apt-pkg/contrib/fileutl.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: fileutl.h,v 1.26 2001/05/07 05:06:52 jgg Exp $
   4 /* ######################################################################
   5
   6    File Utilities
   7
   8    CopyFile - Buffered copy of a single file
   9    GetLock - dpkg compatible lock file manipulation (fcntl)
  10    FileExists - Returns true if the file exists
  11    SafeGetCWD - Returns the CWD in a string with overrun protection
  12
  13    The file class is a handy abstraction for various functions+classes
  14    that need to accept filenames.
  15
  16    This source is placed in the Public Domain, do with it what you will
  17    It was originally written by Jason Gunthorpe.
  18
  19    ##################################################################### */
  20                                                                         /*}}}*/
  21 #ifndef PKGLIB_FILEUTL_H
  22 #define PKGLIB_FILEUTL_H
  23
  24 #include <apt-pkg/macros.h>
  25 #include <apt-pkg/aptconfiguration.h>
  26
  27 #include <string>
  28 #include <vector>
  29
  30 #include <zlib.h>
  31
  32 #ifndef APT_8_CLEANER_HEADERS
  33 using std::string;
  34 #endif
  35
  36 /* Define this for python-apt */
  37 #define APT_HAS_GZIP 1
  38
  39 class FileFdPrivate;
  40 class FileFd
  41 {
  42    protected:
  43    int iFd;
  44
  45    enum LocalFlags {AutoClose = (1<<0),Fail = (1<<1),DelOnFail = (1<<2),
  46                     HitEof = (1<<3), Replace = (1<<4), Compressed = (1<<5) };
  47    unsigned long Flags;
  48    std::string FileName;
  49    std::string TemporaryFileName;
  50
  51    public:
  52    enum OpenMode {
  53         ReadOnly = (1 << 0),
  54         WriteOnly = (1 << 1),
  55         ReadWrite = ReadOnly | WriteOnly,
  56
  57         Create = (1 << 2),
  58         Exclusive = (1 << 3),
  59         Atomic = Exclusive | (1 << 4),
  60         Empty = (1 << 5),
  61
  62         WriteEmpty = ReadWrite | Create | Empty,
  63         WriteExists = ReadWrite,
  64         WriteAny = ReadWrite | Create,
  65         WriteTemp = ReadWrite | Create | Exclusive,
  66         ReadOnlyGzip,
  67         WriteAtomic = ReadWrite | Create | Atomic
  68    };
  69    enum CompressMode { Auto = 'A', None = 'N', Extension = 'E', Gzip = 'G', Bzip2 = 'B', Lzma = 'L', Xz = 'X' };
  70
  71    inline bool Read(void *To,unsigned long long Size,bool AllowEof)
  72    {
  73       unsigned long long Jnk;
  74       if (AllowEof)
  75          return Read(To,Size,&Jnk);
  76       return Read(To,Size);
  77    }
  78    bool Read(void *To,unsigned long long Size,unsigned long long *Actual = 0);
  79    char* ReadLine(char *To, unsigned long long const Size);
  80    bool Write(const void *From,unsigned long long Size);
  81    bool Seek(unsigned long long To);
  82    bool Skip(unsigned long long To);
  83    bool Truncate(unsigned long long To);
  84    unsigned long long Tell();
  85    unsigned long long Size();
  86    unsigned long long FileSize();
  87    time_t ModificationTime();
  88
  89    /* You want to use 'unsigned long long' if you are talking about a file
  90       to be able to support large files (>2 or >4 GB) properly.
