Buffer::readInt16() - Code Metrics - indy2kro/php-iso - Measure and Improve Code Quality continuously with Scrutinizer

Buffer::readInt16() A
last analyzed 2025-05-17 06:32 UTC

↳ Parent: Buffer

Complexity

Conditions	3
Paths	3

Size

Total Lines	17
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	3

Importance

Changes	2
Bugs	1	Features	0

Metric	Value
eloc	9
c	2
b	1
f	0
dl	0
loc	17
ccs	10
cts	10
cp	1
rs	9.9666
cc	3
nc	3
nop	2
crap	3

<?php

declare(strict_types=1);

namespace PhpIso\Util;

use PhpIso\Exception;

class Buffer
{
    /**
     * Align a number
     */
    public static function align(int $num, int $align): int
    {
        $tmp = (int) ($num / $align);
        if ((int) ($num % $align) > 0) {
            $tmp++;
        }

        return $tmp * $align;
    }

    /**
     * Read a string from the buffer
     *
     * @param array<int, int> $buffer
     */
    public static function getString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
    {
        $string = '';
        for ($i = $offset; $i < $offset + $length; $i++) {
            if (! isset($buffer[$i])) {
                throw new Exception('Failed to read buffer entry ' . $i);
            }
            if ($supplementary || $buffer[$i] !== 0) {
                $string .= chr($buffer[$i]);
            }
        }

        if ($supplementary) {
            $string = mb_convert_encoding($string, 'UTF-8', 'UTF-16');

            if ($string === false) {
                throw new Exception('Failed to convert supplementary string');
            }
        }

        $offset += $length;
        return $string;
    }

    /**
     * Read an a-string from the buffer
     *
     * @param array<int, int> $buffer
     */
    public static function readAString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
    {
        return self::getString($buffer, $length, $offset);
    }

    /**
     * Read a d-string from the buffer
     *
     * @param array<int, int> $buffer
     */
    public static function readDString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
    {
        return self::getString($buffer, $length, $offset, $supplementary);
    }

    /**
     * Read datas from the buffer
     *
     * @param array<int, int> $buffer
     */
    public static function getBytes(array &$buffer, int $length, int &$offset = 0): string
    {
        $datas = '';
        for ($i = $offset; $i < $offset + $length; $i++) {
            if (! isset($buffer[$i])) {
                throw new Exception('Failed to read buffer entry ' . $i);
            }
            $datas .= $buffer[$i];
        }

        $offset += $length;
        return $datas;
    }

    /**
     * Read a number written in BBO (Bost Byte Order) (ex: a 4 BYTES number require 8 BYTES, 4 for LSM mode and 4 for MSB)
     *
     * @param array<int, int> $buffer
     *
     * @return int The BBO number OR -1 on error
     */
    public static function readBBO(array &$buffer, int $length, int &$offset = 0): int
    {
        $n1 = 0;
        $n2 = 0;
        $len = $length / 2;

        for ($i = 0; $i < $len; $i++) {
            if (! isset($buffer[$offset + ($len - 1 - $i)])) {
                throw new Exception('Failed to read buffer entry ' . ($offset + ($len - 1 - $i)));
            }
            if (! isset($buffer[$offset + $len + $i])) {
                throw new Exception('Failed to read buffer entry ' . ($offset + $len + $i));
            }
            $n1 += $buffer[$offset + ($len - 1 - $i)];
            $n2 += $buffer[$offset + $len + $i];

            if ($i + 1 < $len) {
                $n1 <<= 8;
                $n2 <<= 8;
            }
        }

        if ($n1 !== $n2) {
            return -1;
        }

        $offset += $length;
        return $n1;
    }

    /**
     * Read a number written in LSB mode ("Less Signifient Bit" first)
     *
     * @param array<int, int> $buffer
     */
    public static function readLSB(array &$buffer, int $length, int &$offset = 0): int
    {
        $lsb = 0;
        for ($i = 0; $i < $length; $i++) {
            if (! isset($buffer[$offset + ($length - 1 - $i)])) {
                throw new Exception('Failed to read buffer entry ' . ($offset + ($length - 1 - $i)));
            }

