base_d/
compression.rs

1use std::io::{Read, Write};
2
3/// Supported compression algorithms.
4#[derive(Debug, Clone, Copy, PartialEq, Eq)]
5pub enum CompressionAlgorithm {
6    Gzip,
7    Zstd,
8    Brotli,
9    Lz4,
10    Snappy,
11    Lzma,
12}
13
14impl CompressionAlgorithm {
15    /// Parse compression algorithm from string.
16    pub fn from_str(s: &str) -> Result<Self, String> {
17        match s.to_lowercase().as_str() {
18            "gzip" | "gz" => Ok(CompressionAlgorithm::Gzip),
19            "zstd" | "zst" => Ok(CompressionAlgorithm::Zstd),
20            "brotli" | "br" => Ok(CompressionAlgorithm::Brotli),
21            "lz4" => Ok(CompressionAlgorithm::Lz4),
22            "snappy" | "snap" => Ok(CompressionAlgorithm::Snappy),
23            "lzma" | "xz" => Ok(CompressionAlgorithm::Lzma),
24            _ => Err(format!("Unknown compression algorithm: {}", s)),
25        }
26    }
27    
28    pub fn as_str(&self) -> &str {
29        match self {
30            CompressionAlgorithm::Gzip => "gzip",
31            CompressionAlgorithm::Zstd => "zstd",
32            CompressionAlgorithm::Brotli => "brotli",
33            CompressionAlgorithm::Lz4 => "lz4",
34            CompressionAlgorithm::Snappy => "snappy",
35            CompressionAlgorithm::Lzma => "lzma",
36        }
37    }
38}
39
40/// Compress data using the specified algorithm and level.
41pub fn compress(data: &[u8], algorithm: CompressionAlgorithm, level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
42    match algorithm {
43        CompressionAlgorithm::Gzip => compress_gzip(data, level),
44        CompressionAlgorithm::Zstd => compress_zstd(data, level),
45        CompressionAlgorithm::Brotli => compress_brotli(data, level),
46        CompressionAlgorithm::Lz4 => compress_lz4(data, level),
47        CompressionAlgorithm::Snappy => compress_snappy(data, level),
48        CompressionAlgorithm::Lzma => compress_lzma(data, level),
49    }
50}
51
52/// Decompress data using the specified algorithm.
53pub fn decompress(data: &[u8], algorithm: CompressionAlgorithm) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
54    match algorithm {
55        CompressionAlgorithm::Gzip => decompress_gzip(data),
56        CompressionAlgorithm::Zstd => decompress_zstd(data),
57        CompressionAlgorithm::Brotli => decompress_brotli(data),
58        CompressionAlgorithm::Lz4 => decompress_lz4(data),
59        CompressionAlgorithm::Snappy => decompress_snappy(data),
60        CompressionAlgorithm::Lzma => decompress_lzma(data),
61    }
62}
63
64fn compress_gzip(data: &[u8], level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
65    use flate2::Compression;
66    use flate2::write::GzEncoder;
67    
68    let mut encoder = GzEncoder::new(Vec::new(), Compression::new(level));
69    encoder.write_all(data)?;
70    Ok(encoder.finish()?)
71}
72
73fn decompress_gzip(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
74    use flate2::read::GzDecoder;
75    
76    let mut decoder = GzDecoder::new(data);
77    let mut result = Vec::new();
78    decoder.read_to_end(&mut result)?;
79    Ok(result)
80}
81
82fn compress_zstd(data: &[u8], level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
83    Ok(zstd::encode_all(data, level as i32)?)
84}
85
86fn decompress_zstd(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
87    Ok(zstd::decode_all(data)?)
88}
89
90fn compress_brotli(data: &[u8], level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
91    let mut result = Vec::new();
92    let mut reader = brotli::CompressorReader::new(data, 4096, level, 22);
93    reader.read_to_end(&mut result)?;
94    Ok(result)
95}
96
97fn decompress_brotli(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
98    let mut result = Vec::new();
99    let mut reader = brotli::Decompressor::new(data, 4096);
100    reader.read_to_end(&mut result)?;
101    Ok(result)
102}
103
104fn compress_lz4(data: &[u8], _level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
