])
+ }
+
+ /// Returns the `operating_system` field of this gzip stream's header.
+ ///
+ /// There are predefined values for various operating systems.
+ /// 255 means that the value is unknown.
+ pub fn operating_system(&self) -> u8 {
+ self.operating_system
+ }
+
+ /// This gives the most recent modification time of the original file being compressed.
+ ///
+ /// The time is in Unix format, i.e., seconds since 00:00:00 GMT, Jan. 1, 1970.
+ /// (Note that this may cause problems for MS-DOS and other systems that use local
+ /// rather than Universal time.) If the compressed data did not come from a file,
+ /// `mtime` is set to the time at which compression started.
+ /// `mtime` = 0 means no time stamp is available.
+ ///
+ /// The usage of `mtime` is discouraged because of Year 2038 problem.
+ pub fn mtime(&self) -> u32 {
+ self.mtime
+ }
+
+ /// Returns the most recent modification time represented by a date-time type.
+ /// Returns `None` if the value of the underlying counter is 0,
+ /// indicating no time stamp is available.
+ ///
+ ///
+ /// The time is measured as seconds since 00:00:00 GMT, Jan. 1 1970.
+ /// See [`mtime`](#method.mtime) for more detail.
+ pub fn mtime_as_datetime(&self) -> Option<time::SystemTime> {
+ if self.mtime == 0 {
+ None
+ } else {
+ let duration = time::Duration::new(u64::from(self.mtime), 0);
+ let datetime = time::UNIX_EPOCH + duration;
+ Some(datetime)
+ }
+ }
+}
+
+#[derive(Debug)]
+pub enum GzHeaderState {
+ Start(u8, [u8; 10]),
+ Xlen(Option<Box<Crc>>, u8, [u8; 2]),
+ Extra(Option<Box<Crc>>, u16),
+ Filename(Option<Box<Crc>>),
+ Comment(Option<Box<Crc>>),
+ Crc(Option<Box<Crc>>, u8, [u8; 2]),
+ Complete,
+}
+
+impl Default for GzHeaderState {
+ fn default() -> Self {
+ Self::Complete
+ }
+}
+
+#[derive(Debug, Default)]
+pub struct GzHeaderParser {
+ state: GzHeaderState,
+ flags: u8,
+ header: GzHeader,
+}
+
+impl GzHeaderParser {
+ fn new() -> Self {
+ GzHeaderParser {
+ state: GzHeaderState::Start(0, [0; 10]),
+ flags: 0,
+ header: GzHeader::default(),
+ }
+ }
+
+ fn parse<'a, R: Read>(&mut self, r: &'a mut R) -> Result<()> {
+ loop {
+ match &mut self.state {
+ GzHeaderState::Start(count, buffer) => {
+ while (*count as usize) < buffer.len() {
+ *count += read_into(r, &mut buffer[*count as usize..])? as u8;
+ }
+ // Gzip identification bytes
+ if buffer[0] != 0x1f || buffer[1] != 0x8b {
+ return Err(bad_header());
+ }
+ // Gzip compression method (8 = deflate)
+ if buffer[2] != 8 {
+ return Err(bad_header());
+ }
+ self.flags = buffer[3];
+ // RFC1952: "must give an error indication if any reserved bit is non-zero"
+ if self.flags & FRESERVED != 0 {
+ return Err(bad_header());
+ }
+ self.header.mtime = ((buffer[4] as u32) << 0)
+ | ((buffer[5] as u32) << 8)
+ | ((buffer[6] as u32) << 16)
+ | ((buffer[7] as u32) << 24);
+ let _xfl = buffer[8];
+ self.header.operating_system = buffer[9];
+ let crc = if self.flags & FHCRC != 0 {
+ let mut crc = Box::new(Crc::new());
+ crc.update(buffer);
+ Some(crc)
+ } else {
+ None
+ };
+ self.state = GzHeaderState::Xlen(crc, 0, [0; 2]);
+ }
+ GzHeaderState::Xlen(crc, count, buffer) => {
+ if self.flags & FEXTRA != 0 {
+ while (*count as usize) < buffer.len() {
+ *count += read_into(r, &mut buffer[*count as usize..])? as u8;
+ }
+ if let Some(crc) = crc {
+ crc.update(buffer);
+ }
+ let xlen = parse_le_u16(&buffer);
+ self.header.extra = Some(vec![0; xlen as usize]);
+ self.state = GzHeaderState::Extra(crc.take(), 0);
+ } else {
+ self.state = GzHeaderState::Filename(crc.take());
+ }
+ }
+ GzHeaderState::Extra(crc, count) => {
+ debug_assert!(self.header.extra.is_some());
+ let extra = self.header.extra.as_mut().unwrap();
+ while (*count as usize) < extra.len() {
+ *count += read_into(r, &mut extra[*count as usize..])? as u16;
+ }
+ if let Some(crc) = crc {
+ crc.update(extra);
+ }
+ self.state = GzHeaderState::Filename(crc.take());
+ }
+ GzHeaderState::Filename(crc) => {
+ if self.flags & FNAME != 0 {
+ let filename = self.header.filename.get_or_insert_with(Vec::new);
+ read_to_nul(r, filename)?;
+ if let Some(crc) = crc {
+ crc.update(filename);
+ crc.update(b"\0");
+ }
+ }
+ self.state = GzHeaderState::Comment(crc.take());
+ }
+ GzHeaderState::Comment(crc) => {
+ if self.flags & FCOMMENT != 0 {
+ let comment = self.header.comment.get_or_insert_with(Vec::new);
+ read_to_nul(r, comment)?;
+ if let Some(crc) = crc {
+ crc.update(comment);
+ crc.update(b"\0");
+ }
+ }
+ self.state = GzHeaderState::Crc(crc.take(), 0, [0; 2]);
+ }
+ GzHeaderState::Crc(crc, count, buffer) => {
+ if let Some(crc) = crc {
+ debug_assert!(self.flags & FHCRC != 0);
+ while (*count as usize) < buffer.len() {
+ *count += read_into(r, &mut buffer[*count as usize..])? as u8;
+ }
+ let stored_crc = parse_le_u16(&buffer);
+ let calced_crc = crc.sum() as u16;
+ if stored_crc != calced_crc {
+ return Err(corrupt());
+ }
+ }
+ self.state = GzHeaderState::Complete;
+ }
+ GzHeaderState::Complete => {
+ return Ok(());
+ }
+ }
+ }
+ }
+
+ fn header(&self) -> Option<&GzHeader> {
+ match self.state {
+ GzHeaderState::Complete => Some(&self.header),
+ _ => None,
+ }
+ }
+}
+
+impl From<GzHeaderParser> for GzHeader {
+ fn from(parser: GzHeaderParser) -> Self {
+ debug_assert!(matches!(parser.state, GzHeaderState::Complete));
+ parser.header
+ }
+}
+
+// Attempt to fill the `buffer` from `r`. Return the number of bytes read.
