(PHP Extension) 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.

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<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$zip = new CkZip();

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

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

$dataStream = new CkStream();

// unzipTask is a CkTask
$unzipTask = $entry->UnzipToStreamAsync($dataStream);
if ($entry->get_LastMethodSuccess() != true) {
    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.
$fac = new CkFileAccess();
$success = $fac->OpenForWrite('qa_output/out.dat');
if ($success != true) {
    print $fac->lastErrorText() . "\n";

    exit;
}

// Read the stream.  (this is reading the unzipped file data)
$bd = new CkBinData();
while ($dataStream->get_EndOfStream() != true) {
    // 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";

?>