<?php	// $Format:SambaDAV: commit %h @ %cd$

# Copyright (C) 2013, 2014 Bokxing IT, http://www.bokxing-it.nl
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Project page: <https://github.com/1afa/sambadav/>

namespace SambaDAV;

class MD5Filter extends \php_user_filter
{
	private $ctx;

	public function
	onCreate ()
	{
		$this->ctx = hash_init('md5');
		return true;
	}

	public function
	onClose ()
	{
		// $this->params points to an instance of MD5FilterOutput,
		// owned by caller, that caller will use to read out the hash:
		$this->params->hash = hash_final($this->ctx);
		return true;
	}

	public function
	filter ($in, $out, &$consumed, $closing)
	{
		while ($bucket = stream_bucket_make_writeable($in)) {
			hash_update($this->ctx, $bucket->data);
			$consumed += $bucket->datalen;
			stream_bucket_append($out, $bucket);
		}
		return PSFS_PASS_ON;
	}
}