diff --git a/src/IO/File.php b/src/IO/File.php
index d5511a92..10b3304b 100644
--- a/src/IO/File.php
+++ b/src/IO/File.php
@@ -1,167 +1,26 @@
 <?php
 namespace Misuzu\IO;
 
-use ErrorException;
-
 /**
- * Wrapper for f* (file stream) functions and other cool stuff.
+ * Static file meta functions.
  * @package Misuzu\IO
  * @author flashwave <me@flash.moe>
  */
 class File
 {
-    /**
-     * Open + Read flag.
-     */
-    public const OPEN_READ = 'rb';
-
-    /**
-     * Open + Write flag.
-     */
-    public const OPEN_WRITE = 'cb';
-
-    /**
-     * Open + Read + Write flag.
-     */
-    public const OPEN_READ_WRITE = 'rb+';
-
-    /**
-     * Create (truncates!) + Write flag.
-     */
-    public const CREATE_WRITE = 'wb';
-
-    /**
-     * Create (truncates!) + Read + Write flag.
-     */
-    public const CREATE_READ_WRITE = 'wb+';
-
-    /**
-     * Open + Write flag.
-     */
-    public const OPEN_CREATE_WRITE = 'xb';
-
-    /**
-     * Open or Create + Read + Write flag.
-     */
-    public const OPEN_CREATE_READ_WRITE = 'xb+';
-
-    /**
-     * Resource/stream container.
-     * @var resource
-     */
-    private $resource;
-
-    /**
-     * Filename.
-     * @var string
-     */
-    public $name = '';
-
-    /**
-     * Real, fixed path.
-     * @var string
-     */
-    public $path = '';
-
-    /**
-     * Filesize in bytes.
-     * @var int
-     */
-    public $size = 0;
-
-    /**
-     * ID of file owner.
-     * @var int
-     */
-    public $owner = 0;
-
-    /**
-     * ID of file's owning group.
-     * @var int
-     */
-    public $group = 0;
-
-    /**
-     * Last time this file has been accessed.
-     * @var int
-     */
-    public $accessTime = 0;
-
-    /**
-     * Last time this file has been modified.
-     * @var int
-     */
-    public $modifiedTime = 0;
-
-    /**
-     * Current stream position.
-     * @var int
-     */
-    public $position = 0;
-
-    /**
-     * Fixes path and opens resource.
-     * @param string $path
-     * @param string $mode
-     * @throws FileDoesNotExistException
-     * @throws IOException
-     */
-    public function __construct(string $path, string $mode)
+    public static function open(string $filename): FileStream
     {
-        $path = Directory::fixSlashes($path);
-        $this->path = realpath($path);
-        $this->name = basename($this->path);
-
-        try {
-            $this->resource = fopen($path, $mode, false);
-        } catch (ErrorException $e) {
-            throw new FileDoesNotExistException($e->getMessage());
-        }
-
-        if (!is_resource($this->resource)) {
-            throw new IOException('Failed to create resource.');
-        }
-
-        $this->updateMetaData();
-    }
-
-    /**
-     * Updates the meta data of the resource.
-     */
-    private function updateMetaData(): void
-    {
-        $meta = fstat($this->resource);
-        $this->size = intval($meta['size']);
-        $this->owner = intval($meta['uid']);
-        $this->group = intval($meta['gid']);
-        $this->accessTime = intval($meta['atime']);
-        $this->modifiedTime = intval($meta['mtime']);
-    }
-
-    /**
-     * Updates the position variable.
-     */
-    private function updatePosition(): void
-    {
-        $this->position = ftell($this->resource);
-    }
-
-    /**
-     * Calls the close method.
-     */
-    public function __destruct()
-    {
-        $this->close();
+        return new FileStream($filename, FileStream::MODE_READ_WRITE, true);
     }
 
     /**
      * Creates an instance of a temporary file.
      * @param string $prefix
-     * @return File
+     * @return FileStream
      */
-    public static function temp(string $prefix = 'Misuzu'): File
+    public static function temp(string $prefix = 'Misuzu'): FileStream
     {
-        return new static(tempnam(sys_get_temp_dir(), $prefix));
+        return static::open(tempnam(sys_get_temp_dir(), $prefix));
     }
 
