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108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/** @file
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Internal file explorer helper functions for RamDiskDxe driver.
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Copyright (c) 2016, 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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#include "RamDiskImpl.h"
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/**
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Helper function called as part of the code needed to allocate the proper
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sized buffer for various EFI interfaces.
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@param[in, out] Status Current status.
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@param[in, out] Buffer Current allocated buffer, or NULL.
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@param[in] BufferSize Current buffer size needed.
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@retval TRUE If the buffer was reallocated and the caller should
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try the API again.
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@retval FALSE The caller should not call this function again.
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**/
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BOOLEAN
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GrowBuffer (
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IN OUT EFI_STATUS *Status,
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IN OUT VOID **Buffer,
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IN UINTN BufferSize
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)
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{
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BOOLEAN TryAgain;
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//
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// If this is an initial request, buffer will be null with a new buffer size
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//
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if ((*Buffer == NULL) && (BufferSize != 0)) {
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*Status = EFI_BUFFER_TOO_SMALL;
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}
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//
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// If the status code is "buffer too small", resize the buffer
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//
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TryAgain = FALSE;
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if (*Status == EFI_BUFFER_TOO_SMALL) {
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if (*Buffer != NULL) {
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FreePool(*Buffer);
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}
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*Buffer = AllocateZeroPool(BufferSize);
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if (*Buffer != NULL) {
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TryAgain = TRUE;
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} else {
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*Status = EFI_OUT_OF_RESOURCES;
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}
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}
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//
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// If there's an error, free the buffer
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//
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if (!TryAgain && EFI_ERROR(*Status) && (*Buffer != NULL)) {
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FreePool(*Buffer);
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*Buffer = NULL;
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}
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return TryAgain;
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}
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/**
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This function gets the file information from an open file descriptor,
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and stores it in a buffer allocated from pool.
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@param[in] FHand File Handle.
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@return A pointer to a buffer with file information or NULL is returned.
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**/
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EFI_FILE_INFO *
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FileInfo (
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IN EFI_FILE_HANDLE FHand
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)
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{
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EFI_STATUS Status;
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EFI_FILE_INFO *Buffer;
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UINTN BufferSize;
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//
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// Initialize for GrowBuffer loop
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//
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Buffer = NULL;
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BufferSize = SIZE_OF_EFI_FILE_INFO + 200;
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//
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// Call the real function
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//
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while (GrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
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Status = FHand->GetInfo (
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FHand,
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&gEfiFileInfoGuid,
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&BufferSize,
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Buffer
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);
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}
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return Buffer;
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}
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