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reactos/dll/win32/mspatcha/mspatcha_main.c
Mark Jansen 97d7206f8b
[MSPATCHA] Initial patch decoding + applying. 
Some initial work is done, all testcases pass now.
However a lot of the patch format is still unknown / not working,
so do not expect anything other than the apitest to work yet.
The next thing to do now, is to gather input, output and patch files,
and analyze how the compression and patching works on bigger /
more complex files.
CORE-15417
2018-12-15 16:28:59 +01:00

631 lines
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/*
* PatchAPI
*
* Copyright 2011 David Hedberg for CodeWeavers
* Copyright 2018 Mark Jansen (mark.jansen@reactos.org)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "ndk/rtlfuncs.h"
#include "patchapi.h"
#include "lzx.h"
#include "wine/debug.h"
static const char szHexString[] = "0123456789abcdef";
#define SIGNATURE_MIN_SIZE 9
#define UNKNOWN_FLAGS_COMBINATION 0x00c40001
WINE_DEFAULT_DEBUG_CHANNEL(mspatcha);
typedef struct _SAFE_READ
{
PBYTE Root;
DWORD Size;
PBYTE Ptr;
} SAFE_READ, *PSAFE_READ;
/**
* @name ReadByte
* Read the next byte available from @param pRead
*
* @param pRead
* The input buffer
*
* @return The byte, or 0
*/
BYTE ReadByte(PSAFE_READ pRead)
{
if (pRead->Ptr + sizeof(BYTE) <= (pRead->Root + pRead->Size))
{
BYTE Value = *(PBYTE)pRead->Ptr;
pRead->Ptr += sizeof(BYTE);
return Value;
}
pRead->Ptr = pRead->Root + pRead->Size;
return 0;
}
/**
* @name ReadUShort
* Read the next unsigned short available from @param pRead
*
* @param pRead
* The input buffer
*
* @return The unsigned short, or 0
*/
USHORT ReadUShort(PSAFE_READ pRead)
{
if (pRead->Ptr + sizeof(USHORT) <= (pRead->Root + pRead->Size))
{
USHORT Value = *(PUSHORT)pRead->Ptr;
pRead->Ptr += sizeof(USHORT);
return Value;
}
pRead->Ptr = pRead->Root + pRead->Size;
return 0;
}
/**
* @name ReadDWord
* Read the next dword available from @param pRead
*
* @param pRead
* The input buffer
*
* @return The dword, or 0
*/
DWORD ReadDWord(PSAFE_READ pRead)
{
if (pRead->Ptr + sizeof(DWORD) <= (pRead->Root + pRead->Size))
{
DWORD Value = *(PDWORD)pRead->Ptr;
pRead->Ptr += sizeof(DWORD);
return Value;
}
pRead->Ptr = pRead->Root + pRead->Size;
return 0;
}
/**
* @name DecodeDWord
* Read the next variable length-encoded dword from @param pRead
*
* @param pRead
* The input buffer
*
* @return The dword, or 0
*/
DWORD DecodeDWord(PSAFE_READ pRead)
{
UINT Result = 0, offset;
for (offset = 0; offset < 32; offset += 7)
{
DWORD val = ReadByte(pRead);
Result |= ((val & 0x7f) << offset);
if (val & 0x80)
break;
}
return Result;
}
/**
* @name DecodeInt
* Read the next variable length-encoded int from @param pRead
*
* @param pRead
* The input buffer
*
* @return The int, or 0
*/
INT DecodeInt(PSAFE_READ pRead)
{
INT Result = 0, offset;
for (offset = 0; offset < 32; offset += 6)
{
INT val = (INT)(DWORD)ReadByte(pRead);
Result |= ((val & 0x3f) << offset);
if (val & 0x80)
{
if (val & 0x40)
Result *= -1;
break;
}
}
return Result;
}
typedef struct _PATCH_HEADER
{
DWORD Flags;
DWORD ImageBase;
DWORD ImageTimeStamp;
DWORD OutputSize;
DWORD OutputCrc;
DWORD OldSize;
DWORD OldCrc;
DWORD DataSize; // Payload after the patch header
} PATCH_HEADER;
/**
* @name MapFile
* Map a view of a file into readonly memory
*
* @param hFile
* The input file handle, readable
*
* @param dwSize
* Mapped file size (out)
*
* @return A Pointer to the start of the memory
*/
static PBYTE MapFile(HANDLE hFile, DWORD* dwSize)
{
HANDLE hMap;
PVOID pView;
*dwSize = GetFileSize(hFile, NULL);
hMap = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
if (hMap != INVALID_HANDLE_VALUE)
{
pView = MapViewOfFile(hMap, FILE_MAP_READ, 0, 0, 0);
CloseHandle(hMap);
return pView;
}
return NULL;
}
/*****************************************************
* DllMain (MSPATCHA.@)
*/
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH:
DisableThreadLibraryCalls(hinstDLL);
break;
}
return TRUE;
}
/*****************************************************
* ApplyPatchToFileA (MSPATCHA.1)
*/
BOOL WINAPI ApplyPatchToFileA(LPCSTR patch_file, LPCSTR old_file, LPCSTR new_file, ULONG apply_flags)
{
BOOL ret = FALSE;
HANDLE hPatch, hOld, hNew;
hPatch = CreateFileA(patch_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hPatch != INVALID_HANDLE_VALUE)
{
hOld = CreateFileA(old_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hOld != INVALID_HANDLE_VALUE)
{
hNew = CreateFileA(new_file, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (hNew != INVALID_HANDLE_VALUE)
{
ret = ApplyPatchToFileByHandles(hPatch, hOld, hNew, apply_flags);
CloseHandle(hNew);
}
CloseHandle(hOld);
}
CloseHandle(hPatch);
}
return ret;
}
/**
* @name ParseHeader
* Parse a Patch file header
* @note The current implementation is far from complete!
