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OvmfPkg/VirtioFsDxe: add helper for formatting UEFI basenames

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The EFI_FILE_INFO structure, which is output by
EFI_FILE_PROTOCOL.GetInfo(), ends with a flexible CHAR16 array called
"FileName". Add the VirtioFsGetBasename() function, for determining the
required array size, and for filling the array as well.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-30-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Laszlo Ersek 2020-12-16 22:11:06 +01:00 committed by mergify[bot]
parent ba1184630a
commit 44bc78790e
2 changed files with 68 additions and 0 deletions
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61
OvmfPkg/VirtioFsDxe/Helpers.c
View File

@ -1722,6 +1722,67 @@ ForgetNextDirNodeId:
return Status;
}
/**
Format the last component of a canonical pathname into a caller-provided
CHAR16 array.
@param[in] Path The canonical pathname (as defined in the
description of VirtioFsAppendPath()) to format
the last component of.
@param[out] Basename If BasenameSize is zero on input, Basename may
be NULL. Otherwise, Basename is allocated by the
caller. On successful return, Basename contains
the last component of Path, formatted as a
NUL-terminated CHAR16 string. When Path is "/"
on input, Basename is L"" on output.
@param[in,out] BasenameSize On input, the number of bytes the caller
provides in Basename. On output, regardless of
return value, the number of bytes required for
formatting Basename, including the terminating
L'\0'.
@retval EFI_SUCCESS Basename has been filled in.
@retval EFI_BUFFER_TOO_SMALL BasenameSize was too small on input; Basename
has not been modified.
**/
EFI_STATUS
VirtioFsGetBasename (
IN CHAR8 *Path,
OUT CHAR16 *Basename OPTIONAL,
IN OUT UINTN *BasenameSize
)
{
UINTN AllocSize;
UINTN LastComponent;
UINTN Idx;
UINTN PathSize;
AllocSize = *BasenameSize;
LastComponent = MAX_UINTN;
for (Idx = 0; Path[Idx] != '\0'; Idx++) {
if (Path[Idx] == '/') {
LastComponent = Idx;
}
}
PathSize = Idx + 1;
ASSERT (LastComponent < MAX_UINTN);
LastComponent++;
*BasenameSize = (PathSize - LastComponent) * sizeof Basename[0];
if (*BasenameSize > AllocSize) {
return EFI_BUFFER_TOO_SMALL;
}
for (Idx = LastComponent; Idx < PathSize; Idx++) {
Basename[Idx - LastComponent] = Path[Idx];
}
return EFI_SUCCESS;
}
/**
Convert select fields of a VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object to
corresponding fields in EFI_FILE_INFO.

7
OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
View File

@ -234,6 +234,13 @@ VirtioFsLookupMostSpecificParentDir (
OUT CHAR8 **LastComponent
);
EFI_STATUS
VirtioFsGetBasename (
IN CHAR8 *Path,
OUT CHAR16 *Basename OPTIONAL,
IN OUT UINTN *BasenameSize
);
EFI_STATUS
VirtioFsFuseAttrToEfiFileInfo (
IN VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr,