keyConditionStr, contentLengthCondStr, algorithmConditionStr, dateConditionStr, credentialConditionStr, uuidConditionStr)
	retStr := "{"
	retStr = retStr + expirationStr + ","
	retStr += conditionStr
	retStr += "}"

	return []byte(retStr)
}

// newPostPolicyBytesV4 - creates a bare bones postpolicy string with key and bucket matches.

// Returns 0 if there are no more pointers available.
//
// This prefers non-conservative pointers so we scan stack objects
// precisely if there are any non-conservative pointers to them.
func (s *stackScanState) getPtr() (p uintptr, conservative bool) {
	for _, head := range []**stackWorkBuf{&s.buf, &s.cbuf} {
		buf := *head
		if buf == nil {
			// Never had any data.
			continue
		}
		if buf.nobj == 0 {