Method bytesToString

java/org/apache/tomcat/util/http/Method.java:89–177

Provides optimised conversion from bytes to Strings for known HTTP methods. The bytes are assumed to be an ISO-8859-1 encoded representation of an HTTP method. The method is not validated as being a token, but only valid HTTP method names will be returned. Doing it this way is ~10x faster than u

(byte[] buf, int start, int len)

     * @return The HTTP method as a String or {@code null} if the method is not recognised.
     */
    public static String bytesToString(byte[] buf, int start, int len) {
        switch (buf[start]) {
            case 'G': {
                if (len == 3 && buf[start + 1] == 'E' && buf[start + 2] == 'T') {
                    return GET;
                }
                break;
            }
            case 'P': {
                if (len == 4 && buf[start + 1] == 'O' && buf[start + 2] == 'S' && buf[start + 3] == 'T') {
                    return POST;
                } else if (len == 3 && buf[start + 1] == 'U' && buf[start + 2] == 'T') {
                    return PUT;
                } else if (len == 5 && buf[start + 1] == 'A' && buf[start + 2] == 'T' && buf[start + 3] == 'C' &&
                        buf[start + 4] == 'H') {
                    return PATCH;
                } else if (len == 8 && buf[start + 1] == 'R' && buf[start + 2] == 'O' && buf[start + 3] == 'P' &&
                        buf[start + 4] == 'F' && buf[start + 5] == 'I' && buf[start + 6] == 'N' &&
                        buf[start + 7] == 'D') {
                    return PROPFIND;
                } else if (len == 9 && buf[start + 1] == 'R' && buf[start + 2] == 'O' && buf[start + 3] == 'P' &&
                        buf[start + 4] == 'P' && buf[start + 5] == 'A' && buf[start + 6] == 'T' &&
                        buf[start + 7] == 'C' && buf[start + 8] == 'H') {
                    return PROPPATCH;
                }
                break;
            }
            case 'H': {
                if (len == 4 && buf[start + 1] == 'E' && buf[start + 2] == 'A' && buf[start + 3] == 'D') {
                    return HEAD;
                }
                break;
            }
            case 'O': {
                if (len == 7 && buf[start + 1] == 'P' && buf[start + 2] == 'T' && buf[start + 3] == 'I' &&
                        buf[start + 4] == 'O' && buf[start + 5] == 'N' && buf[start + 6] == 'S') {
                    return OPTIONS;
                }
                break;
            }
            case 'D': {
                if (len == 6 && buf[start + 1] == 'E' && buf[start + 2] == 'L' && buf[start + 3] == 'E' &&
                        buf[start + 4] == 'T' && buf[start + 5] == 'E') {
                    return DELETE;
                }
                break;
            }
            case 'T': {
                if (len == 5 && buf[start + 1] == 'R' && buf[start + 2] == 'A' && buf[start + 3] == 'C' &&
                        buf[start + 4] == 'E') {
                    return TRACE;
                }
                break;
            }
            case 'M': {
                if (len == 5 && buf[start + 1] == 'K' && buf[start + 2] == 'C' && buf[start + 3] == 'O' &&
                        buf[start + 4] == 'L') {
                    return MKCOL;