+// Return an error if EOF is read before the buffer is full. This differs
+// from `read` in that Ok(0) means that more data may be available.
+fn read_into<R: Read>(r: &mut R, buffer: &mut [u8]) -> Result<usize> {
+ debug_assert!(!buffer.is_empty());
+ match r.read(buffer) {
+ Ok(0) => Err(ErrorKind::UnexpectedEof.into()),
+ Ok(n) => Ok(n),
+ Err(ref e) if e.kind() == ErrorKind::Interrupted => Ok(0),
+ Err(e) => Err(e),
+ }
+}
+
+// Read `r` up to the first nul byte, pushing non-nul bytes to `buffer`.
+fn read_to_nul<R: Read>(r: &mut R, buffer: &mut Vec<u8>) -> Result<()> {
+ let mut bytes = r.bytes();
+ loop {
+ match bytes.next().transpose()? {
+ Some(byte) if byte == 0 => {
+ return Ok(());
+ }
+ Some(_) if buffer.len() == MAX_HEADER_BUF => {
+ return Err(Error::new(
+ ErrorKind::InvalidInput,
+ "gzip header field too long",
+ ));
+ }
+ Some(byte) => {
+ buffer.push(byte);
+ }
+ None => {
+ return Err(ErrorKind::UnexpectedEof.into());
+ }
+ }
+ }
+}
+
+fn parse_le_u16(buffer: &[u8; 2]) -> u16 {
+ (buffer[0] as u16) | ((buffer[1] as u16) << 8)
+}
+
+fn bad_header() -> Error {
+ Error::new(ErrorKind::InvalidInput, "invalid gzip header")
+}
+
+fn corrupt() -> Error {
+ Error::new(
+ ErrorKind::InvalidInput,
+ "corrupt gzip stream does not have a matching checksum",
+ )
+}
+
+/// A builder structure to create a new gzip Encoder.
+///
+/// This structure controls header configuration options such as the filename.
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// # use std::io;
+/// use std::fs::File;
+/// use flate2::GzBuilder;
+/// use flate2::Compression;
+///
+/// // GzBuilder opens a file and writes a sample string using GzBuilder pattern
+///
+/// # fn sample_builder() -> Result<(), io::Error> {
+/// let f = File::create("examples/hello_world.gz")?;
+/// let mut gz = GzBuilder::new()
+/// .filename("hello_world.txt")
+/// .comment("test file, please delete")
+/// .write(f, Compression::default());
+/// gz.write_all(b"hello world")?;
+/// gz.finish()?;
+/// # Ok(())
+/// # }
+/// ```
+#[derive(Debug)]
+pub struct GzBuilder {
+ extra: Option<Vec<u8>>,
+ filename: Option<CString>,
+ comment: Option<CString>,
+ operating_system: Option<u8>,
+ mtime: u32,
+}
+
+impl Default for GzBuilder {
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl GzBuilder {
+ /// Create a new blank builder with no header by default.
+ pub fn new() -> GzBuilder {
+ GzBuilder {
+ extra: None,
+ filename: None,
+ comment: None,
+ operating_system: None,
+ mtime: 0,
+ }
+ }
+
+ /// Configure the `mtime` field in the gzip header.
+ pub fn mtime(mut self, mtime: u32) -> GzBuilder {
+ self.mtime = mtime;
+ self
+ }
+
+ /// Configure the `operating_system` field in the gzip header.
+ pub fn operating_system(mut self, os: u8) -> GzBuilder {
+ self.operating_system = Some(os);
+ self
+ }
+
+ /// Configure the `extra` field in the gzip header.
+ pub fn extra<T: Into<Vec<u8>>>(mut self, extra: T) -> GzBuilder {
+ self.extra = Some(extra.into());
+ self
+ }
+
+ /// Configure the `filename` field in the gzip header.
+ ///
+ /// # Panics
+ ///
+ /// Panics if the `filename` slice contains a zero.
+ pub fn filename<T: Into<Vec<u8>>>(mut self, filename: T) -> GzBuilder {
+ self.filename = Some(CString::new(filename.into()).unwrap());
+ self
+ }
+
+ /// Configure the `comment` field in the gzip header.
+ ///
+ /// # Panics
+ ///
+ /// Panics if the `comment` slice contains a zero.
+ pub fn comment<T: Into<Vec<u8>>>(mut self, comment: T) -> GzBuilder {
+ self.comment = Some(CString::new(comment.into()).unwrap());
+ self
+ }
+
+ /// Consume this builder, creating a writer encoder in the process.
+ ///
+ /// The data written to the returned encoder will be compressed and then
+ /// written out to the supplied parameter `w`.
+ pub fn write<W: Write>(self, w: W, lvl: Compression) -> write::GzEncoder<W> {
+ write::gz_encoder(self.into_header(lvl), w, lvl)
+ }
+
+ /// Consume this builder, creating a reader encoder in the process.
+ ///
+ /// Data read from the returned encoder will be the compressed version of
+ /// the data read from the given reader.
+ pub fn read<R: Read>(self, r: R, lvl: Compression) -> read::GzEncoder<R> {
+ read::gz_encoder(self.buf_read(BufReader::new(r), lvl))
+ }
+
+ /// Consume this builder, creating a reader encoder in the process.
+ ///
+ /// Data read from the returned encoder will be the compressed version of
+ /// the data read from the given reader.
