Included new GeoLite2 DB reader library
This commit is contained in:
Claudio Sanches
parent
824a801376
commit
f24fe25c7d
|
|
@ -0,0 +1,309 @@
|
|||
<?php
|
||||
|
||||
namespace MaxMind\Db;
|
||||
|
||||
use MaxMind\Db\Reader\Decoder;
|
||||
use MaxMind\Db\Reader\InvalidDatabaseException;
|
||||
use MaxMind\Db\Reader\Metadata;
|
||||
use MaxMind\Db\Reader\Util;
|
||||
|
||||
/**
|
||||
* Instances of this class provide a reader for the MaxMind DB format. IP
|
||||
* addresses can be looked up using the <code>get</code> method.
|
||||
*/
|
||||
class Reader
|
||||
{
|
||||
private static $DATA_SECTION_SEPARATOR_SIZE = 16;
|
||||
private static $METADATA_START_MARKER = "\xAB\xCD\xEFMaxMind.com";
|
||||
private static $METADATA_START_MARKER_LENGTH = 14;
|
||||
private static $METADATA_MAX_SIZE = 131072; // 128 * 1024 = 128KB
|
||||
|
||||
private $decoder;
|
||||
private $fileHandle;
|
||||
private $fileSize;
|
||||
private $ipV4Start;
|
||||
private $metadata;
|
||||
|
||||
/**
|
||||
* Constructs a Reader for the MaxMind DB format. The file passed to it must
|
||||
* be a valid MaxMind DB file such as a GeoIp2 database file.
|
||||
*
|
||||
* @param string $database
|
||||
* the MaxMind DB file to use
|
||||
*
|
||||
* @throws \InvalidArgumentException for invalid database path or unknown arguments
|
||||
* @throws \MaxMind\Db\Reader\InvalidDatabaseException
|
||||
* if the database is invalid or there is an error reading
|
||||
* from it
|
||||
*/
|
||||
public function __construct($database)
|
||||
{
|
||||
if (func_num_args() !== 1) {
|
||||
throw new \InvalidArgumentException(
|
||||
'The constructor takes exactly one argument.'
|
||||
);
|
||||
}
|
||||
|
||||
if (!is_readable($database)) {
|
||||
throw new \InvalidArgumentException(
|
||||
"The file \"$database\" does not exist or is not readable."
|
||||
);
|
||||
}
|
||||
$this->fileHandle = @fopen($database, 'rb');
|
||||
if ($this->fileHandle === false) {
|
||||
throw new \InvalidArgumentException(
|
||||
"Error opening \"$database\"."
|
||||
);
|
||||
}
|
||||
$this->fileSize = @filesize($database);
|
||||
if ($this->fileSize === false) {
|
||||
throw new \UnexpectedValueException(
|
||||
"Error determining the size of \"$database\"."
|
||||
);
|
||||
}
|
||||
|
||||
$start = $this->findMetadataStart($database);
|
||||
$metadataDecoder = new Decoder($this->fileHandle, $start);
|
||||
list($metadataArray) = $metadataDecoder->decode($start);
|
||||
$this->metadata = new Metadata($metadataArray);
|
||||
$this->decoder = new Decoder(
|
||||
$this->fileHandle,
|
||||
$this->metadata->searchTreeSize + self::$DATA_SECTION_SEPARATOR_SIZE
|
||||
);
|
||||
}
|
||||
|
||||
/**
|
||||
* Looks up the <code>address</code> in the MaxMind DB.
|
||||
*
|
||||
* @param string $ipAddress
|
||||
* the IP address to look up
|
||||
*
|
||||
* @throws \BadMethodCallException if this method is called on a closed database
|
||||
* @throws \InvalidArgumentException if something other than a single IP address is passed to the method
|
||||
* @throws InvalidDatabaseException
|
||||
* if the database is invalid or there is an error reading
|
||||
* from it
|
||||
*
|
||||
* @return array the record for the IP address
|
||||
*/
|
||||
public function get($ipAddress)
|
||||
{
|
||||
if (func_num_args() !== 1) {
|
||||
throw new \InvalidArgumentException(
|
||||
'Method takes exactly one argument.'
