static final int getCharsFromUtf8()

in datasketches-memory-java8/src/main/java/org/apache/datasketches/memory/internal/Utf8.java [58:87]

• 22 lines of code
• 6 McCabe index (conditional complexity)

  static final int getCharsFromUtf8(final long offsetBytes, final int utf8LengthBytes,
      final Appendable dst, final long cumBaseOffset, final Object unsafeObj)
          throws IOException, Utf8CodingException {

    if ((dst instanceof CharBuffer) && ((CharBuffer) dst).hasArray()) {
      return getCharBufferCharsFromUtf8(offsetBytes, ((CharBuffer) dst), utf8LengthBytes,
          cumBaseOffset, unsafeObj);
    }

    //Decode Direct CharBuffers and all other Appendables

    final long address = cumBaseOffset + offsetBytes;
    // Optimize for 100% ASCII (Hotspot loves small simple top-level loops like this).
    // This simple loop stops when we encounter a byte >= 0x80 (i.e. non-ASCII).
    // Need to keep this loop int-indexed, because it's faster for Hotspot JIT, it doesn't insert
    // savepoint polls on each iteration.
    int i = 0;
    for (; i < utf8LengthBytes; i++) {
      final byte b = unsafe.getByte(unsafeObj, address + i);
      if (!DecodeUtil.isOneByte(b)) {
        break;
      }
      dst.append((char) b);
    }
    if (i == utf8LengthBytes) {
      return i;
    }
    return getNonAsciiCharsFromUtf8(dst, address + i, address + utf8LengthBytes, unsafeObj,
        cumBaseOffset) + i;
  }