#include "EncryptFile.h"

#include "File.h"
#include "FileSystem.h"

#define ENCRYPT_LEN (100)

NAMESPACE_MAS_BEGIN

TZ_INT EncryptFile::encryptXor(const std::string & inputPath)
{
	tzc::ExecPath path(inputPath);

	if (!path.IsExist())
	{
		TZLogInfo("file \"%s\" not found!!!\n", inputPath.c_str());
		return MEC_NULL_OBJ;
	}

	TZ_INT buffLen = path.GetFileSize() > ENCRYPT_LEN ? ENCRYPT_LEN : path.GetFileSize();

	tzc::PrimeFile f(inputPath);
	f.Open(tzc::File::FileOpenMode::OpenModeRead | tzc::File::FileOpenMode::OpenModeWrite
		| tzc::File::FileOpenMode::OpenModeBinary | tzc::File::FileOpenMode::OpenModeSync);

	TZ_BYTE pData[buffLen];
	f.Read(pData, buffLen);
	for (int i = 0; i < buffLen / 2; ++i)
	{
		pData[i] ^= (i & 1) ? 'c' : 'y';
		pData[buffLen - 1 - i] ^= (i & 1) ? 'c' : 'y';
		std::swap(pData[i], pData[buffLen - 1 - i]);
	}

	f.Seek(0, tzc::File::FileSeekPos::SeekPosSet);
	f.Write(pData, buffLen);
	f.Close();

	return MEC_OK;
}

TZ_INT EncryptFile::decryptXor(const std::string & inputPath)
{
	return EncryptFile::encryptXor(inputPath);
}

NAMESPACE_MAS_END