|
||||
);
|
||||
}
|
||||
|
||||
if (!is_resource($this->fileHandle)) {
|
||||
throw new \BadMethodCallException(
|
||||
'Attempt to read from a closed MaxMind DB.'
|
||||
);
|
||||
}
|
||||
|
||||
if (!filter_var($ipAddress, FILTER_VALIDATE_IP)) {
|
||||
throw new \InvalidArgumentException(
|
||||
"The value \"$ipAddress\" is not a valid IP address."
|
||||
);
|
||||
}
|
||||
|
||||
if ($this->metadata->ipVersion === 4 && strrpos($ipAddress, ':')) {
|
||||
throw new \InvalidArgumentException(
|
||||
"Error looking up $ipAddress. You attempted to look up an"
|
||||
. ' IPv6 address in an IPv4-only database.'
|
||||
);
|
||||
}
|
||||
$pointer = $this->findAddressInTree($ipAddress);
|
||||
if ($pointer === 0) {
|
||||
return null;
|
||||
}
|
||||
|
||||
return $this->resolveDataPointer($pointer);
|
||||
}
|
||||
|
||||
private function findAddressInTree($ipAddress)
|
||||
{
|
||||
// XXX - could simplify. Done as a byte array to ease porting
|
||||
$rawAddress = array_merge(unpack('C*', inet_pton($ipAddress)));
|
||||
|
||||
$bitCount = count($rawAddress) * 8;
|
||||
|
||||
// The first node of the tree is always node 0, at the beginning of the
|
||||
// value
|
||||
$node = $this->startNode($bitCount);
|
||||
|
||||
for ($i = 0; $i < $bitCount; $i++) {
|
||||
if ($node >= $this->metadata->nodeCount) {
|
||||
break;
|
||||
}
|
||||
$tempBit = 0xFF & $rawAddress[$i >> 3];
|
||||
$bit = 1 & ($tempBit >> 7 - ($i % 8));
|
||||
|
||||
$node = $this->readNode($node, $bit);
|
||||
}
|
||||
if ($node === $this->metadata->nodeCount) {
|
||||
// Record is empty
|
||||
return 0;
|
||||
} elseif ($node > $this->metadata->nodeCount) {
|
||||
// Record is a data pointer
|
||||
return $node;
|
||||
}
|
||||
throw new InvalidDatabaseException('Something bad happened');
|
||||
}
|
||||
|
||||
private function startNode($length)
|
||||
{
|
||||
// Check if we are looking up an IPv4 address in an IPv6 tree. If this
|
||||
// is the case, we can skip over the first 96 nodes.
|
||||
if ($this->metadata->ipVersion === 6 && $length === 32) {
|
||||
return $this->ipV4StartNode();
|
||||
}
|
||||
// The first node of the tree is always node 0, at the beginning of the
|
||||
// value
|
||||
return 0;
|
||||
}
|
||||
|
||||
private function ipV4StartNode()
|
||||
{
|
||||
// This is a defensive check. There is no reason to call this when you
|
||||
// have an IPv4 tree.
|
||||
if ($this->metadata->ipVersion === 4) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
if ($this->ipV4Start) {
|
||||
return $this->ipV4Start;
|
||||
}
|
||||
$node = 0;
|
||||
|
||||
for ($i = 0; $i < 96 && $node < $this->metadata->nodeCount; $i++) {
|
||||
$node = $this->readNode($node, 0);
|
||||
}
|
||||
$this->ipV4Start = $node;
|
||||
|
||||
return $node;
|
||||
}
|
||||
|
||||
private function readNode($nodeNumber, $index)
|
||||
{
|
||||
$baseOffset = $nodeNumber * $this->metadata->nodeByteSize;
|
||||
|
||||
// XXX - probably could condense this.
