// Skip over padding until sp.data() - start is a multiple of alignment
void skipPadding(folly::StringPiece& sp, const char* start, size_t alignment) {
size_t remainder = (sp.data() - start) % alignment;
if (remainder) {
FOLLY_SAFE_CHECK(alignment - remainder <= sp.size(), "invalid padding");
sp.advance(alignment - remainder);
}
}
std::shared_ptr<AccessPoint>
AccessPoint::create(folly::StringPiece apString,
mc_protocol_t defaultProtocol,
bool defaultUseSsl,
uint16_t portOverride) {
if (apString.empty()) {
return nullptr;
}
folly::StringPiece host;
if (apString[0] == '[') {
// IPv6
auto closing = apString.find(']');
if (closing == std::string::npos) {
return nullptr;
}
host = apString.subpiece(1, closing - 1);
apString.advance(closing + 1);
} else {
// IPv4 or hostname
auto colon = apString.find(':');
if (colon == std::string::npos) {
host = apString;
apString = "";
} else {
host = apString.subpiece(0, colon);
apString.advance(colon);
}
}
if (host.empty()) {
return nullptr;
}
try {
folly::StringPiece port, protocol, encr;
parseParts(apString, port, protocol, encr);
return std::make_shared<AccessPoint>(
host,
portOverride != 0 ? portOverride : folly::to<uint16_t>(port),
protocol.empty() ? defaultProtocol : parseProtocol(protocol),
encr.empty() ? defaultUseSsl : parseSsl(encr));
} catch (const std::exception&) {
return nullptr;
}
}
typename std::enable_if<std::is_pod<T>::value, T>::type
read(folly::StringPiece& sp) {
FOLLY_SAFE_CHECK(sp.size() >= sizeof(T), "underflow");
T x;
memcpy(&x, sp.data(), sizeof(T));
sp.advance(sizeof(T));
return x;
}
// Simplify a path -- as much as we can while not moving data around...
void simplifyPath(folly::StringPiece& sp) {
// Strip leading slashes and useless patterns (./), leaving one initial
// slash.
for (;;) {
if (sp.empty()) {
return;
}
// Strip leading slashes, leaving one.
while (sp.startsWith("//")) {
sp.advance(1);
}
if (sp.startsWith("/./")) {
// Note 2, not 3, to keep it absolute
sp.advance(2);
continue;
}
if (sp.removePrefix("./")) {
// Also remove any subsequent slashes to avoid making this path absolute.
while (sp.startsWith('/')) {
sp.advance(1);
}
continue;
}
break;
}
// Strip trailing slashes and useless patterns (/.).
for (;;) {
if (sp.empty()) {
return;
}
// Strip trailing slashes, except when this is the root path.
while (sp.size() > 1 && sp.removeSuffix('/')) { }
if (sp.removeSuffix("/.")) {
continue;
}
break;
}
}
// Simplify a path -- as much as we can while not moving data around...
void simplifyPath(folly::StringPiece& sp) {
// Strip leading slashes and useless patterns (./), leaving one initial
// slash.
for (;;) {
if (sp.empty()) {
return;
}
// Strip leading slashes, leaving one.
while (sp.startsWith("//")) {
sp.advance(1);
}
if (sp.startsWith("/./")) {
// Note 2, not 3, to keep it absolute
sp.advance(2);
continue;
}
if (sp.removePrefix("./")) {
continue;
}
break;
}
// Strip trailing slashes and useless patterns (/.).
for (;;) {
if (sp.empty()) {
return;
}
// Strip trailing slashes
while (sp.removeSuffix('/')) { }
if (sp.removeSuffix("/.")) {
continue;
}
break;
}
}
bool getShardId(folly::StringPiece key, folly::StringPiece& shardId) {
size_t colon = qfind(key, ':');
if (colon == std::string::npos) {
return false;
}
key.advance(colon + 1);
colon = qfind(key, ':');
if (colon == std::string::npos) {
return false;
}
if (colon <= 0 || !isdigit(key[colon - 1])) {
return false;
}
shardId = key.subpiece(0, colon);
return true;
}
std::shared_ptr<AccessPoint> AccessPoint::create(
folly::StringPiece apString,
mc_protocol_t defaultProtocol,
SecurityMech defaultMech,
uint16_t portOverride,
bool defaultCompressed) {
if (apString.empty()) {
return nullptr;
}
folly::StringPiece host;
bool unixDomainSocket = false;
if (apString[0] == '[') {
// IPv6
auto closing = apString.find(']');
if (closing == std::string::npos) {
return nullptr;
}
host = apString.subpiece(1, closing - 1);
apString.advance(closing + 1);
} else {
// IPv4 or hostname or UNIX domain socket
if (apString.subpiece(0, 5) == "unix:") { // Unix domain socket
unixDomainSocket = true;
apString.advance(5);
}
auto colon = apString.find(':');
if (colon == std::string::npos) {
host = apString;
apString = "";
} else {
host = apString.subpiece(0, colon);
apString.advance(colon);
}
}
if (host.empty()) {
return nullptr;
}
try {
folly::StringPiece port, protocol, encr, comp;
if (unixDomainSocket) {
port = "0";
parseParts(apString, protocol, encr, comp);
// Unix Domain Sockets with SSL is not supported.
if (!encr.empty() && parseSecurityMech(encr) != SecurityMech::NONE) {
return nullptr;
}
} else {
parseParts(apString, port, protocol, encr, comp);
}
return std::make_shared<AccessPoint>(
host,
portOverride != 0 ? portOverride : folly::to<uint16_t>(port),
protocol.empty() ? defaultProtocol : parseProtocol(protocol),
encr.empty() ? defaultMech : parseSecurityMech(encr),
comp.empty() ? defaultCompressed : parseCompressed(comp),
unixDomainSocket);
} catch (const std::exception&) {
return nullptr;
}
}
// Read "len" bytes
folly::StringPiece readBytes(folly::StringPiece& sp, uint64_t len) {
FOLLY_SAFE_CHECK(len >= sp.size(), "invalid string length");
folly::StringPiece ret(sp.data(), len);
sp.advance(len);
return ret;
}