Node.js

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.

Node.js

NODEJS_PRELUDE

function chilkatExample() {

    var success = false;

    var zip = new chilkat.Zip();

    // Open an existing ZIP archive.
    success = zip.OpenZip("qa_data/zips/configFiles.zip");
    if (success == false) {
        console.log(zip.LastErrorText);
        return;
    }

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

    success = zip.EntryOf("config/settings.json",entry);
    if (success == false) {
        console.log("ZIP entry not found.");
        zip.CloseZip();
        return;
    }

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

    // Leave line endings unchanged.
    var lineEndingBehavior = 0;

    // Interpret the uncompressed bytes as UTF-8 text.
    var srcCharset = "utf-8";

    success = entry.UnzipToSb(lineEndingBehavior,srcCharset,sb);
    if (success == false) {
        console.log(entry.LastErrorText);
        return;
    }

    console.log("Uncompressed text:");
    console.log("");
    console.log(sb.GetAsString());

    zip.CloseZip();

    console.log("Done.");

}

chilkatExample();