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https://github.com/tianocore/edk2
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0e6d10de1c
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.
Note: Some files in BaseTools are excluded from the change if they
are autogenerated or direcly related to a header from a subproject,
etc. In particular, headers in these directories were ignored:
- BaseTools/Source/C/LzmaCompress/Sdk/
- BaseTools/Source/C/VfrCompile/Pccts/
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>
187 lines
3.3 KiB
C
187 lines
3.3 KiB
C
/** @file
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These functions assist in parsing and manipulating a Firmware Volume.
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Copyright (c) 2004 - 2018, Intel Corporation. All rights reserved.<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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// Include files
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//
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#include <string.h>
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#include <Common/UefiBaseTypes.h>
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#include <Common/PiFirmwareFile.h>
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#include <Common/PiFirmwareVolume.h>
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EFI_STATUS
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InitializeFvLib (
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IN VOID *Fv,
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IN UINT32 FvLength
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)
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;
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EFI_STATUS
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GetFvHeader (
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OUT EFI_FIRMWARE_VOLUME_HEADER **FvHeader,
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OUT UINT32 *FvLength
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)
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;
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EFI_STATUS
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GetNextFile (
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IN EFI_FFS_FILE_HEADER *CurrentFile,
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OUT EFI_FFS_FILE_HEADER **NextFile
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)
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;
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EFI_STATUS
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GetFileByName (
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IN EFI_GUID *FileName,
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OUT EFI_FFS_FILE_HEADER **File
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)
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;
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EFI_STATUS
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GetFileByType (
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IN EFI_FV_FILETYPE FileType,
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IN UINTN Instance,
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OUT EFI_FFS_FILE_HEADER **File
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)
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;
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EFI_STATUS
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GetSectionByType (
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IN EFI_FFS_FILE_HEADER *File,
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IN EFI_SECTION_TYPE SectionType,
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IN UINTN Instance,
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OUT EFI_FILE_SECTION_POINTER *Section
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)
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;
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//
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// will not parse compressed sections
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//
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EFI_STATUS
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VerifyFv (
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IN EFI_FIRMWARE_VOLUME_HEADER *FvHeader
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)
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;
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EFI_STATUS
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VerifyFfsFile (
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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;
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UINT32
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GetFfsFileLength (
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EFI_FFS_FILE_HEADER *FfsHeader
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)
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;
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UINT32
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GetSectionFileLength (
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EFI_COMMON_SECTION_HEADER *SectionHeader
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)
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;
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UINT32
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GetFfsHeaderLength(
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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;
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UINT32
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GetSectionHeaderLength(
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IN EFI_COMMON_SECTION_HEADER *SectionHeader
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)
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;
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/*++
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Routine Description:
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Verify the current pointer points to a FFS file header.
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Arguments:
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FfsHeader Pointer to an alleged FFS file.
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Returns:
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EFI_SUCCESS The Ffs header is valid.
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EFI_NOT_FOUND This "file" is the beginning of free space.
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EFI_VOLUME_CORRUPTED The Ffs header is not valid.
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--*/
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UINT32
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GetLength (
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UINT8 *ThreeByteLength
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)
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;
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/*++
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Routine Description:
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Converts a three byte length value into a UINT32.
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Arguments:
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ThreeByteLength Pointer to the first of the 3 byte length.
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Returns:
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UINT32 Size of the section
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--*/
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EFI_STATUS
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GetErasePolarity (
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OUT BOOLEAN *ErasePolarity
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)
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;
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/*++
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Routine Description:
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This function returns with the FV erase polarity. If the erase polarity
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for a bit is 1, the function return TRUE.
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Arguments:
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ErasePolarity A pointer to the erase polarity.
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Returns:
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EFI_SUCCESS The function completed successfully.
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EFI_INVALID_PARAMETER One of the input parameters was invalid.
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--*/
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UINT8
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GetFileState (
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IN BOOLEAN ErasePolarity,
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IN EFI_FFS_FILE_HEADER *FfsHeader
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)
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;
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/*++
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Routine Description:
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This function returns a the highest state bit in the FFS that is set.
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It in no way validate the FFS file.
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Arguments:
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ErasePolarity The erase polarity for the file state bits.
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FfsHeader Pointer to a FFS file.
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Returns:
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UINT8 The hightest set state of the file.
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--*/
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