libnpfs/trans.c

   1 /*
   2  * Copyright (C) 2005 by Latchesar Ionkov <lucho@ionkov.net>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * LATCHESAR IONKOV AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <errno.h>
  27 #include "npfs.h"
  28 #include "npfsimpl.h"
  29
  30 Nptrans *
  31 np_trans_create(void *aux, int (*read)(u8 *, u32, void *),
  32         int (*write)(u8 *, u32, void *), void (*destroy)(void *))
  33 {
  34         Nptrans *trans;
  35
  36         trans = malloc(sizeof(*trans));
  37
  38         if (!trans)
  39                 return NULL;
  40
  41         trans->aux = aux;
  42         trans->read = read;
  43         trans->write = write;
  44         trans->destroy = destroy;
  45
  46         return trans;
  47 }
  48
  49 void
  50 np_trans_destroy(Nptrans *trans)
  51 {
  52         if (trans->destroy)
  53                 (*trans->destroy)(trans->aux);
  54         free(trans);
  55 }
  56
  57 int
  58 np_trans_write(Nptrans *trans, u8* data, u32 count)
  59 {
  60         if (trans->write)
  61                 return trans->write(data, count, trans->aux);
  62         else
  63                 return -1;
  64 }
  65
  66 int
  67 np_trans_read(Nptrans *trans, u8* data, u32 count)
  68 {
  69         if (trans->read)
  70                 return trans->read(data, count, trans->aux);
  71         else
  72                 return -1;
  73 }
  74