(PHP ActiveX) 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 ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Zip')
$zip = new COM("Chilkat.Zip");

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

// Get the entry to be unzipped to a stream..
// entry is a Chilkat.ZipEntry
$entry = $zip->GetEntryByIndex(0);
if ($zip->LastMethodSuccess != 1) {
    print $zip->LastErrorText . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Stream')
$dataStream = new COM("Chilkat.Stream");

// unzipTask is a Chilkat.Task
$unzipTask = $entry->UnzipToStreamAsync($dataStream);
if ($entry->LastMethodSuccess != 1) {
    print $entry->LastErrorText . "\n";

    exit;
}

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

// We'll read the uncompressed data chunk-by-chunk and write to an output file.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.FileAccess')
$fac = new COM("Chilkat.FileAccess");
$success = $fac->OpenForWrite('qa_output/out.dat');
if ($success != 1) {
    print $fac->LastErrorText . "\n";

    exit;
}

// Read the stream.  (this is reading the unzipped file data)
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.BinData')
$bd = new COM("Chilkat.BinData");
while ($dataStream->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.' . "\n";

?>