//	-a-1 == ^a
		//
		// If the number is negative, we use an inversion mask to invert the
		// data bytes and treat the value as an unsigned number.
		var inv byte // 0x00 if positive or zero, 0xff if negative
		if b[0]&0x40 != 0 {
			inv = 0xff
		}

		var x uint64
		for i, c := range b {
			c ^= inv // Inverts c only if inv is 0xff, otherwise does nothing
			if i == 0 {

        assertEquals(1L, crawlerContext.getAccessCount());

        assertEquals(0L, crawlerContext.decrementAndGetAccessCount());
        assertEquals(0L, crawlerContext.getAccessCount());

        // Test decrement below zero
        assertEquals(-1L, crawlerContext.decrementAndGetAccessCount());
        assertEquals(-1L, crawlerContext.getAccessCount());
    }

    /**
     * Test concurrent access count operations
     */

	uploadID, _, _, _, s3Error := getObjectResources(r.Form)
	if s3Error != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
		return
	}

	// Content-Length is required and should be non-zero
	if r.ContentLength <= 0 {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrMissingPart), r.URL)
		return
	}

	complMultipartUpload := &CompleteMultipartUpload{}

	if !opts.NoAuditLog {
		auditObjectErasureSet(ctx, "PutObjectPart", object, &er)
	}

	data := r.Reader
	// Validate input data size and it can never be less than zero.
	if data.Size() < -1 {
		bugLogIf(ctx, errInvalidArgument, logger.ErrorKind)
		return pi, toObjectErr(errInvalidArgument)
	}

	uploadIDPath := er.getUploadIDDir(bucket, object, uploadID)

		if _, _, err := rs.GetOffsetLength(objInfo.Size); err != nil {
			// Make sure to return object info to provide extra information.
			return &GetObjectReader{
				ObjInfo: objInfo,
			}, err
		}

		// Zero byte objects don't even need to further initialize pipes etc.
		return NewGetObjectReaderFromReader(bytes.NewReader(nil), objInfo, opts)
	}

	if objInfo.IsRemote() {