Math::parseCompact() - Code Metrics - Inspection of "Merge pull request #318 from afk11/unify-phpecc-ec..." - Bit-Wasp/bitcoin-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 57f238...3923b5 )

by thomas

created 2016-06-17 22:18 UTC

Math::parseCompact() B

↳ Parent: Project

Complexity

Conditions	6
Paths	9

Size

Total Lines	26
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	18
CRAP Score	6

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	26
ccs	18
cts	18
cp	1
rs	8.439
cc	6
eloc	16
nc	9
nop	2
crap	6

<?php

namespace BitWasp\Bitcoin\Math;

use \Mdanter\Ecc\Math\GmpMath;
use Mdanter\Ecc\Util\NumberSize;

class Math extends GmpMath
{

    /**
     * @param $integer
     * @return bool
     */
    public function isEven($integer)
    {
        return $this->cmp($this->mod($integer, gmp_init(2)), gmp_init(0)) === 0;
    }

    /**
     * @param \GMP $int
     * @param \GMP $otherInt
     * @return \GMP
     */
    public function bitwiseOr(\GMP $int, \GMP $otherInt)
    {
        return gmp_or($int, $otherInt);
    }

    /**
     * Similar to gmp_div_qr, return a tuple containing the
     * result and the remainder
     *
     * @param \GMP $dividend
     * @param \GMP $divisor
     * @return array
     */
    public function divQr(\GMP $dividend, \GMP $divisor)
    {
        // $div = n / q
        $div = $this->div($dividend, $divisor);
        // $remainder = n - (n / q) * q
        $remainder = $this->sub($dividend, $this->mul($div, $divisor));
        return array($div, $remainder);
    }

    /**
     * @param int $compact
     * @param bool|false $isNegative
     * @param bool|false $isOverflow
     * @return \GMP
     */
    public function decodeCompact($compact, &$isNegative, &$isOverflow)
    {
        $compact = gmp_init($compact, 10);
        $size = $this->rightShift($compact, 24);
        $word = $this->bitwiseAnd($compact, gmp_init(0x007fffff));
        if ($this->cmp($size, gmp_init(3)) <= 0) {
            $positions = $this->toString($this->mul(gmp_init(8), $this->sub(gmp_init(3), $size)));
            $word = $this->rightShift($word, $positions);
        } else {
            $positions = $this->toString($this->mul(gmp_init(8), $this->sub($size, gmp_init(3))));
            $word = $this->leftShift($word, $positions);

        }

        // isNegative: $word != 0 && $uint32 & 0x00800000 != 0
        // isOverflow: $word != 0 && (($size > 34) || ($word > 0xff && $size > 33) || ($word > 0xffff && $size  >32))
        $zero = gmp_init(0);
        $isNegative = ($this->cmp($word, $zero) !== 0) && ($this->cmp($this->bitwiseAnd($compact, gmp_init(0x00800000)), $zero) === 1);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
        $isOverflow = $this->cmp($word, $zero) !== 0 && (
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
                ($this->cmp($size, gmp_init(34)) > 0)
                || ($this->cmp($word, gmp_init(0xff)) > 0 && $this->cmp($size, gmp_init(33)) > 0)
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
                || ($this->cmp($word, gmp_init(0xffff)) > 0 && $this->cmp($size, gmp_init(32)) > 0)
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
            );

        return $word;
    }

    /**
     * @param \GMP $integer
     * @return \GMP
     */
    public function getLow64(\GMP $integer)
    {
        $bits = gmp_strval($integer, 2);
        $bits = substr($bits, 0, 64);
        $bits = str_pad($bits, 64, '0', STR_PAD_LEFT);
        return gmp_init($bits, 2);
    }

    /**
     * @param \GMP $integer
     * @param bool $fNegative
     * @return \GMP
     */
    public function encodeCompact(\GMP $integer, $fNegative)
    {
        if (!is_bool($fNegative)) {
            throw new \InvalidArgumentException('CompactInteger::read() - flag must be boolean!');
        }

