(Perl) Unzip Binary File to Stream

Demonstrates how to unzip a large binary file to a stream to allow the application to process the uncompressed bytes chunk by chunk.

Note: This example requires Chilkat v9.5.0.67 or greater.

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

use chilkat();

# This requires the Chilkat Zip API to have been previously unlocked.
# See Unlock Chilkat Zip for sample code.

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

# First open a .zip.
$success = $zip->OpenZip("qa_data/zips/big.zip");
if ($success != 1) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

# Get the entry to be unzipped to a stream..
# entry is a ZipEntry
$entry = $zip->GetEntryByIndex(0);
if ($zip->get_LastMethodSuccess() != 1) {
    print $zip->lastErrorText() . "\r\n";
    exit;
}

$dataStream = chilkat::CkStream->new();

# unzipTask is a Task
$unzipTask = $entry->UnzipToStreamAsync($dataStream);
if ($entry->get_LastMethodSuccess() != 1) {
    print $entry->lastErrorText() . "\r\n";

    exit;
}

# Start the background unzip thread.
$unzipTask->Run();

# We'll read the uncompressed data chunk-by-chunk and write to an output file.
$fac = chilkat::CkFileAccess->new();
$success = $fac->OpenForWrite("qa_output/out.dat");
if ($success != 1) {
    print $fac->lastErrorText() . "\r\n";

    exit;
}

# Read the stream.  (this is reading the unzipped file data)
$bd = chilkat::CkBinData->new();
while ($dataStream->get_EndOfStream() != 1) {
    # Get the next chunk of decompressed bytes.
    $dataStream->ReadBd($bd);
    # Do something with it..
    # In this simple example, we'll just write to the file.
    $fac->FileWriteBd($bd,0,0);
    # Clear for the next read.
    $bd->Clear();
}

$fac->FileClose();

print "Success." . "\r\n";