#include "stdafx.h"
#include <Windows.h>
#include <tchar.h>

#define MAX_SIZE 512

int EncodeQuoted(const unsigned char* pSrc, char* pDst, int nSrcLen, int nMaxLineLen);
int DecodeQuoted(const char* pSrc, unsigned char* pDst, int nSrcLen);

int _tmain(int argc, TCHAR *argv[])
{
	//MessageBox(NULL, L"a", L"a", MB_OK);
	BOOL bAction;
//  	TCHAR tFileName = TEXT("a.txt");
// 	TCHAR tWriteFile = "b.txt";
	char *pcBuffer = new char[MAX_SIZE];
	unsigned char *pDst = new unsigned char[MAX_SIZE];
	DWORD dwNumBytes = 0;
	DWORD dwFileSize = 0;
	HANDLE hFile = CreateFile(argv[1], GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
	if(hFile == INVALID_HANDLE_VALUE)
	{
		printf("file create error (error %d)\n", GetLastError());
		delete pcBuffer;
		delete pDst;
		pcBuffer = NULL;
		pDst = NULL;
		return 0;
	}
//	GetFileSize(hFile, &dwFileSize);
	bAction = ReadFile(hFile, pcBuffer, MAX_SIZE, &dwNumBytes, NULL);
	//printf("bAction is %d\n", bAction);
	if(!bAction)
	{
		printf("file read error(error %d)\n", GetLastError());
		delete pcBuffer;
		delete pDst;
		pDst = NULL;
		pcBuffer = NULL;
		CloseHandle(hFile);
		return 0;
	}
	dwFileSize = DecodeQuoted(pcBuffer, pDst, dwNumBytes);
	if(dwFileSize <= 0)
	{
		printf("dwFileSize is 0\n");
		return 0;
	}
	dwNumBytes = 0;
	delete pcBuffer;
	pcBuffer = NULL;
	CloseHandle(hFile);
	HANDLE hWriteFile = CreateFile(argv[2], GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL);
	if(hWriteFile == INVALID_HANDLE_VALUE)
	{
		printf("write file create error(error %d)\n", GetLastError());
		delete pDst;
		pDst = NULL;
		return 0;
	}
	bAction = WriteFile(hWriteFile, pDst, dwFileSize, &dwNumBytes, NULL);
	/*if(!bAction)
	{*/
		printf("write file write error(error %d)\n", GetLastError());
		delete pDst;
		pDst = NULL;
		CloseHandle(hWriteFile);
		return 0;
	//}
	//return 0;
}

int EncodeQuoted(const unsigned char* pSrc, char* pDst, int nSrcLen, int nMaxLineLen)
{
	int nDstLen;        // 输出的字符计数
	int nLineLen;       // 输出的行长度计数
	nDstLen = 0;
	nLineLen = 0;
	
	for (int i = 0; i < nSrcLen; i++, pSrc++)
	{
		// ASCII 33-60, 62-126原样输出，其余的需编码
		if ((*pSrc >= '!') && (*pSrc <= '~') && (*pSrc != '='))
		{
			*pDst++ = (char)*pSrc;
			nDstLen++;
			nLineLen++;
		}
		else
		{
			sprintf_s(pDst, MAX_SIZE, "=%02X", *pSrc);
			pDst += 3;
			nDstLen += 3;
			nLineLen += 3;
		}
		// 输出换行？
		if (nLineLen >= nMaxLineLen - 3)
		{
			sprintf_s(pDst, MAX_SIZE, "=\r\n");
			pDst += 3;
			nDstLen += 3;
			nLineLen = 0;
		}
	}
	// 输出加个结束符
	*pDst = '\0';
	return nDstLen;
}

//Quoted-Printable解码很简单，将编码过程反过来就行了。 
int DecodeQuoted(const char* pSrc, unsigned char* pDst, int nSrcLen)
{
	int nDstLen;        // 输出的字符计数
	int i;
	i = 0;
	nDstLen = 0;
	while (i < nSrcLen)
	{
		if (strncmp(pSrc, "=\r\n", 3) == 0)        // 软回车，跳过
		{
			pSrc += 3;
			i += 3;
		}
		else
		{
			if (*pSrc == '=')        // 是编码字节
			{
				sscanf_s(pSrc, "=%02X", pDst);
				pDst++;
				pSrc += 3;
				i += 3;
			}
			else        // 非编码字节
			{
				*pDst++ = (unsigned char)*pSrc++;
				i++;
			}
			nDstLen++;
		}
	}
	// 输出加个结束符
//	*pDst = '\0';
	return nDstLen;
}

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