Metadata::readHeaderVersion() - Code Metrics - Inspection of "Cleaned up" - GravityMedia/Metadata - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — id3-metadata-objects ( ecc500...384c4c )

by Daniel

created 2016-05-10 21:17 UTC

Metadata::readHeaderVersion() A

↳ Parent: Metadata

Complexity

Conditions	4
Paths	4

Size

Total Lines	15
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	20

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	15
ccs	0
cts	11
cp	0
rs	9.2
cc	4
eloc	10
nc	4
nop	0
crap	20

<?php
/**
 * This file is part of the Metadata package.
 *
 * @author Daniel Schröder <[email protected]>
 */

namespace GravityMedia\Metadata\ID3v2;

use GravityMedia\Metadata\Exception\RuntimeException;
use GravityMedia\Stream\Stream;

/**
 * ID3v2 metadata class.
 *
 * @package GravityMedia\Metadata\ID3v2
 */
class Metadata
{
    /**
     * @var Stream
     */
    protected $stream;

    /**
     * Create ID3v2 metadata object.
     *
     * @param Stream $stream
     */
    public function __construct(Stream $stream)
    {
        $this->stream = $stream;
    }

    /**
     * Read synchsafe unsigned 32-bit integer (long) data from the stream.
     *
     * @return int
     */
    public function readSynchsafeUInt32()
    {
        $value = $this->stream->readUInt32();

        return ($value & 0x7f) | ($value & 0x7f00) >> 1 | ($value & 0x7f0000) >> 2 | ($value & 0x7f000000) >> 3;
    }

    /**
     * Returns whether ID3v2 metadata exists.
     *
     * @return bool
     */
    public function exists()

    {
        if ($this->stream->getSize() < 10) {
            return false;
        }

        $this->stream->seek(0);

        return 'ID3' === $this->stream->read(3);
    }

    /**
     * Strip ID3v2 metadata.
     *
     * @return $this
     */
    public function strip()
    {
        // TODO: implement

        return $this;
    }

    /**
     * Read ID3v2 header version.
     *
     * @throws RuntimeException An exception is thrown on invalid versions.
     *
     * @return int
     */
    protected function readHeaderVersion()
    {
        $this->stream->seek(3);

        switch ($this->stream->readUInt8()) {
            case 2:
                return Version::VERSION_22;
            case 3:
                return Version::VERSION_23;
            case 4:
                return Version::VERSION_24;
        }

        throw new RuntimeException('Invalid version.');
    }

    /**
     * Read ID3v2 header revision.
     *
     * @return int
     */
    protected function readHeaderRevision()
    {
        $this->stream->seek(4);

        return $this->stream->readUInt8();
    }

    /**
     * Read ID3v2 header flags.
     *
     * @param int $version
     *
     * @return array
     */
    protected function readHeaderFlags($version)
    {
        $this->stream->seek(5);

        $flags = $this->stream->readUInt8();

        if ($version === Version::VERSION_22) {

            return [
                HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
                HeaderFlag::FLAG_COMPRESSION => (bool)($flags & 0x40)
            ];
        }

        if ($version === Version::VERSION_23) {

            return [
                HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
                HeaderFlag::FLAG_EXTENDED_HEADER => (bool)($flags & 0x40),
                HeaderFlag::FLAG_EXPERIMENTAL_INDICATOR => (bool)($flags & 0x20)
            ];
        }

        return [
            HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
            HeaderFlag::FLAG_EXTENDED_HEADER => (bool)($flags & 0x40),
            HeaderFlag::FLAG_EXPERIMENTAL_INDICATOR => (bool)($flags & 0x20),
            HeaderFlag::FLAG_FOOTER_PRESENT => (bool)($flags & 0x10)
        ];
    }

    /**
     * Read ID3v2 header size.
     *
     * @return int
     */
    public function readHeaderSize()
    {
        $this->stream->seek(6);

        return $this->readSynchsafeUInt32();
    }

    /**
     * Read data.
     *
     * @param Header $header
     *
     * @return string
     */
    protected function readData(Header $header)
    {
        $this->stream->seek(10);
        $data = $this->stream->read($header->getSize());

        if ($header->isFlagEnabled(HeaderFlag::FLAG_COMPRESSION)) {
            $data = gzuncompress($data);
        }

        if ($header->isFlagEnabled(HeaderFlag::FLAG_UNSYNCHRONISATION)) {
            $data = Unsynchronisation::decode($data);
        }

        return $data;
    }

    /**
     * Create data stream.
     *
     * @param string $data
     *
     * @return Stream
     */
    protected function createDataStream($data)
    {
        $resource = fopen('php://temp', 'r+b');
        $stream = Stream::fromResource($resource);
        $stream->write($data);
        $stream->rewind();

        return $stream;
    }

    /**
     * Read ID3v2 tag.
     *
     * @return null|Tag
     */
    public function read()
    {
        if (!$this->exists()) {
            return null;
        }

