src/kits/package/hpkg/FDDataReader.cpp

   1 /*
   2  * Copyright 2009-2011, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include <package/hpkg/DataReader.h>
   8
   9 #include <errno.h>
  10 #include <unistd.h>
  11
  12
  13 namespace BPackageKit {
  14
  15 namespace BHPKG {
  16
  17
  18 BFDDataReader::BFDDataReader(int fd)
  19         :
  20         fFD(fd)
  21 {
  22 }
  23
  24
  25 void
  26 BFDDataReader::SetFD(int fd)
  27 {
  28         fFD = fd;
  29 }
  30
  31
  32 status_t
  33 BFDDataReader::ReadData(off_t offset, void* buffer, size_t size)
  34 {
  35         ssize_t bytesRead = pread(fFD, buffer, size, offset);
  36         if (bytesRead < 0)
  37                 return errno;
  38         return (size_t)bytesRead == size ? B_OK : B_ERROR;
  39 }
  40
  41
  42 }       // namespace BHPKG
  43
  44 }       // namespace BPackageKit