Tenho seguinte código c++

char Filename[0x104];
char Drive[3];
char Dir[0x100];
char Destination[0x100];
char Source[0x14];
char FileName[0x104];
char* Block = nullptr;

// Get the full path of the module
GetModuleFileNameA(NULL, Filename, 0x104);
// Debug: Show the full module path
MessageBoxA(NULL, Filename, "Debug - Filename", MB_OK);

// Split the path into its components
_splitpath_s(Filename, Drive, 3, Dir, 0x100, Destination, 0x100, Source, 0x14);
// Debug: Show the path components
MessageBoxA(NULL, Drive, "Debug - Drive", MB_OK);
MessageBoxA(NULL, Dir, "Debug - Dir", MB_OK);
MessageBoxA(NULL, Destination, "Debug - Destination", MB_OK);
MessageBoxA(NULL, Source, "Debug - Source", MB_OK);

// Append the extension to the filename
strcat_s(Destination, 0x100, Source);
// Debug: Show the concatenated filename
MessageBoxA(NULL, Destination, "Debug - Concatenated Filename", MB_OK);

// Allocate memory
char* dword_100198F0 = (char*)malloc(0x104);
if (!dword_100198F0)
{
MessageBoxA(NULL, "Memory allocation failed for dword_100198F0", "Error", MB_OK);
return FALSE;
}

// Get the module file name again
GetModuleFileNameA(hModule, FileName, 0x104);
// Debug: Show the module filename
MessageBoxA(NULL, FileName, "Debug - Module Filename", MB_OK);

// Store the module filename into allocated memory
strcpy_s(dword_100198F0, 0x104, FileName);

// Open the module file
FILE* fp = fopen(FileName, "rb");
if (!fp)
{
// Display error message and exit if file cannot be opened
MessageBoxA(NULL, "Couldn't locate the client executable.", "GRF Encryption - File not found", MB_OK);
exit(1);
}

// Determine the file size
fseek(fp, 0, SEEK_END);
long fileSize = ftell(fp);
// Debug: Show the file size
{
char msg[256];
sprintf_s(msg, sizeof(msg), "File size: %ld bytes", fileSize);
MessageBoxA(NULL, msg, "Debug - File Size", MB_OK);
}
rewind(fp);

// Allocate memory for the file content
Block = (char*)malloc(fileSize);
if (!Block)
{
MessageBoxA(NULL, "Memory allocation failed for Block", "Error", MB_OK);
fclose(fp);
return FALSE;
}

// Read the entire file into Block
size_t bytesRead = fread(Block, 1, fileSize, fp);
fclose(fp);
// Debug: Show the number of bytes read
{
char msg[256];
sprintf_s(msg, sizeof(msg), "Bytes read: %zu bytes", bytesRead);
MessageBoxA(NULL, msg, "Debug - Bytes Read", MB_OK);
}

// Prepare to search for the pattern "NUMBER"
const char pattern[] = "NUMBER";
long matchPos = -1;
for (long i = 0; i <= fileSize - (long)(sizeof(pattern) - 1); i++)
{
if (memcmp(Block + i, pattern, sizeof(pattern) - 1) == 0)
{
matchPos = i;
break;
}
}

// Debug: Show if the pattern was found
if (matchPos == -1)
{
MessageBoxA(NULL, "Pattern 'NUMBER' not found in Block", "Debug - Pattern Search", MB_OK);
}
else
{
char msg[256];
sprintf_s(msg, sizeof(msg), "Pattern 'NUMBER' found at position: %ld", matchPos);
MessageBoxA(NULL, msg, "Debug - Pattern Found", MB_OK);
}

if (matchPos == -1)
{
free(Block);
break;
}

// Copy data starting from matchPos + 14 into var_334
char var_334[0x108];
memcpy(var_334, Block + matchPos + 14, 0x108);
// Debug: Show that data was copied into var_334
MessageBoxA(NULL, "Copied data into var_334", "Debug", MB_OK);

// Copy dword_100198F0 into Src
char Src[0x104];
memcpy(Src, dword_100198F0, 0x104);
// Debug: Show that data was copied into Src
MessageBoxA(NULL, "Copied data into Src", "Debug", MB_OK);

// Copy data from var_334 into var_12C
char var_12C[0x104];
memcpy(var_12C, var_334 + 0x104, 0x104); // Adjusted offset based on var_334 size
// Debug: Show that data was copied into var_12C
MessageBoxA(NULL, "Copied data into var_12C", "Debug", MB_OK);

// Invert each byte in var_12C
for (int i = 0; i < 0x104; i++)
{
var_12C[i] = ~var_12C[i];
}
// Debug: Show that bytes in var_12C were inverted
MessageBoxA(NULL, "Inverted bytes in var_12C", "Debug", MB_OK);

// Free the Block memory
free(Block);
// Debug: Indicate that Block memory was freed
MessageBoxA(NULL, "Freed Block memory", "Debug", MB_OK);

// Open the file specified by var_12C
MessageBoxA(NULL, var_12C, "GRF Encryption - File not found", MB_OK);
fp = fopen(var_12C, "rb");
if (!fp)
{
// Display error message and exit if file cannot be opened
MessageBoxA(NULL, "Couldn't locate the client executable.", "GRF Encryption - File not found", MB_OK);
exit(1);
}
fclose(fp);
// Debug: Indicate that the file specified by var_12C exists
MessageBoxA(NULL, "Verified existence of client executable", "Debug", MB_OK);

pela logica o que seria a var_12C