mainform.cs

通过bmp图片格式进行数据加密

using System;
using System.IO;
using System.Text;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace bmpFormat
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class MainForm : System.Windows.Forms.Form
	{

		// user params
		//private String m_sPath;

		//sys params
		private System.Windows.Forms.Button EncodeBmp;
		private System.Windows.Forms.Button DecodeBmp;
		private System.Windows.Forms.TextBox CodeText;
		private System.Windows.Forms.TextBox tbBmp;
		private System.Windows.Forms.Button OpenBmp;
		private System.Windows.Forms.OpenFileDialog oFDialogBmp;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public MainForm()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.EncodeBmp = new System.Windows.Forms.Button();
			this.DecodeBmp = new System.Windows.Forms.Button();
			this.CodeText = new System.Windows.Forms.TextBox();
			this.tbBmp = new System.Windows.Forms.TextBox();
			this.OpenBmp = new System.Windows.Forms.Button();
			this.oFDialogBmp = new System.Windows.Forms.OpenFileDialog();
			this.SuspendLayout();
			// 
			// EncodeBmp
			// 
			this.EncodeBmp.Enabled = false;
			this.EncodeBmp.Location = new System.Drawing.Point(344, 8);
			this.EncodeBmp.Name = "EncodeBmp";
			this.EncodeBmp.Size = new System.Drawing.Size(80, 24);
			this.EncodeBmp.TabIndex = 0;
			this.EncodeBmp.Text = "加密";
			this.EncodeBmp.Click += new System.EventHandler(this.EncodeBmp_Click);
			// 
			// DecodeBmp
			// 
			this.DecodeBmp.Enabled = false;
			this.DecodeBmp.Location = new System.Drawing.Point(432, 8);
			this.DecodeBmp.Name = "DecodeBmp";
			this.DecodeBmp.Size = new System.Drawing.Size(80, 24);
			this.DecodeBmp.TabIndex = 1;
			this.DecodeBmp.Text = "解密";
			this.DecodeBmp.Click += new System.EventHandler(this.DecodeBmp_Click);
			// 
			// CodeText
			// 
			this.CodeText.Location = new System.Drawing.Point(16, 40);
			this.CodeText.MaxLength = 65535;
			this.CodeText.Multiline = true;
			this.CodeText.Name = "CodeText";
			this.CodeText.ScrollBars = System.Windows.Forms.ScrollBars.Both;
			this.CodeText.Size = new System.Drawing.Size(496, 312);
			this.CodeText.TabIndex = 2;
			this.CodeText.Text = "";
			// 
			// tbBmp
			// 
			this.tbBmp.Location = new System.Drawing.Point(16, 8);
			this.tbBmp.Name = "tbBmp";
			this.tbBmp.ReadOnly = true;
			this.tbBmp.Size = new System.Drawing.Size(240, 21);
			this.tbBmp.TabIndex = 3;
			this.tbBmp.Text = "";
			// 
			// OpenBmp
			// 
			this.OpenBmp.Location = new System.Drawing.Point(264, 8);
			this.OpenBmp.Name = "OpenBmp";
			this.OpenBmp.Size = new System.Drawing.Size(72, 24);
			this.OpenBmp.TabIndex = 4;
			this.OpenBmp.Text = "打开";
			this.OpenBmp.Click += new System.EventHandler(this.OpenBmp_Click);
			// 
			// oFDialogBmp
			// 
			this.oFDialogBmp.Filter = "Bmp文件|*.bmp";
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(528, 365);
			this.Controls.Add(this.OpenBmp);
			this.Controls.Add(this.tbBmp);
			this.Controls.Add(this.CodeText);
			this.Controls.Add(this.DecodeBmp);
			this.Controls.Add(this.EncodeBmp);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
			this.Name = "MainForm";
			this.Text = "BMP格式应用";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new MainForm());
		}

