188 lines
7.4 KiB
PHP
188 lines
7.4 KiB
PHP
<?php
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/**
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* Copyright 2019 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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use PHPUnit\Framework\TestCase;
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use Google\CRC32\CRC32;
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class CRCIterator implements Iterator
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{
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protected $crcs = [
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'Google\CRC32\PHP',
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'Google\CRC32\PHPSlicedBy4',
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'Google\CRC32\Builtin',
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'Google\CRC32\Google',
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];
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protected $algos = [
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CRC32::IEEE,
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CRC32::CASTAGNOLI
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];
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protected $count = 0;
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public function rewind()
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{
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reset($this->crcs);
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reset($this->algos);
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}
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public function valid()
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{
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return current($this->crcs) !== false &&
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current($this->algos) !== false;
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}
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public function key()
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{
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return $this->count;
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}
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public function current()
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{
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return [current($this->crcs), current($this->algos)];
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}
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public function next()
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{
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$this->count++;
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if (next($this->algos) === false) {
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reset($this->algos);
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next($this->crcs);
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}
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// Skip unsupported polynomials
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if ($this->valid()) {
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$crc_class = current($this->crcs);
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$poly = current($this->algos);
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if (!$crc_class::supports($poly)) {
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$this->next();
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}
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}
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}
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}
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class DataIterator implements Iterator
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{
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protected $crcs = [
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'Google\CRC32\PHP',
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'Google\CRC32\PHPSlicedBy4',
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'Google\CRC32\Builtin',
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'Google\CRC32\Google',
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];
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protected $algos = [
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CRC32::IEEE,
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CRC32::CASTAGNOLI
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];
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/**
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* Various test data, taken from:
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* * https://github.com/php/php-src/blob/master/ext/hash/tests/crc32.phpt
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* * https://golang.org/src/hash/crc32/crc32_test.go
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* * https://tools.ietf.org/html/rfc3720#appendix-B.4
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*
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* @var array Hashes for CRC32::IEEE and CRC32::CASTAGNOLI
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*/
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protected $data = [
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'' => array('00000000', '00000000'),
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'a' => array('e8b7be43', 'c1d04330'),
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'ab' => array('9e83486d', 'e2a22936'),
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'abc' => array('352441c2', '364b3fb7'),
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'abcd' => array('ed82cd11', '92c80a31'),
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'abcde' => array('8587d865', 'c450d697'),
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'abcdef' => array('4b8e39ef', '53bceff1'),
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'abcdefg' => array('312a6aa6', 'e627f441'),
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'abcdefgh' => array('aeef2a50', '0a9421b7'),
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'abcdefghi' => array('8da988af', '2ddc99fc'),
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'abcdefghij' => array('3981703a', 'e6599437'),
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'abcdefghijklmnopqrstuvwxyz' => array('4c2750bd', '9ee6ef25'),
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789' => array('1fc2e6d2', 'a245d57d'),
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'12345678901234567890123456789012345678901234567890123456789012345678901234567890' => array('7ca94a72', '477a6781'),
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'message digest' => array('20159d7f', '02bd79d0'),
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"I can't remember anything" => array('69147a4e', '5e405e93'),
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"I can't remember anythingCan’t tell if this is true or dream" => array('3ee63999', '516ad412'),
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'Discard medicine more than two years old.' => array('6b9cdfe7', 'b2cc01fe'),
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'He who has a shady past knows that nice guys finish last.' => array('c90ef73f', '0e28207f'),
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"I wouldn't marry him with a ten foot pole." => array('b902341f', 'be93f964'),
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"Free! Free!/A trip/to Mars/for 900/empty jars/Burma Shave" => array('042080e8', '9e3be0c3'),
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"The days of the digital watch are numbered. -Tom Stoppard" => array('154c6d11', 'f505ef04'),
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"Nepal premier won't resign." => array('4c418325', '85d3dc82'),
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"For every action there is an equal and opposite government program." => array('33955150', 'c5142380'),
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"His money is twice tainted: 'taint yours and 'taint mine." => array('26216a4b', '75eb77dd'),
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"There is no reason for any individual to have a computer in their home. -Ken Olsen, 1977" => array('1abbe45e', '91ebe9f7'),
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"It's a tiny change to the code and not completely disgusting. - Bob Manchek" => array('c89a94f7', 'f0b1168e'),
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"size: a.out: bad magic" => array('ab3abe14', '572b74e2'),
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"The major problem is with sendmail. -Mark Horton" => array('bab102b6', '8a58a6d5'),
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"Give me a rock, paper and scissors and I will move the world. CCFestoon" => array('999149d7', '9c426c50'),
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"If the enemy is within range, then so are you." => array('6d52a33c', '735400a4'),
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"It's well we cannot hear the screams/That we create in others' dreams." => array('90631e8d', 'bec49c95'),
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"You remind me of a TV show, but that's all right: I watch it anyway." => array('78309130', 'a95a2079'),
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"C is as portable as Stonehedge!!" => array('7d0a377f', 'de2e65c5'),
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"Even if I could be Shakespeare, I think I should still choose to be Faraday. - A. Huxley" => array('8c79fd79', '297a88ed'),
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"The fugacity of a constituent in a mixture of gases at a given temperature is proportional to its mole fraction. Lewis-Randall Rule" => array('a20b7167', '66ed1d8b'),
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"How can you write a big system without C++? -Paul Glick" => array('8e0bb443', 'dcded527'),
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"\x00\x01\x02\x03\x04\x05\x06\x07\x08\t\n\v\f\r\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f !\"#\$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff" => array('29058c73', '9c44184b')
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];
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protected $count = 0;
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public function rewind()
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{
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reset($this->crcs);
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reset($this->algos);
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reset($this->data);
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}
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public function valid()
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{
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return current($this->crcs) !== false &&
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current($this->algos) !== false &&
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current($this->data) !== false;
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}
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public function key()
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{
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return $this->count;
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}
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public function current()
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{
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return [current($this->crcs), current($this->algos), key($this->data), current($this->data)[key($this->algos)]];
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}
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public function next()
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{
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$this->count++;
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if (next($this->data) === false) {
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reset($this->data);
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if (next($this->algos) === false) {
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reset($this->algos);
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next($this->crcs);
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}
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}
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// Skip unsupported polynomials
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if ($this->valid()) {
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$crc_class = current($this->crcs);
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$poly = current($this->algos);
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if (!$crc_class::supports($poly)) {
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$this->next();
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}
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}
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}
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}
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