+ pub fn buf_read<R>(self, r: R, lvl: Compression) -> bufread::GzEncoder<R>
+ where
+ R: BufRead,
+ {
+ bufread::gz_encoder(self.into_header(lvl), r, lvl)
+ }
+
+ fn into_header(self, lvl: Compression) -> Vec<u8> {
+ let GzBuilder {
+ extra,
+ filename,
+ comment,
+ operating_system,
+ mtime,
+ } = self;
+ let mut flg = 0;
+ let mut header = vec![0u8; 10];
+ if let Some(v) = extra {
+ flg |= FEXTRA;
+ header.push((v.len() >> 0) as u8);
+ header.push((v.len() >> 8) as u8);
+ header.extend(v);
+ }
+ if let Some(filename) = filename {
+ flg |= FNAME;
+ header.extend(filename.as_bytes_with_nul().iter().copied());
+ }
+ if let Some(comment) = comment {
+ flg |= FCOMMENT;
+ header.extend(comment.as_bytes_with_nul().iter().copied());
+ }
+ header[0] = 0x1f;
+ header[1] = 0x8b;
+ header[2] = 8;
+ header[3] = flg;
+ header[4] = (mtime >> 0) as u8;
+ header[5] = (mtime >> 8) as u8;
+ header[6] = (mtime >> 16) as u8;
+ header[7] = (mtime >> 24) as u8;
+ header[8] = if lvl.0 >= Compression::best().0 {
+ 2
+ } else if lvl.0 <= Compression::fast().0 {
+ 4
+ } else {
+ 0
+ };
+
+ // Typically this byte indicates what OS the gz stream was created on,
+ // but in an effort to have cross-platform reproducible streams just
+ // default this value to 255. I'm not sure that if we "correctly" set
+ // this it'd do anything anyway...
+ header[9] = operating_system.unwrap_or(255);
+ header
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::io::prelude::*;
+
+ use super::{read, write, GzBuilder, GzHeaderParser};
+ use crate::{Compression, GzHeader};
+ use rand::{thread_rng, Rng};
+
+ #[test]
+ fn roundtrip() {
+ let mut e = write::GzEncoder::new(Vec::new(), Compression::default());
+ e.write_all(b"foo bar baz").unwrap();
+ let inner = e.finish().unwrap();
+ let mut d = read::GzDecoder::new(&inner[..]);
+ let mut s = String::new();
+ d.read_to_string(&mut s).unwrap();
+ assert_eq!(s, "foo bar baz");
+ }
+
+ #[test]
+ fn roundtrip_zero() {
+ let e = write::GzEncoder::new(Vec::new(), Compression::default());
+ let inner = e.finish().unwrap();
+ let mut d = read::GzDecoder::new(&inner[..]);
+ let mut s = String::new();
+ d.read_to_string(&mut s).unwrap();
+ assert_eq!(s, "");
+ }
+
+ #[test]
+ fn roundtrip_big() {
+ let mut real = Vec::new();
+ let mut w = write::GzEncoder::new(Vec::new(), Compression::default());
+ let v = crate::random_bytes().take(1024).collect::<Vec<_>>();
+ for _ in 0..200 {
+ let to_write = &v[..thread_rng().gen_range(0..v.len())];
+ real.extend(to_write.iter().copied());
+ w.write_all(to_write).unwrap();
+ }
+ let result = w.finish().unwrap();
+ let mut r = read::GzDecoder::new(&result[..]);
+ let mut v = Vec::new();
+ r.read_to_end(&mut v).unwrap();
+ assert_eq!(v, real);
+ }
+
+ #[test]
+ fn roundtrip_big2() {
+ let v = crate::random_bytes().take(1024 * 1024).collect::<Vec<_>>();
+ let mut r = read::GzDecoder::new(read::GzEncoder::new(&v[..], Compression::default()));
+ let mut res = Vec::new();
+ r.read_to_end(&mut res).unwrap();
+ assert_eq!(res, v);
+ }
+
+ // A Rust implementation of CRC that closely matches the C code in RFC1952.
+ // Only use this to create CRCs for tests.
+ struct Rfc1952Crc {
+ /* Table of CRCs of all 8-bit messages. */
+ crc_table: [u32; 256],
+ }
+
+ impl Rfc1952Crc {
+ fn new() -> Self {
+ let mut crc = Rfc1952Crc {
+ crc_table: [0; 256],
+ };
+ /* Make the table for a fast CRC. */
+ for n in 0usize..256 {
+ let mut c = n as u32;
+ for _k in 0..8 {
+ if c & 1 != 0 {
+ c = 0xedb88320 ^ (c >> 1);
+ } else {
+ c = c >> 1;
+ }
+ }
+ crc.crc_table[n] = c;
+ }
+ crc
+ }
+
+ /*
+ Update a running crc with the bytes buf and return
+ the updated crc. The crc should be initialized to zero. Pre- and
+ post-conditioning (one's complement) is performed within this
+ function so it shouldn't be done by the caller.
+ */
+ fn update_crc(&self, crc: u32, buf: &[u8]) -> u32 {
+ let mut c = crc ^ 0xffffffff;
+
+ for b in buf {
+ c = self.crc_table[(c as u8 ^ *b) as usize] ^ (c >> 8);
+ }
+ c ^ 0xffffffff
+ }
+
+ /* Return the CRC of the bytes buf. */
+ fn crc(&self, buf: &[u8]) -> u32 {
+ self.update_crc(0, buf)
+ }
+ }
+
+ #[test]
+ fn roundtrip_header() {
+ let mut header = GzBuilder::new()
+ .mtime(1234)
+ .operating_system(57)
+ .filename("filename")
+ .comment("comment")
+ .into_header(Compression::fast());
+
+ // Add a CRC to the header
+ header[3] = header[3] ^ super::FHCRC;
+ let rfc1952_crc = Rfc1952Crc::new();
+ let crc32 = rfc1952_crc.crc(&header);
+ let crc16 = crc32 as u16;
+ header.extend(&crc16.to_le_bytes());
+
+ let mut parser = GzHeaderParser::new();
+ parser.parse(&mut header.as_slice()).unwrap();
+ let actual = parser.header().unwrap();
+ assert_eq!(
+ actual,
+ &GzHeader {
+ extra: None,
+ filename: Some("filename".as_bytes().to_vec()),
+ comment: Some("comment".as_bytes().to_vec()),
+ operating_system: 57,
+ mtime: 1234
+ }
+ )
+ }
+
+ #[test]
+ fn fields() {
+ let r = vec![0, 2, 4, 6];
+ let e = GzBuilder::new()
+ .filename("foo.rs")
+ .comment("bar")
+ .extra(vec![0, 1, 2, 3])
+ .read(&r[..], Compression::default());
+ let mut d = read::GzDecoder::new(e);
+ assert_eq!(d.header().unwrap().filename(), Some(&b"foo.rs"[..]));
+ assert_eq!(d.header().unwrap().comment(), Some(&b"bar"[..]));
+ assert_eq!(d.header().unwrap().extra(), Some(&b"\x00\x01\x02\x03"[..]));
+ let mut res = Vec::new();
+ d.read_to_end(&mut res).unwrap();
+ assert_eq!(res, vec![0, 2, 4, 6]);
+ }
+
+ #[test]
+ fn keep_reading_after_end() {
+ let mut e = write::GzEncoder::new(Vec::new(), Compression::default());
+ e.write_all(b"foo bar baz").unwrap();
+ let inner = e.finish().unwrap();
+ let mut d = read::GzDecoder::new(&inner[..]);
+ let mut s = String::new();