        $size = (int) NumberSize::bnNumBytes($this, $integer);
        if ($size <= 3) {
            $compact = $this->leftShift($this->getLow64($integer), (8 * (3 - $size)));
        } else {
            $compact = $this->rightShift($integer, 8 * ($size - 3));
            $compact = $this->getLow64($compact);
        }

        if ($this->cmp($this->bitwiseAnd($compact, gmp_init(0x00800000, 10)), gmp_init(0)) > 0) {
            $compact = $this->rightShift($compact, 8);
            $size = $size + 1;
        }

        $compact = $this->bitwiseOr($compact, $this->leftShift(gmp_init($size, 10), 24));
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
        if ($fNegative && $this->cmp($this->bitwiseAnd($compact, gmp_init(0x007fffff)), gmp_init(0)) > 0) { /// ?
            $compact = $this->bitwiseOr($compact, gmp_init(0x00800000));
        }

        return $compact;
    }
}


1		<?php
2
3		namespace BitWasp\Bitcoin\Math;
4
5		use \Mdanter\Ecc\Math\GmpMath;
6		use Mdanter\Ecc\Util\NumberSize;
7
8		class Math extends GmpMath
9		{
10
11		/**
12		* @param $integer
13		* @return bool
14		*/
15	131	public function isEven($integer)
16		{
17	131	return $this->cmp($this->mod($integer, gmp_init(2)), gmp_init(0)) === 0;
18		}
19
20		/**
21		* @param \GMP $int
22		* @param \GMP $otherInt
23		* @return \GMP
24		*/
25	186	public function bitwiseOr(\GMP $int, \GMP $otherInt)
26		{
27	186	return gmp_or($int, $otherInt);
28		}
29
30		/**
31		* Similar to gmp_div_qr, return a tuple containing the
32		* result and the remainder
33		*
34		* @param \GMP $dividend
35		* @param \GMP $divisor
36		* @return array
37		*/
38	156	public function divQr(\GMP $dividend, \GMP $divisor)
39		{
40		// $div = n / q
41	156	$div = $this->div($dividend, $divisor);
42		// $remainder = n - (n / q) * q
43	156	$remainder = $this->sub($dividend, $this->mul($div, $divisor));
44	156	return array($div, $remainder);
45		}
46
47		/**
48		* @param int $compact
49		* @param bool\|false $isNegative
50		* @param bool\|false $isOverflow
51		* @return \GMP
52		*/
53	630	public function decodeCompact($compact, &$isNegative, &$isOverflow)
54		{
55	630	$compact = gmp_init($compact, 10);
56	630	$size = $this->rightShift($compact, 24);
57	630	$word = $this->bitwiseAnd($compact, gmp_init(0x007fffff));
58	630	if ($this->cmp($size, gmp_init(3)) <= 0) {
59	39	$positions = $this->toString($this->mul(gmp_init(8), $this->sub(gmp_init(3), $size)));
60	39	$word = $this->rightShift($word, $positions);
61	26	} else {
62	591	$positions = $this->toString($this->mul(gmp_init(8), $this->sub($size, gmp_init(3))));
63	591	$word = $this->leftShift($word, $positions);
		0 ignored issues – show Bug Compatibility introduced 2016-06-17 22:24 UTC by Report Bug Copy Issue Report The expression `$this->leftShift($word, $positions);` of type `resource` adds the type `resource` to the return on line 76 which is incompatible with the return type documented by `BitWasp\Bitcoin\Math\Math::decodeCompact` of type `GMP`. Loading history...
64		}
65
66		// isNegative: $word != 0 && $uint32 & 0x00800000 != 0
67		// isOverflow: $word != 0 && (($size > 34) \|\| ($word > 0xff && $size > 33) \|\| ($word > 0xffff && $size >32))
68	630	$zero = gmp_init(0);
69	630	$isNegative = ($this->cmp($word, $zero) !== 0) && ($this->cmp($this->bitwiseAnd($compact, gmp_init(0x00800000)), $zero) === 1);
