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/** @file
Helper functions for SecureBoot configuration module.
Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "SecureBootConfigImpl.h"
/**
Read file content into BufferPtr, the size of the allocate buffer
is *FileSize plus AdditionAllocateSize.
@param[in] FileHandle The file to be read.
@param[in, out] BufferPtr Pointers to the pointer of allocated buffer.
@param[out] FileSize Size of input file
@param[in] AdditionAllocateSize Addition size the buffer need to be allocated.
In case the buffer need to contain others besides the file content.
@retval EFI_SUCCESS The file was read into the buffer.
@retval EFI_INVALID_PARAMETER A parameter was invalid.
@retval EFI_OUT_OF_RESOURCES A memory allocation failed.
@retval others Unexpected error.
**/
EFI_STATUS
ReadFileContent (
IN EFI_FILE_HANDLE FileHandle,
IN OUT VOID **BufferPtr,
OUT UINTN *FileSize,
IN UINTN AdditionAllocateSize
)
{
UINTN BufferSize;
UINT64 SourceFileSize;
VOID *Buffer;
EFI_STATUS Status;
if ((FileHandle == NULL) || (FileSize == NULL)) {
return EFI_INVALID_PARAMETER;
}
Buffer = NULL;
//
// Get the file size
//
Status = FileHandle->SetPosition (FileHandle, (UINT64) -1);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
Status = FileHandle->GetPosition (FileHandle, &SourceFileSize);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
Status = FileHandle->SetPosition (FileHandle, 0);
if (EFI_ERROR (Status)) {
goto ON_EXIT;
}
BufferSize = (UINTN) SourceFileSize + AdditionAllocateSize;
Buffer = AllocateZeroPool(BufferSize);
if (Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
BufferSize = (UINTN) SourceFileSize;
*FileSize = BufferSize;
Status = FileHandle->Read (FileHandle, &BufferSize, Buffer);
if (EFI_ERROR (Status) || BufferSize != *FileSize) {
FreePool (Buffer);
Buffer = NULL;
Status = EFI_BAD_BUFFER_SIZE;
goto ON_EXIT;
}
ON_EXIT:
*BufferPtr = Buffer;
return Status;
}
/**
Close an open file handle.
@param[in] FileHandle The file handle to close.
**/
VOID
CloseFile (
IN EFI_FILE_HANDLE FileHandle
)
{
if (FileHandle != NULL) {
FileHandle->Close (FileHandle);
}
}
/**
Convert a nonnegative integer to an octet string of a specified length.
@param[in] Integer Pointer to the nonnegative integer to be converted
@param[in] IntSizeInWords Length of integer buffer in words
@param[out] OctetString Converted octet string of the specified length
@param[in] OSSizeInBytes Intended length of resulting octet string in bytes
Returns:
@retval EFI_SUCCESS Data conversion successfully
@retval EFI_BUFFER_TOOL_SMALL Buffer is too small for output string
**/
EFI_STATUS
EFIAPI
Int2OctStr (
IN CONST UINTN *Integer,
IN UINTN IntSizeInWords,
OUT UINT8 *OctetString,
IN UINTN OSSizeInBytes
)
{
CONST UINT8 *Ptr1;
UINT8 *Ptr2;
for (Ptr1 = (CONST UINT8 *)Integer, Ptr2 = OctetString + OSSizeInBytes - 1;
Ptr1 < (UINT8 *)(Integer + IntSizeInWords) && Ptr2 >= OctetString;
Ptr1++, Ptr2--) {
*Ptr2 = *Ptr1;
}
for (; Ptr1 < (CONST UINT8 *)(Integer + IntSizeInWords) && *Ptr1 == 0; Ptr1++);
if (Ptr1 < (CONST UINT8 *)(Integer + IntSizeInWords)) {
return EFI_BUFFER_TOO_SMALL;
}
if (Ptr2 >= OctetString) {
ZeroMem (OctetString, Ptr2 - OctetString + 1);
}
return EFI_SUCCESS;
}
/**
Worker function that prints an EFI_GUID into specified Buffer.
@param[in] Guid Pointer to GUID to print.
@param[in] Buffer Buffer to print Guid into.
@param[in] BufferSize Size of Buffer.
@retval Number of characters printed.
**/
UINTN
GuidToString (
IN EFI_GUID *Guid,
IN CHAR16 *Buffer,
IN UINTN BufferSize
)
{
UINTN Size;
Size = UnicodeSPrint (
Buffer,
BufferSize,
L"%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
(UINTN)Guid->Data1,
(UINTN)Guid->Data2,
(UINTN)Guid->Data3,
(UINTN)Guid->Data4[0],
(UINTN)Guid->Data4[1],
(UINTN)Guid->Data4[2],
(UINTN)Guid->Data4[3],
(UINTN)Guid->Data4[4],
(UINTN)Guid->Data4[5],
(UINTN)Guid->Data4[6],
(UINTN)Guid->Data4[7]
);
//
// SPrint will null terminate the string. The -1 skips the null
//
return Size - 1;
}
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