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+use std::error::Error;
+use std::fmt;
+use std::io;
+use std::slice;
+
+use crate::ffi::{self, Backend, Deflate, DeflateBackend, ErrorMessage, Inflate, InflateBackend};
+use crate::Compression;
+
+/// Raw in-memory compression stream for blocks of data.
+///
+/// This type is the building block for the I/O streams in the rest of this
+/// crate. It requires more management than the [`Read`]/[`Write`] API but is
+/// maximally flexible in terms of accepting input from any source and being
+/// able to produce output to any memory location.
+///
+/// It is recommended to use the I/O stream adaptors over this type as they're
+/// easier to use.
+///
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+#[derive(Debug)]
+pub struct Compress {
+ inner: Deflate,
+}
+
+/// Raw in-memory decompression stream for blocks of data.
+///
+/// This type is the building block for the I/O streams in the rest of this
+/// crate. It requires more management than the [`Read`]/[`Write`] API but is
+/// maximally flexible in terms of accepting input from any source and being
+/// able to produce output to any memory location.
+///
+/// It is recommended to use the I/O stream adaptors over this type as they're
+/// easier to use.
+///
+/// [`Read`]: https://doc.rust-lang.org/std/io/trait.Read.html
+/// [`Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
+#[derive(Debug)]
+pub struct Decompress {
+ inner: Inflate,
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+/// Values which indicate the form of flushing to be used when compressing
+/// in-memory data.
+pub enum FlushCompress {
+ /// A typical parameter for passing to compression/decompression functions,
+ /// this indicates that the underlying stream to decide how much data to
+ /// accumulate before producing output in order to maximize compression.
+ None = ffi::MZ_NO_FLUSH as isize,
+
+ /// All pending output is flushed to the output buffer and the output is
+ /// aligned on a byte boundary so that the decompressor can get all input
+ /// data available so far.
+ ///
+ /// Flushing may degrade compression for some compression algorithms and so
+ /// it should only be used when necessary. This will complete the current
+ /// deflate block and follow it with an empty stored block.
+ Sync = ffi::MZ_SYNC_FLUSH as isize,
+
+ /// All pending output is flushed to the output buffer, but the output is
+ /// not aligned to a byte boundary.
+ ///
+ /// All of the input data so far will be available to the decompressor (as
+ /// with `Flush::Sync`. This completes the current deflate block and follows
+ /// it with an empty fixed codes block that is 10 bites long, and it assures
+ /// that enough bytes are output in order for the decompressor to finish the
+ /// block before the empty fixed code block.
+ Partial = ffi::MZ_PARTIAL_FLUSH as isize,
+
+ /// All output is flushed as with `Flush::Sync` and the compression state is
+ /// reset so decompression can restart from this point if previous
+ /// compressed data has been damaged or if random access is desired.
+ ///
+ /// Using this option too often can seriously degrade compression.
+ Full = ffi::MZ_FULL_FLUSH as isize,
+
+ /// Pending input is processed and pending output is flushed.
+ ///
+ /// The return value may indicate that the stream is not yet done and more
+ /// data has yet to be processed.
+ Finish = ffi::MZ_FINISH as isize,
+
+ #[doc(hidden)]
+ _Nonexhaustive,
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+/// Values which indicate the form of flushing to be used when
+/// decompressing in-memory data.
+pub enum FlushDecompress {
+ /// A typical parameter for passing to compression/decompression functions,
+ /// this indicates that the underlying stream to decide how much data to
+ /// accumulate before producing output in order to maximize compression.
+ None = ffi::MZ_NO_FLUSH as isize,
+
+ /// All pending output is flushed to the output buffer and the output is
+ /// aligned on a byte boundary so that the decompressor can get all input
+ /// data available so far.
+ ///
+ /// Flushing may degrade compression for some compression algorithms and so
+ /// it should only be used when necessary. This will complete the current
+ /// deflate block and follow it with an empty stored block.
+ Sync = ffi::MZ_SYNC_FLUSH as isize,
+
+ /// Pending input is processed and pending output is flushed.
+ ///
+ /// The return value may indicate that the stream is not yet done and more
+ /// data has yet to be processed.