        $version = $this->readHeaderVersion();

        $header = new Header($version);
        $header->setRevision($this->readHeaderRevision());
        $header->setFlags($this->readHeaderFlags($version));
        $header->setSize($this->readHeaderSize());

        $data = $this->readData($header);
        $stream = $this->createDataStream($data);

        $tagReader = new TagReader($stream, $header);
        $tag = new Tag($header);
        $size = $stream->getSize();

        if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) {
            $extendedHeader = $tagReader->readExtendedHeader();
            $tag->setExtendedHeader($extendedHeader);

            $size -= $extendedHeader->getSize();
        }

        if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) {
            // TODO: Read footer from stream

            $size -= 10;
        }

        while ($size > 0) {
            $frame = $tagReader->readFrame();
            if (0 === $frame->getSize()) {
                break;
            }

            $tag->addFrame($frame);

            $size -= $frame->getSize();
        }

        return $tag;
    }

    /**
     * Write ID3v2 tag.
     *
     * @param Tag $tag The tag to write.
     *
     * @return $this
     */
    public function write(Tag $tag)

    {
        // TODO: implement

        return $this;
    }
}


1		<?php
2		/**
3		* This file is part of the Metadata package.
4		*
5		* @author Daniel Schröder <[email protected]>
6		*/
7
8		namespace GravityMedia\Metadata\ID3v2;
9
10		use GravityMedia\Metadata\Exception\RuntimeException;
11		use GravityMedia\Stream\Stream;
12
13		/**
14		* ID3v2 metadata class.
15		*
16		* @package GravityMedia\Metadata\ID3v2
17		*/
18		class Metadata
19		{
20		/**
21		* @var Stream
22		*/
23		protected $stream;
24
25		/**
26		* Create ID3v2 metadata object.
27		*
28		* @param Stream $stream
29		*/
30		public function __construct(Stream $stream)
31		{
32		$this->stream = $stream;
33		}
34
35		/**
36		* Read synchsafe unsigned 32-bit integer (long) data from the stream.
37		*
38		* @return int
39		*/
40		public function readSynchsafeUInt32()
41		{
42		$value = $this->stream->readUInt32();
43
44		return ($value & 0x7f) \| ($value & 0x7f00) >> 1 \| ($value & 0x7f0000) >> 2 \| ($value & 0x7f000000) >> 3;
45		}
46
47		/**
48		* Returns whether ID3v2 metadata exists.
49		*
50		* @return bool
51		*/
52	View Code Duplication	public function exists()
		0 ignored issues – show Duplication introduced 2016-03-21 17:10 UTC by Report Bug Copy Issue Report This method seems to be duplicated in your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
53		{
54		if ($this->stream->getSize() < 10) {
55		return false;
56		}
57
58		$this->stream->seek(0);
59
60		return 'ID3' === $this->stream->read(3);
61		}
62
63		/**
64		* Strip ID3v2 metadata.
65		*
66		* @return $this
67		*/
68		public function strip()
69		{
70		// TODO: implement
71
72		return $this;
73		}
74
75		/**
76		* Read ID3v2 header version.
77		*
78		* @throws RuntimeException An exception is thrown on invalid versions.
79		*
80		* @return int
81		*/
82		protected function readHeaderVersion()
83		{
84		$this->stream->seek(3);
85
86		switch ($this->stream->readUInt8()) {
87		case 2:
88		return Version::VERSION_22;
89		case 3:
90		return Version::VERSION_23;
91		case 4:
92		return Version::VERSION_24;
93		}
94
95		throw new RuntimeException('Invalid version.');
96		}
97
98		/**
99		* Read ID3v2 header revision.
100		*
101		* @return int
102		*/
103		protected function readHeaderRevision()
104		{
105		$this->stream->seek(4);
106
107		return $this->stream->readUInt8();
108		}
109
110		/**
111		* Read ID3v2 header flags.
112		*
113		* @param int $version
114		*
115		* @return array
116		*/
117		protected function readHeaderFlags($version)
118		{
119		$this->stream->seek(5);
120
121		$flags = $this->stream->readUInt8();
