LZO词典压缩器实现（含界面）

1、界面效果：

   （测试）压缩结果：

    

    （测试）解压缩结果：

2、关键实现代码

（1）选择待压缩文件按钮

void CcompressDlg::OnBnClickedButton3(){// TODO: 在此添加控件通知处理程序代码CString strFile = _T("");CFileDialog    dlgFile(TRUE, NULL, NULL, OFN_HIDEREADONLY, _T("Describe Files (*.cfg)|*.cfg|All Files (*.*)|*.*||"), NULL);if (dlgFile.DoModal()){strFile = dlgFile.GetPathName();}UpdateData(true);          // 获取数据path = strFile;UpdateData(false);         // 更新数据}

（2）选择解压缩文件按钮

void CcompressDlg::OnBnClickedButton4(){// TODO: 在此添加控件通知处理程序代码CString strFile = _T("");CFileDialog    dlgFile(TRUE, NULL, NULL, OFN_HIDEREADONLY, _T("Describe Files (*.cfg)|*.cfg|All Files (*.*)|*.*||"), NULL);if (dlgFile.DoModal()){strFile = dlgFile.GetPathName();}UpdateData(true);          // 获取数据path_decompress = strFile;UpdateData(false);         // 更新数据}

（3）压缩按钮

void CcompressDlg::OnBnClickedButton1(){// TODO: 在此添加控件通知处理程序代码#ifdef _UNICODELONG len1;len1 = WideCharToMultiByte(CP_ACP, 0, path, -1, NULL, 0, NULL, NULL);char *textPath = (char *)malloc(sizeof(char)*(len1 + 1));memset(textPath, 0, len1 + 1);WideCharToMultiByte(CP_ACP, 0, path, -1, textPath, len1 + 1, NULL, NULL);#elseptr = new char[str.GetAllocLength() + 1];#endiferr = fopen_s(&ifp, textPath, "rb");if (err == 0){printf("Thefile'crt_fopen_s.c'wasopened\n");}fseek(ifp, 0, SEEK_END);unsigned long len = ftell(ifp);myInLen = len;fseek(ifp, 0, SEEK_SET);cpTemp = (char*)malloc(len * sizeof(char));fread(cpTemp, sizeof(char), len, ifp);char *in = cpTemp;char *out = (char*)malloc((len + len / 16 + 64 + 3) * sizeof(char));if (lzo_init() != LZO_E_OK){printf("internal error - lzo_init() failed !!!\n");printf("(this usually indicates a compiler bug - try recompiling\nwithout optimizations, and enable '-DLZO_DEBUG' for diagnostics)\n");}lzo_uint in_len;in_len = len;lzo_memset(in, 0, in_len);lzo_uint out_len;int r;r = lzo1x_1_compress((unsigned char*)in, in_len, (unsigned char*)out, &out_len, wrkmem);char mess[256];if (r == LZO_E_OK){sprintf_s(mess, sizeof(mess),  "压缩成功！\n\n原文件大小：%lu bytes\n压缩后大小：%lu bytes\n\n解压得到的文件“compress.txt”保存于工程目录下",(unsigned long)in_len, (unsigned long)out_len);MessageBox(CString(mess));}else{/* this should NEVER happen */sprintf_s(mess, sizeof(mess), "压缩失败!\n %d\n", r);MessageBox(CString(mess));}/* check for an incompressible block */if (out_len >= in_len){sprintf_s(mess, sizeof(mess), "未压缩！\n");MessageBox(CString(mess));}err = fopen_s(&ofp, ".\\compress.txt", "wb");fwrite(out, sizeof(char), out_len, ofp);fclose(ifp);fclose(ofp);free(cpTemp);free(out);free(textPath);}

（4）解压缩按钮

void CcompressDlg::OnBnClickedButton2(){// TODO: 在此添加控件通知处理程序代码#ifdef _UNICODELONG len1;len1 = WideCharToMultiByte(CP_ACP, 0, path_decompress, -1, NULL, 0, NULL, NULL);char *textPath = (char *)malloc(sizeof(char)*(len1 + 1));memset(textPath, 0, len1 + 1);WideCharToMultiByte(CP_ACP, 0, path_decompress, -1, textPath, len1 + 1, NULL, NULL);#elseptr = new char[str.GetAllocLength() + 1];#endiferr = fopen_s(&ifp, textPath, "rb");if (err == 0){printf("Thefile'crt_fopen_s.c'was opened\n");}fseek(ifp, 0, SEEK_END);unsigned long len = ftell(ifp);fseek(ifp, 0, SEEK_SET);cpTemp = (char*)malloc(len * sizeof(char));fread(cpTemp, sizeof(char), len, ifp);char *in = cpTemp;char *out = (char *)malloc(len*100* sizeof(char));memset(out, 0, len * 100 * sizeof(char));int r;lzo_uint new_len;r = lzo1x_decompress((unsigned char*)in, len, (unsigned char*)out, &new_len, NULL);char mess[256];if (r == LZO_E_OK && new_len == myInLen){sprintf_s(mess, sizeof(mess), "解压成功！\n\n待解压文件大小： %lu bytes\n解压后文件大小： %lu bytes\n\n解压得到的文件“decompress.txt”保存于工程目录下",(unsigned long)len, (unsigned long)new_len);MessageBox(CString(mess));}else{/* this should NEVER happen */sprintf_s(mess, sizeof(mess), "解压失败！ %d\n", r);MessageBox(CString(mess));}err = fopen_s(&ofp, ".\\decompress.txt", "wt+");fwrite(out, sizeof(char), new_len, ofp);fclose(ifp);fclose(ofp);free(cpTemp);free(textPath);free(out);}

（5）LZO压缩算法

       代码下载：http://www.oberhumer.com/opensource/lzo/