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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef MOJO_SPY_COMMON_H_
      6 #define MOJO_SPY_COMMON_H_
      7 
      8 #include <stdint.h>
      9 
     10 namespace mojo {
     11 
     12 #pragma pack(push, 1)
     13 
     14 // Mojo message header structures. These are based off the Mojo spec.
     15 
     16 enum {
     17   kMessageExpectsResponse = 1 << 0,
     18   kMessageIsResponse      = 1 << 1
     19 };
     20 
     21 struct MojoCommonHeader {
     22   uint32_t num_bytes;
     23   uint32_t num_fields;
     24 };
     25 
     26 struct MojoMessageHeader : public MojoCommonHeader {
     27   uint32_t name;
     28   uint32_t flags;
     29 };
     30 
     31 struct MojoRequestHeader : public MojoMessageHeader {
     32   uint64_t request_id;
     33 };
     34 
     35 struct MojoMessageData  {
     36   MojoRequestHeader header;
     37 };
     38 
     39 #pragma pack(pop)
     40 
     41 }  // namespace mojo
     42 
     43 #endif  // MOJO_SPY_COMMON_H_
     44