122
123	View Code Duplication	if ($version === Version::VERSION_22) {
		0 ignored issues – show Duplication introduced 2016-05-10 21:21 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
124		return [
125		HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
126		HeaderFlag::FLAG_COMPRESSION => (bool)($flags & 0x40)
127		];
128		}
129
130	View Code Duplication	if ($version === Version::VERSION_23) {
		0 ignored issues – show Duplication introduced 2016-05-10 21:21 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
131		return [
132		HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
133		HeaderFlag::FLAG_EXTENDED_HEADER => (bool)($flags & 0x40),
134		HeaderFlag::FLAG_EXPERIMENTAL_INDICATOR => (bool)($flags & 0x20)
135		];
136		}
137
138		return [
139		HeaderFlag::FLAG_UNSYNCHRONISATION => (bool)($flags & 0x80),
140		HeaderFlag::FLAG_EXTENDED_HEADER => (bool)($flags & 0x40),
141		HeaderFlag::FLAG_EXPERIMENTAL_INDICATOR => (bool)($flags & 0x20),
142		HeaderFlag::FLAG_FOOTER_PRESENT => (bool)($flags & 0x10)
143		];
144		}
145
146		/**
147		* Read ID3v2 header size.
148		*
149		* @return int
150		*/
151		public function readHeaderSize()
152		{
153		$this->stream->seek(6);
154
155		return $this->readSynchsafeUInt32();
156		}
157
158		/**
159		* Read data.
160		*
161		* @param Header $header
162		*
163		* @return string
164		*/
165		protected function readData(Header $header)
166		{
167		$this->stream->seek(10);
168		$data = $this->stream->read($header->getSize());
169
170		if ($header->isFlagEnabled(HeaderFlag::FLAG_COMPRESSION)) {
171		$data = gzuncompress($data);
172		}
173
174		if ($header->isFlagEnabled(HeaderFlag::FLAG_UNSYNCHRONISATION)) {
175		$data = Unsynchronisation::decode($data);
176		}
177
178		return $data;
179		}
180
181		/**
182		* Create data stream.
183		*
184		* @param string $data
185		*
186		* @return Stream
187		*/
188		protected function createDataStream($data)
189		{
190		$resource = fopen('php://temp', 'r+b');
191		$stream = Stream::fromResource($resource);
192		$stream->write($data);
193		$stream->rewind();
194
195		return $stream;
196		}
197
198		/**
199		* Read ID3v2 tag.
200		*
201		* @return null\|Tag
202		*/
203		public function read()
204		{
205		if (!$this->exists()) {
206		return null;
207		}
208
209		$version = $this->readHeaderVersion();
210
211		$header = new Header($version);
212		$header->setRevision($this->readHeaderRevision());
213		$header->setFlags($this->readHeaderFlags($version));
214		$header->setSize($this->readHeaderSize());
215
216		$data = $this->readData($header);
217		$stream = $this->createDataStream($data);
218
219		$tagReader = new TagReader($stream, $header);
220		$tag = new Tag($header);
221		$size = $stream->getSize();
222
223		if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) {
224		$extendedHeader = $tagReader->readExtendedHeader();
225		$tag->setExtendedHeader($extendedHeader);
226
227		$size -= $extendedHeader->getSize();
228		}
229
230		if ($header->isFlagEnabled(HeaderFlag::FLAG_EXTENDED_HEADER)) {
231		// TODO: Read footer from stream
232
233		$size -= 10;
234		}
235
236		while ($size > 0) {
237		$frame = $tagReader->readFrame();
238		if (0 === $frame->getSize()) {
239		break;
240		}
241
242		$tag->addFrame($frame);
243
244		$size -= $frame->getSize();
245		}
246
247		return $tag;
248		}
249
250		/**
251		* Write ID3v2 tag.
252		*
253		* @param Tag $tag The tag to write.
254		*
255		* @return $this
256		*/
257		public function write(Tag $tag)
		0 ignored issues – show Unused Code introduced 2016-05-10 21:21 UTC by Report Bug Copy Issue Report The parameter `$tag` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
258		{
259		// TODO: implement
260
261		return $this;
262		}
263		}
264

GravityMedia / Metadata

Push — id3-metadata-objects ( ecc500...384c4c )

Metadata::readHeaderVersion() A

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