package it.cavallium.dbengine.utils; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import java.nio.charset.StandardCharsets; public class UTFUtils { public static void writeUTF(DataOutput out, String utf) throws IOException { byte[] bytes = utf.getBytes(StandardCharsets.UTF_8); out.writeInt(bytes.length); out.write(bytes); } public static String readUTF(DataInput in) throws IOException { int len = in.readInt(); byte[] data = new byte[len]; in.readFully(data, 0, len); return new String(data, StandardCharsets.UTF_8); } /** * Keep only ascii alphanumeric letters */ public static String keepOnlyASCII(String nextString) { char[] chars = nextString.toCharArray(); //noinspection UnusedAssignment nextString = null; int writeIndex = 0; char c; for (int checkIndex = 0; checkIndex < chars.length; checkIndex++) { c = chars[checkIndex]; if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) { if (writeIndex != checkIndex) { chars[writeIndex] = c; } writeIndex++; } } return new String(chars, 0, writeIndex); } }