Make the fuchsia mojo/public repo the source of truth.

mojo/public/c/lib/bindings/message.c

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include <mojo/bindings/message.h>
-
-#include <mojo/bindings/struct.h>
-#include <stdint.h>
-
-MojomValidationResult MojomMessage_ValidateHeader(const void* in_buf,
-                                                  uint32_t in_buf_size) {
-  const struct MojomStructHeader* header =
-      (const struct MojomStructHeader*)in_buf;
-
-  if (in_buf_size < sizeof(struct MojomStructHeader) ||
-      in_buf_size < header->num_bytes)
-    return MOJOM_VALIDATION_ILLEGAL_MEMORY_RANGE;
-
-  const struct MojomMessage* msg = (const struct MojomMessage*)in_buf;
-  if (header->version == 0u) {
-    if (header->num_bytes != sizeof(struct MojomMessage)) {
-      return MOJOM_VALIDATION_UNEXPECTED_STRUCT_HEADER;
-    }
-
-    // Version 0 has no request id and should not have either of these flags.
-    if ((msg->flags & MOJOM_MESSAGE_FLAGS_EXPECTS_RESPONSE) ||
-        (msg->flags & MOJOM_MESSAGE_FLAGS_IS_RESPONSE)) {
-      return MOJOM_VALIDATION_MESSAGE_HEADER_MISSING_REQUEST_ID;
-    }
-  } else if (header->version == 1u) {
-    if (header->num_bytes != sizeof(struct MojomMessageWithRequestId)) {
-      return MOJOM_VALIDATION_UNEXPECTED_STRUCT_HEADER;
-    }
-  } else if (header->version > 1u) {
-    if (header->num_bytes < sizeof(struct MojomMessageWithRequestId)) {
-      return MOJOM_VALIDATION_UNEXPECTED_STRUCT_HEADER;
-    }
-  }
-
-  // Mutually exclusive flags.
-  if ((msg->flags & MOJOM_MESSAGE_FLAGS_EXPECTS_RESPONSE) &&
-      (msg->flags & MOJOM_MESSAGE_FLAGS_IS_RESPONSE)) {
-    return MOJOM_VALIDATION_MESSAGE_HEADER_INVALID_FLAGS;
-  }
-
-  // Accept unknown versions of the message header to be future-proof.
-  return MOJOM_VALIDATION_ERROR_NONE;
-}
-
-MojomValidationResult MojomMessage_ValidateRequestExpectingResponse(
-    const void* in_buf) {
-  const struct MojomMessage* msg = (const struct MojomMessage*)in_buf;
-  return (msg->flags & MOJOM_MESSAGE_FLAGS_EXPECTS_RESPONSE)
-             ? MOJOM_VALIDATION_ERROR_NONE
-             : MOJOM_VALIDATION_MESSAGE_HEADER_INVALID_FLAGS;
-}
-
-MojomValidationResult MojomMessage_ValidateRequestWithoutResponse(
-    const void* in_buf) {
-  const struct MojomMessage* msg = (const struct MojomMessage*)in_buf;
-  return (!(msg->flags & MOJOM_MESSAGE_FLAGS_EXPECTS_RESPONSE) &&
-                 !(msg->flags & MOJOM_MESSAGE_FLAGS_IS_RESPONSE))
-             ? MOJOM_VALIDATION_ERROR_NONE
-             : MOJOM_VALIDATION_MESSAGE_HEADER_INVALID_FLAGS;
-}
-
-MojomValidationResult MojomMessage_ValidateResponse(
-    const void* in_buf) {
-  const struct MojomMessage* msg = (const struct MojomMessage*)in_buf;
-  return (msg->flags & MOJOM_MESSAGE_FLAGS_IS_RESPONSE)
-             ? MOJOM_VALIDATION_ERROR_NONE
-             : MOJOM_VALIDATION_MESSAGE_HEADER_INVALID_FLAGS;
-}