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<?php
class Swift_Encoder_Base64EncoderTest extends \PHPUnit\Framework\TestCase
{
private $encoder;
protected function setUp()
{
$this->encoder = new Swift_Encoder_Base64Encoder();
}
/*
There's really no point in testing the entire base64 encoding to the
level QP encoding has been tested. base64_encode() has been in PHP for
years.
*/
public function testInputOutputRatioIs3to4Bytes()
{
/*
RFC 2045, 6.8
The encoding process represents 24-bit groups of input bits as output
strings of 4 encoded characters. Proceeding from left to right, a
24-bit input group is formed by concatenating 3 8bit input groups.
These 24 bits are then treated as 4 concatenated 6-bit groups, each
of which is translated into a single digit in the base64 alphabet.
*/
$this->assertEquals(
'MTIz', $this->encoder->encodeString('123'),
'%s: 3 bytes of input should yield 4 bytes of output'
);
$this->assertEquals(
'MTIzNDU2', $this->encoder->encodeString('123456'),
'%s: 6 bytes in input should yield 8 bytes of output'
);
$this->assertEquals(
'MTIzNDU2Nzg5', $this->encoder->encodeString('123456789'),
'%s: 9 bytes in input should yield 12 bytes of output'
);
}
public function testPadLength()
{
/*
RFC 2045, 6.8
Special processing is performed if fewer than 24 bits are available
at the end of the data being encoded. A full encoding quantum is
always completed at the end of a body. When fewer than 24 input bits
are available in an input group, zero bits are added (on the right)
to form an integral number of 6-bit groups. Padding at the end of
the data is performed using the "=" character. Since all base64
input is an integral number of octets, only the following cases can
arise: (1) the final quantum of encoding input is an integral
multiple of 24 bits; here, the final unit of encoded output will be
an integral multiple of 4 characters with no "=" padding, (2) the
final quantum of encoding input is exactly 8 bits; here, the final
unit of encoded output will be two characters followed by two "="
padding characters, or (3) the final quantum of encoding input is
exactly 16 bits; here, the final unit of encoded output will be three
characters followed by one "=" padding character.
*/
for ($i = 0; $i < 30; ++$i) {
$input = pack('C', random_int(0, 255));
$this->assertRegExp(
'~^[a-zA-Z0-9/\+]{2}==$~', $this->encoder->encodeString($input),
'%s: A single byte should have 2 bytes of padding'
);
}
for ($i = 0; $i < 30; ++$i) {
$input = pack('C*', random_int(0, 255), random_int(0, 255));
$this->assertRegExp(
'~^[a-zA-Z0-9/\+]{3}=$~', $this->encoder->encodeString($input),
'%s: Two bytes should have 1 byte of padding'
);
}
for ($i = 0; $i < 30; ++$i) {
$input = pack('C*', random_int(0, 255), random_int(0, 255), random_int(0, 255));
$this->assertRegExp(
'~^[a-zA-Z0-9/\+]{4}$~', $this->encoder->encodeString($input),
'%s: Three bytes should have no padding'
);
}
}
public function testMaximumLineLengthIs76Characters()
{
/*
The encoded output stream must be represented in lines of no more
than 76 characters each. All line breaks or other characters not
found in Table 1 must be ignored by decoding software.
*/
$input =
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$output =
'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQk'.//38
'NERUZHSElKS0xNTk9QUVJTVFVWV1hZWjEyMzQ1'."\r\n".//76 *
'Njc4OTBhYmNkZWZnaGlqa2xtbm9wcXJzdHV2d3'.//38
'h5ekFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFla'."\r\n".//76 *
'MTIzNDU2Nzg5MEFCQ0RFRkdISUpLTE1OT1BRUl'.//38
'NUVVZXWFla'; //48
$this->assertEquals(
$output, $this->encoder->encodeString($input),
'%s: Lines should be no more than 76 characters'
);
}
public function testMaximumLineLengthCanBeSpecified()
{
$input =
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$output =
'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQk'.//38
'NERUZHSElKS0'."\r\n".//50 *
'xNTk9QUVJTVFVWV1hZWjEyMzQ1Njc4OTBhYmNk'.//38
'ZWZnaGlqa2xt'."\r\n".//50 *
'bm9wcXJzdHV2d3h5ekFCQ0RFRkdISUpLTE1OT1'.//38
'BRUlNUVVZXWF'."\r\n".//50 *
'laMTIzNDU2Nzg5MEFCQ0RFRkdISUpLTE1OT1BR'.//38
'UlNUVVZXWFla'; //50 *
$this->assertEquals(
$output, $this->encoder->encodeString($input, 0, 50),
'%s: Lines should be no more than 100 characters'
);
}
public function testFirstLineLengthCanBeDifferent()
{
$input =
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'abcdefghijklmnopqrstuvwxyz'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.
'1234567890'.
'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$output =
'YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXpBQk'.//38
'NERUZHSElKS0xNTk9QU'."\r\n".//57 *
'VJTVFVWV1hZWjEyMzQ1Njc4OTBhYmNkZWZnaGl'.//38
'qa2xtbm9wcXJzdHV2d3h5ekFCQ0RFRkdISUpLT'."\r\n".//76 *
'E1OT1BRUlNUVVZXWFlaMTIzNDU2Nzg5MEFCQ0R'.//38
'FRkdISUpLTE1OT1BRUlNUVVZXWFla'; //67
$this->assertEquals(
$output, $this->encoder->encodeString($input, 19),
'%s: First line offset is 19 so first line should be 57 chars long'
);
}
}