     /**
@@ -190,145 +49,4 @@ class File
 
         unlink($path);
     }
-
-    /**
-     * Closes the resource context.
-     */
-    public function close(): void
-    {
-        if (is_resource($this->resource)) {
-            fclose($this->resource);
-        }
-    }
-
-    /**
-     * Moves the position to 0.
-     */
-    public function start(): void
-    {
-        rewind($this->resource);
-        $this->updatePosition();
-    }
-
-    /**
-     * Moves the position to the end of the file.
-     */
-    public function end(): void
-    {
-        fseek($this->resource, 0, SEEK_END);
-        $this->updatePosition();
-    }
-
-    /**
-     * Sets the position.
-     * @param int $offset
-     * @param bool $relative
-     * @return int
-     */
-    public function position(int $offset, bool $relative = false): int
-    {
-        fseek($this->resource, $offset, $relative ? SEEK_CUR : SEEK_SET);
-        $this->updatePosition();
-        return $this->position;
-    }
-
-    /**
-     * Checks if the current position is the end of the file.
-     * @return bool
-     */
-    public function atEOF(): bool
-    {
-        return feof($this->resource);
-    }
-
-    /**
-     * Tries to find the position of a string in the context.
-     * @param string $string
-     * @return int
-     */
-    public function find(string $string): int
-    {
-        while ($this->position < $this->size) {
-            $find = strpos($this->read(8192), $string);
-
-            if ($find !== false) {
-                return $find + $this->position;
-            }
-
-            $this->position($this->position + 8192);
-        }
-
-        return -1;
-    }
-
-    /**
-     * Locks the file and reads from it.
-     * @param int $length
-     * @throws IOException
-     * @return string
-     */
-    public function read(int $length = null): string
-    {
-        if ($length === null) {
-            $length = $this->size;
-            $this->start();
-        }
-
-        flock($this->resource, LOCK_SH);
-        $data = fread($this->resource, $length);
-        flock($this->resource, LOCK_UN);
-
-        if ($data === false) {
-            throw new IOException('Read failed.');
-        }
-
-        $this->updateMetaData();
-
-        return $data;
-    }
-
-    /**
-     * Gets the character at the current position.
-     * @return string
-     */
-    public function char(): string
-    {
-        return fgetc($this->resource);
-    }
-
-    /**
-     * Locks the file, writes to the stream and flushes to file.
-     * @param string $data
-     * @param int $length
-     * @throws IOException
-     */
-    public function write(string $data, int $length = 0): void
-    {
-        if ($length > 0) {
-            $length = strlen($data);
-        }
-
-        flock($this->resource, LOCK_EX);
-        $write = fwrite($this->resource, $data, $length);
-        $flush = fflush($this->resource);
-        flock($this->resource, LOCK_UN);
-
-        if ($write === false || $flush === false) {
-            throw new IOException('Write failed.');
-        }
-
-        $this->updateMetaData();
-        $this->updatePosition();
-    }
-
-    /**
-     * The same as write except it moves to the end of the file first.
-     * @param string $data
-     * @param int $length
-     */
-    public function append(string $data, int $length = 0): void
-    {
-        $this->end();
-        $this->write($data, $length);
-    }
 }
diff --git a/src/IO/FileStream.php b/src/IO/FileStream.php
new file mode 100644
index 00000000..da3645e6
--- /dev/null
+++ b/src/IO/FileStream.php
@@ -0,0 +1,252 @@
+<?php
+namespace Misuzu\IO;
+
+use ErrorException;
+
+class FileStream extends Stream
+{
+    public const MODE_READ = 0x1;
+    public const MODE_WRITE = 0x2;
+    public const MODE_READ_WRITE = self::MODE_READ | self::MODE_WRITE;
+    private const MODE_TRUNCATE_RAW = 0x4;
+    public const MODE_TRUNCATE = self::MODE_TRUNCATE_RAW | self::MODE_WRITE;
+    private const MODE_APPEND_RAW = 0x8;
+    public const MODE_APPEND = self::MODE_APPEND_RAW | self::MODE_WRITE;
+
+    protected $fileHandle;
+    protected $filePath;
+    protected $fileMode;
+    protected $isLocked;
+
+    public function __construct(string $path, int $mode, bool $lock = true)
+    {
+        $this->isLocked = $lock;
+        $this->filePath = $path;
+        $this->fileMode = $mode;
+
+        try {
+            $this->fileHandle = fopen($this->filePath, static::constructFileMode($this->fileMode));
+        } catch (ErrorException $ex) {
+            throw new FileDoesNotExistException($ex->getMessage());
+        }
+
+        $this->ensureHandleActive();
+
+        if ($this->isLocked) {
+            flock($this->fileHandle, LOCK_EX | LOCK_NB);
+        }
+    }
+
+    public function __destruct()
+    {
+        if (!is_resource($this->fileHandle)) {
+            return;
+        }
+
+        $this->close();
+    }
+
+    protected static function constructFileMode(int $mode): string
+    {
+        $mode_read = ($mode & static::MODE_READ) > 0;
+        $mode_write = ($mode & static::MODE_WRITE) > 0;
+        $mode_truncate = ($mode & static::MODE_TRUNCATE_RAW) > 0;
+        $mode_append = ($mode & static::MODE_APPEND_RAW) > 0;
+
+        // why would you ever
+        if ($mode_append && $mode_truncate) {
+            throw new IOException("Can't append and truncate at the same time.");
+        }
+
+        if (($mode_append || $mode_truncate) && !$mode_write) {
+            throw new IOException("Can't append or truncate without write privileges.");
+        }
+
+        $mode_string = '';
+
+        if ($mode_append) {
+            $mode_string = 'a';
+        } elseif ($mode_truncate) {
+            $mode_string = 'w';
+        } elseif ($mode_write) {
+            $mode_string = 'c';
+        }
+
+        $mode_string .= 'b';
+
+        if ($mode_read) {