            $lsb += $buffer[$offset + $length - 1 - $i];

            if ($i + 1 < $length) {
                $lsb <<= 8;
            }
        }

        $offset += $length;
        return $lsb;
    }

    /**
     * Read a number written in MSB mode ("Most Signifient Bit" first)
     *
     * @param array<int, int> $buffer
     */
    public static function readMSB(array &$buffer, int $length, int &$offset = 0): int
    {
        $msb = 0;
        for ($i = 0; $i < $length; $i++) {
            if (! isset($buffer[$offset + $i])) {
                throw new Exception('Failed to read buffer entry ' . ($offset + $i));
            }
            $msb += $buffer[$offset + $i];

            if ($i + 1 < $length) {
                $msb <<= 8;
            }
        }

        $offset += $length;
        return $msb;
    }

    /**
     * Read a word (16 bits number)
     *
     * @param array<int, int> $buffer
     */
    public static function readInt16(array &$buffer, int &$offset = 0): int
    {
        $output = 0;

        if (! isset($buffer[$offset + 0])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 0));
        }

        if (! isset($buffer[$offset + 1])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 1));
        }

        $output += $buffer[$offset + 0] << 8;
        $output += $buffer[$offset + 1];

        $offset += 2;
        return $output;
    }

    /**
     * Read a DWORD (32 bits number)
     *
     * @param array<int, int> $buffer
     */
    public static function readInt32(array &$buffer, int &$offset = 0): int
    {
        $output = 0;

        if (! isset($buffer[$offset + 0])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 0));
        }

        if (! isset($buffer[$offset + 1])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 1));
        }

        if (! isset($buffer[$offset + 2])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 2));
        }

        if (! isset($buffer[$offset + 3])) {
            throw new Exception('Failed to read buffer entry ' . ($offset + 3));
        }

        $output += $buffer[$offset + 0] << 24;
        $output += $buffer[$offset + 1] << 16;
        $output += $buffer[$offset + 2] << 8;
        $output += $buffer[$offset + 3];

