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6181c85fa9
Replace traditional `#ifndef`/`#define`/`#endif` include guards with
`#pragma` once.
`#pragma once` is a widely supported preprocessor directive that
prevents header files from being included multiple times. It is
supported by all toolchains used to build edk2: GCC, Clang/LLVM, and
MSVC.
Compared to macro-based include guards, `#pragma once`:
- Eliminates the risk of macro name collisions or copy/paste errors
where two headers inadvertently use the same guard macro.
- Eliminate inconsistency in the way include guard macros are named
(e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.).
- Reduces boilerplate (three lines replaced by one).
- Avoids polluting the macro namespace with guard symbols.
- Can improve build times as the preprocessor can skip re-opening the
file entirely, rather than re-reading it to find the matching
`#endif` ("multiple-include optimization").
- Note that some compilers may already optimize traditional include
guards, by recognzining the idiomatic pattern.
This change is made acknowledging that overall portability of the
code will technically be reduced, as `#pragma once` is not part of the
C/C++ standards.
However, this is considered acceptable given:
1. edk2 already defines a subset of supported compilers in
BaseTools/Conf/tools_def.template, all of which have supported
`#pragma once` for over two decades.
2. There have been concerns raised to the project about inconsistent
include guard naming and potential macro collisions.
Approximate compiler support dates:
- MSVC: Supported since Visual C++ 4.2 (1996)
- GCC: Supported since 3.4 (2004)
(http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html)
- Clang (LLVM based): Since initial release in 2007
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
77 lines
3.2 KiB
C
77 lines
3.2 KiB
C
/** @file
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Definitinos of RedfishContentCodingLib.
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(C) Copyright 2021 Hewlett Packard Enterprise Development LP<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#pragma once
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/**
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This is the function to encode the content use the
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algorithm indicated in ContentEncodedValue. The naming of
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ContentEncodedValue is follow HTTP spec or could be a
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platform-specific value.
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@param[in] ContentEncodedValue HTTP conent encoded value.
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The value could be one of below
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or any which is platform-specific.
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- HTTP_CONTENT_ENCODING_IDENTITY "identity"
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- HTTP_CONTENT_ENCODING_GZIP "gzip"
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- HTTP_CONTENT_ENCODING_COMPRESS "compress"
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- HTTP_CONTENT_ENCODING_DEFLATE "deflate"
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- HTTP_CONTENT_ENCODING_BROTLI "br"
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@param[in] OriginalContent Original content.
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@param[in] OriginalContentLength The length of original content.
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@param[out] EncodedContentPointer Pointer to receive the encoded content pointer.
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@param[out] EncodedContentLength Length of encoded content.
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@retval EFI_SUCCESS Content is encoded successfully.
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@retval EFI_UNSUPPORTED No supported encoding funciton,
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@retval EFI_INVALID_PARAMETER One of the given parameter is invalid.
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**/
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EFI_STATUS
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RedfishContentEncode (
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IN CHAR8 *ContentEncodedValue,
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IN CHAR8 *OriginalContent,
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IN UINTN OriginalContentLength,
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OUT VOID **EncodedContentPointer,
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OUT UINTN *EncodedLength
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);
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/**
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This is the function to decode the content use the
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algorithm indicated in ContentEncodedValue. The naming of
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ContentEncodedValue is follow HTTP spec or could be a
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platform-specific value.
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@param[in] ContentDecodedValue HTTP conent decoded value.
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The value could be one of below
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or any which is platform-specific.
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- HTTP_CONTENT_ENCODING_IDENTITY "identity"
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- HTTP_CONTENT_ENCODING_GZIP "gzip"
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- HTTP_CONTENT_ENCODING_COMPRESS "compress"
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- HTTP_CONTENT_ENCODING_DEFLATE "deflate"
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- HTTP_CONTENT_ENCODING_BROTLI "br"
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@param[in] ContentPointer Original content.
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@param[in] ContentLength The length of original content.
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@param[out] DecodedContentPointer Pointer to receive decoded content pointer.
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@param[out] DecodedContentLength Length of decoded content.
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@retval EFI_SUCCESS Content is decoded successfully.
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@retval EFI_UNSUPPORTED No supported decoding funciton,
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@retval EFI_INVALID_PARAMETER One of the given parameter is invalid.
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**/
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EFI_STATUS
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RedfishContentDecode (
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IN CHAR8 *ContentEncodedValue,
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IN VOID *ContentPointer,
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IN UINTN ContentLength,
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OUT VOID **DecodedContentPointer,
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OUT UINTN *DecodedLength
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);
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