|
||||
switch ($this->metadata->recordSize) {
|
||||
case 24:
|
||||
$bytes = Util::read($this->fileHandle, $baseOffset + $index * 3, 3);
|
||||
list(, $node) = unpack('N', "\x00" . $bytes);
|
||||
|
||||
return $node;
|
||||
case 28:
|
||||
$middleByte = Util::read($this->fileHandle, $baseOffset + 3, 1);
|
||||
list(, $middle) = unpack('C', $middleByte);
|
||||
if ($index === 0) {
|
||||
$middle = (0xF0 & $middle) >> 4;
|
||||
} else {
|
||||
$middle = 0x0F & $middle;
|
||||
}
|
||||
$bytes = Util::read($this->fileHandle, $baseOffset + $index * 4, 3);
|
||||
list(, $node) = unpack('N', chr($middle) . $bytes);
|
||||
|
||||
return $node;
|
||||
case 32:
|
||||
$bytes = Util::read($this->fileHandle, $baseOffset + $index * 4, 4);
|
||||
list(, $node) = unpack('N', $bytes);
|
||||
|
||||
return $node;
|
||||
default:
|
||||
throw new InvalidDatabaseException(
|
||||
'Unknown record size: '
|
||||
. $this->metadata->recordSize
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
private function resolveDataPointer($pointer)
|
||||
{
|
||||
$resolved = $pointer - $this->metadata->nodeCount
|
||||
+ $this->metadata->searchTreeSize;
|
||||
if ($resolved > $this->fileSize) {
|
||||
throw new InvalidDatabaseException(
|
||||
"The MaxMind DB file's search tree is corrupt"
|
||||
);
|
||||
}
|
||||
|
||||
list($data) = $this->decoder->decode($resolved);
|
||||
|
||||
return $data;
|
||||
}
|
||||
|
||||
/*
|
||||
* This is an extremely naive but reasonably readable implementation. There
|
||||
* are much faster algorithms (e.g., Boyer-Moore) for this if speed is ever
|
||||
* an issue, but I suspect it won't be.
|
||||
*/
|
||||
private function findMetadataStart($filename)
|
||||
{
|
||||
$handle = $this->fileHandle;
|
||||
$fstat = fstat($handle);
|
||||
$fileSize = $fstat['size'];
|
||||
$marker = self::$METADATA_START_MARKER;
|
||||
$markerLength = self::$METADATA_START_MARKER_LENGTH;
|
||||
$metadataMaxLengthExcludingMarker
|
||||
= min(self::$METADATA_MAX_SIZE, $fileSize) - $markerLength;
|
||||
|
||||
for ($i = 0; $i <= $metadataMaxLengthExcludingMarker; $i++) {
|
||||
for ($j = 0; $j < $markerLength; $j++) {
|
||||
fseek($handle, $fileSize - $i - $j - 1);
|
||||
$matchBit = fgetc($handle);
|
||||
if ($matchBit !== $marker[$markerLength - $j - 1]) {
|
||||
continue 2;
|
||||
}
|
||||
}
|
||||
|
||||
return $fileSize - $i;
|
||||
}
|
||||
throw new InvalidDatabaseException(
|
||||
"Error opening database file ($filename). " .
|
||||
'Is this a valid MaxMind DB file?'
|
||||
);
|
||||
}
|
||||
|
||||
/**
|
||||
* @throws \InvalidArgumentException if arguments are passed to the method
|
||||
* @throws \BadMethodCallException if the database has been closed
|
||||
*
|
||||
* @return Metadata object for the database
|
||||
*/
|
||||
public function metadata()
|
||||
{
|
||||
if (func_num_args()) {
|
||||
throw new \InvalidArgumentException(
|
||||
'Method takes no arguments.'
|
||||
);
|
||||
}
|
||||
|
||||
// Not technically required, but this makes it consistent with
|
||||
// C extension and it allows us to change our implementation later.
|
||||
if (!is_resource($this->fileHandle)) {
|
||||
throw new \BadMethodCallException(
|
||||
'Attempt to read from a closed MaxMind DB.'
|
||||
);
|
||||
}
|
||||
|
||||
return $this->metadata;
|
||||
}
|
||||
|
||||
/**
|
||||
* Closes the MaxMind DB and returns resources to the system.