*
* @param Patch
* Buffer pointing to the raw patch data
*
* @param Header
* The result of the parsed header
*
* @return STATUS_SUCCESS on success, an error code otherwise
*/
DWORD ParseHeader(SAFE_READ* Patch, PATCH_HEADER* Header)
{
DWORD Crc, Unknown;
int Delta;
ZeroMemory(Header, sizeof(*Header));
/* Validate the patch */
Crc = RtlComputeCrc32(0, Patch->Root, Patch->Size);
if (Crc != ~0)
return ERROR_PATCH_CORRUPT;
if (ReadDWord(Patch) != '91AP')
return ERROR_PATCH_DECODE_FAILURE;
/* Read the flags, warn about an unknown combination */
Header->Flags = ReadDWord(Patch);
if (Header->Flags ^ UNKNOWN_FLAGS_COMBINATION)
ERR("Unknown flags: 0x%x, patch will most likely fail\n", Header->Flags ^ UNKNOWN_FLAGS_COMBINATION);
/* 0x5bb3284e, 0x5bb33562, 0x5bb357b1 */
Unknown = ReadDWord(Patch);
TRACE("Unknown: 0x%x\n", Unknown);
Header->OutputSize = DecodeDWord(Patch);
Header->OutputCrc = ReadDWord(Patch);
Unknown = ReadByte(Patch);
if (Unknown != 1)
ERR("Field after CRC is not 1 but %u\n", Unknown);
Delta = DecodeInt(Patch);
Header->OldSize = Header->OutputSize + Delta;
Header->OldCrc = ReadDWord(Patch);
Unknown = ReadUShort(Patch);
if (Unknown != 0)
ERR("Field1 after OldCrc is not 0 but %u\n", Unknown);
Unknown = DecodeDWord(Patch);
if (Unknown != 0)
ERR("Field2 after OldCrc is not 0 but %u\n", Unknown);
Header->DataSize = DecodeDWord(Patch);
/* Remaining data, minus the CRC appended */
if (Header->DataSize != (Patch->Size - (Patch->Ptr - Patch->Root) - sizeof(DWORD)))
{
ERR("Unable to read header, check previous logging!\n");
return ERROR_PATCH_DECODE_FAILURE;
}
return STATUS_SUCCESS;
}
/**
* @name CreateNewFileFromPatch
* Using the input @param Header and @param Patch, create a new file on @param new_file
*
* @param Header
* Parsed / preprocessed patch header
*
* @param Patch
* Memory buffer pointing to the patch payload
*
* @param new_file
* A handle to the output file. This file will be resized
*
* @return STATUS_SUCCESS on success, an error code otherwise
*/
DWORD CreateNewFileFromPatch(PATCH_HEADER* Header, SAFE_READ* Patch, HANDLE new_file)
{
SAFE_READ NewFile;
HANDLE hMap;
USHORT BlockSize;
DWORD dwStatus;
struct LZXstate* state;
int lzxResult;
hMap = CreateFileMappingW(new_file, NULL, PAGE_READWRITE, 0, Header->OutputSize, NULL);
if (hMap == INVALID_HANDLE_VALUE)
return ERROR_PATCH_NOT_AVAILABLE;
NewFile.Root = NewFile.Ptr = MapViewOfFile(hMap, FILE_MAP_WRITE, 0, 0, 0);
CloseHandle(hMap);
NewFile.Size = Header->OutputSize;
if (!NewFile.Root)
return ERROR_PATCH_NOT_AVAILABLE;
/* At this point Patch->Ptr should point to the payload */
BlockSize = ReadUShort(Patch);
/* This window size does not work on all files (for example, MS SQL Express 2008 setup) */
state = LZXinit(17);
if (state)
{
lzxResult = LZXdecompress(state, Patch->Ptr, NewFile.Ptr, BlockSize, NewFile.Size);
LZXteardown(state);
if (lzxResult == DECR_OK)
dwStatus = STATUS_SUCCESS;
else
dwStatus = ERROR_PATCH_DECODE_FAILURE;
}
else
{
dwStatus = ERROR_INSUFFICIENT_BUFFER;
}
UnmapViewOfFile(NewFile.Root);
return dwStatus;
}
/*****************************************************
