| 1 | // -*- mode: cpp; mode: fold -*- |
| 2 | // Description /*{{{*/ |
| 3 | // $Id: gzip.cc,v 1.17.2.1 2004/01/16 18:58:50 mdz Exp $ |
| 4 | /* ###################################################################### |
| 5 | |
| 6 | GZip method - Take a file URI in and decompress it into the target |
| 7 | file. |
| 8 | |
| 9 | ##################################################################### */ |
| 10 | /*}}}*/ |
| 11 | // Include Files /*{{{*/ |
| 12 | #include <config.h> |
| 13 | |
| 14 | #include <apt-pkg/configuration.h> |
| 15 | #include <apt-pkg/acquire-method.h> |
| 16 | #include <apt-pkg/error.h> |
| 17 | #include <apt-pkg/fileutl.h> |
| 18 | #include <apt-pkg/hashes.h> |
| 19 | #include <apt-pkg/strutl.h> |
| 20 | #include <apt-pkg/aptconfiguration.h> |
| 21 | |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/time.h> |
| 25 | #include <string> |
| 26 | #include <vector> |
| 27 | |
| 28 | #include <apti18n.h> |
| 29 | /*}}}*/ |
| 30 | |
| 31 | const char *Prog; |
| 32 | |
| 33 | class GzipMethod : public pkgAcqMethod |
| 34 | { |
| 35 | virtual bool Fetch(FetchItem *Itm); |
| 36 | |
| 37 | public: |
| 38 | |
| 39 | GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {}; |
| 40 | }; |
| 41 | |
| 42 | |
| 43 | // GzipMethod::Fetch - Decompress the passed URI /*{{{*/ |
| 44 | // --------------------------------------------------------------------- |
| 45 | /* */ |
| 46 | bool GzipMethod::Fetch(FetchItem *Itm) |
| 47 | { |
| 48 | URI Get = Itm->Uri; |
| 49 | std::string Path = Get.Host + Get.Path; // To account for relative paths |
| 50 | |
| 51 | FetchResult Res; |
| 52 | Res.Filename = Itm->DestFile; |
| 53 | URIStart(Res); |
| 54 | |
| 55 | std::vector<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors(); |
| 56 | std::vector<APT::Configuration::Compressor>::const_iterator compressor = compressors.begin(); |
| 57 | for (; compressor != compressors.end(); ++compressor) |
| 58 | if (compressor->Name == Prog) |
| 59 | break; |
| 60 | if (compressor == compressors.end()) |
| 61 | return _error->Error("Extraction of file %s requires unknown compressor %s", Path.c_str(), Prog); |
| 62 | |
| 63 | // Open the source and destination files |
| 64 | FileFd From, To; |
| 65 | if (_config->FindB("Method::Compress", false) == false) |
| 66 | { |
| 67 | From.Open(Path, FileFd::ReadOnly, *compressor); |
| 68 | if(From.FileSize() == 0) |
| 69 | return _error->Error(_("Empty files can't be valid archives")); |
| 70 | To.Open(Itm->DestFile, FileFd::WriteAtomic); |
| 71 | } |
| 72 | else |
| 73 | { |
| 74 | From.Open(Path, FileFd::ReadOnly); |
| 75 | To.Open(Itm->DestFile, FileFd::WriteOnly | FileFd::Create | FileFd::Empty, *compressor); |
| 76 | } |
| 77 | To.EraseOnFailure(); |
| 78 | |
| 79 | if (From.IsOpen() == false || From.Failed() == true || |
| 80 | To.IsOpen() == false || To.Failed() == true) |
| 81 | return false; |
| 82 | |
| 83 | // Read data from source, generate checksums and write |
| 84 | Hashes Hash; |
| 85 | bool Failed = false; |
| 86 | while (1) |
| 87 | { |
| 88 | unsigned char Buffer[4*1024]; |
| 89 | unsigned long long Count = 0; |
| 90 | |
| 91 | if (!From.Read(Buffer,sizeof(Buffer),&Count)) |
| 92 | { |
| 93 | To.OpFail(); |
| 94 | return false; |
| 95 | } |
| 96 | if (Count == 0) |
| 97 | break; |
| 98 | |
| 99 | Hash.Add(Buffer,Count); |
| 100 | if (To.Write(Buffer,Count) == false) |
| 101 | { |
| 102 | Failed = true; |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | From.Close(); |
| 108 | Res.Size = To.FileSize(); |
| 109 | To.Close(); |
| 110 | |
| 111 | if (Failed == true) |
| 112 | return false; |
| 113 | |
| 114 | // Transfer the modification times |
| 115 | struct stat Buf; |
| 116 | if (stat(Path.c_str(),&Buf) != 0) |
| 117 | return _error->Errno("stat",_("Failed to stat")); |
| 118 | |
| 119 | struct timeval times[2]; |
| 120 | times[0].tv_sec = Buf.st_atime; |
| 121 | Res.LastModified = times[1].tv_sec = Buf.st_mtime; |
| 122 | times[0].tv_usec = times[1].tv_usec = 0; |
| 123 | if (utimes(Itm->DestFile.c_str(), times) != 0) |
| 124 | return _error->Errno("utimes",_("Failed to set modification time")); |
| 125 | |
| 126 | // Return a Done response |
| 127 | Res.TakeHashes(Hash); |
| 128 | |
| 129 | URIDone(Res); |
| 130 | return true; |
| 131 | } |
| 132 | /*}}}*/ |
| 133 | |
| 134 | int main(int, char *argv[]) |
| 135 | { |
| 136 | setlocale(LC_ALL, ""); |
| 137 | |
| 138 | Prog = strrchr(argv[0],'/'); |
| 139 | ++Prog; |
| 140 | |
| 141 | GzipMethod Mth; |
| 142 | |
| 143 | Mth.DropPrivsOrDie(); |
| 144 | |
| 145 | return Mth.Run(); |
| 146 | } |