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1 // -*- mode: cpp; mode: fold -*-
2 // Description /*{{{*/
3 // $Id: multicompress.h,v 1.2 2001/02/20 07:03:18 jgg Exp $
4 /* ######################################################################
5
6 MultiCompressor
7
8 Multiple output class. Takes a single FILE* and writes it simultaneously
9 to many compressed files. Then checks if the resulting output is
10 different from any previous output and overwrites the old files. Care is
11 taken to ensure that the new files are not generally readable while they
12 are being written.
13
14 ##################################################################### */
15 /*}}}*/
16 #ifndef MULTICOMPRESS_H
17 #define MULTICOMPRESS_H
18
19
20
21 #include <string>
22 #include <apt-pkg/fileutl.h>
23 #include <stdio.h>
24 #include <sys/types.h>
25
26 class MultiCompress
27 {
28 // Enumeration of all supported compressors
29 struct CompType
30 {
31 const char *Name;
32 const char *Extension;
33 const char *Binary;
34 const char *CompArgs;
35 const char *UnCompArgs;
36 unsigned char Cost;
37 };
38
39 // An output file
40 struct Files
41 {
42 string Output;
43 const CompType *CompressProg;
44 Files *Next;
45 FileFd TmpFile;
46 pid_t CompressProc;
47 time_t OldMTime;
48 int Fd;
49 };
50
51 Files *Outputs;
52 pid_t Outputter;
53 mode_t Permissions;
54 static const CompType Compressors[];
55
56 bool OpenCompress(const CompType *Prog,pid_t &Pid,int FileFd,
57 int &OutFd,bool Comp);
58 bool Child(int Fd);
59 bool Start();
60 bool Die();
61
62 public:
63
64 // The FD to write to for compression.
65 FILE *Input;
66 unsigned long UpdateMTime;
67
68 bool Finalize(unsigned long &OutSize);
69 bool OpenOld(int &Fd,pid_t &Proc);
70 bool CloseOld(int Fd,pid_t Proc);
71 static bool GetStat(string Output,string Compress,struct stat &St);
72
73 MultiCompress(string Output,string Compress,mode_t Permissions,
74 bool Write = true);
75 ~MultiCompress();
76 };
77
78 #endif