*/
internal object DnsRecordCodec {
  private const val SERVFAIL = 2
  private const val NXDOMAIN = 3
  const val TYPE_A = 0x0001
  const val TYPE_AAAA = 0x001c
  private const val TYPE_PTR = 0x000c
  private val ASCII = Charsets.US_ASCII

  fun encodeQuery(
    host: String,
    type: Int,
  ): ByteString =
    Buffer()
      .apply {
        writeShort(0) // query id
        writeShort(256) // flags with recursion

 */
package okhttp3.internal.http2

import okio.ByteString
import okio.ByteString.Companion.encodeUtf8

/** HTTP header: the name is an ASCII string, but the value can be UTF-8. */
data class Header(
  /** Name in case-insensitive ASCII encoding. */
  @JvmField val name: ByteString,
  /** Value in UTF-8 encoding. */
  @JvmField val value: ByteString,
) {

    assertThat(xmlEscaper.escape("<tab>")).isEqualTo("&lt;tab&gt;");

    // Test all non-escaped ASCII characters.
    String s =
        "!@#$%^*()_+=-/?\\|]}[{,.;:"
            + "abcdefghijklmnopqrstuvwxyz"
            + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            + "1234567890";
    assertThat(xmlEscaper.escape(s)).isEqualTo(s);

    // Test ASCII control characters.
    for (char ch = 0; ch < 0x20; ch++) {

// trailing white space, as defined by Unicode.
func TrimSpace(s []byte) []byte {
	// Fast path for ASCII: look for the first ASCII non-space byte.
	for lo, c := range s {
		if c >= utf8.RuneSelf {
			// If we run into a non-ASCII byte, fall back to the
			// slower unicode-aware method on the remaining bytes.
			return TrimFunc(s[lo:], unicode.IsSpace)
		}

   * (<code>'&#92;u002D'</code>) is recognized as the minus sign.
   *
   * <p>Unlike {@link Integer#parseInt(String)}, this method returns {@code null} instead of
   * throwing an exception if parsing fails. Additionally, this method only accepts ASCII digits,
   * and returns {@code null} if non-ASCII digits are present in the string.
   *

      try {
        return Integer.decode(userFriendly);
      } catch (NumberFormatException ignored) {
        if (userFriendly.matches("(?i)(?:American|English|ASCII)")) {
          // 1-byte UTF-8 sequences - "American" ASCII text
          return 0x80;
        } else if (userFriendly.matches("(?i)(?:French|Latin|Western.*European)")) {
          // Mostly 1-byte UTF-8 sequences, mixed with occasional 2-byte

        // Verify subcommand
        assertEquals(SmbComTransaction.NET_SERVER_ENUM2 & 0xFF, (dst[0] & 0xFF) | ((dst[1] & 0xFF) << 8));

        // Verify description
        byte[] descr = NetServerEnum2.DESCR[0].getBytes("ASCII");
        byte[] writtenDescr = new byte[descr.length];
        System.arraycopy(dst, 2, writtenDescr, 0, descr.length);
        assertArrayEquals(descr, writtenDescr);

        int currentIndex = 2 + descr.length;

        int state, t, x, i, off;
        byte ch;
        final byte[] type = new byte[128];
        final byte[] buf = new byte[16];
        final byte[] ext = extension.toLowerCase().getBytes("ASCII");

        state = ST_START;
        t = x = i = 0;
        for (off = 0; off < inLen; off++) {
            ch = in[off];
            switch (state) {
            case ST_START:

    @Override
    String normalizeWord(String word) {
      return Ascii.toUpperCase(word);
    }

    @Override
    String convert(CaseFormat format, String s) {
      if (format == LOWER_HYPHEN) {
        return Ascii.toLowerCase(s.replace('_', '-'));
      }
      if (format == LOWER_UNDERSCORE) {
        return Ascii.toLowerCase(s);
      }
      return super.convert(format, s);
    }
  };

        try {
            service = new String(buffer, bufferIndex, len, "ASCII");
        } catch (final UnsupportedEncodingException uee) {
            return 0;
        }
        bufferIndex += len + 1;
        // win98 observed not returning nativeFileSystem
        /* Problems here with iSeries returning ASCII even though useUnicode = true
         * Fortunately we don't really need nativeFileSystem for anything.