mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-29 12:35:53 +01:00
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/** @file
|
|
Disk utilities
|
|
|
|
Copyright (c) 2021 Pedro Falcato All rights reserved.
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
#include "Ext4Dxe.h"
|
|
|
|
/**
|
|
Reads from the partition's disk using the DISK_IO protocol.
|
|
|
|
@param[in] Partition Pointer to the opened ext4 partition.
|
|
@param[out] Buffer Pointer to a destination buffer.
|
|
@param[in] Length Length of the destination buffer.
|
|
@param[in] Offset Offset, in bytes, of the location to read.
|
|
|
|
@return Success status of the disk read.
|
|
**/
|
|
EFI_STATUS
|
|
Ext4ReadDiskIo (
|
|
IN EXT4_PARTITION *Partition,
|
|
OUT VOID *Buffer,
|
|
IN UINTN Length,
|
|
IN UINT64 Offset
|
|
)
|
|
{
|
|
return EXT4_DISK_IO (Partition)->ReadDisk (
|
|
EXT4_DISK_IO (Partition),
|
|
EXT4_MEDIA_ID (Partition),
|
|
Offset,
|
|
Length,
|
|
Buffer
|
|
);
|
|
}
|
|
|
|
/**
|
|
Reads blocks from the partition's disk using the DISK_IO protocol.
|
|
|
|
@param[in] Partition Pointer to the opened ext4 partition.
|
|
@param[out] Buffer Pointer to a destination buffer.
|
|
@param[in] NumberBlocks Length of the read, in filesystem blocks.
|
|
@param[in] BlockNumber Starting block number.
|
|
|
|
@return Success status of the read.
|
|
**/
|
|
EFI_STATUS
|
|
Ext4ReadBlocks (
|
|
IN EXT4_PARTITION *Partition,
|
|
OUT VOID *Buffer,
|
|
IN UINTN NumberBlocks,
|
|
IN EXT4_BLOCK_NR BlockNumber
|
|
)
|
|
{
|
|
UINT64 Offset;
|
|
UINTN Length;
|
|
|
|
ASSERT (NumberBlocks != 0);
|
|
ASSERT (BlockNumber != EXT4_BLOCK_FILE_HOLE);
|
|
|
|
Offset = MultU64x32 (BlockNumber, Partition->BlockSize);
|
|
Length = NumberBlocks * Partition->BlockSize;
|
|
|
|
// Check for overflow on the block -> byte conversions.
|
|
// Partition->BlockSize is never 0, so we don't need to check for that.
|
|
|
|
if (DivU64x64Remainder (Offset, BlockNumber, NULL) != Partition->BlockSize) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
if (Length / NumberBlocks != Partition->BlockSize) {
|
|
return EFI_INVALID_PARAMETER;
|
|
}
|
|
|
|
return Ext4ReadDiskIo (Partition, Buffer, Length, Offset);
|
|
}
|
|
|
|
/**
|
|
Allocates a buffer and reads blocks from the partition's disk using the DISK_IO protocol.
|
|
This function is deprecated and will be removed in the future.
|
|
|
|
@param[in] Partition Pointer to the opened ext4 partition.
|
|
@param[in] NumberBlocks Length of the read, in filesystem blocks.
|
|
@param[in] BlockNumber Starting block number.
|
|
|
|
@return Buffer allocated by AllocatePool, or NULL if some part of the process
|
|
failed.
|
|
**/
|
|
VOID *
|
|
Ext4AllocAndReadBlocks (
|
|
IN EXT4_PARTITION *Partition,
|
|
IN UINTN NumberBlocks,
|
|
IN EXT4_BLOCK_NR BlockNumber
|
|
)
|
|
{
|
|
VOID *Buf;
|
|
UINTN Length;
|
|
|
|
// Check that number of blocks isn't empty, because
|
|
// this is incorrect condition for opened partition,
|
|
// so we just early-exit
|
|
if ((NumberBlocks == 0) || (BlockNumber == EXT4_BLOCK_FILE_HOLE)) {
|
|
return NULL;
|
|
}
|
|
|
|
Length = NumberBlocks * Partition->BlockSize;
|
|
|
|
// Check for integer overflow
|
|
if (Length / NumberBlocks != Partition->BlockSize) {
|
|
return NULL;
|
|
}
|
|
|
|
Buf = AllocatePool (Length);
|
|
if (Buf == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
if (Ext4ReadBlocks (Partition, Buf, NumberBlocks, BlockNumber) != EFI_SUCCESS) {
|
|
FreePool (Buf);
|
|
return NULL;
|
|
}
|
|
|
|
return Buf;
|
|
}
|