// From section 13.2.3 of RFC2616, we compute the current age of a cached
// response as follows:
//
// currentAge = max(max(0, responseTime - dateValue), ageValue)
// + now - requestTime
//
// where responseTime == now
//
// This is typically a very small number.
//
nsresult
nsHttpResponseHead::ComputeCurrentAge(uint32_t now,
uint32_t requestTime,
uint32_t *result) const
{
uint32_t dateValue;
uint32_t ageValue;
*result = 0;
if (NS_FAILED(GetDateValue(&dateValue))) {
LOG(("nsHttpResponseHead::ComputeCurrentAge [this=%p] "
"Date response header not set!\n", this));
// Assume we have a fast connection and that our clock
// is in sync with the server.
dateValue = now;
}
// Compute apparent age
if (now > dateValue)
*result = now - dateValue;
// Compute corrected received age
if (NS_SUCCEEDED(GetAgeValue(&ageValue)))
*result = std::max(*result, ageValue);
MOZ_ASSERT(now >= requestTime, "bogus request time");
// Compute current age
*result += (now - requestTime);
return NS_OK;
}
// From section 13.2.3 of RFC2616, we compute the current age of a cached
// response as follows:
//
// currentAge = max(max(0, responseTime - dateValue), ageValue)
// + now - requestTime
//
// where responseTime == now
//
// This is typically a very small number.
//
nsresult
nsHttpResponseHead::ComputeCurrentAge(PRUint32 now,
PRUint32 requestTime,
PRUint32 *result)
{
PRUint32 dateValue;
PRUint32 ageValue;
*result = 0;
if (NS_FAILED(GetDateValue(&dateValue))) {
LOG(("nsHttpResponseHead::ComputeCurrentAge [this=%x] "
"Date response header not set!\n", this));
// Assume we have a fast connection and that our clock
// is in sync with the server.
dateValue = now;
}
// Compute apparent age
if (now > dateValue)
*result = now - dateValue;
// Compute corrected received age
if (NS_SUCCEEDED(GetAgeValue(&ageValue)))
*result = PR_MAX(*result, ageValue);
NS_ASSERTION(now >= requestTime, "bogus request time");
// Compute current age
*result += (now - requestTime);
return NS_OK;
}
