private void VersionCheckAndUpgrade()
{
string line = fileReader.ReadLine();
if (line == null)
{
// fresh file
WriteHeader();
return;
}
int fileVersion = -1;
if (!line.StartsWith(VersionHeader) ||
!int.TryParse(line.Substring(VersionHeader.Length), out fileVersion))
{
throw new FormatException("The history file has an invalid header.");
}
if (fileVersion < HistoryManagerVersion)
{
BackupFile();
}
switch (fileVersion)
{
case 0: /*do upgrade stuff*/ goto case 1;
case 1: break; // lastest version
default:
throw new FormatException("Not recognized header version");
}
}
public void PositionedStreamReaderBufferSize()
{
using (var memStream = new MemoryStream())
{
// Setting streams up
var writer = new StreamWriter(memStream);
string[] values = new[] {
new string('1', 1024) + '\n', // 1025: 1 over buffer size
new string('1', 1023) + '\n', // 1024: exactly the buffer size, but 1 over the 1024 line block due to the previous
new string('1', 1022) + '\n', // 1023: 1 less then the buffer size, should now match the line block again
new string('1', 1024)
};
foreach (var val in values)
{
writer.Write(val);
}
writer.Flush();
memStream.Seek(0, SeekOrigin.Begin);
var reader = new PositionedStreamReader(memStream);
int pos = 0;
foreach (var val in values)
{
var line = reader.ReadLine();
pos += val.Length;
Assert.AreEqual(val.TrimEnd(new[] { '\r', '\n' }), line);
Assert.AreEqual(pos, reader.ReadPosition);
}
}
}
public void PositionedStreamReaderLineEndings()
{
using (var memStream = new MemoryStream())
{
// Setting streams up
var writer = new StreamWriter(memStream);
string[] values =
{
"11\n",
"22\n",
"33\n",
"44\r",
"55\r",
"66\r",
"77\r\n",
"88\r\n",
"99\r\n",
"xx\n", "\r",
"yy\n", "\r",
"zz\n", "\r",
"a\r",
"b\n",
"c\r\n",
"d\n", "\r",
"e"
};
foreach (var val in values)
{
writer.Write(val);
}
writer.Flush();
memStream.Seek(0, SeekOrigin.Begin);
var reader = new PositionedStreamReader(memStream);
int pos = 0;
foreach (var val in values)
{
var line = reader.ReadLine();
pos += val.Length;
Assert.AreEqual(val.TrimEnd(new[] { '\r', '\n' }), line);
Assert.AreEqual(pos, reader.ReadPosition);
}
}
}