Bytes.hx

/*
 * Copyright (C)2005-2018 Haxe Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

package haxe.io;

#if (!hl && !js && !eval)
#if cpp
using cpp.NativeArray;
#end

#if !macro
@:autoBuild(lime._internal.macros.AssetsMacro.embedBytes()) // Enable @:bytes embed metadata
#end
#if !lime_debug
@:fileXml('tags="haxe,release"')
@:noDebug
#end
class Bytes
{
	public var length(default, null):Int;

	var b:BytesData;

	function new(length, b)
	{
		this.length = length;
		this.b = b;
		#if flash
		b.endian = flash.utils.Endian.LITTLE_ENDIAN;
		#end
	}

	public inline function get(pos:Int):Int
	{
		#if neko
		return untyped $sget(b, pos);
		#elseif flash
		return b[pos];
		#elseif (cpp || webassembly)
		return untyped b[pos];
		#elseif java
		return untyped b[pos] & 0xFF;
		#elseif python
		return python.Syntax.arrayAccess(b, pos);
		#else
		return b[pos];
		#end
	}

	public inline function set(pos:Int, v:Int):Void
	{
		#if neko
		untyped $sset(b, pos, v);
		#elseif flash
		b[pos] = v;
		#elseif (cpp || webassembly)
		untyped b[pos] = v;
		#elseif java
		b[pos] = cast v;
		#elseif cs
		b[pos] = cast v;
		#elseif python
		python.Syntax.arraySet(b, pos, v & 0xFF);
		#else
		b[pos] = v & 0xFF;
		#end
	}

	public function blit(pos:Int, src:Bytes, srcpos:Int, len:Int):Void
	{
		#if !neko
		if (pos < 0 || srcpos < 0 || len < 0 || pos + len > length || srcpos + len > src.length) throw Error.OutsideBounds;
		#end
		#if neko
		try
			untyped $sblit(b, pos, src.b, srcpos, len)
		catch (e:Dynamic)
			throw Error.OutsideBounds;
		#elseif flash
		b.position = pos;
		if (len > 0) b.writeBytes(src.b, srcpos, len);
		#elseif java
		java.lang.System.arraycopy(src.b, srcpos, b, pos, len);
		#elseif cs
		cs.system.Array.Copy(src.b, srcpos, b, pos, len);
		#elseif python
		python.Syntax.code("self.b[{0}:{0}+{1}] = src.b[srcpos:srcpos+{1}]", pos, len);
		#elseif (cpp || webassembly)
		b.blit(pos, src.b, srcpos, len);
		#else
		var b1 = b;
		var b2 = src.b;
		if (b1 == b2 && pos > srcpos)
		{
			var i = len;
			while (i > 0)
			{
				i--;
				b1[i + pos] = b2[i + srcpos];
			}
			return;
		}
		for (i in 0...len)
			b1[i + pos] = b2[i + srcpos];
		#end
	}

	public function fill(pos:Int, len:Int, value:Int)
	{
		#if flash
		var v4 = value & 0xFF;
		v4 |= v4 << 8;
		v4 |= v4 << 16;
		b.position = pos;
		for (i in 0...len >> 2)
			b.writeUnsignedInt(v4);
		pos += len & ~3;
		for (i in 0...len & 3)
			set(pos++, value);
		#elseif (cpp || webassembly)
		untyped __global__.__hxcpp_memory_memset(b, pos, len, value);
		#else
		for (i in 0...len)
			set(pos++, value);
		#end
	}

	public function sub(pos:Int, len:Int):Bytes
	{
		#if !neko
		if (pos < 0 || len < 0 || pos + len > length) throw Error.OutsideBounds;
		#end
		#if neko
		return try new Bytes(len, untyped __dollar__ssub(b, pos, len))
		catch (e:Dynamic) throw Error.OutsideBounds;
		#elseif flash
		b.position = pos;
		var b2 = new flash.utils.ByteArray();
		b.readBytes(b2, 0, len);
		return new Bytes(len, b2);
		#elseif java
		var newarr = new java.NativeArray(len);
		java.lang.System.arraycopy(b, pos, newarr, 0, len);
		return new Bytes(len, newarr);
		#elseif cs
		var newarr = new cs.NativeArray(len);
		cs.system.Array.Copy(b, pos, newarr, 0, len);
		return new Bytes(len, newarr);
		#elseif python
		return new Bytes(len, python.Syntax.arrayAccess(b, pos, pos + len));
		#else
		return new Bytes(len, b.slice(pos, pos + len));
		#end
	}