  91       This shouldn't happen all to often for the indexes, but deb's might be…
  92       And as the auto-conversation converts a 'unsigned long *' to a 'bool'
  93       instead of 'unsigned long long *' we need to provide this explicitely -
  94       otherwise applications magically start to fail… */
  95    __deprecated bool Read(void *To,unsigned long long Size,unsigned long *Actual)
  96    {
  97         unsigned long long R;
  98         bool const T = Read(To, Size, &R);
  99         *Actual = R;
 100         return T;
 101    }
 102
 103    bool Open(std::string FileName,unsigned int const Mode,CompressMode Compress,unsigned long const Perms = 0666);
 104    bool Open(std::string FileName,unsigned int const Mode,APT::Configuration::Compressor const &compressor,unsigned long const Perms = 0666);
 105    inline bool Open(std::string const &FileName,unsigned int const Mode, unsigned long const Perms = 0666) {
 106       return Open(FileName, Mode, None, Perms);
 107    };
 108    bool OpenDescriptor(int Fd, unsigned int const Mode, CompressMode Compress, bool AutoClose=false);
 109    bool OpenDescriptor(int Fd, unsigned int const Mode, APT::Configuration::Compressor const &compressor, bool AutoClose=false);
 110    inline bool OpenDescriptor(int Fd, unsigned int const Mode, bool AutoClose=false) {
 111       return OpenDescriptor(Fd, Mode, None, AutoClose);
 112    };
 113    bool Close();
 114    bool Sync();
 115
 116    // Simple manipulators
 117    inline int Fd() {return iFd;};
 118    inline void Fd(int fd) { OpenDescriptor(fd, ReadWrite);};
 119    __deprecated gzFile gzFd();
 120
 121    inline bool IsOpen() {return iFd >= 0;};
 122    inline bool Failed() {return (Flags & Fail) == Fail;};
 123    inline void EraseOnFailure() {Flags |= DelOnFail;};
 124    inline void OpFail() {Flags |= Fail;};
 125    inline bool Eof() {return (Flags & HitEof) == HitEof;};
 126    inline bool IsCompressed() {return (Flags & Compressed) == Compressed;};
 127    inline std::string &Name() {return FileName;};
 128
 129    FileFd(std::string FileName,unsigned int const Mode,unsigned long Perms = 0666) : iFd(-1), Flags(0), d(NULL)
 130    {
 131       Open(FileName,Mode, None, Perms);
 132    };
 133    FileFd(std::string FileName,unsigned int const Mode, CompressMode Compress, unsigned long Perms = 0666) : iFd(-1), Flags(0), d(NULL)
 134    {
 135       Open(FileName,Mode, Compress, Perms);
 136    };
 137    FileFd() : iFd(-1), Flags(AutoClose), d(NULL) {};
 138    FileFd(int const Fd, unsigned int const Mode = ReadWrite, CompressMode Compress = None) : iFd(-1), Flags(0), d(NULL)
 139    {
 140       OpenDescriptor(Fd, Mode, Compress);
 141    };
 142    FileFd(int const Fd, bool const AutoClose) : iFd(-1), Flags(0), d(NULL)
 143    {
 144       OpenDescriptor(Fd, ReadWrite, None, AutoClose);
 145    };
 146    virtual ~FileFd();
 147
 148    private:
 149    FileFdPrivate* d;
 150    bool OpenInternDescriptor(unsigned int const Mode, APT::Configuration::Compressor const &compressor);
 151 };
 152
 153 bool RunScripts(const char *Cnf);
 154 bool CopyFile(FileFd &From,FileFd &To);
 155 int GetLock(std::string File,bool Errors = true);
 156 bool FileExists(std::string File);
 157 bool RealFileExists(std::string File);
 158 bool DirectoryExists(std::string const &Path) __attrib_const;
 159 bool CreateDirectory(std::string const &Parent, std::string const &Path);
 160 time_t GetModificationTime(std::string const &Path);
 161
 162 /** \brief Ensure the existence of the given Path
 163  *
 164  *  \param Parent directory of the Path directory - a trailing
 165  *  /apt/ will be removed before CreateDirectory call.
 166  *  \param Path which should exist after (successful) call
 167  */
 168 bool CreateAPTDirectoryIfNeeded(std::string const &Parent, std::string const &Path);
 169
 170 std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::string const &Ext,
 171                                         bool const &SortList, bool const &AllowNoExt=false);
 172 std::vector<std::string> GetListOfFilesInDir(std::string const &Dir, std::vector<std::string> const &Ext,
 173                                         bool const &SortList);
 174 std::string SafeGetCWD();
 175 void SetCloseExec(int Fd,bool Close);
 176 void SetNonBlock(int Fd,bool Block);
 177 bool WaitFd(int Fd,bool write = false,unsigned long timeout = 0);
 178 pid_t ExecFork();
 179 bool ExecWait(pid_t Pid,const char *Name,bool Reap = false);
 180
 181 // File string manipulators
 182 std::string flNotDir(std::string File);
 183 std::string flNotFile(std::string File);
 184 std::string flNoLink(std::string File);
 185 std::string flExtension(std::string File);
 186 std::string flCombine(std::string Dir,std::string File);
 187
 188 #endif