From b09663668c4d8203543e56b25db822ba55d21529 Mon Sep 17 00:00:00 2001
From: David Kalnischkies <kalnischkies@gmail.com>
Date: Sun, 11 Jul 2010 21:57:51 +0200
Subject: * methods/bzip2.cc:   - add a copycat of the old gzip.cc as we need
 it for bzip2 and lzma

---
 methods/bzip2.cc | 177 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 177 insertions(+)
 create mode 100644 methods/bzip2.cc

(limited to 'methods/bzip2.cc')

diff --git a/methods/bzip2.cc b/methods/bzip2.cc
new file mode 100644
index 000000000..5da214bfc
--- /dev/null
+++ b/methods/bzip2.cc
@@ -0,0 +1,177 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/* ######################################################################
+
+   Bzip2 method - Take a file URI in and decompress it into the target 
+   file.
+
+   While the method is named "bzip2" it handles also other compression
+   types as it calls binaries based on the name of the method,
+   so it can also be used to handle gzip, lzma and others if named
+   correctly.
+
+   ##################################################################### */
+									/*}}}*/
+// Include Files							/*{{{*/
+#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 Bzip2Method : public pkgAcqMethod
+{
+   virtual bool Fetch(FetchItem *Itm);
+   
+   public:
+   
+   Bzip2Method() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
+};
+
+
+// Bzip2Method::Fetch - Decompress the passed URI			/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool Bzip2Method::Fetch(FetchItem *Itm)
+{
+   URI Get = Itm->Uri;
+   string Path = Get.Host + Get.Path; // To account for relative paths
+   
+   string GzPathOption = "Dir::bin::"+string(Prog);
+
+   FetchResult Res;
+   Res.Filename = Itm->DestFile;
+   URIStart(Res);
+   
+   // Open the source and destination files
+   FileFd From(Path,FileFd::ReadOnly);
+
+   // if the file is empty, just rename it and return
+   if(From.Size() == 0) 
+   {
+      rename(Path.c_str(), Itm->DestFile.c_str());
+      return true;
+   }
+
+   int GzOut[2];   
+   if (pipe(GzOut) < 0)
+      return _error->Errno("pipe",_("Couldn't open pipe for %s"),Prog);
+
+   // Fork bzip2
+   pid_t Process = ExecFork();
+   if (Process == 0)
+   {
+      close(GzOut[0]);
+      dup2(From.Fd(),STDIN_FILENO);
+      dup2(GzOut[1],STDOUT_FILENO);
+      From.Close();
+      close(GzOut[1]);
+      SetCloseExec(STDIN_FILENO,false);
+      SetCloseExec(STDOUT_FILENO,false);
+      
+      const char *Args[3];
+      string Tmp = _config->Find(GzPathOption,Prog);
+      Args[0] = Tmp.c_str();
+      Args[1] = "-d";
+      Args[2] = 0;
+      execvp(Args[0],(char **)Args);
+      _exit(100);
+   }
+   From.Close();
+   close(GzOut[1]);
+   
+   FileFd FromGz(GzOut[0]);  // For autoclose   
+   FileFd To(Itm->DestFile,FileFd::WriteEmpty);   
+   To.EraseOnFailure();
+   if (_error->PendingError() == true)
+      return false;
+   
+   // Read data from bzip2, generate checksums and write
+   Hashes Hash;
+   bool Failed = false;
+   while (1) 
+   {
+      unsigned char Buffer[4*1024];
+      unsigned long Count;
+      
+      Count = read(GzOut[0],Buffer,sizeof(Buffer));
+      if (Count < 0 && errno == EINTR)
+	 continue;
+      
+      if (Count < 0)
+      {
+	 _error->Errno("read", _("Read error from %s process"),Prog);
+	 Failed = true;
+	 break;
+      }
+      
+      if (Count == 0)
+	 break;
+      
+      Hash.Add(Buffer,Count);
+      if (To.Write(Buffer,Count) == false)
+      {
+	 Failed = true;
+	 FromGz.Close();
+	 break;
+      }      
+   }
+   
+   // Wait for bzip2 to finish
+   if (ExecWait(Process,_config->Find(GzPathOption,Prog).c_str(),false) == false)
+   {
+      To.OpFail();
+      return false;
+   }  
+       
+   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, "");
+
+   Bzip2Method Mth;
+
+   Prog = strrchr(argv[0],'/');
+   Prog++;
+   
+   return Mth.Run();
+}
-- 
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