+ d.read_to_string(&mut s).unwrap();
+ assert_eq!(s, "foo bar baz");
+ d.read_to_string(&mut s).unwrap();
+ assert_eq!(s, "foo bar baz");
+ }
+
+ #[test]
+ fn qc_reader() {
+ ::quickcheck::quickcheck(test as fn(_) -> _);
+
+ fn test(v: Vec<u8>) -> bool {
+ let r = read::GzEncoder::new(&v[..], Compression::default());
+ let mut r = read::GzDecoder::new(r);
+ let mut v2 = Vec::new();
+ r.read_to_end(&mut v2).unwrap();
+ v == v2
+ }
+ }
+
+ #[test]
+ fn flush_after_write() {
+ let mut f = write::GzEncoder::new(Vec::new(), Compression::default());
+ write!(f, "Hello world").unwrap();
+ f.flush().unwrap();
+ }
+}
diff --git a/vendor/flate2/src/gz/read.rs b/vendor/flate2/src/gz/read.rs
new file mode 100644
index 0000000..9dbadbd
--- /dev/null
+++ b/vendor/flate2/src/gz/read.rs
@@ -0,0 +1,378 @@
+use std::io;
+use std::io::prelude::*;
+
+use super::bufread;
+use super::{GzBuilder, GzHeader};
+use crate::bufreader::BufReader;
+use crate::Compression;
+
+/// A gzip streaming encoder
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// uncompressed data from the underlying [`Read`] and provides the compressed data.
+///
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// use flate2::Compression;
+/// use flate2::read::GzEncoder;
+///
+/// // Return a vector containing the GZ compressed version of hello world
+///
+/// fn gzencode_hello_world() -> io::Result<Vec<u8>> {
+/// let mut ret_vec = Vec::new();
+/// let bytestring = b"hello world";
+/// let mut gz = GzEncoder::new(&bytestring[..], Compression::fast());
+/// gz.read_to_end(&mut ret_vec)?;
+/// Ok(ret_vec)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct GzEncoder<R> {
+ inner: bufread::GzEncoder<BufReader<R>>,
+}
+
+pub fn gz_encoder<R: Read>(inner: bufread::GzEncoder<BufReader<R>>) -> GzEncoder<R> {
+ GzEncoder { inner }
+}
+
+impl<R: Read> GzEncoder<R> {
+ /// Creates a new encoder which will use the given compression level.
+ ///
+ /// The encoder is not configured specially for the emitted header. For
+ /// header configuration, see the `GzBuilder` type.
+ ///
+ /// The data read from the stream `r` will be compressed and available
+ /// through the returned reader.
+ pub fn new(r: R, level: Compression) -> GzEncoder<R> {
+ GzBuilder::new().read(r, level)
+ }
+}
+
+impl<R> GzEncoder<R> {
+ /// Acquires a reference to the underlying reader.
+ pub fn get_ref(&self) -> &R {
+ self.inner.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying reader.
+ ///
+ /// Note that mutation of the reader may result in surprising results if
+ /// this encoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.inner.get_mut().get_mut()
+ }
+
+ /// Returns the underlying stream, consuming this encoder
+ pub fn into_inner(self) -> R {
+ self.inner.into_inner().into_inner()
+ }
+}
+
+impl<R: Read> Read for GzEncoder<R> {
+ fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ self.inner.read(into)
+ }
+}
+
+impl<R: Read + Write> Write for GzEncoder<R> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.get_mut().write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.get_mut().flush()
+ }
+}
+
+/// A decoder for a single member of a [gzip file].
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// compressed data from the underlying [`Read`] and provides the uncompressed data.
+///
+/// After reading a single member of the gzip data this reader will return
+/// Ok(0) even if there are more bytes available in the underlying reader.
+/// `GzDecoder` may have read additional bytes past the end of the gzip data.
+/// If you need the following bytes, wrap the `Reader` in a `std::io::BufReader`
+/// and use `bufread::GzDecoder` instead.
+///
+/// To handle gzip files that may have multiple members, see [`MultiGzDecoder`]
+/// or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// # use flate2::Compression;
+/// # use flate2::write::GzEncoder;
+/// use flate2::read::GzDecoder;
+///
+/// # fn main() {
+/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// # e.write_all(b"Hello World").unwrap();
+/// # let bytes = e.finish().unwrap();
+/// # println!("{}", decode_reader(bytes).unwrap());
+/// # }
+/// #
+/// // Uncompresses a Gz Encoded vector of bytes and returns a string or error
+/// // Here &[u8] implements Read
+///
+/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
+/// let mut gz = GzDecoder::new(&bytes[..]);
+/// let mut s = String::new();
+/// gz.read_to_string(&mut s)?;
+/// Ok(s)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct GzDecoder<R> {
+ inner: bufread::GzDecoder<BufReader<R>>,
+}
+
+impl<R: Read> GzDecoder<R> {
+ /// Creates a new decoder from the given reader, immediately parsing the
+ /// gzip header.
+ pub fn new(r: R) -> GzDecoder<R> {
+ GzDecoder {
+ inner: bufread::GzDecoder::new(BufReader::new(r)),
+ }
+ }
+}
+
+impl<R> GzDecoder<R> {
+ /// Returns the header associated with this stream, if it was valid.
+ pub fn header(&self) -> Option<&GzHeader> {
+ self.inner.header()
+ }
+
+ /// Acquires a reference to the underlying reader.
+ ///
+ /// Note that the decoder may have read past the end of the gzip data.
+ /// To prevent this use [`bufread::GzDecoder`] instead.
+ pub fn get_ref(&self) -> &R {
+ self.inner.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying stream.
+ ///
+ /// Note that mutation of the stream may result in surprising results if
+ /// this decoder continues to be used.
+ ///
+ /// Note that the decoder may have read past the end of the gzip data.
+ /// To prevent this use [`bufread::GzDecoder`] instead.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.inner.get_mut().get_mut()
+ }
+
+ /// Consumes this decoder, returning the underlying reader.