        $offset += 4;
        return $output;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace PhpIso\Util;
6
7		use PhpIso\Exception;
8
9		class Buffer
10		{
11		/**
12		* Align a number
13		*/
14	4	public static function align(int $num, int $align): int
15		{
16	4	$tmp = (int) ($num / $align);
17	4	if ((int) ($num % $align) > 0) {
18	4	$tmp++;
19		}
20
21	4	return $tmp * $align;
22		}
23
24		/**
25		* Read a string from the buffer
26		*
27		* @param array<int, int> $buffer
28		*/
29	25	public static function getString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
30		{
31	25	$string = '';
32	25	for ($i = $offset; $i < $offset + $length; $i++) {
33	25	if (! isset($buffer[$i])) {
34	1	throw new Exception('Failed to read buffer entry ' . $i);
35		}
36	25	if ($supplementary \|\| $buffer[$i] !== 0) {
37	25	$string .= chr($buffer[$i]);
38		}
39		}
40
41	24	if ($supplementary) {
42	10	$string = mb_convert_encoding($string, 'UTF-8', 'UTF-16');
43
44	10	if ($string === false) {
45		throw new Exception('Failed to convert supplementary string');
46		}
47		}
48
49	24	$offset += $length;
50	24	return $string;
51		}
52
53		/**
54		* Read an a-string from the buffer
55		*
56		* @param array<int, int> $buffer
57		*/
58	18	public static function readAString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
59		{
60	18	return self::getString($buffer, $length, $offset);
61		}
62
63		/**
64		* Read a d-string from the buffer
65		*
66		* @param array<int, int> $buffer
67		*/
68	18	public static function readDString(array &$buffer, int $length, int &$offset = 0, bool $supplementary = false): string
69		{
70	18	return self::getString($buffer, $length, $offset, $supplementary);
71		}
72
73		/**
74		* Read datas from the buffer
75		*
76		* @param array<int, int> $buffer
77		*/
78	19	public static function getBytes(array &$buffer, int $length, int &$offset = 0): string
79		{
80	19	$datas = '';
81	19	for ($i = $offset; $i < $offset + $length; $i++) {
82	19	if (! isset($buffer[$i])) {
83	1	throw new Exception('Failed to read buffer entry ' . $i);
84		}
85	19	$datas .= $buffer[$i];
86		}
87
88	18	$offset += $length;
89	18	return $datas;
90		}
91
92		/**
93		* Read a number written in BBO (Bost Byte Order) (ex: a 4 BYTES number require 8 BYTES, 4 for LSM mode and 4 for MSB)
94		*
95		* @param array<int, int> $buffer
96		*
97		* @return int The BBO number OR -1 on error
98		*/
99	18	public static function readBBO(array &$buffer, int $length, int &$offset = 0): int
100		{
101	18	$n1 = 0;
102	18	$n2 = 0;
103	18	$len = $length / 2;
104
105	18	for ($i = 0; $i < $len; $i++) {
106	18	if (! isset($buffer[$offset + ($len - 1 - $i)])) {
107	1	throw new Exception('Failed to read buffer entry ' . ($offset + ($len - 1 - $i)));
108		}
109	17	if (! isset($buffer[$offset + $len + $i])) {
110		throw new Exception('Failed to read buffer entry ' . ($offset + $len + $i));
111		}
112	17	$n1 += $buffer[$offset + ($len - 1 - $i)];
113	17	$n2 += $buffer[$offset + $len + $i];
114
115	17	if ($i + 1 < $len) {
116	17	$n1 <<= 8;
117	17	$n2 <<= 8;
118		}
119		}
120
121	17	if ($n1 !== $n2) {
122	2	return -1;
123		}
124
125	17	$offset += $length;
126	17	return $n1;
127		}
128
129		/**
130		* Read a number written in LSB mode ("Less Signifient Bit" first)
131		*
132		* @param array<int, int> $buffer
133		*/
134	20	public static function readLSB(array &$buffer, int $length, int &$offset = 0): int
135		{
136	20	$lsb = 0;
137	20	for ($i = 0; $i < $length; $i++) {
138	20	if (! isset($buffer[$offset + ($length - 1 - $i)])) {
139	2	throw new Exception('Failed to read buffer entry ' . ($offset + ($length - 1 - $i)));
140		}
141
142	18	$lsb += $buffer[$offset + $length - 1 - $i];
143
144	18	if ($i + 1 < $length) {
145	18	$lsb <<= 8;
146		}
147		}
148
149	18	$offset += $length;
150	18	return $lsb;
151		}
152
153		/**
154		* Read a number written in MSB mode ("Most Signifient Bit" first)
155		*
156		* @param array<int, int> $buffer
157		*/
158	20	public static function readMSB(array &$buffer, int $length, int &$offset = 0): int
159		{
160	20	$msb = 0;
161	20	for ($i = 0; $i < $length; $i++) {
162	20	if (! isset($buffer[$offset + $i])) {
163	2	throw new Exception('Failed to read buffer entry ' . ($offset + $i));
164		}
165	19	$msb += $buffer[$offset + $i];
166
167	19	if ($i + 1 < $length) {
168	19	$msb <<= 8;
169		}
170		}
171
172	18	$offset += $length;
173	18	return $msb;
174		}
175
176		/**
177		* Read a word (16 bits number)
178		*
179		* @param array<int, int> $buffer
180		*/
181	6	public static function readInt16(array &$buffer, int &$offset = 0): int
182		{
183	6	$output = 0;
184
185	6	if (! isset($buffer[$offset + 0])) {
186	1	throw new Exception('Failed to read buffer entry ' . ($offset + 0));
187		}
188
189	5	if (! isset($buffer[$offset + 1])) {
190	1	throw new Exception('Failed to read buffer entry ' . ($offset + 1));
191		}
192
193	4	$output += $buffer[$offset + 0] << 8;
194	4	$output += $buffer[$offset + 1];
195
196	4	$offset += 2;
197	4	return $output;
198		}
199
200		/**
201		* Read a DWORD (32 bits number)
202		*
203		* @param array<int, int> $buffer
204		*/
205	5	public static function readInt32(array &$buffer, int &$offset = 0): int
206		{
207	5	$output = 0;
208
209	5	if (! isset($buffer[$offset + 0])) {
210		throw new Exception('Failed to read buffer entry ' . ($offset + 0));
211		}
212
213	5	if (! isset($buffer[$offset + 1])) {
214		throw new Exception('Failed to read buffer entry ' . ($offset + 1));
215		}
216
217	5	if (! isset($buffer[$offset + 2])) {
218		throw new Exception('Failed to read buffer entry ' . ($offset + 2));
219		}
220
221	5	if (! isset($buffer[$offset + 3])) {
222	1	throw new Exception('Failed to read buffer entry ' . ($offset + 3));
223		}
224
225	4	$output += $buffer[$offset + 0] << 24;
226	4	$output += $buffer[$offset + 1] << 16;
227	4	$output += $buffer[$offset + 2] << 8;
228	4	$output += $buffer[$offset + 3];
229
230	4	$offset += 4;
231	4	return $output;
232		}
233		}
234

indy2kro / php-iso

Buffer::readInt16() A last analyzed 2025-05-17 06:32 UTC

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Buffer::readInt16() A
last analyzed 2025-05-17 06:32 UTC