public static IEnumerable <string> ShardingFileParts
(
string originalFile
, int singlePartSize = 1024 * 1024
, string fileExtensionNameSuffix = "x"
)
{
var directory = Path.GetDirectoryName(originalFile);
var fileName = Path.GetFileNameWithoutExtension(originalFile);
var fileExtensionName = Path.GetExtension(originalFile);
fileName = Path.Combine
(
directory
, fileName
);
var destFileNamePattern = fileName + ".{0}.{1}" + fileExtensionName + fileExtensionNameSuffix;
var fileInfo = new FileInfo(originalFile);
//var list = new List<string>();
var length = fileInfo.Length;
if
(
length
>
singlePartSize
)
{
using
(
var sourceStream = File.OpenRead(originalFile)
)
{
var parts = Math.Ceiling((1.0d * length) / singlePartSize);
var part = 0;
var buffers = StreamDataHelper
.ReadDataToBuffers
(
sourceStream
, singlePartSize
);
foreach (var buffer in buffers)
{
part++;
var destPartFileName = string
.Format
(
destFileNamePattern
, parts
, part
);
//zippedPartFileName += "x";
using
(
var fileStream = new FileStream
(
destPartFileName
, FileMode.Create
, FileAccess.Write
, FileShare.None
)
)
{
fileStream.Write(buffer, 0, buffer.Length);
fileStream.Close();
//list.Add(zippedPartFileName);
yield
return
(destPartFileName);
}
}
}
File.Delete(originalFile);
//File.Delete(fileName);
}
else
{
//list.Add(zippedFileName);
var destPartFileName
= string.Format
(
destFileNamePattern
, 1
, 1
);
File.Move
(
originalFile
, destPartFileName
);
yield
return
(destPartFileName);
}
}
private static IEnumerable <string> MergePartialFilesGroupProcess
(
string mergedFileName
, IOrderedEnumerable <string>
orderedPartialFilesGroup
, int parts
)
{
var list = new List <string>();
int i = 0;
foreach (var file in orderedPartialFilesGroup)
{
i++;
var fileName = Path.GetFileName(file);
var fileNameSegments = fileName.Split('.');
var ii = fileNameSegments.Length - 2;
int part = int.Parse(fileNameSegments[ii]);
if (part == i)
{
using
(
var sourceStream = File.OpenRead(file)
)
{
using
(
var fileStream
=
(
parts > 1
?
new FileStream
(
mergedFileName
, FileMode.OpenOrCreate
, FileAccess.Write
, FileShare.None
)
:
new FileStream
(
mergedFileName
, FileMode.Create
, FileAccess.Write
, FileShare.None
)
)
)
{
if (parts > 1 && i > 1)
{
fileStream.Seek(0, SeekOrigin.End);
}
var buffers = StreamDataHelper
.ReadDataToBuffers
(
sourceStream
, 64 * 1024 //* 1024
);
foreach (var buffer in buffers)
{
fileStream.Write(buffer, 0, buffer.Length);
}
fileStream.Close();
}
sourceStream.Close();
list.Add(file);
}
if (i == parts)
{
//ExtractFileProcess(zippedFileName);
yield
return
(mergedFileName);
foreach (var x in list)
{
File.Delete(x);
}
}
}
else
{
if (File.Exists(mergedFileName))
{
File.Delete(mergedFileName);
}
break;
}
}
list.Clear();
}