Decoder::decode() - Code Metrics - Inspection of "Initial Commit" - aurimasniekis/akatsuki-bencode - Measure and Improve Code Quality continuously with Scrutinizer

Completed

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by Aurimas

created 2017-05-12 12:46 UTC

Decoder::decode() A

↳ Parent: Decoder

Complexity

Conditions	2
Paths	2

Size

Total Lines	14
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	14
ccs	8
cts	8
cp	1
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	8
nc	2
nop	1
crap	2

<?php

namespace Akatsuki\Component\Bencode;

use Akatsuki\Component\Bencode\Exception\InvalidSourceException;

/**
 * Class Decoder
 *
 * @package Akatsuki\Component\Bencode
 * @author  Aurimas Niekis <[email protected]>
 */
class Decoder
{
    /**
     * @var string
     */
    private $source;

    /**
     * @var int
     */
    private $sourceLength;

    /**
     * @var int
     */
    private $offset;

    public function decode(string $source)
    {
        $this->source       = $source;
        $this->sourceLength = strlen($this->source);
        $this->offset       = 0;

        $decoded = $this->doDecode();

        if ($this->offset !== $this->sourceLength) {
            throw new InvalidSourceException('Found multiple entities outside list or dict definitions');
        }

        return $decoded;
    }

    private function doDecode()
    {
        switch ($this->getChar()) {

            case 'i':
                ++$this->offset;

                return $this->decodeInteger();

            case 'l':
                ++$this->offset;

                return $this->decodeList();

            case 'd':
                ++$this->offset;

                return $this->decodeDict();

            default:
                if (ctype_digit($this->getChar())) {
                    return $this->decodeString();
                }

        }

        throw new InvalidSourceException("Unknown entity found at offset $this->offset");
    }

    private function decodeInteger(): int
    {
        $offsetOfE = strpos($this->source, 'e', $this->offset);
        if (false === $offsetOfE) {
            throw new InvalidSourceException("Unterminated integer entity at offset $this->offset");
        }

        $currentOffset = $this->offset;
        if ('-' === $this->getChar($currentOffset)) {
            ++$currentOffset;
        }

        if ($offsetOfE === $currentOffset) {
            throw new InvalidSourceException("Empty integer entity at offset $this->offset");
        }

        while ($currentOffset < $offsetOfE) {
            if (!ctype_digit($this->getChar($currentOffset))) {
                throw new InvalidSourceException(
                    "Non-numeric character found in integer entity at offset $this->offset"
                );
            }
            ++$currentOffset;
        }

        $value = substr($this->source, $this->offset, $offsetOfE - $this->offset);

        $absoluteValue = (string)abs($value);
        if (1 < strlen($absoluteValue) && '0' === $value[0]) {
            throw new InvalidSourceException("Illegal zero-padding found in integer entity at offset $this->offset");
        }

        $this->offset = $offsetOfE + 1;

        return (int)$value + 0;
    }

    private function decodeString(): string
    {
        if ('0' === $this->getChar() && ':' !== $this->getChar($this->offset + 1)) {
            throw new InvalidSourceException(
                "Illegal zero-padding in string entity length declaration at offset $this->offset"
            );
        }

        $offsetOfColon = strpos($this->source, ':', $this->offset);
        if (false === $offsetOfColon) {
            throw new InvalidSourceException("Unterminated string entity at offset $this->offset");
        }

        $contentLength = (int)substr($this->source, $this->offset, $offsetOfColon);
        if (($contentLength + $offsetOfColon + 1) > $this->sourceLength) {
            throw new InvalidSourceException("Unexpected end of string entity at offset $this->offset");
        }

        $value        = substr($this->source, $offsetOfColon + 1, $contentLength);
        $this->offset = $offsetOfColon + $contentLength + 1;

        return $value;
    }

    private function decodeList(): array
    {
        $list       = [];
        $terminated = false;
        $listOffset = $this->offset;

        while (null !== $this->getChar()) {
            if ('e' === $this->getChar()) {
                $terminated = true;
                break;
            }

            $list[] = $this->doDecode();
        }

        if (false === $terminated && null === $this->getChar()) {
            throw new InvalidSourceException("Unterminated list definition at offset $listOffset");
        }

        $this->offset++;

        return $list;
    }

    private function decodeDict(): array
    {
        $dict       = [];
        $terminated = false;
        $dictOffset = $this->offset;

        while (null !== $this->getChar()) {
            if ('e' === $this->getChar()) {
                $terminated = true;
                break;
            }

            $keyOffset = $this->offset;
            if (false === ctype_digit($this->getChar())) {
                throw new InvalidSourceException("Invalid dictionary key at offset $keyOffset");
            }

            $key = $this->decodeString();
            if (isset($dict[$key])) {
                throw new InvalidSourceException("Duplicate dictionary key at offset $keyOffset");
            }

            $dict[$key] = $this->doDecode();
        }

        if (false === $terminated && null === $this->getChar()) {
            throw new InvalidSourceException("Unterminated dictionary definition at offset $dictOffset");
        }

