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Perl Examples

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(Perl) Streaming Compression

Compress and decompress using a stream.

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

$fac = chilkat::CkFileAccess->new();
$compress = chilkat::CkCompression->new();

$success = $compress->UnlockComponent("Anything for 30-day trial.");
if ($success != 1) {
    print $compress->lastErrorText() . "\r\n";
    exit;
}

$compress->put_Algorithm("deflate");

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

#  This example sets the source and sink of the stream to files.
#  A stream can have use other streams as a source or sink,
#  or the application can itself be the source/sink by directly
#  reading or writing a stream.  (See below for an example of this..)
$streamC->put_SourceFile("qa_data/hamlet.xml");
$streamC->put_SinkFile("qa_output/hamlet_compressed.dat");

#  Compress from source to sink.
$success = $compress->CompressStream($streamC);
if ($success != 1) {
    print $compress->lastErrorText() . "\r\n";
    exit;
}

print "File-to-file deflate compression successful." . "\r\n";
print "Original size = " . $fac->FileSize($streamC->sourceFile()) . "\r\n";
print "Compressed size = " . $fac->FileSize($streamC->sinkFile()) . "\r\n";

#  Now do file-to-file decompression
$streamD = chilkat::CkStream->new();
$streamD->put_SourceFile("qa_output/hamlet_compressed.dat");
$streamD->put_SinkFile("qa_output/hamlet_restored.xml");

#  Decompress from source to sink.
$success = $compress->DecompressStream($streamD);
if ($success != 1) {
    print $compress->lastErrorText() . "\r\n";
    exit;
}

print "File-to-file deflate decompression successful." . "\r\n";

#  Let's double-check to see that the files are equal in size and content:

$bFilesEqual = $fac->FileContentsEqual($streamC->sourceFile(),$streamD->sinkFile());
if ($bFilesEqual != 1) {
    print "The output file is not equal to the input file!" . "\r\n";
}
else {
    print "The file was successfully compressed and decompressed." . "\r\n";
}

#  ---------------------------------------------------------------------
#  Now let's decompress again, but this time w/ the application reading
#  the decompressed data directly from a stream.
$streamA = chilkat::CkStream->new();

$streamA->put_SourceFile("qa_output/hamlet_compressed.dat");

#  Start decompressing in a background thread.
# task is a Task
$task = $compress->DecompressStreamAsync($streamA);
$success = $task->Run();

#  Read decompressed data from streamA:

while (($streamA->get_EndOfStream() != 1)) {
    if ($streamA->get_DataAvailable() == 1) {
        $decompressedText = $streamA->readString();
        print $decompressedText . "\r\n";
    }

}

#  Let's make sure the background task finished and that the decompress was successful.
#  It should already be the case that the task is finished.
while (($task->get_Finished() != 1)) {
    $task->SleepMs(20);
}

#  The decompressor may have finished, but it is possible that data
#  remains to be flushed.
if ($streamA->get_DataAvailable() == 1) {
    $decompressedText = $streamA->readString();
    print $decompressedText . "\r\n";
}

#  Did streamA succeed in reading the entire file?
if ($task->get_TaskSuccess() != 1) {
    print "async decompress failed:" . "\r\n";
    print $task->resultErrorText() . "\r\n";
    $success = 0;
}

print "The async decompress was successful." . "\r\n";

 

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