add geolocation functionality

1 files changed, 374 insertions, 0 deletions

diff --git a/vendor/maxmind-db/reader/src/MaxMind/Db/Reader/Decoder.php b/vendor/maxmind-db/reader/src/MaxMind/Db/Reader/Decoder.php
new file mode 100644
index 0000000..babaed8
--- /dev/null
+++ b/vendor/maxmind-db/reader/src/MaxMind/Db/Reader/Decoder.php
@@ -0,0 +1,374 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MaxMind\Db\Reader;
+
+// @codingStandardsIgnoreLine
+use RuntimeException;
+
+class Decoder
+{
+    /**
+     * @var resource
+     */
+    private $fileStream;
+    /**
+     * @var int
+     */
+    private $pointerBase;
+    /**
+     * @var float
+     */
+    private $pointerBaseByteSize;
+    /**
+     * This is only used for unit testing.
+     *
+     * @var bool
+     */
+    private $pointerTestHack;
+    /**
+     * @var bool
+     */
+    private $switchByteOrder;
+
+    private const _EXTENDED = 0;
+    private const _POINTER = 1;
+    private const _UTF8_STRING = 2;
+    private const _DOUBLE = 3;
+    private const _BYTES = 4;
+    private const _UINT16 = 5;
+    private const _UINT32 = 6;
+    private const _MAP = 7;
+    private const _INT32 = 8;
+    private const _UINT64 = 9;
+    private const _UINT128 = 10;
+    private const _ARRAY = 11;
+    private const _CONTAINER = 12;
+    private const _END_MARKER = 13;
+    private const _BOOLEAN = 14;
+    private const _FLOAT = 15;
+
+    /**
+     * @param resource $fileStream
+     */
+    public function __construct(
+        $fileStream,
+        int $pointerBase = 0,
+        bool $pointerTestHack = false
+    ) {
+        $this->fileStream = $fileStream;
+        $this->pointerBase = $pointerBase;
+
+        $this->pointerBaseByteSize = $pointerBase > 0 ? log($pointerBase, 2) / 8 : 0;
+        $this->pointerTestHack = $pointerTestHack;
+
+        $this->switchByteOrder = $this->isPlatformLittleEndian();
+    }
+
+    public function decode(int $offset): array
+    {
+        $ctrlByte = \ord(Util::read($this->fileStream, $offset, 1));
+        ++$offset;
+
+        $type = $ctrlByte >> 5;
+
+        // Pointers are a special case, we don't read the next $size bytes, we
+        // use the size to determine the length of the pointer and then follow
+        // it.
+        if ($type === self::_POINTER) {
+            [$pointer, $offset] = $this->decodePointer($ctrlByte, $offset);
+
+            // for unit testing
+            if ($this->pointerTestHack) {
+                return [$pointer];
+            }
+
+            [$result] = $this->decode($pointer);
+
+            return [$result, $offset];
+        }
+
+        if ($type === self::_EXTENDED) {
+            $nextByte = \ord(Util::read($this->fileStream, $offset, 1));
+
+            $type = $nextByte + 7;
+
+            if ($type < 8) {
+                throw new InvalidDatabaseException(
+                    'Something went horribly wrong in the decoder. An extended type '
+                    . 'resolved to a type number < 8 ('
+                    . $type
+                    . ')'
+                );
+            }
+
+            ++$offset;
+        }
+
+        [$size, $offset] = $this->sizeFromCtrlByte($ctrlByte, $offset);
+
+        return $this->decodeByType($type, $offset, $size);
+    }
+
+    private function decodeByType(int $type, int $offset, int $size): array
+    {
+        switch ($type) {
+            case self::_MAP:
+                return $this->decodeMap($size, $offset);
+
+            case self::_ARRAY:
+                return $this->decodeArray($size, $offset);
+
+            case self::_BOOLEAN:
+                return [$this->decodeBoolean($size), $offset];
+        }
+
+        $newOffset = $offset + $size;
+        $bytes = Util::read($this->fileStream, $offset, $size);
+
+        switch ($type) {
+            case self::_BYTES:
+            case self::_UTF8_STRING:
+                return [$bytes, $newOffset];
+
+            case self::_DOUBLE:
+                $this->verifySize(8, $size);
+
+                return [$this->decodeDouble($bytes), $newOffset];
+
+            case self::_FLOAT:
+                $this->verifySize(4, $size);
+
+                return [$this->decodeFloat($bytes), $newOffset];
+
+            case self::_INT32:
+                return [$this->decodeInt32($bytes, $size), $newOffset];
+
+            case self::_UINT16:
+            case self::_UINT32:
+            case self::_UINT64:
+            case self::_UINT128:
+                return [$this->decodeUint($bytes, $size), $newOffset];
+
+            default:
+                throw new InvalidDatabaseException(
+                    'Unknown or unexpected type: ' . $type
+                );
+        }
+    }
+
+    private function verifySize(int $expected, int $actual): void
+    {
+        if ($expected !== $actual) {
+            throw new InvalidDatabaseException(
+                "The MaxMind DB file's data section contains bad data (unknown data type or corrupt data)"
+            );
+        }
+    }
+
+    private function decodeArray(int $size, int $offset): array
+    {
+        $array = [];
+
+        for ($i = 0; $i < $size; ++$i) {
+            [$value, $offset] = $this->decode($offset);
+            $array[] = $value;
+        }
+
+        return [$array, $offset];
+    }
+
+    private function decodeBoolean(int $size): bool
+    {
+        return $size !== 0;
+    }
+
+    private function decodeDouble(string $bytes): float
+    {
+        // This assumes IEEE 754 doubles, but most (all?) modern platforms
+        // use them.
