/// <summary>
/// 校验MD5
/// </summary>
private void validateMD5()
{
string origin = Header.MD5;
StringBuilder hash = new StringBuilder();
Header.MD5 = Writer.SECRET_KEY;
hash.Append(MD5Helper.ComputeHash(BinaryHelper.Serialize(Header)));
for (int i = 0; i < Header.Count; i++)
{
using (FileStream fs = new FileStream(Path.Combine(WorkDirectory, Header[i].FileName), FileMode.Open))
{
hash.Append(MD5Helper.ComputeHash(fs));
}
}
string current = MD5Helper.ComputeHash(hash.ToString());
if (origin != current)
{
//throw new Exception("MD5校验值不一致，文件已被修改");
}
Header.MD5 = origin;
}
public void Append(string name, object content)
{
if (name == "header")
{
throw new Exception($"header为保留关键字，不允许使用。");
}
if (Header.Where(item => item.Name == name).Count() > 0)
{
throw new Exception($"已存在同名的数据项{name}");
}
byte[] data = BinaryHelper.Serialize(content);
if (Header.EnablePage)
{
if (currentPos + data.Length > Header.MaxSize * 1024 * 1024)
{
fs.Close();
currentPage++;
fs = new FileStream(Path.Combine(WorkDirectory, $"{Header.FileName}._{currentPage}"), FileMode.CreateNew);
fileList.Add(fs.Name);
currentPos = fs.Position;
}
}
Header.Add(new DataEntry
{
Name = name,
PageNum = currentPage,
Offset = currentPos,
Length = data.Length
});
fs.Write(data, 0, data.Length);
currentPos = fs.Position;
}
private void writeHeader()
{
fs = new FileStream(Path.Combine(WorkDirectory, $"{Header.FileName}.header"), FileMode.CreateNew);
fileList.Add(fs.Name);
byte[] data = BinaryHelper.Serialize(Header);
fs.Write(data, 0, data.Length);
fs.Close();
}
/// <summary>
/// 将头部信息写入文件
/// </summary>
private void writeHeader()
{
string partialName = $"{Header.FileName}.header";
addPartialFile(partialName);
FileStream fs = new FileStream(Path.Combine(WorkDirectory, partialName), FileMode.CreateNew);
byte[] data = BinaryHelper.Serialize(Header);
fs.Write(data, 0, data.Length);
fs.Close();
}
/// <summary>
///
/// </summary>
private void computeMD5()
{
StringBuilder hash = new StringBuilder();
Header.MD5 = SECRET_KEY;
hash.Append(MD5Helper.ComputeHash(BinaryHelper.Serialize(Header)));
for (int i = 0; i < Header.Count; i++)
{
using (FileStream fs = new FileStream(Path.Combine(WorkDirectory, Header[i].FileName), FileMode.Open))
{
hash.Append(MD5Helper.ComputeHash(fs));
}
}
Header.MD5 = MD5Helper.ComputeHash(hash.ToString());
}