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优化文件读取，减少内存使用，提升性能 #1

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优化文件读取，减少内存使用，提升性能 #1

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51 changes: 46 additions & 5 deletions src/ipip/datx/City.php
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ public function __construct($path)

$this->offset = unpack('Nlen', fread($this->file, 4));

$this->index = fread($this->file, $this->offset['len'] - 4);
//$this->index = fread($this->file, $this->offset['len'] - 4);
}

/**
Expand All @@ -57,7 +57,16 @@ public function find($ip)

$idx = (256 * $ips[0] + $ips[1]) * 4;

$start = unpack('Vlen', substr($this->index, $idx, 4));

/////////////////////////////////////////////
//$start = unpack('Vlen', substr($this->index, $idx, 4));

fseek($this->file, 4 + $idx); // offset 时 已经移动了4 字节，所以加4

$start = unpack('Vlen', fread($this->file, 4));

//print_r($start);exit;
////////////////////////////////////////

$off = NULL;
$len = NULL;
Expand All @@ -66,11 +75,43 @@ public function find($ip)

for ($start = $start['len'] * 9 + 262144; $start < $max; $start += 9)
{
$tmp = $this->index[$start] . $this->index[$start + 1] . $this->index[$start + 2] . $this->index[$start + 3];

///////////////////////////////
//$tmp = $this->index[$start] . $this->index[$start + 1] . $this->index[$start + 2] . $this->index[$start + 3];
//$tmp = substr($this->index, $start, 4);

fseek($this->file, 4 + $start); // offset 时 已经移动了4 字节，所以加4

$tmp = fread($this->file, 4);

//print_r(strncmp($tmp, $tmp1, 10));exit;
////////////////////////////


if ($tmp >= $nip2)
{
$off = unpack('Vlen', substr($this->index, $start + 4, 3) . "\x0");
$len = unpack('nlen', $this->index[$start + 7] . $this->index[$start + 8]);
///////////////////////
//$off = unpack('Vlen', substr($this->index, $start + 4, 3) . "\x0");

fseek($this->file, 4 + $start + 4); // offset 时 已经移动了4 字节，所以加4

$off = unpack('Vlen', fread($this->file, 3) . "\x0");

//print_r($off);exit;
////////////////////////



/////////////////////////
//$len = unpack('nlen', $this->index[$start + 7] . $this->index[$start + 8]);
//$len = unpack('nlen', substr($this->index, $start + 7, 2));

fseek($this->file, 4 + $start + 7); // offset 时 已经移动了4 字节，所以加4

$len = unpack('nlen', fread($this->file, 2));

//print_r($len);exit;
/////////////////////////
break;
}
}
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