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[ntk/apt.git] / ftparchive / multicompress.h

diff --git a/ftparchive/multicompress.h b/ftparchive/multicompress.h
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+// -*- mode: cpp; mode: fold -*-
+// Description                                                         /*{{{*/
+// $Id: multicompress.h,v 1.2 2001/02/20 07:03:18 jgg Exp $
+/* ######################################################################
+
+   MultiCompressor
+   
+   Multiple output class. Takes a single FILE* and writes it simultaneously
+   to many compressed files. Then checks if the resulting output is 
+   different from any previous output and overwrites the old files. Care is
+   taken to ensure that the new files are not generally readable while they
+   are being written.
+   
+   ##################################################################### */
+                                                                       /*}}}*/
+#ifndef MULTICOMPRESS_H
+#define MULTICOMPRESS_H
+
+#ifdef __GNUG__
+#pragma interface "multicompress.h"
+#endif 
+
+#include <string>
+#include <apt-pkg/fileutl.h>
+#include <stdio.h>
+#include <sys/types.h>
+    
+class MultiCompress
+{
+   // Enumeration of all supported compressors
+   struct CompType
+   {
+      const char *Name;
+      const char *Extension;
+      const char *Binary;
+      const char *CompArgs;
+      const char *UnCompArgs;
+      unsigned char Cost;
+   };
+
+   // An output file
+   struct Files
+   {
+      string Output;
+      const CompType *CompressProg;
+      Files *Next;      
+      FileFd TmpFile;
+      pid_t CompressProc;
+      time_t OldMTime;
+      int Fd;
+   };
+   
+   Files *Outputs;
+   pid_t Outputter;
+   mode_t Permissions;
+   static const CompType Compressors[];
+
+   bool OpenCompress(const CompType *Prog,int &Pid,int FileFd,
+                    int &OutFd,bool Comp);
+   bool Child(int Fd);
+   bool Start();
+   bool Die();
+   
+   public:
+   
+   // The FD to write to for compression.
+   FILE *Input;
+   unsigned long UpdateMTime;
+   
+   bool Finalize(unsigned long &OutSize);
+   bool OpenOld(int &Fd,int &Proc);
+   bool CloseOld(int Fd,int Proc);
+   static bool GetStat(string Output,string Compress,struct stat &St);
+   
+   MultiCompress(string Output,string Compress,mode_t Permissions,
+                bool Write = true);
+   ~MultiCompress();
+};
+
+#endif