+            if (strlen($mode_string) < 2) {
+                $mode_string = 'r' . $mode_string;
+            } else {
+                $mode_string .= '+';
+            }
+        }
+
+        // should be at least two characters because of the b flag
+        if (strlen($mode_string) < 2) {
+            throw IOException('Failed to construct mode???');
+        }
+
+        return $mode_string;
+    }
+
+    public function getResource(): resource
+    {
+        $this->ensureHandleActive();
+        return $this->fileHandle;
+    }
+
+    protected function ensureHandleActive(): void
+    {
+        if (!is_resource($this->fileHandle)) {
+            throw new IOException("No active file handle.");
+        }
+    }
+
+    protected function ensureCanRead(): void
+    {
+        if (!$this->getCanRead()) {
+            throw new IOException('This stream cannot perform read operations.');
+        }
+    }
+
+    protected function ensureCanWrite(): void
+    {
+        if (!$this->getCanWrite()) {
+            throw new IOException('This stream cannot perform write operations.');
+        }
+    }
+
+    protected function ensureCanSeek(): void
+    {
+        if (!$this->getCanSeek()) {
+            throw new IOException('This stream cannot perform seek operations.');
+        }
+    }
+
+    protected function getCanRead(): bool
+    {
+        return ($this->fileMode & static::MODE_READ) > 0 && is_readable($this->filePath);
+    }
+
+    protected function getCanSeek(): bool
+    {
+        return ($this->fileMode & static::MODE_APPEND_RAW) == 0 && $this->getCanRead();
+    }
+
+    protected function getCanTimeout(): bool
+    {
+        return false;
+    }
+
+    protected function getCanWrite(): bool
+    {
+        return ($this->fileMode & static::MODE_WRITE) > 0 && is_writable($this->filePath);
+    }
+
+    protected function getLength(): int
+    {
+        $this->ensureHandleActive();
+        return fstat($this->fileHandle)['size'];
+    }
+
+    protected function getPosition(): int
+    {
+        $this->ensureHandleActive();
+        return ftell($this->fileHandle);
+    }
+
+    protected function getReadTimeout(): int
+    {
+        return -1;
+    }
+
+    protected function getWriteTimeout(): int
+    {
+        return -1;
+    }
+
+    public function flush(): void
+    {
+        $this->ensureHandleActive();
+        fflush($this->fileHandle);
+    }
+
+    public function close(): void
+    {
+        $this->ensureHandleActive();
+
+        if ($this->isLocked) {
+            flock($this->fileHandle, LOCK_UN | LOCK_NB);
+        }
+
+        fclose($this->fileHandle);
+    }
+
+    public function read(int $length): string
+    {
+        $this->ensureHandleActive();
+        $this->ensureCanRead();
+
+        $read = fread($this->fileHandle, $length);
+
+        if ($read === false) {
+            throw new IOException('Read failed.');
+        }
+
+        return $read;
+    }
+
+    public function readChar(): int
+    {
+        $this->ensureHandleActive();
+        return ord(fgetc($this->fileHandle));
+    }
+
+    public function write(string $data): int
+    {
+        $this->ensureHandleActive();
+        $this->ensureCanWrite();
+
+        $write = fwrite($this->fileHandle, $data);
+
+        if ($write === false) {
+            throw new IOException('Write failed.');
+        }
+
+        return $write;
+    }
+
+    public function writeChar(int $char): void
+    {
+        $this->ensureHandleActive();
+        $this->write(chr($char), 0, 1);
+    }
+
+    public function seek(int $offset, int $origin): void
+    {
+        $this->ensureHandleActive();
+        $this->ensureCanSeek();
+
+        switch ($origin) {
+            case Stream::ORIGIN_BEGIN:
+                $origin = SEEK_SET;
+                break;
+
+            case Stream::ORIGIN_END:
+                $origin = SEEK_END;
+                break;
+
+            case Stream::ORIGIN_CURRENT:
+                $origin = SEEK_CUR;
+                break;
+
+            default:
+                throw new IOException('Invalid seek origin.');
+        }
+
+        if (fseek($this->fileHandle, $offset, $origin) !== 0) {
+            throw new IOException('Seek operation failed.');
+        }
+    }
+}
diff --git a/src/IO/Stream.php b/src/IO/Stream.php
new file mode 100644
index 00000000..c64ee76c
--- /dev/null
+++ b/src/IO/Stream.php
@@ -0,0 +1,40 @@
+<?php
+namespace Misuzu\IO;
+
+abstract class Stream
+{
+    public const ORIGIN_CURRENT = 0;
+    public const ORIGIN_BEGIN = 1;
+    public const ORIGIN_END = 2;
+
+    public function __get(string $name)
+    {
+        $name = 'get' . ucfirst($name);
+
+        if (method_exists(static::class, $name)) {
+            return $this->{$name}();
+        }
+
+        // todo: specialised exception type
+        throw new IOException('Invalid property.');
+    }
+
+    abstract protected function getCanRead(): bool;
+    abstract protected function getCanSeek(): bool;
+    abstract protected function getCanTimeout(): bool;
+    abstract protected function getCanWrite(): bool;
+    abstract protected function getLength(): int;
+    abstract protected function getPosition(): int;
+    abstract protected function getReadTimeout(): int;
+    abstract protected function getWriteTimeout(): int;
+
+    abstract public function flush(): void;
+    abstract public function close(): void;
+    abstract public function seek(int $offset, int $origin): void;
+
+    abstract public function read(int $length): string;
+    abstract public function readChar(): int;
+
+    abstract public function write(string $data): int;
+    abstract public function writeChar(int $char): void;
+}
diff --git a/src/Zalgo.php b/src/Zalgo.php
index 7604a4b5..db686288 100644
--- a/src/Zalgo.php
+++ b/src/Zalgo.php
@@ -40,9 +40,9 @@ class Zalgo
     public const ZALGO_MODE_MAX = 3;
 
