src/main/java/org/nustaq/serialization/coders/FSTStreamDecoder.java
@Override
    public String readStringAsc() throws IOException {
        int len = readFInt();
        if (ascStringCache == null || ascStringCache.length < len)
            ascStringCache = new byte[len];
        input.ensureReadAhead(len);
        System.arraycopy(input.buf, input.pos, ascStringCache, 0, len);
        input.pos += len;
        return new String(ascStringCache, 0, 0, len);
    }
@Override
    public String readStringAsc() throws IOException {
        int len = readFInt();
        if (ascStringCache == null || ascStringCache.length < len)
            ascStringCache = new byte[len];
        input.ensureReadAhead(len);
        System.arraycopy(input.buf, input.pos, ascStringCache, 0, len);
        input.pos += len;
        return new String(ascStringCache, 0, 0, len);
    }
len < 127 !!!!!

@return
@throws java.io.IOException