+ ///
+ /// Note that the decoder may have read past the end of the gzip data.
+ /// Subsequent reads will skip those bytes. To prevent this use
+ /// [`bufread::GzDecoder`] instead.
+ pub fn into_inner(self) -> R {
+ self.inner.into_inner().into_inner()
+ }
+}
+
+impl<R: Read> Read for GzDecoder<R> {
+ fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ self.inner.read(into)
+ }
+}
+
+impl<R: Read + Write> Write for GzDecoder<R> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.get_mut().write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.get_mut().flush()
+ }
+}
+
+/// A gzip streaming decoder that decodes a [gzip file] that may have multiple members.
+///
+/// This structure implements a [`Read`] interface. When read from, it reads
+/// compressed data from the underlying [`Read`] and provides the uncompressed
+/// data.
+///
+/// A gzip file consists of a series of *members* concatenated one after another.
+/// MultiGzDecoder decodes all members of a file and returns Ok(0) once the
+/// underlying reader does.
+///
+/// To handle members seperately, see [GzDecoder] or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// # use flate2::Compression;
+/// # use flate2::write::GzEncoder;
+/// use flate2::read::MultiGzDecoder;
+///
+/// # fn main() {
+/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// # e.write_all(b"Hello World").unwrap();
+/// # let bytes = e.finish().unwrap();
+/// # println!("{}", decode_reader(bytes).unwrap());
+/// # }
+/// #
+/// // Uncompresses a Gz Encoded vector of bytes and returns a string or error
+/// // Here &[u8] implements Read
+///
+/// fn decode_reader(bytes: Vec<u8>) -> io::Result<String> {
+/// let mut gz = MultiGzDecoder::new(&bytes[..]);
+/// let mut s = String::new();
+/// gz.read_to_string(&mut s)?;
+/// Ok(s)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct MultiGzDecoder<R> {
+ inner: bufread::MultiGzDecoder<BufReader<R>>,
+}
+
+impl<R: Read> MultiGzDecoder<R> {
+ /// Creates a new decoder from the given reader, immediately parsing the
+ /// (first) gzip header. If the gzip stream contains multiple members all will
+ /// be decoded.
+ pub fn new(r: R) -> MultiGzDecoder<R> {
+ MultiGzDecoder {
+ inner: bufread::MultiGzDecoder::new(BufReader::new(r)),
+ }
+ }
+}
+
+impl<R> MultiGzDecoder<R> {
+ /// Returns the current header associated with this stream, if it's valid.
+ pub fn header(&self) -> Option<&GzHeader> {
+ self.inner.header()
+ }
+
+ /// Acquires a reference to the underlying reader.
+ pub fn get_ref(&self) -> &R {
+ self.inner.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying stream.
+ ///
+ /// Note that mutation of the stream may result in surprising results if
+ /// this decoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut R {
+ self.inner.get_mut().get_mut()
+ }
+
+ /// Consumes this decoder, returning the underlying reader.
+ pub fn into_inner(self) -> R {
+ self.inner.into_inner().into_inner()
+ }
+}
+
+impl<R: Read> Read for MultiGzDecoder<R> {
+ fn read(&mut self, into: &mut [u8]) -> io::Result<usize> {
+ self.inner.read(into)
+ }
+}
+
+impl<R: Read + Write> Write for MultiGzDecoder<R> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ self.get_mut().write(buf)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.get_mut().flush()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::io::{Cursor, ErrorKind, Read, Result, Write};
+
+ use super::GzDecoder;
+
+ //a cursor turning EOF into blocking errors
+ #[derive(Debug)]
+ pub struct BlockingCursor {
+ pub cursor: Cursor<Vec<u8>>,
+ }
+
+ impl BlockingCursor {
+ pub fn new() -> BlockingCursor {
+ BlockingCursor {
+ cursor: Cursor::new(Vec::new()),
+ }
+ }
+
+ pub fn set_position(&mut self, pos: u64) {
+ return self.cursor.set_position(pos);
+ }
+ }
+
+ impl Write for BlockingCursor {
+ fn write(&mut self, buf: &[u8]) -> Result<usize> {
+ return self.cursor.write(buf);
+ }
+ fn flush(&mut self) -> Result<()> {
+ return self.cursor.flush();
+ }
+ }
+
+ impl Read for BlockingCursor {
+ fn read(&mut self, buf: &mut [u8]) -> Result<usize> {
+ //use the cursor, except it turns eof into blocking error
+ let r = self.cursor.read(buf);
+ match r {
+ Err(ref err) => {
+ if err.kind() == ErrorKind::UnexpectedEof {
+ return Err(ErrorKind::WouldBlock.into());
+ }
+ }
+ Ok(0) => {
+ //regular EOF turned into blocking error
+ return Err(ErrorKind::WouldBlock.into());
+ }
+ Ok(_n) => {}
+ }
+ return r;
+ }
+ }
+
+ #[test]
+ fn blocked_partial_header_read() {
+ // this is a reader which receives data afterwards
+ let mut r = BlockingCursor::new();
+ let data = vec![1, 2, 3];
+
+ match r.write_all(&data) {
+ Ok(()) => {}
+ _ => {
+ panic!("Unexpected result for write_all");
+ }
+ }
+ r.set_position(0);
+
+ // this is unused except for the buffering
+ let mut decoder = GzDecoder::new(r);
+ let mut out = Vec::with_capacity(7);
+ match decoder.read(&mut out) {
+ Err(e) => {
+ assert_eq!(e.kind(), ErrorKind::WouldBlock);
+ }
+ _ => {
+ panic!("Unexpected result for decoder.read");
+ }
+ }
+ }
+}
diff --git a/vendor/flate2/src/gz/write.rs b/vendor/flate2/src/gz/write.rs
new file mode 100644
index 0000000..74d6c5a
--- /dev/null
+++ b/vendor/flate2/src/gz/write.rs
@@ -0,0 +1,641 @@
+use std::cmp;
+use std::io;
+use std::io::prelude::*;
+
+use super::{corrupt, GzBuilder, GzHeader, GzHeaderParser};
+use crate::crc::{Crc, CrcWriter};
+use crate::zio;
+use crate::{Compress, Compression, Decompress, Status};
+
+/// A gzip streaming encoder
+///
+/// This structure exposes a [`Write`] interface that will emit compressed data
+/// to the underlying writer `W`.