+        [, $double] = unpack('E', $bytes);
+
+        return $double;
+    }
+
+    private function decodeFloat(string $bytes): float
+    {
+        // This assumes IEEE 754 floats, but most (all?) modern platforms
+        // use them.
+        [, $float] = unpack('G', $bytes);
+
+        return $float;
+    }
+
+    private function decodeInt32(string $bytes, int $size): int
+    {
+        switch ($size) {
+            case 0:
+                return 0;
+
+            case 1:
+            case 2:
+            case 3:
+                $bytes = str_pad($bytes, 4, "\x00", \STR_PAD_LEFT);
+
+                break;
+
+            case 4:
+                break;
+
+            default:
+                throw new InvalidDatabaseException(
+                    "The MaxMind DB file's data section contains bad data (unknown data type or corrupt data)"
+                );
+        }
+
+        [, $int] = unpack('l', $this->maybeSwitchByteOrder($bytes));
+
+        return $int;
+    }
+
+    private function decodeMap(int $size, int $offset): array
+    {
+        $map = [];
+
+        for ($i = 0; $i < $size; ++$i) {
+            [$key, $offset] = $this->decode($offset);
+            [$value, $offset] = $this->decode($offset);
+            $map[$key] = $value;
+        }
+
+        return [$map, $offset];
+    }
+
+    private function decodePointer(int $ctrlByte, int $offset): array
+    {
+        $pointerSize = (($ctrlByte >> 3) & 0x3) + 1;
+
+        $buffer = Util::read($this->fileStream, $offset, $pointerSize);
+        $offset = $offset + $pointerSize;
+
+        switch ($pointerSize) {
+            case 1:
+                $packed = \chr($ctrlByte & 0x7) . $buffer;
+                [, $pointer] = unpack('n', $packed);
+                $pointer += $this->pointerBase;
+
+                break;
+
+            case 2:
+                $packed = "\x00" . \chr($ctrlByte & 0x7) . $buffer;
+                [, $pointer] = unpack('N', $packed);
+                $pointer += $this->pointerBase + 2048;
+
+                break;
+
+            case 3:
+                $packed = \chr($ctrlByte & 0x7) . $buffer;
+
+                // It is safe to use 'N' here, even on 32 bit machines as the
+                // first bit is 0.
+                [, $pointer] = unpack('N', $packed);
+                $pointer += $this->pointerBase + 526336;
+
+                break;
+
+            case 4:
+                // We cannot use unpack here as we might overflow on 32 bit
+                // machines
+                $pointerOffset = $this->decodeUint($buffer, $pointerSize);
+
+                $pointerBase = $this->pointerBase;
+
+                if (\PHP_INT_MAX - $pointerBase >= $pointerOffset) {
+                    $pointer = $pointerOffset + $pointerBase;
+                } else {
+                    throw new RuntimeException(
+                        'The database offset is too large to be represented on your platform.'
+                    );
+                }
+
+                break;
+
+            default:
+                throw new InvalidDatabaseException(
+                    'Unexpected pointer size ' . $pointerSize
+                );
+        }
+
+        return [$pointer, $offset];
+    }
+
+    // @phpstan-ignore-next-line
+    private function decodeUint(string $bytes, int $byteLength)
+    {
+        if ($byteLength === 0) {
+            return 0;
+        }
+
+        $integer = 0;
+
+        // PHP integers are signed. PHP_INT_SIZE - 1 is the number of
+        // complete bytes that can be converted to an integer. However,
+        // we can convert another byte if the leading bit is zero.
+        $useRealInts = $byteLength <= \PHP_INT_SIZE - 1
+            || ($byteLength === \PHP_INT_SIZE && (\ord($bytes[0]) & 0x80) === 0);
+
+        for ($i = 0; $i < $byteLength; ++$i) {
+            $part = \ord($bytes[$i]);
+
+            // We only use gmp or bcmath if the final value is too big
+            if ($useRealInts) {
+                $integer = ($integer << 8) + $part;
+            } elseif (\extension_loaded('gmp')) {
+                $integer = gmp_strval(gmp_add(gmp_mul((string) $integer, '256'), $part));
+            } elseif (\extension_loaded('bcmath')) {
+                $integer = bcadd(bcmul((string) $integer, '256'), (string) $part);
+            } else {
+                throw new RuntimeException(
+                    'The gmp or bcmath extension must be installed to read this database.'
+                );
+            }
+        }
+
+        return $integer;
+    }
+
+    private function sizeFromCtrlByte(int $ctrlByte, int $offset): array
+    {
+        $size = $ctrlByte & 0x1F;
+
+        if ($size < 29) {
+            return [$size, $offset];
+        }
+
+        $bytesToRead = $size - 28;
+        $bytes = Util::read($this->fileStream, $offset, $bytesToRead);
+
+        if ($size === 29) {
+            $size = 29 + \ord($bytes);
+        } elseif ($size === 30) {
+            [, $adjust] = unpack('n', $bytes);
+            $size = 285 + $adjust;
+        } else {
+            [, $adjust] = unpack('N', "\x00" . $bytes);
+            $size = $adjust + 65821;
+        }
+
+        return [$size, $offset + $bytesToRead];
+    }
+
+    private function maybeSwitchByteOrder(string $bytes): string
+    {
+        return $this->switchByteOrder ? strrev($bytes) : $bytes;
+    }
+
+    private function isPlatformLittleEndian(): bool
+    {
+        $testint = 0x00FF;
+        $packed = pack('S', $testint);
+
+        return $testint === current(unpack('v', $packed));
+    }
+}