// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: gzip.cc,v 1.17.2.1 2004/01/16 18:58:50 mdz Exp $ /* ###################################################################### GZip method - Take a file URI in and decompress it into the target file. ##################################################################### */ /*}}}*/ // Include Files /*{{{*/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include /*}}}*/ const char *Prog; class GzipMethod : public pkgAcqMethod { virtual bool Fetch(FetchItem *Itm) APT_OVERRIDE; virtual bool Configuration(std::string Message) APT_OVERRIDE; public: GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {}; }; bool GzipMethod::Configuration(std::string Message) { if (pkgAcqMethod::Configuration(Message) == false) return false; DropPrivsOrDie(); return true; } // GzipMethod::Fetch - Decompress the passed URI /*{{{*/ // --------------------------------------------------------------------- /* */ bool GzipMethod::Fetch(FetchItem *Itm) { URI Get = Itm->Uri; std::string Path = Get.Host + Get.Path; // To account for relative paths FetchResult Res; Res.Filename = Itm->DestFile; URIStart(Res); std::vector const compressors = APT::Configuration::getCompressors(); std::vector::const_iterator compressor = compressors.begin(); for (; compressor != compressors.end(); ++compressor) if (compressor->Name == Prog) break; if (compressor == compressors.end()) return _error->Error("Extraction of file %s requires unknown compressor %s", Path.c_str(), Prog); // Open the source and destination files FileFd From; if (_config->FindB("Method::Compress", false) == false) { From.Open(Path, FileFd::ReadOnly, *compressor); if(From.FileSize() == 0) return _error->Error(_("Empty files can't be valid archives")); } else From.Open(Path, FileFd::ReadOnly); if (From.IsOpen() == false || From.Failed() == true) return false; FileFd To; if (Itm->DestFile != "/dev/null") { if (_config->FindB("Method::Compress", false) == false) To.Open(Itm->DestFile, FileFd::WriteAtomic); else To.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty, *compressor); if (To.IsOpen() == false || To.Failed() == true) return false; To.EraseOnFailure(); } // Read data from source, generate checksums and write Hashes Hash(Itm->ExpectedHashes); bool Failed = false; Res.Size = 0; while (1) { unsigned char Buffer[4*1024]; unsigned long long Count = 0; if (!From.Read(Buffer,sizeof(Buffer),&Count)) { if (To.IsOpen()) To.OpFail(); return false; } if (Count == 0) break; Res.Size += Count; Hash.Add(Buffer,Count); if (To.IsOpen() && To.Write(Buffer,Count) == false) { Failed = true; break; } } From.Close(); To.Close(); if (Failed == true) return false; // Transfer the modification times if (Itm->DestFile != "/dev/null") { struct stat Buf; if (stat(Path.c_str(),&Buf) != 0) return _error->Errno("stat",_("Failed to stat")); struct timeval times[2]; times[0].tv_sec = Buf.st_atime; Res.LastModified = times[1].tv_sec = Buf.st_mtime; times[0].tv_usec = times[1].tv_usec = 0; if (utimes(Itm->DestFile.c_str(), times) != 0) return _error->Errno("utimes",_("Failed to set modification time")); } // Return a Done response Res.TakeHashes(Hash); URIDone(Res); return true; } /*}}}*/ int main(int, char *argv[]) { setlocale(LC_ALL, ""); Prog = strrchr(argv[0],'/'); ++Prog; GzipMethod Mth; return Mth.Run(); }