pad(OS);
}
+// In the Ustar header, a path can be split at any '/' to store
+// a path into UstarHeader::Name and UstarHeader::Prefix. This
+// function splits a given path for that purpose.
+static std::pair<StringRef, StringRef> splitPath(StringRef Path) {
+ if (Path.size() <= sizeof(UstarHeader::Name))
+ return {"", Path};
+ size_t Sep = Path.rfind('/', sizeof(UstarHeader::Name) + 1);
+ if (Sep == StringRef::npos)
+ return {"", Path};
+ return {Path.substr(0, Sep), Path.substr(Sep + 1)};
+}
+
+// Returns true if a given path can be stored to a Ustar header
+// without the PAX extension.
+static bool fitInUstar(StringRef Path) {
+ StringRef Prefix;
+ StringRef Name;
+ std::tie(Prefix, Name) = splitPath(Path);
+ return Name.size() <= sizeof(UstarHeader::Name);
+}
+
// The PAX header is an extended format, so a PAX header needs
// to be followed by a "real" header.
static void writeUstarHeader(raw_fd_ostream &OS, StringRef Path, size_t Size) {
+ StringRef Prefix;
+ StringRef Name;
+ std::tie(Prefix, Name) = splitPath(Path);
+
UstarHeader Hdr = {};
- memcpy(Hdr.Name, Path.data(), Path.size());
+ memcpy(Hdr.Name, Name.data(), Name.size());
memcpy(Hdr.Mode, "0000664", 8);
snprintf(Hdr.Size, sizeof(Hdr.Size), "%011zo", Size);
memcpy(Hdr.Magic, "ustar", 6);
+ memcpy(Hdr.Prefix, Prefix.data(), Prefix.size());
computeChecksum(Hdr);
OS << StringRef(reinterpret_cast<char *>(&Hdr), sizeof(Hdr));
}