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// -*- 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 <config.h>
#include <apt-pkg/fileutl.h>
#include <apt-pkg/error.h>
#include <apt-pkg/acquire-method.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/hashes.h>
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include <stdio.h>
#include <errno.h>
#include <apti18n.h>
/*}}}*/
const char *Prog;
class GzipMethod : public pkgAcqMethod
{
virtual bool Fetch(FetchItem *Itm);
public:
GzipMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
};
// 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<APT::Configuration::Compressor> const compressors = APT::Configuration::getCompressors();
std::vector<APT::Configuration::Compressor>::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;
From.Open(Path, FileFd::ReadOnly, *compressor);
if(From.FileSize() == 0)
return _error->Error(_("Empty files can't be valid archives"));
FileFd To(Itm->DestFile,FileFd::WriteAtomic);
To.EraseOnFailure();
if (_error->PendingError() == true)
return false;
// Read data from source, generate checksums and write
Hashes Hash;
bool Failed = false;
while (1)
{
unsigned char Buffer[4*1024];
unsigned long long Count = 0;
if (!From.Read(Buffer,sizeof(Buffer),&Count))
{
To.OpFail();
return false;
}
if (Count == 0)
break;
Hash.Add(Buffer,Count);
if (To.Write(Buffer,Count) == false)
{
Failed = true;
break;
}
}
From.Close();
To.Close();
if (Failed == true)
return false;
// Transfer the modification times
struct stat Buf;
if (stat(Path.c_str(),&Buf) != 0)
return _error->Errno("stat",_("Failed to stat"));
struct utimbuf TimeBuf;
TimeBuf.actime = Buf.st_atime;
TimeBuf.modtime = Buf.st_mtime;
if (utime(Itm->DestFile.c_str(),&TimeBuf) != 0)
return _error->Errno("utime",_("Failed to set modification time"));
if (stat(Itm->DestFile.c_str(),&Buf) != 0)
return _error->Errno("stat",_("Failed to stat"));
// Return a Done response
Res.LastModified = Buf.st_mtime;
Res.Size = Buf.st_size;
Res.TakeHashes(Hash);
URIDone(Res);
return true;
}
/*}}}*/
int main(int argc, char *argv[])
{
setlocale(LC_ALL, "");
Prog = strrchr(argv[0],'/');
++Prog;
GzipMethod Mth;
return Mth.Run();
}
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