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//! Validate that certain feature-gated functionality is still available.
#[cfg(feature = "any_zlib")]
use flate2::{Compress, Compression, Decompress, FlushCompress, FlushDecompress};
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
fn compress_new_with_window_bits_is_present_and_works() {
let string = "hello world".as_bytes();
// Test with window_bits = 9 (minimum)
let mut encoded = Vec::with_capacity(1024);
let mut encoder = Compress::new_with_window_bits(Compression::default(), true, 9);
encoder
.compress_vec(string, &mut encoded, FlushCompress::Finish)
.unwrap();
assert_ne!(encoded.len(), 0);
let mut decoder = Decompress::new_with_window_bits(true, 9);
let mut decoded = [0; 1024];
decoder
.decompress(&encoded, &mut decoded, FlushDecompress::Finish)
.unwrap();
assert_eq!(&decoded[..string.len()], string);
// Test with window_bits = 15 (maximum)
let mut encoded = Vec::with_capacity(1024);
let mut encoder = Compress::new_with_window_bits(Compression::default(), false, 15);
encoder
.compress_vec(string, &mut encoded, FlushCompress::Finish)
.unwrap();
assert_ne!(encoded.len(), 0);
let mut decoder = Decompress::new_with_window_bits(false, 15);
let mut decoded = [0; 1024];
decoder
.decompress(&encoded, &mut decoded, FlushDecompress::Finish)
.unwrap();
assert_eq!(&decoded[..string.len()], string);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
fn decompress_new_gzip_window_bits_is_present_and_works() {
let string = "hello world".as_bytes();
// Test with different window_bits values
for window_bits in [9, 12, 15] {
let mut encoded = Vec::with_capacity(1024);
let mut encoder = Compress::new_gzip(Compression::default(), window_bits);
encoder
.compress_vec(string, &mut encoded, FlushCompress::Finish)
.unwrap();
let mut decoder = Decompress::new_gzip(window_bits);
let mut decoded = [0; 1024];
decoder
.decompress(&encoded, &mut decoded, FlushDecompress::Finish)
.unwrap();
assert_eq!(
&decoded[..string.len()],
string,
"Failed with window_bits={}",
window_bits
);
}
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
#[should_panic(expected = "window_bits must be within 9 ..= 15")]
fn compress_new_with_window_bits_invalid_low() {
let _ = Compress::new_with_window_bits(Compression::default(), true, 8);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
#[should_panic(expected = "window_bits must be within 9 ..= 15")]
fn compress_new_with_window_bits_invalid_high() {
let _ = Compress::new_with_window_bits(Compression::default(), true, 16);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
#[should_panic(expected = "window_bits must be within 9 ..= 15")]
fn compress_new_gzip_invalid_low() {
let _ = Compress::new_gzip(Compression::default(), 8);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
#[should_panic(expected = "window_bits must be within 9 ..= 15")]
fn compress_new_gzip_invalid_high() {
let _ = Compress::new_gzip(Compression::default(), 16);
}
// Unsupported for `miniz_oxide`.
#[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);
}
// Unsupported for `miniz_oxide`.
#[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);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
fn compression_levels_are_effective() {
let input = b"hello hello hello hello hello hello hello hello";
// Compress with no compression
let mut encoded_none = Vec::new();
Compress::new(Compression::none(), true)
.compress_vec(input, &mut encoded_none, FlushCompress::Finish)
.unwrap();
// Compress with best compression
let mut encoded_best = Vec::new();
Compress::new(Compression::best(), true)
.compress_vec(input, &mut encoded_best, FlushCompress::Finish)
.unwrap();
assert!(
encoded_best.len() <= encoded_none.len(),
"best compression produced larger output than no compression: best={}, none={}",
encoded_best.len(),
encoded_none.len(),
);
}
// Unsupported for `miniz_oxide`.
#[cfg(feature = "any_zlib")]
#[test]
fn set_level_is_effective() {
let input = b"hello hello hello hello hello hello hello hello";
let no_compression = Compression::none();
let best_compression = Compression::best();
// Compress with no compression
let mut encoded_none = Vec::new();
let mut compress = Compress::new(best_compression, true);
compress.set_level(no_compression).unwrap();
compress
.compress_vec(input, &mut encoded_none, FlushCompress::Finish)
.unwrap();
// Compress with best compression
let mut encoded_best = Vec::new();
let mut compress = Compress::new(no_compression, true);
compress.set_level(best_compression).unwrap();
compress
.compress_vec(input, &mut encoded_best, FlushCompress::Finish)
.unwrap();
assert!(
encoded_best.len() <= encoded_none.len(),
"best compression produced larger output than no compression: best={}, none={}",
encoded_best.len(),
encoded_none.len(),
);
}
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