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[CSRLIB] Add comments regarding the calculation of the data and total message lengths in CsrClientCallServer().
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1 changed files with 6 additions and 3 deletions
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@ -386,10 +386,13 @@ CsrClientCallServer(
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/* Fill out the Port Message Header */
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ApiMessage->Header.u2.ZeroInit = 0;
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ApiMessage->Header.u1.s1.TotalLength = (CSHORT)DataLength +
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sizeof(CSR_API_MESSAGE) - sizeof(ApiMessage->Data); // FIELD_OFFSET(CSR_API_MESSAGE, Data) + DataLength;
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/* DataLength = user_data_size + anything between
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* header and data, including intermediate padding */
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ApiMessage->Header.u1.s1.DataLength = (CSHORT)DataLength +
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FIELD_OFFSET(CSR_API_MESSAGE, Data) - sizeof(ApiMessage->Header); // ApiMessage->Header.u1.s1.TotalLength - sizeof(PORT_MESSAGE);
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FIELD_OFFSET(CSR_API_MESSAGE, Data) - sizeof(ApiMessage->Header);
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/* TotalLength = header_size + DataLength + any structure trailing padding */
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ApiMessage->Header.u1.s1.TotalLength = (CSHORT)DataLength +
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sizeof(CSR_API_MESSAGE) - sizeof(ApiMessage->Data);
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/* Fill out the CSR Header */
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ApiMessage->ApiNumber = ApiNumber;
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