		/// <summary>
		/// 错误日志
		/// </summary>
		/// <param name="szMsg">记录信息</param>
		public void logs(string szMsg)
		{
			DateTime dt=DateTime.Now;
			String szFile=string.Format("./logs/log{0}.log", DateTime.Now.ToLongDateString());
			lock(typeof(MainForm))
			{
				using (StreamWriter sw = new StreamWriter(szFile, true)) 
				{
					sw.WriteLine(string.Format("[{0}]:{1}",DateTime.Now, szMsg));
				}
			}
		}


		private void ExtendBmp(String FILE_NAME, String FILE_NAME2)
		{
			try 
			{
				if (!File.Exists(FILE_NAME)) 
				{
					MessageBox.Show(String.Format("{0} file not exists!", FILE_NAME));
					return;
				}

				FileStream fsi = new FileStream(FILE_NAME, FileMode.Open, FileAccess.Read);
				BinaryReader r = new BinaryReader(fsi);
				// Read data from Test.bmp.

				int i;
				byte [] bTmp = new byte[14];

				if ((i=r.Read(bTmp, 0, 14)) != 14)
				{
					MessageBox.Show("读取文件头错误");
					return;
				}

				bmpHeader bh = new bmpHeader(bTmp);

				bTmp = new byte[40];

				if ((i=r.Read(bTmp, 0, 40)) != 40)
				{
					MessageBox.Show("读取文件头错误");
					return;
				}
				bmpInfoHeader bih = new bmpInfoHeader(bTmp);

				//r.BaseStream.Length
				if (bih.BitCount == 24)
				{
					byte[] bEncode = Encoding.UTF8.GetBytes(CodeText.Text);
					if (((bh.FileSize - 54) / 4) < bEncode.Length)
					{	
						MessageBox.Show("要加密文件过长,请重新选择文件载体(bmp文件)!");
						r.Close();
						fsi.Close();
						return;
					}
					FileStream fso = new FileStream(FILE_NAME2, FileMode.Create, FileAccess.Write);
					BinaryWriter w = new BinaryWriter(fso);
					//bh.reserved = (uint)bEncode.Length;
					bih.BitCount = 32;
					bih.ColorsImportant = 32;
					w.Write(bh.ToArray());
					w.Write(bih.ToArray());
					bTmp = new byte[4];
					int nIndex = 0;
					
					while ((i = r.Read(bTmp, 0, 3))> 0)
					{
						//if ( i == 4 && bEncode.Length > nIndex )
						if ( i == 3)
							bTmp[3] = 0;// bEncode[nIndex];
						w.Write(bTmp);
						nIndex ++;
					}
					w.Close();
					fso.Close();
				}
				r.Close();
				fsi.Close();

				MessageBox.Show("扩展完成");
			}
			catch (Exception ep) 
			{
				// Let the user know what went wrong.
				logs("The file could not be read:");
				logs(ep.Message);
			}
		
		
		}

		private void DecodeBmp_Click(object sender, System.EventArgs e)
		{
			try 
			{
				string FILE_NAME2 = tbBmp.Text;

				if (!File.Exists(FILE_NAME2)) 
				{
					MessageBox.Show(String.Format("{0} file not exists!", FILE_NAME2));
					return;
				}

				FileStream fsi = new FileStream(FILE_NAME2, FileMode.Open, FileAccess.Read);
				BinaryReader r = new BinaryReader(fsi);
				// Read data from Test.bmp.

				int i;
				byte [] bTmp = new byte[14];

				if ((i=r.Read(bTmp, 0, 14)) != 14)
				{
					MessageBox.Show("读取文件头错误");
					r.Close();
					fsi.Close();
					return;
				}

				bmpHeader bh = new bmpHeader(bTmp);

				bTmp = new byte[40];

				if ((i=r.Read(bTmp, 0, 40)) != 40)
				{
					MessageBox.Show("读取文件头错误");
					r.Close();
					fsi.Close();
					return;
				}
				bmpInfoHeader bih = new bmpInfoHeader(bTmp);

				if (bh.reserved == 0 || bih.BitCount != 32)