41 lines
1.3 KiB
Rust
41 lines
1.3 KiB
Rust
//! Write a huge file with lots of zeros, that should compress perfectly.
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use std::io::Write;
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use zip::write::SimpleFileOptions;
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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if !cfg!(feature = "_deflate-any") {
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return Err("Please enable one of the deflate features");
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}
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let args: Vec<_> = std::env::args().collect();
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if args.len() < 2 {
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return Err(format!("Usage: {} <filename>", args[0]).into());
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}
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let filename = &*args[1];
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#![cfg(feature = "_deflate-any")] {
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doit(filename)?;
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}
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Ok(())
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}
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#[cfg(feature = "_deflate-any")]
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fn doit(filename: &str) -> zip::result::ZipResult<()> {
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let file = std::fs::File::create(filename)?;
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let mut zip = zip::ZipWriter::new(file);
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let options = SimpleFileOptions::default()
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.compression_method(zip::CompressionMethod::Deflated)
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// files over u32::MAX require this flag set.
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.large_file(true)
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.unix_permissions(0o755);
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zip.start_file("huge-file-of-zeroes", options)?;
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let content: Vec<_> = std::iter::repeat(0_u8).take(65 * 1024).collect();
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let mut bytes_written = 0_u64;
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while bytes_written < u32::MAX as u64 {
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zip.write_all(&content)?;
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bytes_written += content.len() as u64;
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}
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zip.finish()?;
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Ok(())
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}
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