mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-27 12:15:19 +01:00
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
/** @file
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Copyright (C) 2019, vit9696. All rights reserved.
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All rights reserved.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Library/BaseLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/OcMiscLib.h>
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INT32
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FindPattern (
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IN CONST UINT8 *Pattern,
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IN CONST UINT8 *PatternMask OPTIONAL,
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IN CONST UINT32 PatternSize,
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IN CONST UINT8 *Data,
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IN UINT32 DataSize,
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IN INT32 DataOff
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)
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{
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BOOLEAN Matches;
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UINT32 Index;
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ASSERT (DataOff >= 0);
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if (PatternSize == 0 || DataSize == 0 || (DataOff < 0) || (UINT32)DataOff >= DataSize || DataSize - DataOff < PatternSize) {
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return -1;
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}
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while (DataOff + PatternSize < DataSize) {
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Matches = TRUE;
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for (Index = 0; Index < PatternSize; ++Index) {
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if ((PatternMask == NULL && Data[DataOff + Index] != Pattern[Index])
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|| (PatternMask != NULL && (Data[DataOff + Index] & PatternMask[Index]) != Pattern[Index])) {
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Matches = FALSE;
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break;
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}
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}
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if (Matches) {
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return DataOff;
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}
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++DataOff;
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}
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return -1;
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}
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UINT32
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ApplyPatch (
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IN CONST UINT8 *Pattern,
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IN CONST UINT8 *PatternMask OPTIONAL,
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IN CONST UINT32 PatternSize,
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IN CONST UINT8 *Replace,
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IN CONST UINT8 *ReplaceMask OPTIONAL,
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IN UINT8 *Data,
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IN UINT32 DataSize,
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IN UINT32 Count,
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IN UINT32 Skip
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)
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{
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UINT32 ReplaceCount;
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INT32 DataOff;
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ReplaceCount = 0;
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DataOff = 0;
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do {
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DataOff = FindPattern (Pattern, PatternMask, PatternSize, Data, DataSize, DataOff);
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if (DataOff >= 0) {
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//
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// Skip this finding if requested.
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//
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if (Skip > 0) {
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--Skip;
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DataOff += PatternSize;
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continue;
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}
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//
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// Perform replacement.
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//
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if (ReplaceMask == NULL) {
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CopyMem (&Data[DataOff], Replace, PatternSize);
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} else {
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for (UINTN Index = 0; Index < PatternSize; ++Index) {
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Data[DataOff + Index] = (Data[DataOff + Index] & ~ReplaceMask[Index]) | (Replace[Index] & ReplaceMask[Index]);
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}
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}
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++ReplaceCount;
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DataOff += PatternSize;
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//
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// Check replace count if requested.
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//
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if (Count > 0) {
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--Count;
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if (Count == 0) {
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break;
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}
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}
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}
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} while (DataOff >= 0);
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return ReplaceCount;
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}
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