* ApplyPatchToFileByHandles (MSPATCHA.2)
*/
BOOL WINAPI ApplyPatchToFileByHandles(HANDLE patch_file, HANDLE old_file, HANDLE new_file, ULONG apply_flags)
{
SAFE_READ Patch, OldFile;
DWORD dwStatus;
PATCH_HEADER Header;
Patch.Root = Patch.Ptr = MapFile(patch_file, &Patch.Size);
if (!Patch.Root)
{
SetLastError(ERROR_PATCH_CORRUPT);
return FALSE;
}
/* Let's decode the header */
dwStatus = ParseHeader(&Patch, &Header);
if (dwStatus != STATUS_SUCCESS)
{
UnmapViewOfFile(Patch.Root);
SetLastError(dwStatus);
return FALSE;
}
OldFile.Root = OldFile.Ptr = MapFile(old_file, &OldFile.Size);
if (OldFile.Root)
{
DWORD dwCrc;
/* Verify the input file */
dwCrc = RtlComputeCrc32(0, OldFile.Root, OldFile.Size);
if (OldFile.Size == Header.OldSize && dwCrc == Header.OldCrc)
{
if (apply_flags & APPLY_OPTION_TEST_ONLY)
dwStatus = STATUS_SUCCESS;
else
dwStatus = CreateNewFileFromPatch(&Header, &Patch, new_file);
}
else
{
dwStatus = ERROR_PATCH_WRONG_FILE;
}
UnmapViewOfFile(OldFile.Root);
}
else
{
dwStatus = GetLastError();
if (dwStatus == STATUS_SUCCESS)
dwStatus = ERROR_PATCH_NOT_AVAILABLE;
}
UnmapViewOfFile(Patch.Root);
SetLastError(dwStatus);
return dwStatus == STATUS_SUCCESS;
}
/*****************************************************
* ApplyPatchToFileW (MSPATCHA.6)
*/
BOOL WINAPI ApplyPatchToFileW(LPCWSTR patch_file, LPCWSTR old_file, LPCWSTR new_file, ULONG apply_flags)
{
BOOL ret = FALSE;
HANDLE hPatch, hOld, hNew;
hPatch = CreateFileW(patch_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hPatch != INVALID_HANDLE_VALUE)
{
hOld = CreateFileW(old_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hOld != INVALID_HANDLE_VALUE)
{
hNew = CreateFileW(new_file, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, NULL,
CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (hNew != INVALID_HANDLE_VALUE)
{
ret = ApplyPatchToFileByHandles(hPatch, hOld, hNew, apply_flags);
CloseHandle(hNew);
}
CloseHandle(hOld);
}
CloseHandle(hPatch);
}
return ret;
}
/*****************************************************
* GetFilePatchSignatureA (MSPATCHA.7)
*/
BOOL WINAPI GetFilePatchSignatureA(LPCSTR filename, ULONG flags, PVOID data, ULONG ignore_range_count,
PPATCH_IGNORE_RANGE ignore_range, ULONG retain_range_count,
PPATCH_RETAIN_RANGE retain_range, ULONG bufsize, PVOID buffer)
{
BOOL ret = FALSE;
HANDLE hFile;
hFile = CreateFileA(filename, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hFile != INVALID_HANDLE_VALUE)
{
ret = GetFilePatchSignatureByHandle(hFile, flags, data, ignore_range_count, ignore_range,
retain_range_count, retain_range, bufsize, buffer);
CloseHandle(hFile);
}
return ret;
}
/*****************************************************
* GetFilePatchSignatureA (MSPATCHA.7)
*/
BOOL WINAPI GetFilePatchSignatureByHandle(HANDLE hFile, ULONG flags, PVOID data, ULONG ignore_range_count,
PPATCH_IGNORE_RANGE ignore_range, ULONG retain_range_count,
PPATCH_RETAIN_RANGE retain_range, ULONG bufsize, PVOID buffer)
{
BOOL ret = FALSE;
DWORD dwSize, ulCrc;
PBYTE pData;
if (flags)
FIXME("Unhandled flags 0x%x\n", flags);
if (ignore_range_count)
