pipe_fd.cpp

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/*************************************************
* Pipe I/O for Unix Source File                  *
* (C) 1999-2002 The Botan Project                *
*************************************************/

#include <botan/pipe.h>
#include <unistd.h>

namespace Botan {

/*************************************************
* Write data from a pipe into a Unix fd          *
*************************************************/
int operator<<(int fd, Pipe& pipe)
   {
   static const u32bit BUFFERSIZE = DEFAULT_BUFFERSIZE;
   SecureBuffer<byte, BUFFERSIZE> buffer;
   while(pipe.remaining())
      {
      u32bit got = pipe.read(buffer, BUFFERSIZE);
      u32bit position = 0;
      while(got)
         {
         ssize_t ret = write(fd, buffer + position, got);
         if(ret == -1)
            throw Stream_IO_Error("Pipe output operator (unixfd) has failed");
         position += ret;
         got -= ret;
         }
      }
   return fd;
   }

/*************************************************
* Read data from a Unix fd into a pipe           *
*************************************************/
int operator>>(int fd, Pipe& pipe)
   {
   static const u32bit BUFFERSIZE = DEFAULT_BUFFERSIZE;
   SecureBuffer<byte, BUFFERSIZE> buffer;
   while(true)
      {
      ssize_t ret = read(fd, buffer, BUFFERSIZE);
      if(ret == 0) break;
      if(ret == -1)
         throw Stream_IO_Error("Pipe input operator (unixfd) has failed");
      pipe.write(buffer, ret);
      }
   return fd;
   }

}