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/** @file
Helper functions for SecureBoot configuration module.
Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "SecureBootConfigImpl.h"
/**
Read file content into BufferPtr, the size of the allocate buffer
is *FileSize plus AddtionAllocateSize.
@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] AddtionAllocateSize Addtion 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 AddtionAllocateSize
)
{
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 + AddtionAllocateSize;
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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