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<?php
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Avro library top-level file.
*
* This file in turn includes all files supporting the
* Avro implementation.
*
* @package Avro
*/
/**
* General Avro exceptions.
* @package Avro
*/
class AvroException extends Exception {}
/**
* Library-level class for PHP Avro port.
*
* Contains library details such as version number and platform checks.
*
* This port is an implementation of the
* {@link http://avro.apache.org/docs/1.3.3/spec.html Avro 1.3.3 Specification}
*
* @package Avro
*
*/
class Avro
{
/**
* @var string version number of Avro specification to which
* this implemenation complies
*/
const SPEC_VERSION = '1.3.3';
/**#@+
* Constant to enumerate endianness.
* @access private
* @var int
*/
const BIG_ENDIAN = 0x00;
const LITTLE_ENDIAN = 0x01;
/**#@-*/
/**
* Memoized result of self::set_endianness()
* @var int self::BIG_ENDIAN or self::LITTLE_ENDIAN
* @see self::set_endianness()
*/
private static $endianness;
/**#@+
* Constant to enumerate biginteger handling mode.
* GMP is used, if available, on 32-bit platforms.
*/
const PHP_BIGINTEGER_MODE = 0x00;
const GMP_BIGINTEGER_MODE = 0x01;
/**#@-*/
/**
* @var int
* Mode used to handle bigintegers. After Avro::check_64_bit() has been called,
* (usually via a call to Avro::check_platform(), set to
* self::GMP_BIGINTEGER_MODE on 32-bit platforms that have GMP available,
* and to self::PHP_BIGINTEGER_MODE otherwise.
*/
private static $biginteger_mode;
/**
* Wrapper method to call each required check.
*
*/
public static function check_platform()
{
self::check_64_bit();
self::check_little_endian();
}
/**
* Determines if the host platform can encode and decode long integer data.
*
* @throws AvroException if the platform cannot handle long integers.
*/
private static function check_64_bit()
{
if (8 != PHP_INT_SIZE)
if (extension_loaded('gmp'))
self::$biginteger_mode = self::GMP_BIGINTEGER_MODE;
else
throw new AvroException('This platform cannot handle a 64-bit operations. '
. 'Please install the GMP PHP extension.');
else
self::$biginteger_mode = self::PHP_BIGINTEGER_MODE;
}
/**
* @returns boolean true if the PHP GMP extension is used and false otherwise.
* @internal Requires Avro::check_64_bit() (exposed via Avro::check_platform())
* to have been called to set Avro::$biginteger_mode.
*/
static function uses_gmp()
{
return (self::GMP_BIGINTEGER_MODE == self::$biginteger_mode);
}
/**
* Determines if the host platform is little endian,
* required for processing double and float data.
*
* @throws AvroException if the platform is not little endian.
*/
private static function check_little_endian()
{
if (!self::is_little_endian_platform())
throw new AvroException('This is not a little-endian platform');
}
/**
* Determines the endianness of the host platform and memoizes
* the result to Avro::$endianness.
*
* Based on a similar check perfomed in http://pear.php.net/package/Math_BinaryUtils
*
* @throws AvroException if the endianness cannot be determined.
*/
private static function set_endianness()
{
$packed = pack('d', 1);
switch ($packed)
{
case "\77\360\0\0\0\0\0\0":
self::$endianness = self::BIG_ENDIAN;
break;
case "\0\0\0\0\0\0\360\77":
self::$endianness = self::LITTLE_ENDIAN;
break;
default:
throw new AvroException(
sprintf('Error determining platform endianness: %s',
AvroDebug::hex_string($packed)));
}
}
/**
* @returns boolean true if the host platform is big endian
* and false otherwise.
* @uses self::set_endianness()
*/
private static function is_big_endian_platform()
{
if (is_null(self::$endianness))
self::set_endianness();
return (self::BIG_ENDIAN == self::$endianness);
}
/**
* @returns boolean true if the host platform is little endian,
* and false otherwise.
* @uses self::is_bin_endian_platform()
*/
private static function is_little_endian_platform()
{
return !self::is_big_endian_platform();
}
}
require_once('avro/util.php');
require_once('avro/debug.php');
require_once('avro/schema.php');
require_once('avro/io.php');
require_once('avro/gmp.php');
require_once('avro/datum.php');
require_once('avro/data_file.php');
require_once('avro/protocol.php');
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