+ Finish = ffi::MZ_FINISH as isize,
+
+ #[doc(hidden)]
+ _Nonexhaustive,
+}
+
+/// The inner state for an error when decompressing
+#[derive(Debug)]
+pub(crate) enum DecompressErrorInner {
+ General { msg: ErrorMessage },
+ NeedsDictionary(u32),
+}
+
+/// Error returned when a decompression object finds that the input stream of
+/// bytes was not a valid input stream of bytes.
+#[derive(Debug)]
+pub struct DecompressError(pub(crate) DecompressErrorInner);
+
+impl DecompressError {
+ /// Indicates whether decompression failed due to requiring a dictionary.
+ ///
+ /// The resulting integer is the Adler-32 checksum of the dictionary
+ /// required.
+ pub fn needs_dictionary(&self) -> Option<u32> {
+ match self.0 {
+ DecompressErrorInner::NeedsDictionary(adler) => Some(adler),
+ _ => None,
+ }
+ }
+}
+
+#[inline]
+pub(crate) fn decompress_failed<T>(msg: ErrorMessage) -> Result<T, DecompressError> {
+ Err(DecompressError(DecompressErrorInner::General { msg }))
+}
+
+#[inline]
+pub(crate) fn decompress_need_dict<T>(adler: u32) -> Result<T, DecompressError> {
+ Err(DecompressError(DecompressErrorInner::NeedsDictionary(
+ adler,
+ )))
+}
+
+/// Error returned when a compression object is used incorrectly or otherwise
+/// generates an error.
+#[derive(Debug)]
+pub struct CompressError {
+ pub(crate) msg: ErrorMessage,
+}
+
+#[inline]
+pub(crate) fn compress_failed<T>(msg: ErrorMessage) -> Result<T, CompressError> {
+ Err(CompressError { msg })
+}
+
+/// Possible status results of compressing some data or successfully
+/// decompressing a block of data.
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+pub enum Status {
+ /// Indicates success.
+ ///
+ /// Means that more input may be needed but isn't available
+ /// and/or there's more output to be written but the output buffer is full.
+ Ok,
+
+ /// Indicates that forward progress is not possible due to input or output
+ /// buffers being empty.
+ ///
+ /// For compression it means the input buffer needs some more data or the
+ /// output buffer needs to be freed up before trying again.
+ ///
+ /// For decompression this means that more input is needed to continue or
+ /// the output buffer isn't large enough to contain the result. The function
+ /// can be called again after fixing both.
+ BufError,
+
+ /// Indicates that all input has been consumed and all output bytes have
+ /// been written. Decompression/compression should not be called again.
+ ///
+ /// For decompression with zlib streams the adler-32 of the decompressed
+ /// data has also been verified.
+ StreamEnd,
+}
+
+impl Compress {
+ /// Creates a new object ready for compressing data that it's given.
+ ///
+ /// The `level` argument here indicates what level of compression is going
+ /// to be performed, and the `zlib_header` argument indicates whether the
+ /// output data should have a zlib header or not.
+ pub fn new(level: Compression, zlib_header: bool) -> Compress {
+ Compress {
+ inner: Deflate::make(level, zlib_header, ffi::MZ_DEFAULT_WINDOW_BITS as u8),
+ }
+ }
+
+ /// Creates a new object ready for compressing data that it's given.
+ ///
+ /// The `level` argument here indicates what level of compression is going
+ /// to be performed, and the `zlib_header` argument indicates whether the
+ /// output data should have a zlib header or not. The `window_bits` parameter
+ /// indicates the base-2 logarithm of the sliding window size and must be
+ /// between 9 and 15.
+ ///
+ /// # Panics
+ ///
+ /// If `window_bits` does not fall into the range 9 ..= 15,
+ /// `new_with_window_bits` will panic.
+ ///
+ /// # Note
+ ///
+ /// This constructor is only available when the `zlib` feature is used.
+ /// Other backends currently do not support custom window bits.
+ #[cfg(feature = "any_zlib")]
+ pub fn new_with_window_bits(
+ level: Compression,
+ zlib_header: bool,
+ window_bits: u8,
+ ) -> Compress {
+ assert!(
+ window_bits > 8 && window_bits < 16,
+ "window_bits must be within 9 ..= 15"
+ );
+ Compress {
+ inner: Deflate::make(level, zlib_header, window_bits),
+ }
+ }
+
+ /// Creates a new object ready for compressing data that it's given.
