/// <summary>
/// 写文件块
/// </summary>
/// <param name="savePath"></param>
/// <param name="section"></param>
private void WriteSection(string savePath, SectionData section)
{
long startPosition = section.CurrentPageIndex * section.SectionSize;
byte[] data = section.Data;
byte value = 1;
// 检测该块是否已经被写入 避免重复写
using (FileStream fileWrite = new FileStream(savePath, FileMode.Open, FileAccess.Write))
{
fileWrite.Seek(startPosition, SeekOrigin.Begin);
fileWrite.Write(data, 0, data.Length);
long updatePosition = section.FileSize + section.CurrentPageIndex;
fileWrite.Seek(updatePosition, SeekOrigin.Begin);
fileWrite.WriteByte(value);
fileWrite.Close();
fileWrite.Dispose();
}
}
/// <summary>
/// 获取分块数据
/// </summary>
/// <param name="sectionIndex"></param>
/// <returns></returns>
public SectionData GetFileData(int sectionIndex)
{
if (sectionIndex < 0 || sectionIndex >= this.TotalSectionCount)
{
return(null);
}
SectionData section = new SectionData();
section.FileName = this.FileName;
section.FileSize = this.FileSize;
section.SectionSize = this.SectionSize;
section.Pages = this.TotalSectionCount;
section.CurrentPageIndex = sectionIndex;
section.Data = this.GetSection(sectionIndex);
section.MD5 = FileSectionUtils.GetMD5Hash(section.Data);
if (this.Setting.DataType == SectionDataType.Base64)
{
section.Base64String = Convert.ToBase64String(section.Data);
section.Data = null;
}
return(section);
}
/// <summary>
/// 保存数据
/// </summary>
/// <param name="section"></param>
/// <returns></returns>
public SaveResult SaveSection(SectionData section)
{
SaveResult result = new SaveResult();
if (section == null || (section.Data == null && string.IsNullOrEmpty(section.Base64String)))
{
result.Message = "没有数据!";
return(result);
}
if (string.IsNullOrEmpty(this.FileName))
{
this.FileName = section.FileName;
}
string savePath = this.Dir + System.IO.Path.DirectorySeparatorChar + this.FileName;
//已经存在
if (System.IO.File.Exists(savePath))
{
if (section.CurrentPageIndex == 0)
{
System.IO.File.Delete(savePath);
}
else
{
result.Success = true;
result.Message = "文件已存在!";
return(result);
}
}
//查找特殊后缀名
savePath += ".fstp";
if (!System.IO.File.Exists(savePath))
{
//不存在则说明是首次请求进行创建， 创建不一定是 CurrentPageIndex==0 的请求
this.CreateSaveFile(savePath, section.FileSize, section.Pages);
}
if (string.IsNullOrEmpty(section.MD5))
{
result.Success = true;
result.Message = "MD5缺失!";
return(result);
}
//验证MD5
if (section.Data != null && section.Data.Length > 0)
{
string MD5 = FileSectionUtils.GetMD5Hash(section.Data);
if (!MD5.Equals(section.MD5))
{
result.Success = false;
result.Message = "MD5错误!";
return(result);
}
else
{
this.WriteSection(savePath, section);
}
}
else if (!string.IsNullOrEmpty(section.Base64String))
{
byte[] buffer = Convert.FromBase64String(section.Base64String);
section.Data = buffer;
string MD5 = FileSectionUtils.GetMD5Hash(buffer);
if (!MD5.Equals(section.MD5))
{
result.Success = false;
result.Message = "MD5错误!";
return(result);
}
else
{
this.WriteSection(savePath, section);
}
}
result.Success = true;
//检查是否全部写完
result.FileFinished = CheckSaveOver(savePath, section);
return(result);
}