     private const ZALGO_MODES = [
-        ZALGO_MODE_MINI,
-        ZALGO_MODE_NORMAL,
-        ZALGO_MODE_MAX,
+        self::ZALGO_MODE_MINI,
+        self::ZALGO_MODE_NORMAL,
+        self::ZALGO_MODE_MAX,
     ];
 
     public const ZALGO_DIR_UP = 0x1;
@@ -105,7 +105,7 @@ class Zalgo
             }
 
             $str .= $char;
-                
+
             switch ($mode) {
                 case self::ZALGO_MODE_MINI:
                     $num_up     = mt_rand(0, 8);
@@ -129,9 +129,11 @@ class Zalgo
             if ($going_up) {
                 $str .= self::getZalgo(self::ZALGO_CHARS_UP, $num_up);
             }
+
             if ($going_mid) {
                 $str .= self::getZalgo(self::ZALGO_CHARS_MIDDLE, $num_mid);
             }
+
             if ($going_down) {
                 $str .= self::getZalgo(self::ZALGO_CHARS_DOWN, $num_down);
             }
diff --git a/tests/FileSystemTest.php b/tests/FileSystemTest.php
index 31a2e756..e4d3b177 100644
--- a/tests/FileSystemTest.php
+++ b/tests/FileSystemTest.php
@@ -4,6 +4,7 @@ namespace MisuzuTests;
 use PHPUnit\Framework\TestCase;
 use Misuzu\IO\Directory;
 use Misuzu\IO\File;
+use Misuzu\IO\FileStream;
 
 define('WORKING_DIR', sys_get_temp_dir() . '/MisuzuFileSystemTest' . time());
 
@@ -34,48 +35,48 @@ class FileSystemTest extends TestCase
 
     public function testCreateFile()
     {
-        $file = new File(WORKING_DIR . '/file', File::CREATE_READ_WRITE);
-        $this->assertInstanceOf(File::class, $file);
+        $file = File::open(WORKING_DIR . '/file');
+        $this->assertInstanceOf(FileStream::class, $file);
         $file->close();
     }
 
     public function testWriteFile()
     {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_WRITE);
-        $this->assertInstanceOf(File::class, $file);
+        $file = new FileStream(WORKING_DIR . '/file', FileStream::MODE_TRUNCATE, false);
+        $this->assertInstanceOf(FileStream::class, $file);
 