+ ///
+ /// The `level` argument here indicates what level of compression is going
+ /// to be performed.
+ ///
+ /// The Compress object produced by this constructor outputs gzip headers
+ /// for the compressed data.
+ ///
+ /// # Panics
+ ///
+ /// If `window_bits` does not fall into the range 9 ..= 15,
+ /// `new_with_window_bits` will panic.
+ ///
+ /// # Note
+ ///
+ /// This constructor is only available when the `zlib` feature is used.
+ /// Other backends currently do not support gzip headers for Compress.
+ #[cfg(feature = "any_zlib")]
+ pub fn new_gzip(level: Compression, window_bits: u8) -> Compress {
+ assert!(
+ window_bits > 8 && window_bits < 16,
+ "window_bits must be within 9 ..= 15"
+ );
+ Compress {
+ inner: Deflate::make(level, true, window_bits + 16),
+ }
+ }
+
+ /// Returns the total number of input bytes which have been processed by
+ /// this compression object.
+ pub fn total_in(&self) -> u64 {
+ self.inner.total_in()
+ }
+
+ /// Returns the total number of output bytes which have been produced by
+ /// this compression object.
+ pub fn total_out(&self) -> u64 {
+ self.inner.total_out()
+ }
+
+ /// Specifies the compression dictionary to use.
+ ///
+ /// Returns the Adler-32 checksum of the dictionary.
+ #[cfg(feature = "any_zlib")]
+ pub fn set_dictionary(&mut self, dictionary: &[u8]) -> Result<u32, CompressError> {
+ let stream = &mut *self.inner.inner.stream_wrapper;
+ stream.msg = std::ptr::null_mut();
+ let rc = unsafe {
+ assert!(dictionary.len() < ffi::uInt::MAX as usize);
+ ffi::deflateSetDictionary(stream, dictionary.as_ptr(), dictionary.len() as ffi::uInt)
+ };
+
+ match rc {
+ ffi::MZ_STREAM_ERROR => compress_failed(self.inner.inner.msg()),
+ ffi::MZ_OK => Ok(stream.adler as u32),
+ c => panic!("unknown return code: {}", c),
+ }
+ }
+
+ /// Quickly resets this compressor without having to reallocate anything.
+ ///
+ /// This is equivalent to dropping this object and then creating a new one.
+ pub fn reset(&mut self) {
+ self.inner.reset();
+ }
+
+ /// Dynamically updates the compression level.
+ ///
+ /// This can be used to switch between compression levels for different
+ /// kinds of data, or it can be used in conjunction with a call to reset
+ /// to reuse the compressor.
+ ///
+ /// This may return an error if there wasn't enough output space to complete
+ /// the compression of the available input data before changing the
+ /// compression level. Flushing the stream before calling this method
+ /// ensures that the function will succeed on the first call.
+ #[cfg(feature = "any_zlib")]
+ pub fn set_level(&mut self, level: Compression) -> Result<(), CompressError> {
+ use std::os::raw::c_int;
+ let stream = &mut *self.inner.inner.stream_wrapper;
+ stream.msg = std::ptr::null_mut();
+
+ let rc = unsafe { ffi::deflateParams(stream, level.0 as c_int, ffi::MZ_DEFAULT_STRATEGY) };
+
+ match rc {
+ ffi::MZ_OK => Ok(()),
+ ffi::MZ_BUF_ERROR => compress_failed(self.inner.inner.msg()),
+ c => panic!("unknown return code: {}", c),
+ }
+ }
+
+ /// Compresses the input data into the output, consuming only as much
+ /// input as needed and writing as much output as possible.
+ ///
+ /// The flush option can be any of the available `FlushCompress` parameters.
+ ///
+ /// To learn how much data was consumed or how much output was produced, use
+ /// the `total_in` and `total_out` functions before/after this is called.
+ pub fn compress(
+ &mut self,
+ input: &[u8],
+ output: &mut [u8],
+ flush: FlushCompress,
+ ) -> Result<Status, CompressError> {
+ self.inner.compress(input, output, flush)
+ }
+
+ /// Compresses the input data into the extra space of the output, consuming
+ /// only as much input as needed and writing as much output as possible.