FIXME("Unhandled ignore_range_count %u\n", ignore_range_count);
if (retain_range_count)
FIXME("Unhandled ignore_range_count %u\n", retain_range_count);
if ((pData = MapFile(hFile, &dwSize)))
{
if (dwSize >= 2 && *(PWORD)pData == IMAGE_DOS_SIGNATURE)
{
FIXME("Potentially unimplemented case, normalized signature\n");
}
ulCrc = RtlComputeCrc32(0, pData, dwSize);
if (bufsize >= SIGNATURE_MIN_SIZE)
{
char *pBuffer = buffer;
pBuffer[8] = '\0';
for (dwSize = 0; dwSize < 8; ++dwSize)
{
pBuffer[7 - dwSize] = szHexString[ulCrc & 0xf];
ulCrc >>= 4;
}
ret = TRUE;
}
UnmapViewOfFile(pData);
if (bufsize < SIGNATURE_MIN_SIZE)
SetLastError(ERROR_INSUFFICIENT_BUFFER);
}
return ret;
}
/*****************************************************
* GetFilePatchSignatureW (MSPATCHA.9)
*/
BOOL WINAPI GetFilePatchSignatureW(LPCWSTR filename, ULONG flags, PVOID data, ULONG ignore_range_count,
PPATCH_IGNORE_RANGE ignore_range, ULONG retain_range_count,
PPATCH_RETAIN_RANGE retain_range, ULONG bufsize, PVOID buffer)
{
CHAR LocalBuf[SIGNATURE_MIN_SIZE];
BOOL ret = FALSE;
HANDLE hFile;
hFile = CreateFileW(filename, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hFile != INVALID_HANDLE_VALUE)
{
ret = GetFilePatchSignatureByHandle(hFile, flags, data, ignore_range_count, ignore_range,
retain_range_count, retain_range, sizeof(LocalBuf), LocalBuf);
CloseHandle(hFile);
if (bufsize < (SIGNATURE_MIN_SIZE * sizeof(WCHAR)))
{
SetLastError(ERROR_INSUFFICIENT_BUFFER);
return FALSE;
}
if (ret)
{
MultiByteToWideChar(CP_ACP, 0, LocalBuf, -1, buffer, bufsize / sizeof(WCHAR));
}
}
return ret;
}
/*****************************************************
* TestApplyPatchToFileA (MSPATCHA.10)
*/
BOOL WINAPI TestApplyPatchToFileA(LPCSTR patch_file, LPCSTR old_file, ULONG apply_flags)
{
BOOL ret = FALSE;
HANDLE hPatch, hOld;
hPatch = CreateFileA(patch_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hPatch != INVALID_HANDLE_VALUE)
{
hOld = CreateFileA(old_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hOld != INVALID_HANDLE_VALUE)
{
ret = TestApplyPatchToFileByHandles(hPatch, hOld, apply_flags);
CloseHandle(hOld);
}
CloseHandle(hPatch);
}
return ret;
}
/*****************************************************
* TestApplyPatchToFileByHandles (MSPATCHA.11)
*/
BOOL WINAPI TestApplyPatchToFileByHandles(HANDLE patch_file, HANDLE old_file, ULONG apply_flags)
{
return ApplyPatchToFileByHandles(patch_file, old_file, INVALID_HANDLE_VALUE, apply_flags | APPLY_OPTION_TEST_ONLY);
}
/*****************************************************
* TestApplyPatchToFileW (MSPATCHA.12)
*/
BOOL WINAPI TestApplyPatchToFileW(LPCWSTR patch_file, LPCWSTR old_file, ULONG apply_flags)
{
BOOL ret = FALSE;
HANDLE hPatch, hOld;
hPatch = CreateFileW(patch_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hPatch != INVALID_HANDLE_VALUE)
{
hOld = CreateFileW(old_file, GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, 0);
if (hOld != INVALID_HANDLE_VALUE)
{
ret = TestApplyPatchToFileByHandles(hPatch, hOld, apply_flags);
CloseHandle(hOld);
}
CloseHandle(hPatch);
}
return ret;
}
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