        $this->offset++;

        return $dict;
    }

    private function getChar(int $offset = null): ?string
    {
        if (null === $offset) {
            $offset = $this->offset;
        }

        if (empty($this->source) || $this->offset >= $this->sourceLength) {
            return null;
        }

        return $this->source[$offset];
    }
}

1		<?php
2
3		namespace Akatsuki\Component\Bencode;
4
5		use Akatsuki\Component\Bencode\Exception\InvalidSourceException;
6
7		/**
8		* Class Decoder
9		*
10		* @package Akatsuki\Component\Bencode
11		* @author Aurimas Niekis <[email protected]>
12		*/
13		class Decoder
14		{
15		/**
16		* @var string
17		*/
18		private $source;
19
20		/**
21		* @var int
22		*/
23		private $sourceLength;
24
25		/**
26		* @var int
27		*/
28		private $offset;
29
30	17	public function decode(string $source)
31		{
32	17	$this->source = $source;
33	17	$this->sourceLength = strlen($this->source);
34	17	$this->offset = 0;
35
36	17	$decoded = $this->doDecode();
37
38	5	if ($this->offset !== $this->sourceLength) {
39	1	throw new InvalidSourceException('Found multiple entities outside list or dict definitions');
40		}
41
42	4	return $decoded;
43		}
44
45	17	private function doDecode()
46		{
47	17	switch ($this->getChar()) {
48
49	17	case 'i':
50	5	++$this->offset;
51
52	5	return $this->decodeInteger();
53
54	12	case 'l':
55	2	++$this->offset;
56
57	2	return $this->decodeList();
58
59	12	case 'd':
60	4	++$this->offset;
61
62	4	return $this->decodeDict();
63
64		default:
65	11	if (ctype_digit($this->getChar())) {
66	10	return $this->decodeString();
67		}
68
69		}
70
71	1	throw new InvalidSourceException("Unknown entity found at offset $this->offset");
72		}
73
74	5	private function decodeInteger(): int
75		{
76	5	$offsetOfE = strpos($this->source, 'e', $this->offset);
77	5	if (false === $offsetOfE) {
78	1	throw new InvalidSourceException("Unterminated integer entity at offset $this->offset");
79		}
80
81	4	$currentOffset = $this->offset;
82	4	if ('-' === $this->getChar($currentOffset)) {
83	1	++$currentOffset;
84		}
85
86	4	if ($offsetOfE === $currentOffset) {
87	1	throw new InvalidSourceException("Empty integer entity at offset $this->offset");
88		}
89
90	3	while ($currentOffset < $offsetOfE) {
91	3	if (!ctype_digit($this->getChar($currentOffset))) {
92	1	throw new InvalidSourceException(
93	1	"Non-numeric character found in integer entity at offset $this->offset"
94		);
95		}
96	2	++$currentOffset;
97		}
98
99	2	$value = substr($this->source, $this->offset, $offsetOfE - $this->offset);
100
101	2	$absoluteValue = (string)abs($value);
102	2	if (1 < strlen($absoluteValue) && '0' === $value[0]) {
103	1	throw new InvalidSourceException("Illegal zero-padding found in integer entity at offset $this->offset");
104		}
105
106	1	$this->offset = $offsetOfE + 1;
107
108	1	return (int)$value + 0;
109		}
110
111	10	private function decodeString(): string
112		{
113	10	if ('0' === $this->getChar() && ':' !== $this->getChar($this->offset + 1)) {
114	1	throw new InvalidSourceException(
115	1	"Illegal zero-padding in string entity length declaration at offset $this->offset"
116		);
117		}
118
119	9	$offsetOfColon = strpos($this->source, ':', $this->offset);
120	9	if (false === $offsetOfColon) {
121	1	throw new InvalidSourceException("Unterminated string entity at offset $this->offset");
122		}
123
124	8	$contentLength = (int)substr($this->source, $this->offset, $offsetOfColon);
125	8	if (($contentLength + $offsetOfColon + 1) > $this->sourceLength) {
126	1	throw new InvalidSourceException("Unexpected end of string entity at offset $this->offset");
127		}
128
129	7	$value = substr($this->source, $offsetOfColon + 1, $contentLength);
130	7	$this->offset = $offsetOfColon + $contentLength + 1;
131
132	7	return $value;
133		}
134
135	2	private function decodeList(): array
136		{
137	2	$list = [];
138	2	$terminated = false;
139	2	$listOffset = $this->offset;
140
141	2	while (null !== $this->getChar()) {
142	2	if ('e' === $this->getChar()) {
143	1	$terminated = true;
144	1	break;
145		}
146
147	2	$list[] = $this->doDecode();
148		}
149
150	2	if (false === $terminated && null === $this->getChar()) {
151	1	throw new InvalidSourceException("Unterminated list definition at offset $listOffset");
152		}
153
154	1	$this->offset++;
155
156	1	return $list;
157		}
158
159	4	private function decodeDict(): array
160		{
161	4	$dict = [];
162	4	$terminated = false;
163	4	$dictOffset = $this->offset;
164
165	4	while (null !== $this->getChar()) {
166	4	if ('e' === $this->getChar()) {
167	1	$terminated = true;
168	1	break;
169		}
170
171	4	$keyOffset = $this->offset;
172	4	if (false === ctype_digit($this->getChar())) {
173	1	throw new InvalidSourceException("Invalid dictionary key at offset $keyOffset");
174		}
175
176	3	$key = $this->decodeString();
177	3	if (isset($dict[$key])) {
178	1	throw new InvalidSourceException("Duplicate dictionary key at offset $keyOffset");
179		}
180
181	3	$dict[$key] = $this->doDecode();
182		}
183
184	2	if (false === $terminated && null === $this->getChar()) {
185	1	throw new InvalidSourceException("Unterminated dictionary definition at offset $dictOffset");
186		}
187
188	1	$this->offset++;
189
190	1	return $dict;
191		}
192
193	17	private function getChar(int $offset = null): ?string
194		{
195	17	if (null === $offset) {
196	17	$offset = $this->offset;
197		}
198
199	17	if (empty($this->source) \|\| $this->offset >= $this->sourceLength) {
200	2	return null;
201		}
202
203	17	return $this->source[$offset];
204		}
205		}

aurimasniekis / akatsuki-bencode

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Decoder::decode() A

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