|
||||
*
|
||||
* @throws \Exception
|
||||
* if an I/O error occurs
|
||||
*/
|
||||
public function close()
|
||||
{
|
||||
if (!is_resource($this->fileHandle)) {
|
||||
throw new \BadMethodCallException(
|
||||
'Attempt to close a closed MaxMind DB.'
|
||||
);
|
||||
}
|
||||
fclose($this->fileHandle);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,311 @@
|
|||
<?php
|
||||
|
||||
namespace MaxMind\Db\Reader;
|
||||
|
||||
class Decoder
|
||||
{
|
||||
private $fileStream;
|
||||
private $pointerBase;
|
||||
// This is only used for unit testing
|
||||
private $pointerTestHack;
|
||||
private $switchByteOrder;
|
||||
|
||||
private $types = [
|
||||
0 => 'extended',
|
||||
1 => 'pointer',
|
||||
2 => 'utf8_string',
|
||||
3 => 'double',
|
||||
4 => 'bytes',
|
||||
5 => 'uint16',
|
||||
6 => 'uint32',
|
||||
7 => 'map',
|
||||
8 => 'int32',
|
||||
9 => 'uint64',
|
||||
10 => 'uint128',
|
||||
11 => 'array',
|
||||
12 => 'container',
|
||||
13 => 'end_marker',
|
||||
14 => 'boolean',
|
||||
15 => 'float',
|
||||
];
|
||||
|
||||
public function __construct(
|
||||
$fileStream,
|
||||
$pointerBase = 0,
|
||||
$pointerTestHack = false
|
||||
) {
|
||||
$this->fileStream = $fileStream;
|
||||
$this->pointerBase = $pointerBase;
|
||||
$this->pointerTestHack = $pointerTestHack;
|
||||
|
||||
$this->switchByteOrder = $this->isPlatformLittleEndian();
|
||||
}
|
||||
|
||||
public function decode($offset)
|
||||
{
|
||||
list(, $ctrlByte) = unpack(
|
||||
'C',
|
||||
Util::read($this->fileStream, $offset, 1)
|
||||
);
|
||||
$offset++;
|
||||
|
||||
$type = $this->types[$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 === 'pointer') {
|
||||
list($pointer, $offset) = $this->decodePointer($ctrlByte, $offset);
|
||||
|
||||
// for unit testing
|
||||
if ($this->pointerTestHack) {
|
||||
return [$pointer];
|
||||
}
|
||||
|
||||
list($result) = $this->decode($pointer);
|
||||
|
||||
return [$result, $offset];
|
||||
}
|
||||
|
||||
if ($type === 'extended') {
|
||||
list(, $nextByte) = unpack(
|
||||
'C',
|
||||
Util::read($this->fileStream, $offset, 1)
|
||||
);
|
||||
|
||||
$typeNum = $nextByte + 7;
|
||||
|
||||
if ($typeNum < 8) {
|
||||
throw new InvalidDatabaseException(
|
||||
'Something went horribly wrong in the decoder. An extended type '
|
||||
. 'resolved to a type number < 8 ('
|
||||
. $this->types[$typeNum]
|
||||
. ')'
|
||||
);
|
||||
}
|
||||
|
||||
$type = $this->types[$typeNum];
|
||||
$offset++;
|
||||
}
|
||||
|
||||
list($size, $offset) = $this->sizeFromCtrlByte($ctrlByte, $offset);
|
||||
|
||||
return $this->decodeByType($type, $offset, $size);
|
||||
}
|
||||
|
||||
private function decodeByType($type, $offset, $size)
|
||||
{
|
||||
switch ($type) {
|
||||
case 'map':
|
||||
return $this->decodeMap($size, $offset);
|
||||
case 'array':
|
||||
return $this->decodeArray($size, $offset);
|
||||
case 'boolean':
|
||||
return [$this->decodeBoolean($size), $offset];
|
||||
}
|
||||
|
||||
$newOffset = $offset + $size;
|
||||
$bytes = Util::read($this->fileStream, $offset, $size);
|
||||
switch ($type) {
|
||||
case 'utf8_string':
|
