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1 // Copyright 2016 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_PUBLIC_C_BINDINGS_LIB_UTIL_H_ | |
6 #define MOJO_PUBLIC_C_BINDINGS_LIB_UTIL_H_ | |
7 | |
8 #include <mojo/macros.h> | |
9 | |
10 // Rounds-up |num| to 8. The result is undefined if this results in an overflow. | |
11 #define MOJOM_INTERNAL_ROUND_TO_8(num) (((num) + 7) & ~7) | |
12 | |
13 // Represents the memory layout of a mojom pointer; it is a |ptr| (pointer to | |
14 // some memory) when unencoded, and refers to a relative |offset| when encoded. | |
15 union MojomPointer { | |
16 void* ptr; | |
17 uint64_t offset; | |
18 }; | |
19 MOJO_STATIC_ASSERT(sizeof(union MojomPointer) == 8, | |
20 "union MojomPointer must be 8 bytes"); | |
21 | |
22 // This struct represents the state we need to keep when validating an encoded | |
23 // mojom type. | |
24 struct MojomValidationContext { | |
25 // |next_handle_index| is a counter that represents the next-available index | |
26 // into the handle array. Previous indices have already been used up. This | |
27 // counter is non-decreasing as it is used throughout validation. | |
28 uint32_t next_handle_index; | |
29 | |
30 // As we validate, we keep track of the point where pointers can point to, | |
31 // since two pointers may not point to the same memory region. | |
32 char* next_pointer; | |
33 | |
34 // TODO(vardhan): Include an error string? How big should it be? | |
35 }; | |
36 | |
37 #endif // MOJO_PUBLIC_C_BINDINGS_LIB_UTIL_H_ | |
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