Rust

Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

See more Zip Examples

This example demonstrates how to use the ZipEntry.UnzipToSb method to inflate a text file entry directly into a StringBuilder object.

The ZIP entry is uncompressed entirely in memory and appended to the StringBuilder without creating a temporary file on disk.

This is useful when:

• Processing text files directly in memory
• Avoiding temporary filesystem files
• Reading configuration files, JSON, XML, CSV, or source code from ZIP archives
• Automatically converting line endings while inflating the text

The srcCharset argument specifies how the uncompressed bytes should be interpreted, such as:

• utf-8
• utf-16
• windows-1252

The lineEndingBehavior argument controls line-ending conversion:

• 0 — Leave line endings unchanged
• 1 — Convert all line endings to bare LF
• 2 — Convert all line endings to CRLF

Suppose the ZIP archive contains:

config/settings.json

The example inflates the JSON file directly into a StringBuilder.

Rust

let zip = chilkat::Zip::new();

// Open an existing ZIP archive.
if zip.open_zip("qa_data/zips/configFiles.zip").is_err() {
    println!("{}", zip.last_error_text());
    return;
}

// Locate the JSON file entry within the ZIP archive.
let entry = chilkat::ZipEntry::new();

if zip.entry_of("config/settings.json", &entry).is_err() {
    println!("ZIP entry not found.");
    zip.close_zip();
    return;
}

// ------------------------------------------------------------
// Inflate the ZIP entry directly into a StringBuilder.
// 
// The uncompressed text is appended to the StringBuilder.
// 
let sb = chilkat::StringBuilder::new();

// Leave line endings unchanged.
let line_ending_behavior = 0;

// Interpret the uncompressed bytes as UTF-8 text.
let src_charset = "utf-8".to_string();

if entry.unzip_to_sb(line_ending_behavior, &src_charset, &sb).is_err() {
    println!("{}", entry.last_error_text());
    return;
}

println!("Uncompressed text:");
println!("");
println!("{}", sb.get_as_string().unwrap_or_default());

zip.close_zip();

println!("Done.");