release/src-rt-6.x/linux/linux-2.6/scripts/squashfs/lzma/C/Common/C_FileIO.cpp

   1 // Common/C_FileIO.h
   2
   3 #include "C_FileIO.h"
   4
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7
   8 namespace NC {
   9 namespace NFile {
  10 namespace NIO {
  11
  12 bool CFileBase::OpenBinary(const char *name, int flags)
  13 {
  14   #ifdef O_BINARY
  15   flags |= O_BINARY;
  16   #endif
  17   Close();
  18   _handle = ::open(name, flags, 0666);
  19   return _handle != -1;
  20 }
  21
  22 bool CFileBase::Close()
  23 {
  24   if(_handle == -1)
  25     return true;
  26   if (close(_handle) != 0)
  27     return false;
  28   _handle = -1;
  29   return true;
  30 }
  31
  32 bool CFileBase::GetLength(UInt64 &length) const
  33 {
  34   off_t curPos = Seek(0, SEEK_CUR);
  35   off_t lengthTemp = Seek(0, SEEK_END);
  36   Seek(curPos, SEEK_SET);
  37   length = (UInt64)lengthTemp;
  38   return true;
  39 }
  40
  41 off_t CFileBase::Seek(off_t distanceToMove, int moveMethod) const
  42 {
  43   return ::lseek(_handle, distanceToMove, moveMethod);
  44 }
  45
  46 /////////////////////////
  47 // CInFile
  48
  49 bool CInFile::Open(const char *name)
  50 {
  51   return CFileBase::OpenBinary(name, O_RDONLY);
  52 }
  53
  54 ssize_t CInFile::Read(void *data, size_t size)
  55 {
  56   return read(_handle, data, size);
  57 }
  58
  59 /////////////////////////
  60 // COutFile
  61
  62 bool COutFile::Create(const char *name, bool createAlways)
  63 {
  64   if (createAlways)
  65   {
  66     Close();
  67     _handle = ::creat(name, 0666);
  68     return _handle != -1;
  69   }
  70   return OpenBinary(name, O_CREAT | O_EXCL | O_WRONLY);
  71 }
  72
  73 ssize_t COutFile::Write(const void *data, size_t size)
  74 {
  75   return write(_handle, data, size);
  76 }
  77
  78 }}}