mirror of
https://github.com/reactos/reactos.git
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117 lines
3 KiB
C
117 lines
3 KiB
C
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/*
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* PROJECT: ReactOS Setup Library
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* LICENSE: GPL-2.0+ (https://spdx.org/licenses/GPL-2.0+)
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* PURPOSE: BootCode support functions.
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* COPYRIGHT: Copyright 2020 Hermes Belusca-Maito
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*/
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/* INCLUDES *****************************************************************/
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#include "precomp.h"
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#include "bootcode.h"
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS ****************************************************************/
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NTSTATUS
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ReadBootCodeByHandle(
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IN OUT PBOOTCODE BootCodeInfo,
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IN HANDLE FileHandle,
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IN ULONG Length OPTIONAL)
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{
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NTSTATUS Status;
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PVOID BootCode;
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IO_STATUS_BLOCK IoStatusBlock;
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LARGE_INTEGER FileOffset;
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ASSERT(BootCodeInfo);
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/* Normalize the bootcode length */
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if (Length == 0 || Length == (ULONG)-1)
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Length = SECTORSIZE;
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/* Allocate a buffer for the bootcode */
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BootCode = RtlAllocateHeap(ProcessHeap, HEAP_ZERO_MEMORY, Length);
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if (BootCode == NULL)
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return STATUS_INSUFFICIENT_RESOURCES;
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/* Read the bootcode from the file into the buffer */
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FileOffset.QuadPart = 0ULL;
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Status = NtReadFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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BootCode,
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Length,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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RtlFreeHeap(ProcessHeap, 0, BootCode);
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return Status;
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}
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/* Update the bootcode information */
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if (BootCodeInfo->BootCode)
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RtlFreeHeap(ProcessHeap, 0, BootCodeInfo->BootCode);
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BootCodeInfo->BootCode = BootCode;
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/**/ BootCodeInfo->Length = Length; /**/
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return STATUS_SUCCESS;
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}
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NTSTATUS
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ReadBootCodeFromFile(
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IN OUT PBOOTCODE BootCodeInfo,
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IN PUNICODE_STRING FilePath,
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IN ULONG Length OPTIONAL)
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{
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NTSTATUS Status;
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OBJECT_ATTRIBUTES ObjectAttributes;
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IO_STATUS_BLOCK IoStatusBlock;
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HANDLE FileHandle;
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ASSERT(BootCodeInfo);
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/* Open the file */
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InitializeObjectAttributes(&ObjectAttributes,
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FilePath,
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OBJ_CASE_INSENSITIVE,
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NULL,
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NULL);
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Status = NtOpenFile(&FileHandle,
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GENERIC_READ | SYNCHRONIZE,
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&ObjectAttributes,
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&IoStatusBlock,
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FILE_SHARE_READ | FILE_SHARE_WRITE, // Is FILE_SHARE_WRITE necessary?
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FILE_SYNCHRONOUS_IO_NONALERT);
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if (!NT_SUCCESS(Status))
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return Status;
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Status = ReadBootCodeByHandle(BootCodeInfo, FileHandle, Length);
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/* Close the file and return */
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NtClose(FileHandle);
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return Status;
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}
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VOID
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FreeBootCode(
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IN OUT PBOOTCODE BootCodeInfo)
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{
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ASSERT(BootCodeInfo);
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/* Update the bootcode information */
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if (BootCodeInfo->BootCode)
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RtlFreeHeap(ProcessHeap, 0, BootCodeInfo->BootCode);
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BootCodeInfo->BootCode = NULL;
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/**/ BootCodeInfo->Length = 0; /**/
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}
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/* EOF */
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