||||
return [$this->decodeString($bytes), $newOffset];
|
||||
case 'double':
|
||||
$this->verifySize(8, $size);
|
||||
|
||||
return [$this->decodeDouble($bytes), $newOffset];
|
||||
case 'float':
|
||||
$this->verifySize(4, $size);
|
||||
|
||||
return [$this->decodeFloat($bytes), $newOffset];
|
||||
case 'bytes':
|
||||
return [$bytes, $newOffset];
|
||||
case 'uint16':
|
||||
case 'uint32':
|
||||
return [$this->decodeUint($bytes), $newOffset];
|
||||
case 'int32':
|
||||
return [$this->decodeInt32($bytes), $newOffset];
|
||||
case 'uint64':
|
||||
case 'uint128':
|
||||
return [$this->decodeBigUint($bytes, $size), $newOffset];
|
||||
default:
|
||||
throw new InvalidDatabaseException(
|
||||
'Unknown or unexpected type: ' . $type
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
private function verifySize($expected, $actual)
|
||||
{
|
||||
if ($expected !== $actual) {
|
||||
throw new InvalidDatabaseException(
|
||||
"The MaxMind DB file's data section contains bad data (unknown data type or corrupt data)"
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
private function decodeArray($size, $offset)
|
||||
{
|
||||
$array = [];
|
||||
|
||||
for ($i = 0; $i < $size; $i++) {
|
||||
list($value, $offset) = $this->decode($offset);
|
||||
array_push($array, $value);
|
||||
}
|
||||
|
||||
return [$array, $offset];
|
||||
}
|
||||
|
||||
private function decodeBoolean($size)
|
||||
{
|
||||
return $size === 0 ? false : true;
|
||||
}
|
||||
|
||||
private function decodeDouble($bits)
|
||||
{
|
||||
// XXX - Assumes IEEE 754 double on platform
|
||||
list(, $double) = unpack('d', $this->maybeSwitchByteOrder($bits));
|
||||
|
||||
return $double;
|
||||
}
|
||||
|
||||
private function decodeFloat($bits)
|
||||
{
|
||||
// XXX - Assumes IEEE 754 floats on platform
|
||||
list(, $float) = unpack('f', $this->maybeSwitchByteOrder($bits));
|
||||
|
||||
return $float;
|
||||
}
|
||||
|
||||
private function decodeInt32($bytes)
|
||||
{
|
||||
$bytes = $this->zeroPadLeft($bytes, 4);
|
||||
list(, $int) = unpack('l', $this->maybeSwitchByteOrder($bytes));
|
||||
|
||||
return $int;
|
||||
}
|
||||
|
||||
private function decodeMap($size, $offset)
|
||||
{
|
||||
$map = [];
|
||||
|
||||
for ($i = 0; $i < $size; $i++) {
|
||||
list($key, $offset) = $this->decode($offset);
|
||||
list($value, $offset) = $this->decode($offset);
|
||||
$map[$key] = $value;
|
||||
}
|
||||
|
||||
return [$map, $offset];
|
||||
}
|
||||
|
||||
private $pointerValueOffset = [
|
||||
1 => 0,
|
||||
2 => 2048,
|
||||
3 => 526336,
|
||||
4 => 0,
|
||||
];
|
||||
|
||||
private function decodePointer($ctrlByte, $offset)
|
||||
{
|
||||
$pointerSize = (($ctrlByte >> 3) & 0x3) + 1;
|
||||
|
||||
$buffer = Util::read($this->fileStream, $offset, $pointerSize);
|
||||
$offset = $offset + $pointerSize;
|
||||
|
||||
$packed = $pointerSize === 4
|
||||
? $buffer
|
||||
: (pack('C', $ctrlByte & 0x7)) . $buffer;
|
||||
|
||||
$unpacked = $this->decodeUint($packed);
|
||||
$pointer = $unpacked + $this->pointerBase
|
||||
+ $this->pointerValueOffset[$pointerSize];
|
||||
|
||||
