service_runtime/fs/xdr.h

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl file system mini XDR-like serialization of basic types.
  34  *
  35  * NB: this code has not been integrated with the rest of NaCl, and is
  36  * likely to change.
  37  */
  38
  39 #ifndef NATIVE_CLIENT_SERVICE_RUNTIME_FS_XDR_H_
  40 #define NATIVE_CLIENT_SERVICE_RUNTIME_FS_XDR_H_
  41
  42 #include "native_client/include/portability.h"
  43
  44 #include <string.h>
  45
  46 #include "native_client/include/nacl_base.h"
  47
  48 #include "native_client/service_runtime/include/machine/_types.h"
  49
  50 EXTERN_C_BEGIN
  51
  52 /*
  53  * knowledge about sizes for types of various file system RPC message
  54  * structures' members is not baked in here, but only in
  55  * machine/_types.h
  56  *
  57  * memcpy is (typically) a compiler intrinsic, so we should get
  58  * efficient code while maintaining type safety.  there are no byte
  59  * order issues when IMC can only communicate between processes on the
  60  * system.
  61  *
  62  * we violate the convention for in/out arg order so that code for
  63  * externalizatin/internalization of structures can be written more
  64  * easily using macros.
  65  */
  66
  67 #define D(T)                                                            \
  68   static INLINE size_t nacl_ext_ ## T(char *buf, nacl_abi_ ## T datum)  \
  69   {                                                                     \
  70     memcpy((void *) buf, (void *) &datum, sizeof datum);                \
  71     return sizeof datum;                                                \
  72   }                                                                     \
  73   static INLINE size_t nacl_int_ ## T(char *buf, nacl_abi_ ## T *datum) \
  74   {                                                                     \
  75     memcpy((void *) datum, (void *) buf, sizeof datum);                 \
  76     return sizeof datum;                                                \
  77   }
  78
  79 D(dev_t)
  80 D(ino_t)
  81 D(mode_t)
  82 D(uid_t)
  83 D(gid_t)
  84 D(nlink_t)
  85 D(off_t)
  86 D(time_t)
  87 D(size_t)
  88 D(ssize_t)
  89
  90 #undef D
  91
  92 #define D(T)                                                            \
  93   static INLINE size_t nacl_ext_ ## T(char *buf, T datum)               \
  94   {                                                                     \
  95     memcpy((void *) buf, (void *) &datum, sizeof datum);                \
  96     return sizeof datum;                                                \
  97   }                                                                     \
  98   static INLINE size_t nacl_int_ ## T(char *buf, T *datum)              \
  99   {                                                                     \
 100     memcpy((void *) datum, (void *) buf, sizeof datum);                 \
 101     return sizeof datum;                                                \
 102   }
 103
 104 D(int8_t)
 105 D(int16_t)
 106 D(int32_t)
 107 D(int64_t)
 108 D(uint8_t)
 109 D(uint16_t)
 110 D(uint32_t)
 111 D(uint64_t)
 112
 113 #undef D
 114
 115 EXTERN_C_END
 116
 117 #endif /* NATIVE_CLIENT_SERVICE_RUNTIME_FS_XDR_H_ */