Fix CRC calculation for addFileFromStream

[sagara-]

This fixes the CRC calculation for data added from streams. It should be calculating the CRC over the uncompressed data, not the compressed data. unzip -t file.zip on linux can be used to verify the integrity of zipped data.

The following short program can can be used to demonstrate the issue. Without this patch, the CRC verification fails because it calculates the CRC over the compressed data instead of the original data.

<?php

require_once 'vendor/autoload.php';

use ZipStream\ZipStream;

$zipPath = '/tmp/file.zip';

$inputFile = fopen('php://memory', 'r+');
fwrite($inputFile, 'testing');
rewind($inputFile);

$fd = fopen($zipPath, 'w');
try {
    $zip = new ZipStream('output.zip', [
        ZipStream::OPTION_OUTPUT_STREAM => $fd,
    ]);

    $zip->addFileFromStream('test.txt', $inputFile);
    $zip->finish();
}
finally {
    fclose($fd);
}

system("unzip -t $zipPath");
unlink($zipPath);

[maennchen]

@sagara- Sorry, I totally missed your PR.

[sagara-]

Don't worry about it, thanks for getting around to it.

[rodush]

@maennchen when are you planning to create a new tag with this fix?

Strange enough, our module which uses this library worked pretty well, until some moment ago, so apparently there was some regression introduced in the development.

[Petah]

I tried running this fix with s3 streams and I still get the same bad CRC error.

[sagara-]

@Petah Can you try using the patch from #67? I had forgotten to submit this patch as well. I'm guessing you're compressing data greater than 1mb.