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#include "PatternFind.h"
#include <dbghelp.h>
#include <psapi.h>
#pragma comment(lib, "dbghelp")
#pragma comment(lib, "psapi")
BOOL GetModuleSize(HMODULE hModule, LPVOID* lplpBase, LPDWORD lpdwSize) {
if (hModule == GetModuleHandle(NULL)) {
PIMAGE_NT_HEADERS pImageNtHeaders = ImageNtHeader((PVOID)hModule);
if (pImageNtHeaders == NULL)
return FALSE;
*lplpBase = (LPVOID)hModule;
*lpdwSize = pImageNtHeaders->OptionalHeader.SizeOfImage;
} else {
MODULEINFO ModuleInfo;
if (!GetModuleInformation(GetCurrentProcess(), hModule, &ModuleInfo, sizeof(MODULEINFO)))
return FALSE;
*lplpBase = ModuleInfo.lpBaseOfDll;
*lpdwSize = ModuleInfo.SizeOfImage;
}
return TRUE;
}
DWORD PFAPI GetPatternCB(char *szPattern) {
DWORD cb = 0;
bool first_nibble = false;
for (DWORD i=0; i<strlen(szPattern); i++) {
char c = toupper(szPattern[i]);
if (c != ' ') {
if (c == '?') {
if (!first_nibble) cb++;
else return 0;
} else {
if (!isxdigit(c)) return 0;
if (first_nibble) cb++;
first_nibble ^= true;
}
}
}
if (first_nibble) return 0;
return cb;
}
BOOL PFAPI GeneratePatternMask(char *szPattern, char *buffer) {
bool first_nibble = false;
for (DWORD i=0; i<strlen(szPattern); i++) {
char c = toupper(szPattern[i]);
if (c != ' ') {
if (c == '?') {
if (!first_nibble) strcat_s(buffer, MAX_PATTERN, "?");
else return FALSE;
} else {
if (!isxdigit(c)) return FALSE;
if (first_nibble) strcat_s(buffer, MAX_PATTERN, "x");
first_nibble ^= true;
}
}
}
if (first_nibble) return FALSE;
return TRUE;
}
BOOL PFAPI GeneratePatternBytes(char *szPattern, LPBYTE buffer) {
bool first_nibble = false;
DWORD cb = 0;
for (DWORD i=0; i<strlen(szPattern); i++) {
char c = toupper(szPattern[i]);
if (c != ' ') {
if (c == '?') {
if (!first_nibble) {
buffer[cb] = 0x00;
cb++;
}
else return FALSE;
} else {
if (!isxdigit(c)) return FALSE;
if (first_nibble) {
char byte[3] = {0};
byte[0] = szPattern[i-1];
byte[1] = c;
byte[2] = '\0';
buffer[cb] = (BYTE)strtol(byte, NULL, 16);
cb++;
}
first_nibble ^= true;
}
}
}
if (first_nibble) return FALSE;
return TRUE;
}
VOID PFAPI SearchPattern(PFSEARCH *ppf, LPVOID lpvBase, DWORD dwSize) {
ppf->lpvResult = 0;
DWORD dwBase = reinterpret_cast<DWORD>(lpvBase);
for (DWORD i=dwBase; i<dwBase+dwSize; i++) {
bool found = true;
for (DWORD j=0; j<ppf->dwLength; j++) {
if (ppf->szMask[j] == 'x') {
if (*reinterpret_cast<BYTE*>(i+j) != ppf->lpbData[j]) {
found = false;
break;
}
}
}
if (found) {
ppf->lpvResult = reinterpret_cast<LPVOID>(i);
return;
}
}
}
DWORD PFAPI FindPattern(char *szPattern, PFSEARCH *ppf, LPVOID lpvBase, DWORD dwSize) {
ZeroMemory(ppf, sizeof(PFSEARCH));
bool invalid = false;
ppf->dwLength = GetPatternCB(szPattern);
invalid = invalid || !ppf->dwLength;
invalid = invalid || !GeneratePatternMask(szPattern, ppf->szMask);
invalid = invalid || !GeneratePatternBytes(szPattern, ppf->lpbData);
if (invalid)
return PF_INVALID;
if (ppf->dwLength > MAX_PATTERN)
return PF_OVERFLOW;
SearchPattern(ppf, lpvBase, dwSize);
if (!ppf->lpvResult)
return PF_NOT_FOUND;
return PF_NONE;
}
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