return [$pointer, $offset];
|
||||
}
|
||||
|
||||
private function decodeUint($bytes)
|
||||
{
|
||||
list(, $int) = unpack('N', $this->zeroPadLeft($bytes, 4));
|
||||
|
||||
return $int;
|
||||
}
|
||||
|
||||
private function decodeBigUint($bytes, $byteLength)
|
||||
{
|
||||
$maxUintBytes = log(PHP_INT_MAX, 2) / 8;
|
||||
|
||||
if ($byteLength === 0) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
$numberOfLongs = ceil($byteLength / 4);
|
||||
$paddedLength = $numberOfLongs * 4;
|
||||
$paddedBytes = $this->zeroPadLeft($bytes, $paddedLength);
|
||||
$unpacked = array_merge(unpack("N$numberOfLongs", $paddedBytes));
|
||||
|
||||
$integer = 0;
|
||||
|
||||
// 2^32
|
||||
$twoTo32 = '4294967296';
|
||||
|
||||
foreach ($unpacked as $part) {
|
||||
// We only use gmp or bcmath if the final value is too big
|
||||
if ($byteLength <= $maxUintBytes) {
|
||||
$integer = ($integer << 32) + $part;
|
||||
} elseif (extension_loaded('gmp')) {
|
||||
$integer = gmp_strval(gmp_add(gmp_mul($integer, $twoTo32), $part));
|
||||
} elseif (extension_loaded('bcmath')) {
|
||||
$integer = bcadd(bcmul($integer, $twoTo32), $part);
|
||||
} else {
|
||||
throw new \RuntimeException(
|
||||
'The gmp or bcmath extension must be installed to read this database.'
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
return $integer;
|
||||
}
|
||||
|
||||
private function decodeString($bytes)
|
||||
{
|
||||
// XXX - NOOP. As far as I know, the end user has to explicitly set the
|
||||
// encoding in PHP. Strings are just bytes.
|
||||
return $bytes;
|
||||
}
|
||||
|
||||
private function sizeFromCtrlByte($ctrlByte, $offset)
|
||||
{
|
||||
$size = $ctrlByte & 0x1f;
|
||||
$bytesToRead = $size < 29 ? 0 : $size - 28;
|
||||
$bytes = Util::read($this->fileStream, $offset, $bytesToRead);
|
||||
$decoded = $this->decodeUint($bytes);
|
||||
|
||||
if ($size === 29) {
|
||||
$size = 29 + $decoded;
|
||||
} elseif ($size === 30) {
|
||||
$size = 285 + $decoded;
|
||||
} elseif ($size > 30) {
|
||||
$size = ($decoded & (0x0FFFFFFF >> (32 - (8 * $bytesToRead))))
|
||||
+ 65821;
|
||||
}
|
||||
|
||||
return [$size, $offset + $bytesToRead];
|
||||
}
|
||||
|
||||
private function zeroPadLeft($content, $desiredLength)
|
||||
{
|
||||
return str_pad($content, $desiredLength, "\x00", STR_PAD_LEFT);
|
||||
}
|
||||
|
||||
private function maybeSwitchByteOrder($bytes)
|
||||
{
|
||||
return $this->switchByteOrder ? strrev($bytes) : $bytes;
|
||||
}
|
||||
|
||||
private function isPlatformLittleEndian()
|
||||
{
|
||||
$testint = 0x00FF;
|
||||
$packed = pack('S', $testint);
|
||||
|
||||
return $testint === current(unpack('v', $packed));
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,10 @@
|
|||
<?php
|
||||
|
||||
namespace MaxMind\Db\Reader;
|
||||
|
||||
/**
|
||||
* This class should be thrown when unexpected data is found in the database.
|
||||
*/
|
||||
class InvalidDatabaseException extends \Exception
|
||||
{
|
||||
}
|
||||
|
|
@ -0,0 +1,69 @@
|
|||
<?php
|
||||
|
||||
namespace MaxMind\Db\Reader;
|
||||
|
||||
/**
|
||||
* This class provides the metadata for the MaxMind DB file.