+///
+/// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use flate2::Compression;
+/// use flate2::write::GzEncoder;
+///
+/// // Vec<u8> implements Write to print the compressed bytes of sample string
+/// # fn main() {
+///
+/// let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// e.write_all(b"Hello World").unwrap();
+/// println!("{:?}", e.finish().unwrap());
+/// # }
+/// ```
+#[derive(Debug)]
+pub struct GzEncoder<W: Write> {
+ inner: zio::Writer<W, Compress>,
+ crc: Crc,
+ crc_bytes_written: usize,
+ header: Vec<u8>,
+}
+
+pub fn gz_encoder<W: Write>(header: Vec<u8>, w: W, lvl: Compression) -> GzEncoder<W> {
+ GzEncoder {
+ inner: zio::Writer::new(w, Compress::new(lvl, false)),
+ crc: Crc::new(),
+ header,
+ crc_bytes_written: 0,
+ }
+}
+
+impl<W: Write> GzEncoder<W> {
+ /// Creates a new encoder which will use the given compression level.
+ ///
+ /// The encoder is not configured specially for the emitted header. For
+ /// header configuration, see the `GzBuilder` type.
+ ///
+ /// The data written to the returned encoder will be compressed and then
+ /// written to the stream `w`.
+ pub fn new(w: W, level: Compression) -> GzEncoder<W> {
+ GzBuilder::new().write(w, level)
+ }
+
+ /// Acquires a reference to the underlying writer.
+ pub fn get_ref(&self) -> &W {
+ self.inner.get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying writer.
+ ///
+ /// Note that mutation of the writer may result in surprising results if
+ /// this encoder is continued to be used.
+ pub fn get_mut(&mut self) -> &mut W {
+ self.inner.get_mut()
+ }
+
+ /// Attempt to finish this output stream, writing out final chunks of data.
+ ///
+ /// Note that this function can only be used once data has finished being
+ /// written to the output stream. After this function is called then further
+ /// calls to `write` may result in a panic.
+ ///
+ /// # Panics
+ ///
+ /// Attempts to write data to this stream may result in a panic after this
+ /// function is called.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to complete this stream, and any I/O
+ /// errors which occur will be returned from this function.
+ pub fn try_finish(&mut self) -> io::Result<()> {
+ self.write_header()?;
+ self.inner.finish()?;
+
+ while self.crc_bytes_written < 8 {
+ let (sum, amt) = (self.crc.sum(), self.crc.amount());
+ let buf = [
+ (sum >> 0) as u8,
+ (sum >> 8) as u8,
+ (sum >> 16) as u8,
+ (sum >> 24) as u8,
+ (amt >> 0) as u8,
+ (amt >> 8) as u8,
+ (amt >> 16) as u8,
+ (amt >> 24) as u8,
+ ];
+ let inner = self.inner.get_mut();
+ let n = inner.write(&buf[self.crc_bytes_written..])?;
+ self.crc_bytes_written += n;
+ }
+ Ok(())
+ }
+
+ /// Finish encoding this stream, returning the underlying writer once the
+ /// encoding is done.
+ ///
+ /// Note that this function may not be suitable to call in a situation where
+ /// the underlying stream is an asynchronous I/O stream. To finish a stream
+ /// the `try_finish` (or `shutdown`) method should be used instead. To
+ /// re-acquire ownership of a stream it is safe to call this method after
+ /// `try_finish` or `shutdown` has returned `Ok`.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to complete this stream, and any I/O
+ /// errors which occur will be returned from this function.
+ pub fn finish(mut self) -> io::Result<W> {
+ self.try_finish()?;
+ Ok(self.inner.take_inner())
+ }
+
+ fn write_header(&mut self) -> io::Result<()> {
+ while !self.header.is_empty() {
+ let n = self.inner.get_mut().write(&self.header)?;
+ self.header.drain(..n);
+ }
+ Ok(())
+ }
+}
+
+impl<W: Write> Write for GzEncoder<W> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ assert_eq!(self.crc_bytes_written, 0);
+ self.write_header()?;
+ let n = self.inner.write(buf)?;
+ self.crc.update(&buf[..n]);
+ Ok(n)
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ assert_eq!(self.crc_bytes_written, 0);
+ self.write_header()?;
+ self.inner.flush()
+ }
+}
+
+impl<R: Read + Write> Read for GzEncoder<R> {
+ fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+ self.get_mut().read(buf)
+ }
+}
+
+impl<W: Write> Drop for GzEncoder<W> {
+ fn drop(&mut self) {
+ if self.inner.is_present() {
+ let _ = self.try_finish();
+ }
+ }
+}
+
+/// A decoder for a single member of a [gzip file].
+///
+/// This structure exposes a [`Write`] interface, receiving compressed data and
+/// writing uncompressed data to the underlying writer.
+///
+/// After decoding a single member of the gzip data this writer will return the number of bytes up to
+/// to the end of the gzip member and subsequent writes will return Ok(0) allowing the caller to
+/// handle any data following the gzip member.
+///
+/// To handle gzip files that may have multiple members, see [`MultiGzDecoder`]
+/// or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+/// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+///
+/// # Examples
+///
+/// ```
+/// use std::io::prelude::*;
+/// use std::io;
+/// use flate2::Compression;
+/// use flate2::write::{GzEncoder, GzDecoder};
+///
+/// # fn main() {
+/// # let mut e = GzEncoder::new(Vec::new(), Compression::default());
+/// # e.write(b"Hello World").unwrap();
+/// # let bytes = e.finish().unwrap();
+/// # assert_eq!("Hello World", decode_writer(bytes).unwrap());
+/// # }
+/// // Uncompresses a gzip encoded vector of bytes and returns a string or error
+/// // Here Vec<u8> implements Write
+/// fn decode_writer(bytes: Vec<u8>) -> io::Result<String> {
+/// let mut writer = Vec::new();
+/// let mut decoder = GzDecoder::new(writer);
+/// decoder.write_all(&bytes[..])?;
+/// writer = decoder.finish()?;
+/// let return_string = String::from_utf8(writer).expect("String parsing error");
+/// Ok(return_string)
+/// }
+/// ```
+#[derive(Debug)]
+pub struct GzDecoder<W: Write> {
+ inner: zio::Writer<CrcWriter<W>, Decompress>,
+ crc_bytes: Vec<u8>,
+ header_parser: GzHeaderParser,
+}
+
+const CRC_BYTES_LEN: usize = 8;
+
+impl<W: Write> GzDecoder<W> {
+ /// Creates a new decoder which will write uncompressed data to the stream.