105    // LZ4 doesn't use compression levels in the same way
106    Ok(lz4::block::compress(data, None, false)?)
107}
108
109fn decompress_lz4(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
110    // We need to know the uncompressed size for LZ4, but we don't have it
111    // Use a reasonable max size (100MB)
112    Ok(lz4::block::decompress(data, Some(100 * 1024 * 1024))?)
113}
114
115fn compress_snappy(data: &[u8], _level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
116    // Snappy doesn't support compression levels
117    let mut encoder = snap::raw::Encoder::new();
118    Ok(encoder.compress_vec(data)?)
119}
120
121fn decompress_snappy(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
122    let mut decoder = snap::raw::Decoder::new();
123    Ok(decoder.decompress_vec(data)?)
124}
125
126fn compress_lzma(data: &[u8], level: u32) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
127    use xz2::write::XzEncoder;
128    
129    let mut encoder = XzEncoder::new(Vec::new(), level);
130    encoder.write_all(data)?;
131    Ok(encoder.finish()?)
132}
133
134fn decompress_lzma(data: &[u8]) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
135    use xz2::read::XzDecoder;
136    
137    let mut decoder = XzDecoder::new(data);
138    let mut result = Vec::new();
139    decoder.read_to_end(&mut result)?;
140    Ok(result)
141}
142
143#[cfg(test)]
144mod tests {
145    use super::*;
146    
147    #[test]
148    fn test_gzip_roundtrip() {
149        let data = b"Hello, world! This is a test of gzip compression.";
150        let compressed = compress(data, CompressionAlgorithm::Gzip, 6).unwrap();
151        let decompressed = decompress(&compressed, CompressionAlgorithm::Gzip).unwrap();
152        assert_eq!(data.as_ref(), decompressed.as_slice());
153    }
154    
155    #[test]
156    fn test_zstd_roundtrip() {
157        let data = b"Hello, world! This is a test of zstd compression.";
158        let compressed = compress(data, CompressionAlgorithm::Zstd, 3).unwrap();
159        let decompressed = decompress(&compressed, CompressionAlgorithm::Zstd).unwrap();
160        assert_eq!(data.as_ref(), decompressed.as_slice());
161    }
162    
163    #[test]
164    fn test_brotli_roundtrip() {
165        let data = b"Hello, world! This is a test of brotli compression.";
166        let compressed = compress(data, CompressionAlgorithm::Brotli, 6).unwrap();
167        let decompressed = decompress(&compressed, CompressionAlgorithm::Brotli).unwrap();
168        assert_eq!(data.as_ref(), decompressed.as_slice());
169    }
170    
171    #[test]
172    fn test_lz4_roundtrip() {
173        let data = b"Hello, world! This is a test of lz4 compression.";
174        let compressed = compress(data, CompressionAlgorithm::Lz4, 0).unwrap();
175        let decompressed = decompress(&compressed, CompressionAlgorithm::Lz4).unwrap();
176        assert_eq!(data.as_ref(), decompressed.as_slice());
177    }
178    
179    #[test]
180    fn test_snappy_roundtrip() {
181        let data = b"Hello, world! This is a test of snappy compression.";
182        let compressed = compress(data, CompressionAlgorithm::Snappy, 0).unwrap();
183        let decompressed = decompress(&compressed, CompressionAlgorithm::Snappy).unwrap();
184        assert_eq!(data.as_ref(), decompressed.as_slice());
185    }
186    
187    #[test]
188    fn test_lzma_roundtrip() {
189        let data = b"Hello, world! This is a test of lzma compression.";
190        let compressed = compress(data, CompressionAlgorithm::Lzma, 6).unwrap();
191        let decompressed = decompress(&compressed, CompressionAlgorithm::Lzma).unwrap();
192        assert_eq!(data.as_ref(), decompressed.as_slice());
193    }
194}
base_d/compression.rs

base_d/
compression.rs
