xp-forge / compression
Compression I/O for the XP Framework
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Requires
- php: >=7.0.0
- xp-framework/core: ^12.0 | ^11.0 | ^10.0
Requires (Dev)
- xp-framework/test: ^2.0 | ^1.0
README
Compressing output and decompressing input streams including GZip, BZip2 and Brotli.
Examples
Reading a GZIP-compressed file:
use io\streams\FileInputStream; use io\streams\compress\GzipInputStream; $in= new GzipInputStream(new FileInputStream('message.txt.gz')); while ($in->available()) { echo $in->read(); } $in->close();
Writing a file, compressing the data on-the-fly with BZIP2:
use io\streams\FileOutputStream; use io\streams\compress\Bzip2OutputStream; $out= new Bzip2OutputStream(new FileOutputStream('message.txt.bz2')); $out->write('Hello World!'); $out->write("\n"); $out->close();
Dependencies
Compression algorithms are implemented in C and thus require a specific PHP extension:
- GZip - requires PHP's "zlib" extension
- Bzip2 - requires PHP's "bzip2" extension
- Brotli - requires https://github.com/kjdev/php-ext-brotli
Accessing these algorithms can be done via the Compression
API:
use io\streams\{Compression, FileInputStream, FileOutputStream}; // Returns an algorithm instance. Raises a lang.MethodNotImplementedException // if the required "bzip2" extension is not loaded $compressed= Compression::named('bzip2'); // Read $bytes= ''; $in= $compressed->open(new FileInputStream($file)); while ($in->available()) { $bytes.= $in->read(); } $in->close(); // Write using strongest compression (other predefined values are FASTEST // and DEFAULT; alternatively, the level can be passed directly). $out= $compressed->create(new FileOutputStream($file), Compression::STRONGEST); $out->write($bytes); $out->close();
Discovering supported algorithms can be done using the Compression
API:
use io\streams\Compression; echo "Supported algorithms:\n"; foreach (Compression::algorithms()->supported() as $compression) { echo '✓ ', $compression->name(), "\n"; }
...or as a one-line shell command:
$ xp -w '\io\streams\Compression::algorithms()'
io.streams.compress.Algorithms@{
io.streams.compress.Gzip(token: gzip, extension: .gz, supported: true, levels: 1..9)
io.streams.compress.Bzip2(token: bzip2, extension: .bz2, supported: false, levels: 1..9)
io.streams.compress.Brotli(token: br, extension: .br, supported: true, levels: 1..11)
}
Advanced example
Fetching a given URL using HTTP Accept-Encoding and Content-Encoding:
use io\streams\Compression; use peer\http\HttpConnection; // Compile list of supported compression algorithms, e.g. "gzip, br" $accept= Compression::algorithms()->accept(); echo "== Sending {$accept} ==\n"; // Make request, sending supported content encodings via Accept-Encoding $conn= new HttpConnection($argv[1]); $res= $conn->get(null, ['Accept-Encoding' => $accept]); // Handle Content-Encoding header if ($encoding= $res->header('Content-Encoding')) { $compression= Compression::named($encoding[0]); echo "== Using ", $compression->name(), " ==\n"; $in= $compression->open($res->in()); } else { echo "== Uncompressed ==\n"; $in= $res->in(); } // Write contents to output while ($in->available()) { echo $in->read(); } $in->close();