+ ///
+ /// This function has the same semantics as `compress`, except that the
+ /// length of `vec` is managed by this function. This will not reallocate
+ /// the vector provided or attempt to grow it, so space for the output must
+ /// be reserved in the output vector by the caller before calling this
+ /// function.
+ pub fn compress_vec(
+ &mut self,
+ input: &[u8],
+ output: &mut Vec<u8>,
+ flush: FlushCompress,
+ ) -> Result<Status, CompressError> {
+ let cap = output.capacity();
+ let len = output.len();
+
+ unsafe {
+ let before = self.total_out();
+ let ret = {
+ let ptr = output.as_mut_ptr().offset(len as isize);
+ let out = slice::from_raw_parts_mut(ptr, cap - len);
+ self.compress(input, out, flush)
+ };
+ output.set_len((self.total_out() - before) as usize + len);
+ ret
+ }
+ }
+}
+
+impl Decompress {
+ /// Creates a new object ready for decompressing data that it's given.
+ ///
+ /// The `zlib_header` argument indicates whether the input data is expected
+ /// to have a zlib header or not.
+ pub fn new(zlib_header: bool) -> Decompress {
+ Decompress {
+ inner: Inflate::make(zlib_header, ffi::MZ_DEFAULT_WINDOW_BITS as u8),
+ }
+ }
+
+ /// Creates a new object ready for decompressing data that it's given.
+ ///
+ /// The `zlib_header` argument indicates whether the input data is expected
+ /// to have a zlib header or not. The `window_bits` parameter indicates the
+ /// base-2 logarithm of the sliding window size and must be between 9 and 15.
+ ///
+ /// # Panics
+ ///
+ /// If `window_bits` does not fall into the range 9 ..= 15,
+ /// `new_with_window_bits` will panic.
+ ///
+ /// # Note
+ ///
+ /// This constructor is only available when the `zlib` feature is used.
+ /// Other backends currently do not support custom window bits.
+ #[cfg(feature = "any_zlib")]
+ pub fn new_with_window_bits(zlib_header: bool, window_bits: u8) -> Decompress {
+ assert!(
+ window_bits > 8 && window_bits < 16,
+ "window_bits must be within 9 ..= 15"
+ );
+ Decompress {
+ inner: Inflate::make(zlib_header, window_bits),
+ }
+ }
+
+ /// Creates a new object ready for decompressing data that it's given.
+ ///
+ /// The Decompress object produced by this constructor expects gzip headers
+ /// for the compressed data.
+ ///
+ /// # Panics
+ ///
+ /// If `window_bits` does not fall into the range 9 ..= 15,
+ /// `new_with_window_bits` will panic.
+ ///
+ /// # Note
+ ///
+ /// This constructor is only available when the `zlib` feature is used.
+ /// Other backends currently do not support gzip headers for Decompress.
+ #[cfg(feature = "any_zlib")]
+ pub fn new_gzip(window_bits: u8) -> Decompress {
+ assert!(
+ window_bits > 8 && window_bits < 16,
+ "window_bits must be within 9 ..= 15"
+ );
+ Decompress {
+ inner: Inflate::make(true, window_bits + 16),
+ }
+ }
+
+ /// Returns the total number of input bytes which have been processed by
+ /// this decompression object.
+ pub fn total_in(&self) -> u64 {
+ self.inner.total_in()
+ }
+
+ /// Returns the total number of output bytes which have been produced by
+ /// this decompression object.
+ pub fn total_out(&self) -> u64 {
+ self.inner.total_out()
+ }
+
+ /// Decompresses the input data into the output, consuming only as much
+ /// input as needed and writing as much output as possible.
+ ///
+ /// The flush option can be any of the available `FlushDecompress` parameters.
+ ///
+ /// If the first call passes `FlushDecompress::Finish` it is assumed that
+ /// the input and output buffers are both sized large enough to decompress
+ /// the entire stream in a single call.
+ ///
+ /// A flush value of `FlushDecompress::Finish` indicates that there are no
+ /// more source bytes available beside what's already in the input buffer,
+ /// and the output buffer is large enough to hold the rest of the
+ /// decompressed data.