	public function compare(other:Bytes):Int
	{
		#if neko
		return untyped __dollar__compare(b, other.b);
		#elseif flash
		var len = (length < other.length) ? length : other.length;
		var b1 = b;
		var b2 = other.b;
		b1.position = 0;
		b2.position = 0;
		b1.endian = flash.utils.Endian.BIG_ENDIAN;
		b2.endian = flash.utils.Endian.BIG_ENDIAN;
		for (i in 0...len >> 2)
			if (b1.readUnsignedInt() != b2.readUnsignedInt())
			{
				b1.position -= 4;
				b2.position -= 4;
				var d = b1.readUnsignedInt() - b2.readUnsignedInt();
				b1.endian = flash.utils.Endian.LITTLE_ENDIAN;
				b2.endian = flash.utils.Endian.LITTLE_ENDIAN;
				return d;
			}
		for (i in 0...len & 3)
			if (b1.readUnsignedByte() != b2.readUnsignedByte())
			{
				b1.endian = flash.utils.Endian.LITTLE_ENDIAN;
				b2.endian = flash.utils.Endian.LITTLE_ENDIAN;
				return b1[b1.position - 1] - b2[b2.position - 1];
			}
		b1.endian = flash.utils.Endian.LITTLE_ENDIAN;
		b2.endian = flash.utils.Endian.LITTLE_ENDIAN;
		return length - other.length;
		// #elseif cs
		// TODO: memcmp if unsafe flag is on
		#elseif (cpp || webassembly)
		return b.memcmp(other.b);
		#else
		var b1 = b;
		var b2 = other.b;
		var len = (length < other.length) ? length : other.length;
		for (i in 0...len)
			if (b1[i] != b2[i]) return untyped b1[i] - untyped b2[i];
		return length - other.length;
		#end
	}

	/**
		Returns the IEEE double precision value at given position (in low endian encoding).
		Result is unspecified if reading outside of the bounds
	**/
	#if (neko_v21 || (cpp && !cppia) || flash)
	inline
	#end
	public function getDouble(pos:Int):Float
	{
		#if neko_v21
		return untyped $sgetd(b, pos, false);
		#elseif flash
		b.position = pos;
		return b.readDouble();
		#elseif (cpp || webassembly)
		if (pos < 0 || pos + 8 > length) throw Error.OutsideBounds;
		return untyped __global__.__hxcpp_memory_get_double(b, pos);
		#else
		return FPHelper.i64ToDouble(getInt32(pos), getInt32(pos + 4));
		#end
	}

	/**
		Returns the IEEE single precision value at given position (in low endian encoding).
		Result is unspecified if reading outside of the bounds
	**/
	#if (neko_v21 || (cpp && !cppia) || flash)
	inline
	#end
	public function getFloat(pos:Int):Float
	{
		#if neko_v21
		return untyped $sgetf(b, pos, false);
		#elseif flash
		b.position = pos;
		return b.readFloat();
		#elseif (cpp || webassembly)
		if (pos < 0 || pos + 4 > length) throw Error.OutsideBounds;
		return untyped __global__.__hxcpp_memory_get_float(b, pos);
		#else
		return FPHelper.i32ToFloat(getInt32(pos));
		#end
	}

	/**
		Store the IEEE double precision value at given position in low endian encoding.
		Result is unspecified if writing outside of the bounds.
	**/
	#if (neko_v21 || flash)
	inline
	#end
	public function setDouble(pos:Int, v:Float):Void
	{
		#if neko_v21
		untyped $ssetd(b, pos, v, false);
		#elseif neko
		untyped $sblit(b, pos, FPHelper._double_bytes(v, false), 0, 8);
		#elseif flash
		b.position = pos;
		b.writeDouble(v);
		#elseif (cpp || webassembly)
		if (pos < 0 || pos + 8 > length) throw Error.OutsideBounds;
		untyped __global__.__hxcpp_memory_set_double(b, pos, v);
		#else
		var i = FPHelper.doubleToI64(v);
		setInt32(pos, i.low);
		setInt32(pos + 4, i.high);
		#end
	}

	/**
		Store the IEEE single precision value at given position in low endian encoding.
		Result is unspecified if writing outside of the bounds.
	**/
	#if (neko_v21 || flash)
	inline
	#end
	public function setFloat(pos:Int, v:Float):Void
	{
		#if neko_v21
		untyped $ssetf(b, pos, v, false);
		#elseif neko
		untyped $sblit(b, pos, FPHelper._float_bytes(v, false), 0, 4);
		#elseif flash
		b.position = pos;
		b.writeFloat(v);
		#elseif (cpp || webassembly)
		if (pos < 0 || pos + 4 > length) throw Error.OutsideBounds;
		untyped __global__.__hxcpp_memory_set_float(b, pos, v);
		#else
		setInt32(pos, FPHelper.floatToI32(v));
		#end
	}

	/**
		Returns the 16 bit unsigned integer at given position (in low endian encoding).
	**/
	public inline function getUInt16(pos:Int):Int
	{
		#if neko_v21
		return untyped $sget16(b, pos, false);
		#else
		return get(pos) | (get(pos + 1) << 8);
		#end
	}

	/**
		Store the 16 bit unsigned integer at given position (in low endian encoding).
	**/
	public inline function setUInt16(pos:Int, v:Int):Void
	{
		#if neko_v21
		untyped $sset16(b, pos, v, false);
		#else
		set(pos, v);
		set(pos + 1, v >> 8);
		#end
	}

	/**
		Returns the 32 bit integer at given position (in low endian encoding).
	**/
	public inline function getInt32(pos:Int):Int
	{
		#if neko_v21
		return untyped $sget32(b, pos, false);
		#elseif python
		var v = get(pos) | (get(pos + 1) << 8) | (get(pos + 2) << 16) | (get(pos + 3) << 24);
		return if (v & 0x80000000 != 0) v | 0x80000000 else v;
		#elseif lua
		var v = get(pos) | (get(pos + 1) << 8) | (get(pos + 2) << 16) | (get(pos + 3) << 24);
		return lua.Boot.clamp(if (v & 0x80000000 != 0) v | 0x80000000 else v);
		#else
		return get(pos) | (get(pos + 1) << 8) | (get(pos + 2) << 16) | (get(pos + 3) << 24);
		#end
	}

	/**
		Returns the 64 bit integer at given position (in low endian encoding).
	**/
	public inline function getInt64(pos:Int):haxe.Int64
	{
		return haxe.Int64.make(getInt32(pos + 4), getInt32(pos));
	}

	/**
		Store the 32 bit integer at given position (in low endian encoding).
	**/
	public inline function setInt32(pos:Int, v:Int):Void
	{
		#if neko_v21
		untyped $sset32(b, pos, v, false);
		#else
		set(pos, v & 0xFF);
		set(pos + 1, v >> 8 & 0xFF);
		set(pos + 2, v >> 16 & 0xFF);
		set(pos + 3, v >>> 24 & 0xFF);
		#end
	}

	/**
		Store the 64 bit integer at given position (in low endian encoding).
	**/
	public inline function setInt64(pos:Int, v:haxe.Int64):Void
	{
		setInt32(pos, v.low);
		setInt32(pos + 4, v.high);
	}

	public function getString(pos:Int, len:Int, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):String
	{
		#if !neko
		if (pos < 0 || len < 0 || pos + len > length) throw Error.OutsideBounds;
		#end
		#if neko
		return try new String(untyped __dollar__ssub(b, pos, len))
		catch (e:Dynamic) throw Error.OutsideBounds;
		#elseif flash
		b.position = pos;
		return b.readUTFBytes(len);
		#elseif (cpp || webassembly)
		var result:String = "";
		untyped __global__.__hxcpp_string_of_bytes(b, result, pos, len);
		return result;
		#elseif cs
		return cs.system.text.Encoding.UTF8.GetString(b, pos, len);
		#elseif java
		try
			return new String(b, pos, len, "UTF-8")
		catch (e:Dynamic)
			throw e;
		#elseif python
		return python.Syntax.code("self.b[{0}:{0}+{1}].decode('UTF-8','replace')", pos, len);
		#elseif lua
		var begin = cast(Math.min(pos, b.length), Int);
		var end = cast(Math.min(pos + len, b.length), Int);
		return [for (i in begin...end) String.fromCharCode(b[i])].join("");
		#else
		var s = "";
		var b = b;
		var fcc = String.fromCharCode;
		var i = pos;
		var max = pos + len;
		// utf8-decode and utf16-encode
		while (i < max)
		{
			var c = b[i++];
			if (c < 0x80)
			{
				if (c == 0) break;
				s += fcc(c);
			}
			else if (c < 0xE0) s += fcc(((c & 0x3F) << 6) | (b[i++] & 0x7F));
			else if (c < 0xF0)
			{
				var c2 = b[i++];
				s += fcc(((c & 0x1F) << 12) | ((c2 & 0x7F) << 6) | (b[i++] & 0x7F));
			}
			else
			{
				var c2 = b[i++];
				var c3 = b[i++];
				var u = ((c & 0x0F) << 18) | ((c2 & 0x7F) << 12) | ((c3 & 0x7F) << 6) | (b[i++] & 0x7F);
				// surrogate pair
				s += fcc((u >> 10) + 0xD7C0);
				s += fcc((u & 0x3FF) | 0xDC00);
			}
		}
		return s;
		#end
	}

	@:deprecated("readString is deprecated, use getString instead")
	@:noCompletion
	public inline function readString(pos:Int, len:Int):String
	{
		return getString(pos, len);
	}

	/**
		Returns string representation of the bytes as UTF8
	**/
	public function toString():String
	{
		#if neko
		return new String(untyped __dollar__ssub(b, 0, length));
		#elseif flash
		b.position = 0;
		return b.toString();
		#elseif cs
		return cs.system.text.Encoding.UTF8.GetString(b, 0, length);
		#elseif java
		try
		{
			return new String(b, 0, length, "UTF-8");
		}
		catch (e:Dynamic)
			throw e;
		#else
		return getString(0, length);
		#end
	}

	public function toHex():String
	{
		var s = new StringBuf();
		var chars = [];
		var str = "0123456789abcdef";
		for (i in 0...str.length)
			chars.push(str.charCodeAt(i));
		for (i in 0...length)
		{
			var c = get(i);
			s.addChar(chars[c >> 4]);
			s.addChar(chars[c & 15]);
		}
		return s.toString();
	}

	public inline function getData():BytesData
	{
		return b;
	}

	public static function alloc(length:Int):Bytes
	{
		#if neko
		return new Bytes(length, untyped __dollar__smake(length));
		#elseif flash
		var b = new flash.utils.ByteArray();
		b.length = length;
		return new Bytes(length, b);
		#elseif (cpp || webassembly)
		var a = new BytesData();
		if (length > 0) cpp.NativeArray.setSize(a, length);
		return new Bytes(length, a);
		#elseif cs
		return new Bytes(length, new cs.NativeArray(length));
		#elseif java
		return new Bytes(length, new java.NativeArray(length));
		#elseif python
		return new Bytes(length, new python.Bytearray(length));
		#else
		var a = new Array();
		for (i in 0...length)
			a.push(0);
		return new Bytes(length, a);
		#end
	}

	/**
		Returns bytes representation of the given String, using specific encoding (UTF-8 by default)
	**/
	@:pure
	public static function ofString(s:String, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):Bytes
	{
		#if neko
		return new Bytes(s.length, untyped __dollar__ssub(s.__s, 0, s.length));
		#elseif flash
		var b = new flash.utils.ByteArray();
		b.writeUTFBytes(s);
		return new Bytes(b.length, b);
		#elseif (cpp || webassembly)
		var a = new BytesData();
		untyped __global__.__hxcpp_bytes_of_string(a, s);
		return new Bytes(a.length, a);
		#elseif cs
		var b = cs.system.text.Encoding.UTF8.GetBytes(s);
		return new Bytes(b.Length, b);
		#elseif java
		try
		{
			var b:BytesData = untyped s.getBytes("UTF-8");
			return new Bytes(b.length, b);
		}
		catch (e:Dynamic)
			throw e;
		#elseif python
		var b:BytesData = new python.Bytearray(s, "UTF-8");
		return new Bytes(b.length, b);
		#elseif lua
		var bytes = [for (c in 0...s.length) StringTools.fastCodeAt(s, c)];
		return new Bytes(bytes.length, bytes);
		#else
		var a = new Array();
		// utf16-decode and utf8-encode
		var i = 0;
		while (i < s.length)
		{
			var c:Int = StringTools.fastCodeAt(s, i++);
			// surrogate pair
			if (0xD800 <= c && c <= 0xDBFF) c = (c - 0xD7C0 << 10) | (StringTools.fastCodeAt(s, i++) & 0x3FF);
			if (c <= 0x7F) a.push(c);
			else if (c <= 0x7FF)
			{
				a.push(0xC0 | (c >> 6));
				a.push(0x80 | (c & 63));
			}
			else if (c <= 0xFFFF)
			{
				a.push(0xE0 | (c >> 12));
				a.push(0x80 | ((c >> 6) & 63));
				a.push(0x80 | (c & 63));
			}
			else
			{
				a.push(0xF0 | (c >> 18));
				a.push(0x80 | ((c >> 12) & 63));
				a.push(0x80 | ((c >> 6) & 63));
				a.push(0x80 | (c & 63));
			}
		}
		return new Bytes(a.length, a);
		#end
	}

	public static function ofData(b:BytesData)
	{
		#if flash
		return new Bytes(b.length, b);
		#elseif neko
		return new Bytes(untyped __dollar__ssize(b), b);
		#elseif cs
		return new Bytes(b.Length, b);
		#else
		return new Bytes(b.length, b);
		#end
	}

	/**
		Convert hexadecimal string to Bytes.
		Support only straight hex string ( Example: "0FDA14058916052309" )
	**/
	public static function ofHex(s:String):Bytes
	{
		var len:Int = s.length;
		if ((len & 1) != 0) throw "Not a hex string (odd number of digits)";
		var ret:Bytes = Bytes.alloc(len >> 1);
		for (i in 0...ret.length)
		{
			var high = StringTools.fastCodeAt(s, i * 2);
			var low = StringTools.fastCodeAt(s, i * 2 + 1);
			high = (high & 0xF) + ((high & 0x40) >> 6) * 9;
			low = (low & 0xF) + ((low & 0x40) >> 6) * 9;
			ret.set(i, ((high << 4) | low) & 0xFF);
		}

		return ret;
	}

	/**
		Read the most efficiently possible the n-th byte of the data.
		Behavior when reading outside of the available data is unspecified.
	**/
	public inline static function fastGet(b:BytesData, pos:Int):Int
	{
		#if neko
		return untyped __dollar__sget(b, pos);
		#elseif flash
		return b[pos];
		#elseif (cpp || webassembly)
		return untyped b.unsafeGet(pos);
		#elseif java
		return untyped b[pos] & 0xFF;
		#else
		return b[pos];
		#end
	}
}
#elseif js
#if haxe4
import js.lib.Uint8Array;
import js.lib.DataView;
#else
#if !nodejs
import js.html.compat.Uint8Array;
import js.html.compat.DataView;
#end
import js.html.Uint8Array;
import js.html.DataView;
#end

#if !macro
@:autoBuild(lime._internal.macros.AssetsMacro.embedBytes()) // Enable @:bytes embed metadata
#end
class Bytes
{
	#if lime_bytes_length_getter
	public var length(get, set):Int;

	var l:Int;
	#else
	public var length(default, null):Int;
	#end

	var b:Uint8Array;
	var data:DataView;

	function new(data:BytesData)
	{
		this.length = data.byteLength;
		this.b = new Uint8Array(data);
		untyped
		{
			b.bufferValue = data; // some impl does not return the same instance in .buffer
			data.hxBytes = this;
			data.bytes = this.b;
		}
	}

	public inline function get(pos:Int):Int
	{
		return b[pos];
	}

	public inline function set(pos:Int, v:Int):Void
	{
		b[pos] = v & 0xFF; // the &0xFF is necessary for js.html.compat support
	}

	public function blit(pos:Int, src:Bytes, srcpos:Int, len:Int):Void
	{
		if (pos < 0 || srcpos < 0 || len < 0 || pos + len > length || srcpos + len > src.length) throw Error.OutsideBounds;
		if (srcpos == 0 && len == src.b.byteLength) b.set(src.b, pos);
		else
			b.set(src.b.subarray(srcpos, srcpos + len), pos);
	}

	public function fill(pos:Int, len:Int, value:Int):Void
	{
		for (i in 0...len)
			set(pos++, value);
	}

	public function sub(pos:Int, len:Int):Bytes
	{
		if (pos < 0 || len < 0 || pos + len > length) throw Error.OutsideBounds;
		return new Bytes(b.buffer.slice(pos + b.byteOffset, pos + b.byteOffset + len));
	}

	public function compare(other:Bytes):Int
	{
		var b1 = b;
		var b2 = other.b;
		var len = (length < other.length) ? length : other.length;
		for (i in 0...len)
			if (b1[i] != b2[i]) return b1[i] - b2[i];
		return length - other.length;
	}

	inline function initData():Void
	{
		if (data == null) data = new DataView(b.buffer, b.byteOffset, b.byteLength);
	}

	public function getDouble(pos:Int):Float
	{
		initData();
		return data.getFloat64(pos, true);
	}

	public function getFloat(pos:Int):Float
	{
		initData();
		return data.getFloat32(pos, true);
	}

	public function setDouble(pos:Int, v:Float):Void
	{
		initData();
		data.setFloat64(pos, v, true);
	}

	public function setFloat(pos:Int, v:Float):Void
	{
		initData();
		data.setFloat32(pos, v, true);
	}

	public function getUInt16(pos:Int):Int
	{
		initData();
		return data.getUint16(pos, true);
	}

	public function setUInt16(pos:Int, v:Int):Void
	{
		initData();
		data.setUint16(pos, v, true);
	}

	public function getInt32(pos:Int):Int
	{
		initData();
		return data.getInt32(pos, true);
	}

	public function setInt32(pos:Int, v:Int):Void
	{
		initData();
		data.setInt32(pos, v, true);
	}

	public function getInt64(pos:Int):haxe.Int64
	{
		return Int64.make(getInt32(pos + 4), getInt32(pos));
	}

	public function setInt64(pos:Int, v:haxe.Int64):Void
	{
		setInt32(pos, v.low);
		setInt32(pos + 4, v.high);
	}

	public function getString(pos:Int, len:Int, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):String
	{
		if (pos < 0 || len < 0 || pos + len > length) throw Error.OutsideBounds;
		var s = "";
		var b = b;
		var fcc = String.fromCharCode;
		var i = pos;
		var max = pos + len;
		// utf8-decode and utf16-encode
		while (i < max)
		{
			var c = b[i++];
			if (c < 0x80)
			{
				if (c == 0) break;
				s += fcc(c);
			}
			else if (c < 0xE0) s += fcc(((c & 0x3F) << 6) | (b[i++] & 0x7F));
			else if (c < 0xF0)
			{
				var c2 = b[i++];
				s += fcc(((c & 0x1F) << 12) | ((c2 & 0x7F) << 6) | (b[i++] & 0x7F));
			}
			else
			{
				var c2 = b[i++];
				var c3 = b[i++];
				var u = ((c & 0x0F) << 18) | ((c2 & 0x7F) << 12) | ((c3 & 0x7F) << 6) | (b[i++] & 0x7F);
				// surrogate pair
				s += fcc((u >> 10) + 0xD7C0);
				s += fcc((u & 0x3FF) | 0xDC00);
			}
		}
		return s;
	}

	@:deprecated("readString is deprecated, use getString instead")
	@:noCompletion
	public inline function readString(pos:Int, len:Int):String
	{
		return getString(pos, len);
	}

	public function toString():String
	{
		return getString(0, length);
	}

	public function toHex():String
	{
		var s = new StringBuf();
		var chars = [];
		var str = "0123456789abcdef";
		for (i in 0...str.length)
			chars.push(str.charCodeAt(i));
		for (i in 0...length)
		{
			var c = get(i);
			s.addChar(chars[c >> 4]);
			s.addChar(chars[c & 15]);
		}
		return s.toString();
	}

	public inline function getData():BytesData
	{
		return untyped b.bufferValue;
	}

	public static inline function alloc(length:Int):Bytes
	{
		return new Bytes(new BytesData(length));
	}

	public static function ofString(s:String, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):Bytes
	{
		var a = new Array();
		// utf16-decode and utf8-encode
		var i = 0;
		while (i < s.length)
		{
			var c:Int = StringTools.fastCodeAt(s, i++);
			// surrogate pair
			if (0xD800 <= c && c <= 0xDBFF) c = (c - 0xD7C0 << 10) | (StringTools.fastCodeAt(s, i++) & 0x3FF);
			if (c <= 0x7F) a.push(c);
			else if (c <= 0x7FF)
			{
				a.push(0xC0 | (c >> 6));
				a.push(0x80 | (c & 63));
			}
			else if (c <= 0xFFFF)
			{
				a.push(0xE0 | (c >> 12));
				a.push(0x80 | ((c >> 6) & 63));
				a.push(0x80 | (c & 63));
			}
			else
			{
				a.push(0xF0 | (c >> 18));
				a.push(0x80 | ((c >> 12) & 63));
				a.push(0x80 | ((c >> 6) & 63));
				a.push(0x80 | (c & 63));
			}
		}
		return new Bytes(new Uint8Array(a).buffer);
	}

	public static function ofData(b:BytesData):Bytes
	{
		var hb = untyped b.hxBytes;
		if (hb != null) return hb;
		return new Bytes(b);
	}

	public static function ofHex(s:String):Bytes
	{
		if ((s.length & 1) != 0) throw "Not a hex string (odd number of digits)";
		var a = new Array();
		var i = 0;
		var len = s.length >> 1;
		while (i < len)
		{
			var high = StringTools.fastCodeAt(s, i * 2);
			var low = StringTools.fastCodeAt(s, i * 2 + 1);
			high = (high & 0xF) + ((high & 0x40) >> 6) * 9;
			low = (low & 0xF) + ((low & 0x40) >> 6) * 9;
			a.push(((high << 4) | low) & 0xFF);
			i++;
		}

		return new Bytes(new Uint8Array(a).buffer);
	}

	public inline static function fastGet(b:BytesData, pos:Int):Int
	{
		// this requires that we have wrapped it with haxe.io.Bytes beforehand
		return untyped b.bytes[pos];
	}

	#if lime_bytes_length_getter
	private function get_length():Int
	{
		return l;
	}

	private function set_length(v:Int):Int
	{
		return l = v;
	}
	#end
}
#elseif hl
#if !macro
@:autoBuild(lime._internal.macros.AssetsMacro.embedBytes()) // Enable @:bytes embed metadata
#end
@:coreApi
class Bytes
{
	public var length(default, null):Int;

	var b:hl.Bytes;

	function new(b:hl.Bytes, length:Int):Void
	{
		this.b = b;
		this.length = length;
	}

	inline function out(pos:Int):Bool
	{
		return (pos : UInt) >= (length : UInt);
	}

	inline function outRange(pos:Int, len:Int):Bool
	{
		return pos < 0 || len < 0 || ((pos + len) : UInt) > (length : UInt);
	}

	public function get(pos:Int):Int
	{
		return if (out(pos)) 0 else b[pos];
	}

	public function set(pos:Int, v:Int):Void
	{
		if (out(pos)) throw Error.OutsideBounds;
		b[pos] = v;
	}

	public function blit(pos:Int, src:Bytes, srcpos:Int, len:Int):Void
	{
		if (outRange(pos, len) || src.outRange(srcpos, len)) throw Error.OutsideBounds;
		b.blit(pos, src.b, srcpos, len);
	}

	public function fill(pos:Int, len:Int, value:Int):Void
	{
		if (outRange(pos, len)) throw Error.OutsideBounds;
		b.fill(pos, len, value);
	}

	public function sub(pos:Int, len:Int):Bytes
	{
		if (outRange(pos, len)) throw Error.OutsideBounds;
		return new Bytes(b.sub(pos, len), len);
	}

	public function compare(other:Bytes):Int
	{
		var len = length < other.length ? length : other.length;
		var r = b.compare(0, other.b, 0, len);
		if (r == 0) r = length - other.length;
		return r;
	}

	public function getDouble(pos:Int):Float
	{
		return if (out(pos + 7)) 0.
		else
			b.getF64(pos);
	}

	public function getFloat(pos:Int):Float
	{
		return if (out(pos + 3)) 0.
		else
			b.getF32(pos);
	}

	public function setDouble(pos:Int, v:Float):Void
	{
		if (out(pos + 7)) throw Error.OutsideBounds;
		b.setF64(pos, v);
	}

	public function setFloat(pos:Int, v:Float):Void
	{
		if (out(pos + 3)) throw Error.OutsideBounds;
		b.setF32(pos, v);
	}

	public inline function getUInt16(pos:Int):Int
	{
		return if (out(pos + 1)) 0 else b.getUI16(pos);
	}

	public inline function setUInt16(pos:Int, v:Int):Void
	{
		if (out(pos + 1)) throw Error.OutsideBounds;
		b.setUI16(pos, v);
	}

	public function getInt32(pos:Int):Int
	{
		return if (out(pos + 3)) 0 else b.getI32(pos);
	}

	public function getInt64(pos:Int):haxe.Int64
	{
		if (out(pos + 7)) return haxe.Int64.ofInt(0);
		return haxe.Int64.make(b.getI32(pos + 4), b.getI32(pos));
	}

