public static HttpRequestRange New(HttpRequest request)
{
var rangeStr = request.Headers["Range"];
if (string.IsNullOrEmpty(rangeStr))
{
return(HttpRequestRange.Empty);
}
rangeStr = rangeStr.Replace("bytes=", string.Empty);
if (string.IsNullOrEmpty(rangeStr))
{
return(HttpRequestRange.Empty);
}
HttpRequestRange range = new HttpRequestRange();
if (rangeStr.IndexOf('-') == -1)
{
//Range bytes=1000 传输最后1000个字节。
range.LastBytes = int.Parse(rangeStr);
}
else
{
//bytes=0- 或者 bytes=1000-2000
var temp = rangeStr.Split('-');
range.StartIndex = long.Parse(temp[0]);
range.EndIndex = (temp.Length > 1 && !string.IsNullOrEmpty(temp[1])) ? long.Parse(temp[1]) : -1;
}
return(range);
}
protected override void ProcessGET()
{
var range = HttpRequestRange.New(this.Request);
if (!range.IsEmpty())
{
var size = GetFileSize();
long offset = 0;
long count = 0;
//分段读取
range.Process(this.Response, size, out offset, out count);
byte[] buffer = ReadFileBuffer(offset, (int)count);
this.Response.BinaryWrite(buffer);
this.Response.Flush();
}
else
{
//普通文件
var size = GetFileSize();
int bufferSize = GetBufferSize(size);
long offset = 0;
while (offset < size)
{
byte[] buffer = ReadFileBuffer(offset, bufferSize);
this.Response.BinaryWrite(buffer);
this.Response.Flush();
offset += buffer.Length;
}
}
}