+ ///
+ /// To learn how much data was consumed or how much output was produced, use
+ /// the `total_in` and `total_out` functions before/after this is called.
+ ///
+ /// # Errors
+ ///
+ /// If the input data to this instance of `Decompress` is not a valid
+ /// zlib/deflate stream then this function may return an instance of
+ /// `DecompressError` to indicate that the stream of input bytes is corrupted.
+ pub fn decompress(
+ &mut self,
+ input: &[u8],
+ output: &mut [u8],
+ flush: FlushDecompress,
+ ) -> Result<Status, DecompressError> {
+ self.inner.decompress(input, output, flush)
+ }
+
+ /// Decompresses the input data into the extra space in the output vector
+ /// specified by `output`.
+ ///
+ /// This function has the same semantics as `decompress`, except that the
+ /// length of `vec` is managed by this function. This will not reallocate
+ /// the vector provided or attempt to grow it, so space for the output must
+ /// be reserved in the output vector by the caller before calling this
+ /// function.
+ ///
+ /// # Errors
+ ///
+ /// If the input data to this instance of `Decompress` is not a valid
+ /// zlib/deflate stream then this function may return an instance of
+ /// `DecompressError` to indicate that the stream of input bytes is corrupted.
+ pub fn decompress_vec(
+ &mut self,
+ input: &[u8],
+ output: &mut Vec<u8>,
+ flush: FlushDecompress,
+ ) -> Result<Status, DecompressError> {
+ let cap = output.capacity();
+ let len = output.len();
+
+ unsafe {
+ let before = self.total_out();
+ let ret = {
+ let ptr = output.as_mut_ptr().offset(len as isize);
+ let out = slice::from_raw_parts_mut(ptr, cap - len);
+ self.decompress(input, out, flush)
+ };
+ output.set_len((self.total_out() - before) as usize + len);
+ ret
+ }
+ }
+
+ /// Specifies the decompression dictionary to use.
+ #[cfg(feature = "any_zlib")]
+ pub fn set_dictionary(&mut self, dictionary: &[u8]) -> Result<u32, DecompressError> {
+ let stream = &mut *self.inner.inner.stream_wrapper;
+ stream.msg = std::ptr::null_mut();
+ let rc = unsafe {
+ assert!(dictionary.len() < ffi::uInt::MAX as usize);
+ ffi::inflateSetDictionary(stream, dictionary.as_ptr(), dictionary.len() as ffi::uInt)
+ };
+
+ match rc {
+ ffi::MZ_STREAM_ERROR => decompress_failed(self.inner.inner.msg()),
+ ffi::MZ_DATA_ERROR => decompress_need_dict(stream.adler as u32),
+ ffi::MZ_OK => Ok(stream.adler as u32),
+ c => panic!("unknown return code: {}", c),
+ }
+ }
+
+ /// Performs the equivalent of replacing this decompression state with a
+ /// freshly allocated copy.
+ ///
+ /// This function may not allocate memory, though, and attempts to reuse any
+ /// previously existing resources.
+ ///
+ /// The argument provided here indicates whether the reset state will
+ /// attempt to decode a zlib header first or not.
+ pub fn reset(&mut self, zlib_header: bool) {
+ self.inner.reset(zlib_header);
+ }
+}
+
+impl Error for DecompressError {}
+
+impl DecompressError {
+ /// Retrieve the implementation's message about why the operation failed, if one exists.
+ pub fn message(&self) -> Option<&str> {
+ match &self.0 {
+ DecompressErrorInner::General { msg } => msg.get(),
+ _ => None,
+ }
+ }
+}
+
+impl From<DecompressError> for io::Error {
+ fn from(data: DecompressError) -> io::Error {
+ io::Error::new(io::ErrorKind::Other, data)
+ }
+}
+
+impl fmt::Display for DecompressError {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ let msg = match &self.0 {
+ DecompressErrorInner::General { msg } => msg.get(),
+ DecompressErrorInner::NeedsDictionary { .. } => Some("requires a dictionary"),
+ };
+ match msg {
+ Some(msg) => write!(f, "deflate decompression error: {}", msg),
+ None => write!(f, "deflate decompression error"),
+ }
+ }
+}
+
+impl Error for CompressError {}
+
+impl CompressError {
+ /// Retrieve the implementation's message about why the operation failed, if one exists.