+ ///
+ /// When this encoder is dropped or unwrapped the final pieces of data will
+ /// be flushed.
+ pub fn new(w: W) -> GzDecoder<W> {
+ GzDecoder {
+ inner: zio::Writer::new(CrcWriter::new(w), Decompress::new(false)),
+ crc_bytes: Vec::with_capacity(CRC_BYTES_LEN),
+ header_parser: GzHeaderParser::new(),
+ }
+ }
+
+ /// Returns the header associated with this stream.
+ pub fn header(&self) -> Option<&GzHeader> {
+ self.header_parser.header()
+ }
+
+ /// Acquires a reference to the underlying writer.
+ pub fn get_ref(&self) -> &W {
+ self.inner.get_ref().get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying writer.
+ ///
+ /// Note that mutating the output/input state of the stream may corrupt this
+ /// object, so care must be taken when using this method.
+ pub fn get_mut(&mut self) -> &mut W {
+ self.inner.get_mut().get_mut()
+ }
+
+ /// Attempt to finish this output stream, writing out final chunks of data.
+ ///
+ /// Note that this function can only be used once data has finished being
+ /// written to the output stream. After this function is called then further
+ /// calls to `write` may result in a panic.
+ ///
+ /// # Panics
+ ///
+ /// Attempts to write data to this stream may result in a panic after this
+ /// function is called.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to finish the stream, returning any
+ /// errors which happen.
+ pub fn try_finish(&mut self) -> io::Result<()> {
+ self.finish_and_check_crc()?;
+ Ok(())
+ }
+
+ /// Consumes this decoder, flushing the output stream.
+ ///
+ /// This will flush the underlying data stream and then return the contained
+ /// writer if the flush succeeded.
+ ///
+ /// Note that this function may not be suitable to call in a situation where
+ /// the underlying stream is an asynchronous I/O stream. To finish a stream
+ /// the `try_finish` (or `shutdown`) method should be used instead. To
+ /// re-acquire ownership of a stream it is safe to call this method after
+ /// `try_finish` or `shutdown` has returned `Ok`.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to complete this stream, and any I/O
+ /// errors which occur will be returned from this function.
+ pub fn finish(mut self) -> io::Result<W> {
+ self.finish_and_check_crc()?;
+ Ok(self.inner.take_inner().into_inner())
+ }
+
+ fn finish_and_check_crc(&mut self) -> io::Result<()> {
+ self.inner.finish()?;
+
+ if self.crc_bytes.len() != 8 {
+ return Err(corrupt());
+ }
+
+ let crc = ((self.crc_bytes[0] as u32) << 0)
+ | ((self.crc_bytes[1] as u32) << 8)
+ | ((self.crc_bytes[2] as u32) << 16)
+ | ((self.crc_bytes[3] as u32) << 24);
+ let amt = ((self.crc_bytes[4] as u32) << 0)
+ | ((self.crc_bytes[5] as u32) << 8)
+ | ((self.crc_bytes[6] as u32) << 16)
+ | ((self.crc_bytes[7] as u32) << 24);
+ if crc != self.inner.get_ref().crc().sum() {
+ return Err(corrupt());
+ }
+ if amt != self.inner.get_ref().crc().amount() {
+ return Err(corrupt());
+ }
+ Ok(())
+ }
+}
+
+impl<W: Write> Write for GzDecoder<W> {
+ fn write(&mut self, mut buf: &[u8]) -> io::Result<usize> {
+ let buflen = buf.len();
+ if self.header().is_none() {
+ match self.header_parser.parse(&mut buf) {
+ Err(err) => {
+ if err.kind() == io::ErrorKind::UnexpectedEof {
+ // all data read but header still not complete
+ Ok(buflen)
+ } else {
+ Err(err)
+ }
+ }
+ Ok(_) => {
+ debug_assert!(self.header().is_some());
+ // buf now contains the unread part of the original buf
+ let n = buflen - buf.len();
+ Ok(n)
+ }
+ }
+ } else {
+ let (n, status) = self.inner.write_with_status(buf)?;
+
+ if status == Status::StreamEnd && n < buf.len() && self.crc_bytes.len() < 8 {
+ let remaining = buf.len() - n;
+ let crc_bytes = cmp::min(remaining, CRC_BYTES_LEN - self.crc_bytes.len());
+ self.crc_bytes.extend(&buf[n..n + crc_bytes]);
+ return Ok(n + crc_bytes);
+ }
+ Ok(n)
+ }
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.inner.flush()
+ }
+}
+
+impl<W: Read + Write> Read for GzDecoder<W> {
+ fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+ self.inner.get_mut().get_mut().read(buf)
+ }
+}
+
+/// A gzip streaming decoder that decodes a [gzip file] with multiple members.
+///
+/// This structure exposes a [`Write`] interface that will consume compressed data and
+/// write uncompressed data to the underlying writer.
+///
+/// A gzip file consists of a series of *members* concatenated one after another.
+/// `MultiGzDecoder` decodes all members of a file and writes them to the
+/// underlying writer one after another.
+///
+/// To handle members separately, see [GzDecoder] or read more
+/// [in the introduction](../index.html#about-multi-member-gzip-files).
+///
+/// [gzip file]: https://www.rfc-editor.org/rfc/rfc1952#page-5
+#[derive(Debug)]
+pub struct MultiGzDecoder<W: Write> {
+ inner: GzDecoder<W>,
+}
+
+impl<W: Write> MultiGzDecoder<W> {
+ /// Creates a new decoder which will write uncompressed data to the stream.
+ /// If the gzip stream contains multiple members all will be decoded.
+ pub fn new(w: W) -> MultiGzDecoder<W> {
+ MultiGzDecoder {
+ inner: GzDecoder::new(w),
+ }
+ }
+
+ /// Returns the header associated with the current member.
+ pub fn header(&self) -> Option<&GzHeader> {
+ self.inner.header()
+ }
+
+ /// Acquires a reference to the underlying writer.
+ pub fn get_ref(&self) -> &W {
+ self.inner.get_ref()
+ }
+
+ /// Acquires a mutable reference to the underlying writer.
+ ///
+ /// Note that mutating the output/input state of the stream may corrupt this
+ /// object, so care must be taken when using this method.
+ pub fn get_mut(&mut self) -> &mut W {
+ self.inner.get_mut()
+ }
+
+ /// Attempt to finish this output stream, writing out final chunks of data.
