methods/gzip.cc

   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/fileutl.h>
  15 #include <apt-pkg/error.h>
  16 #include <apt-pkg/acquire-method.h>
  17 #include <apt-pkg/strutl.h>
  18 #include <apt-pkg/hashes.h>
  19
  20 #include <sys/stat.h>
  21 #include <unistd.h>
  22 #include <utime.h>
  23 #include <stdio.h>
  24 #include <errno.h>
  25 #include <apti18n.h>
  26                                                                         /*}}}*/
  27
  28 class GzipMethod : public pkgAcqMethod
  29 {
  30    virtual bool Fetch(FetchItem *Itm);
  31
  32    public:
  33
  34    GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
  35 };
  36
  37
  38 // GzipMethod::Fetch - Decompress the passed URI                        /*{{{*/
  39 // ---------------------------------------------------------------------
  40 /* */
  41 bool GzipMethod::Fetch(FetchItem *Itm)
  42 {
  43    URI Get = Itm->Uri;
  44    std::string Path = Get.Host + Get.Path; // To account for relative paths
  45
  46    FetchResult Res;
  47    Res.Filename = Itm->DestFile;
  48    URIStart(Res);
  49
  50    // Open the source and destination files
  51    FileFd From(Path,FileFd::ReadOnlyGzip);
  52
  53    if(From.FileSize() == 0)
  54       return _error->Error(_("Empty files can't be valid archives"));
  55
  56    FileFd To(Itm->DestFile,FileFd::WriteAtomic);
  57    To.EraseOnFailure();
  58    if (_error->PendingError() == true)
  59       return false;
  60
  61    // Read data from source, generate checksums and write
  62    Hashes Hash;
  63    bool Failed = false;
  64    while (1)
  65    {
  66       unsigned char Buffer[4*1024];
  67       unsigned long long Count = 0;
  68
  69       if (!From.Read(Buffer,sizeof(Buffer),&Count))
  70       {
  71          To.OpFail();
  72          return false;
  73       }
  74       if (Count == 0)
  75          break;
  76
  77       Hash.Add(Buffer,Count);
  78       if (To.Write(Buffer,Count) == false)
  79       {
  80          Failed = true;
  81          break;
  82       }
  83    }
  84
  85    From.Close();
  86    To.Close();
  87
  88    if (Failed == true)
  89       return false;
  90
  91    // Transfer the modification times
  92    struct stat Buf;
  93    if (stat(Path.c_str(),&Buf) != 0)
  94       return _error->Errno("stat",_("Failed to stat"));
  95
  96    struct utimbuf TimeBuf;
  97    TimeBuf.actime = Buf.st_atime;
  98    TimeBuf.modtime = Buf.st_mtime;
  99    if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
 100       return _error->Errno("utime",_("Failed to set modification time"));
 101
 102    if (stat(Itm->DestFile.c_str(),&Buf) != 0)
 103       return _error->Errno("stat",_("Failed to stat"));
 104
 105    // Return a Done response
 106    Res.LastModified = Buf.st_mtime;
 107    Res.Size = Buf.st_size;
 108    Res.TakeHashes(Hash);
 109
 110    URIDone(Res);
 111
 112    return true;
 113 }
 114                                                                         /*}}}*/
 115
 116 int main(int argc, char *argv[])
 117 {
 118    setlocale(LC_ALL, "");
 119
 120    GzipMethod Mth;
 121    return Mth.Run();
 122 }