+ pub fn message(&self) -> Option<&str> {
+ self.msg.get()
+ }
+}
+
+impl From<CompressError> for io::Error {
+ fn from(data: CompressError) -> io::Error {
+ io::Error::new(io::ErrorKind::Other, data)
+ }
+}
+
+impl fmt::Display for CompressError {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self.msg.get() {
+ Some(msg) => write!(f, "deflate compression error: {}", msg),
+ None => write!(f, "deflate compression error"),
+ }
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use std::io::Write;
+
+ use crate::write;
+ use crate::{Compression, Decompress, FlushDecompress};
+
+ #[cfg(feature = "any_zlib")]
+ use crate::{Compress, FlushCompress};
+
+ #[test]
+ fn issue51() {
+ let data = vec![
+ 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xb3, 0xc9, 0x28, 0xc9,
+ 0xcd, 0xb1, 0xe3, 0xe5, 0xb2, 0xc9, 0x48, 0x4d, 0x4c, 0xb1, 0xb3, 0x29, 0xc9, 0x2c,
+ 0xc9, 0x49, 0xb5, 0x33, 0x31, 0x30, 0x51, 0xf0, 0xcb, 0x2f, 0x51, 0x70, 0xcb, 0x2f,
+ 0xcd, 0x4b, 0xb1, 0xd1, 0x87, 0x08, 0xda, 0xe8, 0x83, 0x95, 0x00, 0x95, 0x26, 0xe5,
+ 0xa7, 0x54, 0x2a, 0x24, 0xa5, 0x27, 0xe7, 0xe7, 0xe4, 0x17, 0xd9, 0x2a, 0x95, 0x67,
+ 0x64, 0x96, 0xa4, 0x2a, 0x81, 0x8c, 0x48, 0x4e, 0xcd, 0x2b, 0x49, 0x2d, 0xb2, 0xb3,
+ 0xc9, 0x30, 0x44, 0x37, 0x01, 0x28, 0x62, 0xa3, 0x0f, 0x95, 0x06, 0xd9, 0x05, 0x54,
+ 0x04, 0xe5, 0xe5, 0xa5, 0x67, 0xe6, 0x55, 0xe8, 0x1b, 0xea, 0x99, 0xe9, 0x19, 0x21,
+ 0xab, 0xd0, 0x07, 0xd9, 0x01, 0x32, 0x53, 0x1f, 0xea, 0x3e, 0x00, 0x94, 0x85, 0xeb,
+ 0xe4, 0xa8, 0x00, 0x00, 0x00,
+ ];
+
+ let mut decoded = Vec::with_capacity(data.len() * 2);
+
+ let mut d = Decompress::new(false);
+ // decompressed whole deflate stream
+ assert!(d
+ .decompress_vec(&data[10..], &mut decoded, FlushDecompress::Finish)
+ .is_ok());
+
+ // decompress data that has nothing to do with the deflate stream (this
+ // used to panic)
+ drop(d.decompress_vec(&[0], &mut decoded, FlushDecompress::None));
+ }
+
+ #[test]
+ fn reset() {
+ let string = "hello world".as_bytes();
+ let mut zlib = Vec::new();
+ let mut deflate = Vec::new();
+
+ let comp = Compression::default();
+ write::ZlibEncoder::new(&mut zlib, comp)
+ .write_all(string)
+ .unwrap();
+ write::DeflateEncoder::new(&mut deflate, comp)
+ .write_all(string)
+ .unwrap();
+
+ let mut dst = [0; 1024];
+ let mut decoder = Decompress::new(true);
+ decoder
+ .decompress(&zlib, &mut dst, FlushDecompress::Finish)
+ .unwrap();
+ assert_eq!(decoder.total_out(), string.len() as u64);
+ assert!(dst.starts_with(string));
+
+ decoder.reset(false);
+ decoder
+ .decompress(&deflate, &mut dst, FlushDecompress::Finish)
+ .unwrap();
+ assert_eq!(decoder.total_out(), string.len() as u64);
+ assert!(dst.starts_with(string));
+ }
+
+ #[cfg(feature = "any_zlib")]
+ #[test]
+ fn set_dictionary_with_zlib_header() {
+ let string = "hello, hello!".as_bytes();
+ let dictionary = "hello".as_bytes();
+
+ let mut encoded = Vec::with_capacity(1024);
+
+ let mut encoder = Compress::new(Compression::default(), true);
+
+ let dictionary_adler = encoder.set_dictionary(&dictionary).unwrap();
+
+ encoder
+ .compress_vec(string, &mut encoded, FlushCompress::Finish)
+ .unwrap();
+