		0 ignored issues – show Bug introduced 2016-06-17 14:28 UTC by Report Bug Copy Issue Report It seems like `$word` defined by `$this->leftShift($word, $positions)` on line `63` can also be of type `resource`; however, `Mdanter\Ecc\Math\GmpMath::cmp()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
70	630	$isOverflow = $this->cmp($word, $zero) !== 0 && (
		0 ignored issues – show Bug introduced 2016-06-17 14:28 UTC by Report Bug Copy Issue Report It seems like `$word` defined by `$this->leftShift($word, $positions)` on line `63` can also be of type `resource`; however, `Mdanter\Ecc\Math\GmpMath::cmp()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
71	597	($this->cmp($size, gmp_init(34)) > 0)
72	594	\|\| ($this->cmp($word, gmp_init(0xff)) > 0 && $this->cmp($size, gmp_init(33)) > 0)
		0 ignored issues – show Bug introduced 2016-06-17 14:28 UTC by Report Bug Copy Issue Report It seems like `$word` defined by `$this->leftShift($word, $positions)` on line `63` can also be of type `resource`; however, `Mdanter\Ecc\Math\GmpMath::cmp()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
73	606	\|\| ($this->cmp($word, gmp_init(0xffff)) > 0 && $this->cmp($size, gmp_init(32)) > 0)
		0 ignored issues – show Bug introduced 2016-06-17 14:28 UTC by Report Bug Copy Issue Report It seems like `$word` defined by `$this->leftShift($word, $positions)` on line `63` can also be of type `resource`; however, `Mdanter\Ecc\Math\GmpMath::cmp()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
74	420	);
75
76	630	return $word;
77		}
78
79		/**
80		* @param \GMP $integer
81		* @return \GMP
82		*/
83	54	public function getLow64(\GMP $integer)
84		{
85	54	$bits = gmp_strval($integer, 2);
86	54	$bits = substr($bits, 0, 64);
87	54	$bits = str_pad($bits, 64, '0', STR_PAD_LEFT);
88	54	return gmp_init($bits, 2);
89		}
90
91		/**
92		* @param \GMP $integer
93		* @param bool $fNegative
94		* @return \GMP
95		*/
96	57	public function encodeCompact(\GMP $integer, $fNegative)
97		{
98	57	if (!is_bool($fNegative)) {
99	3	throw new \InvalidArgumentException('CompactInteger::read() - flag must be boolean!');
100		}
101
102	54	$size = (int) NumberSize::bnNumBytes($this, $integer);
103	54	if ($size <= 3) {
104	42	$compact = $this->leftShift($this->getLow64($integer), (8 * (3 - $size)));
105	28	} else {
106	12	$compact = $this->rightShift($integer, 8 * ($size - 3));
107	12	$compact = $this->getLow64($compact);
108		}
109
110	54	if ($this->cmp($this->bitwiseAnd($compact, gmp_init(0x00800000, 10)), gmp_init(0)) > 0) {
111	3	$compact = $this->rightShift($compact, 8);
112	3	$size = $size + 1;
113	2	}
114
115	54	$compact = $this->bitwiseOr($compact, $this->leftShift(gmp_init($size, 10), 24));
		0 ignored issues – show Bug introduced 2016-06-17 14:28 UTC by Report Bug Copy Issue Report It seems like `$compact` defined by `$this->bitwiseOr($compac...p_init($size, 10), 24))` on line `115` can also be of type `resource`; however, `BitWasp\Bitcoin\Math\Math::bitwiseOr()` does only seem to accept `object<GMP>`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
116	54	if ($fNegative && $this->cmp($this->bitwiseAnd($compact, gmp_init(0x007fffff)), gmp_init(0)) > 0) { /// ?
117	6	$compact = $this->bitwiseOr($compact, gmp_init(0x00800000));
118	4	}
119
120	54	return $compact;
121		}
122		}
123

Bit-Wasp / bitcoin-php

Push — master ( 57f238...3923b5 )

Math::parseCompact() B

Complexity

Size

Duplication

Code Coverage

Importance

Duplication Side-by-Side

Filter issues like