|
||||
*
|
||||
* @property int nodeCount This is an unsigned 32-bit integer indicating
|
||||
* the number of nodes in the search tree.
|
||||
* @property int recordSize This is an unsigned 16-bit integer. It
|
||||
* indicates the number of bits in a record in the search tree. Note that each
|
||||
* node consists of two records.
|
||||
* @property int ipVersion This is an unsigned 16-bit integer which is
|
||||
* always 4 or 6. It indicates whether the database contains IPv4 or IPv6
|
||||
* address data.
|
||||
* @property string databaseType This is a string that indicates the structure
|
||||
* of each data record associated with an IP address. The actual definition of
|
||||
* these structures is left up to the database creator.
|
||||
* @property array languages An array of strings, each of which is a language
|
||||
* code. A given record may contain data items that have been localized to
|
||||
* some or all of these languages. This may be undefined.
|
||||
* @property int binaryFormatMajorVersion This is an unsigned 16-bit
|
||||
* integer indicating the major version number for the database's binary
|
||||
* format.
|
||||
* @property int binaryFormatMinorVersion This is an unsigned 16-bit
|
||||
* integer indicating the minor version number for the database's binary format.
|
||||
* @property int buildEpoch This is an unsigned 64-bit integer that
|
||||
* contains the database build timestamp as a Unix epoch value.
|
||||
* @property array description This key will always point to a map
|
||||
* (associative array). The keys of that map will be language codes, and the
|
||||
* values will be a description in that language as a UTF-8 string. May be
|
||||
* undefined for some databases.
|
||||
*/
|
||||
class Metadata
|
||||
{
|
||||
private $binaryFormatMajorVersion;
|
||||
private $binaryFormatMinorVersion;
|
||||
private $buildEpoch;
|
||||
private $databaseType;
|
||||
private $description;
|
||||
private $ipVersion;
|
||||
private $languages;
|
||||
private $nodeByteSize;
|
||||
private $nodeCount;
|
||||
private $recordSize;
|
||||
private $searchTreeSize;
|
||||
|
||||
public function __construct($metadata)
|
||||
{
|
||||
$this->binaryFormatMajorVersion =
|
||||
$metadata['binary_format_major_version'];
|
||||
$this->binaryFormatMinorVersion =
|
||||
$metadata['binary_format_minor_version'];
|
||||
$this->buildEpoch = $metadata['build_epoch'];
|
||||
$this->databaseType = $metadata['database_type'];
|
||||
$this->languages = $metadata['languages'];
|
||||
$this->description = $metadata['description'];
|
||||
$this->ipVersion = $metadata['ip_version'];
|
||||
$this->nodeCount = $metadata['node_count'];
|
||||
$this->recordSize = $metadata['record_size'];
|
||||
$this->nodeByteSize = $this->recordSize / 4;
|
||||
$this->searchTreeSize = $this->nodeCount * $this->nodeByteSize;
|
||||
}
|
||||
|
||||
public function __get($var)
|
||||
{
|
||||
return $this->$var;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,26 @@
|
|||
<?php
|
||||
|
||||
namespace MaxMind\Db\Reader;
|
||||
|
||||
class Util
|
||||
{
|
||||
public static function read($stream, $offset, $numberOfBytes)
|
||||
{
|
||||
if ($numberOfBytes === 0) {
|
||||
return '';
|
||||
}
|
||||
if (fseek($stream, $offset) === 0) {
|
||||
$value = fread($stream, $numberOfBytes);
|
||||
|
||||
// We check that the number of bytes read is equal to the number
|
||||
// asked for. We use ftell as getting the length of $value is
|
||||
// much slower.
|
||||
if (ftell($stream) - $offset === $numberOfBytes) {
|
||||
return $value;
|
||||
}
|
||||
}
|
||||
throw new InvalidDatabaseException(
|
||||
'The MaxMind DB file contains bad data'
|
||||
);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue