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import org.xiph.system.Bytes;
import flash.Vector;
class System {
/*
* Note: modifies .position of both src and dst!
*/
public static inline function
bytescopy(src : Bytes, src_pos : Int,
dst : Bytes, dst_pos : Int, length : Int) : Void {
src.position = src_pos;
if (src == dst && dst_pos > src_pos) {
var tmp : Bytes = new Bytes();
tmp.length = length;
src.readBytes(tmp, 0, length);
tmp.position = 0;
tmp.readBytes(dst, dst_pos, length);
} else {
src.readBytes(dst, dst_pos, length);
}
}
/*
* That one, though a tiny bit faster, doesn't handle overlapping if:
* - src and dst are the same object, and
* - dst_pos > src_pos
*/
public static inline function
unsafe_bytescopy(src : Bytes, src_pos : Int,
dst : Bytes, dst_pos : Int, length : Int) : Void {
src.position = src_pos;
src.readBytes(dst, dst_pos, length);
}
public static inline function
fromString(str : String) : Bytes {
var b = new Bytes();
b.writeUTFBytes(str);
b.position = 0;
return b;
}
public static inline function
fromBytes(b : Bytes, start : Int, length : Int) : String {
b.position = start;
return b.readUTFBytes(length);
}
public static function
alloc(size : Int) : Bytes {
var b = new Bytes();
b.length = size;
b[size - 1] = 0;
b.position = 0;
return b;
}
public static inline function
resize(b : Bytes, new_size : Int) : Void {
b.length = new_size;
// do we need to do: "b[new_size - 1] = 0" (even if only when growing)?
}
public static inline function
abs(n : Int) : Int {
return n < 0 ? -n : n;
}
public static inline function
max(a : Int, b : Int) : Int {
return a > b ? a : b;
}
public static function
floatToIntBits(value : Float) : Int {
var b : Bytes = new Bytes();
b.writeFloat(value);
b.position = 0;
var i : Int = b.readInt();
return i;
}
public static function
intBitsToFloat(value : Int) : Float {
var b : Bytes = new Bytes();
b.writeInt(value);
b.position = 0;
var f : Float = b.readFloat();
return f;
}
}
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