mirror of
https://github.com/dashr9230/SA-MP.git
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129 lines
2.8 KiB
C++
129 lines
2.8 KiB
C++
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#include <windows.h>
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#include "filechecks.h"
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#include "filehooks.h"
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#include "../saco/filesystem.h"
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#include "../saco/archive/archivefs.h" // The new FileSystem
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#include "md5.h"
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extern CFileSystem *pFileSystem;
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DWORD WINAPI Arch_SetFilePointer( HANDLE hFile,LONG lDistanceToMove,
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PLONG lpDistanceToMoveHigh,DWORD dwMoveMethod );
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BOOL WINAPI Arch_ReadFile( HANDLE hFile,LPVOID lpBuffer,
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DWORD nNumberOfBytesToRead,
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LPDWORD lpNumberOfBytesRead,
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LPOVERLAPPED lpOverlapped );
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BOOL IsCheckableFile(CHAR* szExt)
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{
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// Obfuscate the code in the dll slightly to make tracing it harder
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// very hard coded and messy but should detect ide and ipl case insensitively
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if ((*szExt++ & 0xDF) != 'I') return FALSE;
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if ((*szExt | 0x20) + 7 != 'k')
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{
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if ((*szExt & 0xDF) - 17 == '?')
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{
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szExt++;
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if (((*szExt | 0x20) - 'k') == 1) return TRUE;
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}
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}
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else
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{
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if (((*++szExt & 0xDF) - 'E')) return FALSE;
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return TRUE;
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}
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return FALSE;
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}
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void CheckFileHash(int dwFileHash, HANDLE hFile)
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{
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DWORD dwFileIndex = ((CArchiveFS*)pFileSystem)->GetFileIndex(0xa848b69a);
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if (dwFileIndex != FS_INVALID_FILE)
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{
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BYTE *pbData = pFileSystem->GetFileData(dwFileIndex);
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BYTE byteCount = *pbData++; // Get and jump over header
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// Search the tree
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BOOL bFound = FALSE;
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BYTE i = 0;
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BINARY_TREE* pItem;
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while(!bFound && i < byteCount)
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{
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pItem = (BINARY_TREE*)(pbData + (i * sizeof (BINARY_TREE)));
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if (pItem->dwFileHash == dwFileHash)
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{
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i = pItem->byteData;
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bFound = TRUE;
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}
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else if (pItem->dwFileHash < dwFileHash)
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{
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i = pItem->byteRight;
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}
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else
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{
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i = pItem->byteLeft;
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}
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}
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#ifndef _DEBUG
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if (i >= byteCount)
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{
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return;
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}
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#endif
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// Jump over the header and tree blocks into the data block
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MD5_DATA* mdHash = (MD5_DATA*)(pbData + (byteCount * sizeof (BINARY_TREE)) + (i * sizeof (MD5_DATA)));
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DWORD dwWasRead;
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BYTE szBuffer[1024];
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MD5_CTX mdCTX;
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MD5Init(&mdCTX);
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DWORD dwDataToRead = 1024;
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while (Arch_ReadFile(hFile, (LPVOID)szBuffer, dwDataToRead, &dwWasRead, NULL) && dwWasRead)
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{
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MD5Update(&mdCTX, szBuffer, dwWasRead);
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}
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BYTE byteDigest[16];
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MD5Final(byteDigest, &mdCTX);
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LONG lDistanceHigh = 0;
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Arch_SetFilePointer(hFile, 0, &lDistanceHigh, FILE_BEGIN);
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for (i = 0; i < 16; i++)
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{
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if ((BYTE)byteDigest[i] != (BYTE)mdHash->byteData[i])
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{
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#ifndef _DEBUG
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break;
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#endif
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}
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}
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}
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}
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int GetFileNameHash(char* szFileName)
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{
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// Based on a Jenkins hash
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int dwHash = 0;
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char* len = strlen(szFileName) + szFileName;
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while (szFileName < len)
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{
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char c = *szFileName;
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dwHash += (c > 'Z' || c < 'A') ? (c) : (c | 0x20); // Lower case
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dwHash += (dwHash << 10);
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dwHash ^= (dwHash >> 6);
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szFileName++;
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}
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dwHash += (dwHash << 3);
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dwHash ^= (dwHash >> 11);
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dwHash += (dwHash << 15);
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return dwHash;
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}
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