+ assert_eq!(encoder.total_in(), string.len() as u64);
+ assert_eq!(encoder.total_out(), encoded.len() as u64);
+
+ let mut decoder = Decompress::new(true);
+ let mut decoded = [0; 1024];
+ let decompress_error = decoder
+ .decompress(&encoded, &mut decoded, FlushDecompress::Finish)
+ .expect_err("decompression should fail due to requiring a dictionary");
+
+ let required_adler = decompress_error.needs_dictionary()
+ .expect("the first call to decompress should indicate a dictionary is required along with the required Adler-32 checksum");
+
+ assert_eq!(required_adler, dictionary_adler,
+ "the Adler-32 checksum should match the value when the dictionary was set on the compressor");
+
+ let actual_adler = decoder.set_dictionary(&dictionary).unwrap();
+
+ assert_eq!(required_adler, actual_adler);
+
+ // Decompress the rest of the input to the remainder of the output buffer
+ let total_in = decoder.total_in();
+ let total_out = decoder.total_out();
+
+ let decompress_result = decoder.decompress(
+ &encoded[total_in as usize..],
+ &mut decoded[total_out as usize..],
+ FlushDecompress::Finish,
+ );
+ assert!(decompress_result.is_ok());
+
+ assert_eq!(&decoded[..decoder.total_out() as usize], string);
+ }
+
+ #[cfg(feature = "any_zlib")]
+ #[test]
+ fn set_dictionary_raw() {
+ let string = "hello, hello!".as_bytes();
+ let dictionary = "hello".as_bytes();
+
+ let mut encoded = Vec::with_capacity(1024);
+
+ let mut encoder = Compress::new(Compression::default(), false);
+
+ encoder.set_dictionary(&dictionary).unwrap();
+
+ encoder
+ .compress_vec(string, &mut encoded, FlushCompress::Finish)
+ .unwrap();
+
+ assert_eq!(encoder.total_in(), string.len() as u64);
+ assert_eq!(encoder.total_out(), encoded.len() as u64);
+
+ let mut decoder = Decompress::new(false);
+
+ decoder.set_dictionary(&dictionary).unwrap();
+
+ let mut decoded = [0; 1024];
+ let decompress_result = decoder.decompress(&encoded, &mut decoded, FlushDecompress::Finish);
+
+ assert!(decompress_result.is_ok());
+
+ assert_eq!(&decoded[..decoder.total_out() as usize], string);
+ }
+
+ #[cfg(feature = "any_zlib")]
+ #[test]
+ fn test_gzip_flate() {
+ let string = "hello, hello!".as_bytes();
+
+ let mut encoded = Vec::with_capacity(1024);
+
+ let mut encoder = Compress::new_gzip(Compression::default(), 9);
+
+ encoder
+ .compress_vec(string, &mut encoded, FlushCompress::Finish)
+ .unwrap();
+
+ assert_eq!(encoder.total_in(), string.len() as u64);
+ assert_eq!(encoder.total_out(), encoded.len() as u64);
+
+ let mut decoder = Decompress::new_gzip(9);
+
+ let mut decoded = [0; 1024];
+ decoder
+ .decompress(&encoded, &mut decoded, FlushDecompress::Finish)
+ .unwrap();
+
+ assert_eq!(&decoded[..decoder.total_out() as usize], string);
+ }
+
+ #[cfg(feature = "any_zlib")]
+ #[test]
+ fn test_error_message() {
+ let mut decoder = Decompress::new(false);
+ let mut decoded = [0; 128];
+ let garbage = b"xbvxzi";
+
+ let err = decoder
+ .decompress(&*garbage, &mut decoded, FlushDecompress::Finish)
+ .unwrap_err();
+
+ assert_eq!(err.message(), Some("invalid stored block lengths"));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-24 13:25:19 +0000