         $file->write('misuzu');
-        $this->assertEquals(6, $file->size);
+        $this->assertEquals(6, $file->length);
 
         $file->close();
     }
 
     public function testAppendFile()
     {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_WRITE);
-        $this->assertInstanceOf(File::class, $file);
+        $file = new FileStream(WORKING_DIR . '/file', FileStream::MODE_APPEND);
+        $this->assertInstanceOf(FileStream::class, $file);
 
-        $file->append(' test');
-        $this->assertEquals(11, $file->size);
+        $file->write(' test');
+        $this->assertEquals(11, $file->length);
 
         $file->close();
     }
 
     public function testPosition()
     {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_READ);
-        $this->assertInstanceOf(File::class, $file);
+        $file = new FileStream(WORKING_DIR . '/file', FileStream::MODE_READ);
+        $this->assertInstanceOf(FileStream::class, $file);
 
-        $file->start();
+        $file->seek(0, FileStream::ORIGIN_BEGIN);
         $this->assertEquals(0, $file->position);
 
-        $file->end();
-        $this->assertEquals($file->size, $file->position);
+        $file->seek(0, FileStream::ORIGIN_END);
+        $this->assertEquals($file->length, $file->position);
 
-        $file->position(4);
+        $file->seek(4, FileStream::ORIGIN_BEGIN);
         $this->assertEquals(4, $file->position);
 
-        $file->position(4, true);
+        $file->seek(4, FileStream::ORIGIN_CURRENT);
         $this->assertEquals(8, $file->position);
 
         $file->close();
@@ -83,34 +84,24 @@ class FileSystemTest extends TestCase
 
     public function testRead()
     {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_READ);
-        $this->assertInstanceOf(File::class, $file);
+        $file = new FileStream(WORKING_DIR . '/file', FileStream::MODE_READ);
+        $this->assertInstanceOf(FileStream::class, $file);
 
-        $this->assertEquals('misuzu test', $file->read());
+        $this->assertEquals('misuzu test', $file->read($file->length));
 
-        $file->position(7);
-        $this->assertEquals('test', $file->read());
-
-        $file->close();
-    }
-
-    public function testFind()
-    {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_READ);
-        $this->assertInstanceOf(File::class, $file);
-
-        $this->assertEquals(7, $file->find('test'));
+        $file->seek(7, FileStream::ORIGIN_BEGIN);
+        $this->assertEquals('test', $file->read(4));
 
         $file->close();
     }
 
     public function testChar()
     {
-        $file = new File(WORKING_DIR . '/file', File::OPEN_READ);
-        $this->assertInstanceOf(File::class, $file);
+        $file = new FileStream(WORKING_DIR . '/file', FileStream::MODE_READ);
+        $this->assertInstanceOf(FileStream::class, $file);
 
-        $file->position(3);
-        $this->assertEquals('s', $file->char());
+        $file->seek(3, FileStream::ORIGIN_BEGIN);
+        $this->assertEquals(ord('u'), $file->readChar());
 
         $file->close();
     }
diff --git a/tests/ZalgoTest.php b/tests/ZalgoTest.php
index 8e07fd1d..c3eff2d6 100644
--- a/tests/ZalgoTest.php
+++ b/tests/ZalgoTest.php
@@ -10,8 +10,19 @@ class ZalgoTest extends TestCase
 
     public function testStrip()
     {
-        $this->assertEquals(TEST_STRING, Zalgo::strip(Zalgo::run(TEST_STRING, Zalgo::ZALGO_MODE_MINI)));
-        $this->assertEquals(TEST_STRING, Zalgo::strip(Zalgo::run(TEST_STRING, Zalgo::ZALGO_MODE_NORMAL)));
-        $this->assertEquals(TEST_STRING, Zalgo::strip(Zalgo::run(TEST_STRING, Zalgo::ZALGO_MODE_MAX)));
+        $this->assertEquals(
+            static::TEST_STRING,
+            Zalgo::strip(Zalgo::run(static::TEST_STRING, Zalgo::ZALGO_MODE_MINI))
+        );
+
+        $this->assertEquals(
+            static::TEST_STRING,
+            Zalgo::strip(Zalgo::run(static::TEST_STRING, Zalgo::ZALGO_MODE_NORMAL))
+        );
+
+        $this->assertEquals(
+            static::TEST_STRING,
+            Zalgo::strip(Zalgo::run(static::TEST_STRING, Zalgo::ZALGO_MODE_MAX))
+        );
     }
 }