	public function setInt32(pos:Int, v:Int):Void
	{
		if (out(pos + 3)) throw Error.OutsideBounds;
		b.setI32(pos, v);
	}

	public inline function setInt64(pos:Int, v:haxe.Int64):Void
	{
		setInt32(pos + 4, v.high);
		setInt32(pos, v.low);
	}

	public function getString(pos:Int, len:Int #if (!hl || haxe_ver >= 4), ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end #end):String
	{
		if (outRange(pos, len)) throw Error.OutsideBounds;

		var b = new hl.Bytes(len + 1);
		b.blit(0, this.b, pos, len);
		b[len] = 0;
		return @:privateAccess String.fromUTF8(b);
	}

	@:deprecated("readString is deprecated, use getString instead")
	@:noCompletion
	public inline function readString(pos:Int, len:Int):String
	{
		return getString(pos, len);
	}

	public function toString():String
	{
		return getString(0, length);
	}

	public function toHex():String
	{
		var s = new StringBuf();
		var chars = [];
		var str = "0123456789abcdef";
		for (i in 0...str.length)
			chars.push(str.charCodeAt(i));
		for (i in 0...length)
		{
			var c = get(i);
			s.addChar(chars[c >> 4]);
			s.addChar(chars[c & 15]);
		}
		return s.toString();
	}

	public inline function getData():BytesData
	{
		return new haxe.io.BytesData(b, length);
	}

	public static function alloc(length:Int):Bytes
	{
		var b = new hl.Bytes(length);
		b.fill(0, length, 0);
		return new Bytes(b, length);
	}

	public static function ofString(s:String
			#if (!hl || haxe_ver >= 4), ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end #end):Bytes @:privateAccess {
		var size = 0;
		var b = s.bytes.utf16ToUtf8(0, size);
		return new Bytes(b, size);
	}

	public static function ofData(b:BytesData):Bytes
	{
		return new Bytes(b.bytes, b.length);
	}

	#if (!hl || haxe_ver >= 4)
	public static function ofHex(s:String):Bytes
	{
		var len = s.length;
		if ((len & 1) != 0) throw "Not a hex string (odd number of digits)";
		var l = len >> 1;
		var b = new hl.Bytes(l);
		for (i in 0...l)
		{
			var high = s.charCodeAt(i * 2);
			var low = s.charCodeAt(i * 2 + 1);
			high = (high & 0xf) + ((high & 0x40) >> 6) * 9;
			low = (low & 0xf) + ((low & 0x40) >> 6) * 9;
			b.setUI8(i, ((high << 4) | low) & 0xff);
		}

		return new Bytes(b, l);
	}
	#end

	public inline static function fastGet(b:BytesData, pos:Int):Int
	{
		return b[pos];
	}
}
#elseif eval
extern class Bytes
{
	function new(length:Int, b:BytesData):Void;
	public var length(default, null):Int;
	public function get(pos:Int):Int;
	public function set(pos:Int, v:Int):Void;
	public function blit(pos:Int, src:Bytes, srcpos:Int, len:Int):Void;
	public function fill(pos:Int, len:Int, value:Int):Void;
	public function sub(pos:Int, len:Int):Bytes;
	public function compare(other:Bytes):Int;
	public function getDouble(pos:Int):Float;
	public function getFloat(pos:Int):Float;
	public function setDouble(pos:Int, v:Float):Void;
	public function setFloat(pos:Int, v:Float):Void;
	public function getUInt16(pos:Int):Int;
	public function setUInt16(pos:Int, v:Int):Void;
	public function getInt32(pos:Int):Int;
	public function getInt64(pos:Int):haxe.Int64;
	public function setInt32(pos:Int, v:Int):Void;
	public function setInt64(pos:Int, v:haxe.Int64):Void;
	public function getString(pos:Int, len:Int, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):String;
	public function toString():String;
	public function toHex():String;
	public function getData():BytesData;
	public static function alloc(length:Int):Bytes;
	@:pure
	public static function ofString(s:String, ?encoding:#if (haxe_ver >= 4) haxe.io.Encoding #else Dynamic #end):Bytes;
	public static function ofData(b:BytesData):Bytes;
	public static function ofHex(s:String):Bytes;
	public static function fastGet(b:BytesData, pos:Int):Int;
	static function __init__():Void
	{
		haxe.io.Error;
	}
}
#end