(Perl) Unzip a Text File Entry into a StringBuilder Using ZipEntry.UnzipToSb

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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.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux

use chilkat();

$success = 0;

$zip = chilkat::CkZip->new();

# Open an existing ZIP archive.
$success = $zip->OpenZip("qa_data/zips/configFiles.zip");
if ($success == 0) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Locate the JSON file entry within the ZIP archive.
$entry = chilkat::CkZipEntry->new();

$success = $zip->EntryOf("config/settings.json",$entry);
if ($success == 0) {
    print "ZIP entry not found." . "\r\n";
    $zip->CloseZip();
    exit;
}

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

# Leave line endings unchanged.
$lineEndingBehavior = 0;

# Interpret the uncompressed bytes as UTF-8 text.
$srcCharset = "utf-8";

$success = $entry->UnzipToSb($lineEndingBehavior,$srcCharset,$sb);
if ($success == 0) {
    print $entry->lastErrorText() . "\r\n";
    exit;
}

print "Uncompressed text:" . "\r\n";
print "" . "\r\n";
print $sb->getAsString() . "\r\n";

$zip->CloseZip();

print "Done." . "\r\n";