+ ///
+ /// Note that this function can only be used once data has finished being
+ /// written to the output stream. After this function is called then further
+ /// calls to `write` may result in a panic.
+ ///
+ /// # Panics
+ ///
+ /// Attempts to write data to this stream may result in a panic after this
+ /// function is called.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to finish the stream, returning any
+ /// errors which happen.
+ pub fn try_finish(&mut self) -> io::Result<()> {
+ self.inner.try_finish()
+ }
+
+ /// Consumes this decoder, flushing the output stream.
+ ///
+ /// This will flush the underlying data stream and then return the contained
+ /// writer if the flush succeeded.
+ ///
+ /// Note that this function may not be suitable to call in a situation where
+ /// the underlying stream is an asynchronous I/O stream. To finish a stream
+ /// the `try_finish` (or `shutdown`) method should be used instead. To
+ /// re-acquire ownership of a stream it is safe to call this method after
+ /// `try_finish` or `shutdown` has returned `Ok`.
+ ///
+ /// # Errors
+ ///
+ /// This function will perform I/O to complete this stream, and any I/O
+ /// errors which occur will be returned from this function.
+ pub fn finish(self) -> io::Result<W> {
+ self.inner.finish()
+ }
+}
+
+impl<W: Write> Write for MultiGzDecoder<W> {
+ fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+ if buf.is_empty() {
+ Ok(0)
+ } else {
+ match self.inner.write(buf) {
+ Ok(0) => {
+ // When the GzDecoder indicates that it has finished
+ // create a new GzDecoder to handle additional data.
+ self.inner.try_finish()?;
+ let w = self.inner.inner.take_inner().into_inner();
+ self.inner = GzDecoder::new(w);
+ self.inner.write(buf)
+ }
+ res => res,
+ }
+ }
+ }
+
+ fn flush(&mut self) -> io::Result<()> {
+ self.inner.flush()
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ const STR: &str = "Hello World Hello World Hello World Hello World Hello World \
+ Hello World Hello World Hello World Hello World Hello World \
+ Hello World Hello World Hello World Hello World Hello World \
+ Hello World Hello World Hello World Hello World Hello World \
+ Hello World Hello World Hello World Hello World Hello World";
+
+ #[test]
+ fn decode_writer_one_chunk() {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let bytes = e.finish().unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ let n = decoder.write(&bytes[..]).unwrap();
+ decoder.write(&bytes[n..]).unwrap();
+ decoder.try_finish().unwrap();
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ #[test]
+ fn decode_writer_partial_header() {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let bytes = e.finish().unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ assert_eq!(decoder.write(&bytes[..5]).unwrap(), 5);
+ let n = decoder.write(&bytes[5..]).unwrap();
+ if n < bytes.len() - 5 {
+ decoder.write(&bytes[n + 5..]).unwrap();
+ }
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ #[test]
+ fn decode_writer_partial_header_filename() {
+ let filename = "test.txt";
+ let mut e = GzBuilder::new()
+ .filename(filename)
+ .read(STR.as_bytes(), Compression::default());
+ let mut bytes = Vec::new();
+ e.read_to_end(&mut bytes).unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ assert_eq!(decoder.write(&bytes[..12]).unwrap(), 12);
+ let n = decoder.write(&bytes[12..]).unwrap();
+ if n < bytes.len() - 12 {
+ decoder.write(&bytes[n + 12..]).unwrap();
+ }
+ assert_eq!(
+ decoder.header().unwrap().filename().unwrap(),
+ filename.as_bytes()
+ );
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ #[test]
+ fn decode_writer_partial_header_comment() {
+ let comment = "test comment";
+ let mut e = GzBuilder::new()
+ .comment(comment)
+ .read(STR.as_bytes(), Compression::default());
+ let mut bytes = Vec::new();
+ e.read_to_end(&mut bytes).unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ assert_eq!(decoder.write(&bytes[..12]).unwrap(), 12);
+ let n = decoder.write(&bytes[12..]).unwrap();
+ if n < bytes.len() - 12 {
+ decoder.write(&bytes[n + 12..]).unwrap();
+ }
+ assert_eq!(
+ decoder.header().unwrap().comment().unwrap(),
+ comment.as_bytes()
+ );
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ #[test]
+ fn decode_writer_exact_header() {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let bytes = e.finish().unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ assert_eq!(decoder.write(&bytes[..10]).unwrap(), 10);
+ decoder.write(&bytes[10..]).unwrap();
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ #[test]
+ fn decode_writer_partial_crc() {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let bytes = e.finish().unwrap();
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ let l = bytes.len() - 5;
+ let n = decoder.write(&bytes[..l]).unwrap();
+ decoder.write(&bytes[n..]).unwrap();
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(return_string, STR);
+ }
+
+ // Two or more gzip files concatenated form a multi-member gzip file. MultiGzDecoder will
+ // concatenate the decoded contents of all members.
+ #[test]
+ fn decode_multi_writer() {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let bytes = e.finish().unwrap().repeat(2);
+
+ let mut writer = Vec::new();
+ let mut decoder = MultiGzDecoder::new(writer);
+ let mut count = 0;
+ while count < bytes.len() {
+ let n = decoder.write(&bytes[count..]).unwrap();
+ assert!(n != 0);
+ count += n;
+ }
+ writer = decoder.finish().unwrap();
+ let return_string = String::from_utf8(writer).expect("String parsing error");
+ let expected = STR.repeat(2);
+ assert_eq!(return_string, expected);
+ }
+
+ // GzDecoder consumes one gzip member and then returns 0 for subsequent writes, allowing any
+ // additional data to be consumed by the caller.
+ #[test]
+ fn decode_extra_data() {
+ let compressed = {
+ let mut e = GzEncoder::new(Vec::new(), Compression::default());
+ e.write(STR.as_ref()).unwrap();
+ let mut b = e.finish().unwrap();
+ b.push(b'x');
+ b
+ };
+
+ let mut writer = Vec::new();
+ let mut decoder = GzDecoder::new(writer);
+ let mut consumed_bytes = 0;
+ loop {
+ let n = decoder.write(&compressed[consumed_bytes..]).unwrap();
+ if n == 0 {
+ break;
+ }
+ consumed_bytes += n;
+ }
+ writer = decoder.finish().unwrap();
+ let actual = String::from_utf8(writer).expect("String parsing error");
+ assert_eq!(actual, STR);
+ assert_eq!(&compressed[consumed_bytes..], b"x");
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 00:42:41 +0000