public static FileStream OpenLogFile(string filePath)
{
FileStream fileStream = null;
try
{
fileStream = CsvFieldCache.OpenFileAndSkipPreamble(filePath);
if (fileStream == null)
{
return(null);
}
string text;
return(CsvFieldCache.SeekToDataStartOffset(fileStream, out text));
}
catch (IOException ex)
{
ExTraceGlobals.CommonTracer.TraceError <string>(0L, "CsvFieldCache OpenLogFile failed with error {0}", ex.Message);
}
catch (UnauthorizedAccessException ex2)
{
ExTraceGlobals.CommonTracer.TraceError <string>(0L, "CsvFieldCache OpenLogFile failed with error {0}", ex2.Message);
}
if (fileStream != null)
{
fileStream.Close();
}
return(null);
}
private static FileStream SeekToDataStartOffset(FileStream file, out string version)
{
int num = -1;
version = string.Empty;
byte[] array = new byte[1024];
bool flag = true;
int num2;
int i;
for (;;)
{
num2 = file.Read(array, 0, array.Length);
if (num2 == 0)
{
break;
}
for (i = 0; i < num2; i++)
{
byte b = array[i];
if (flag)
{
if (b != 35)
{
goto Block_3;
}
if (i + "Version:".Length < num2)
{
string text = CsvFieldCache.DecodeString(array, i + 1, "Version:".Length);
if (text.Equals("Version:"))
{
num = i + "Version:".Length + 1;
}
}
flag = false;
}
else if (b == 10)
{
flag = true;
if (num != -1)
{
version = CsvFieldCache.DecodeString(array, num, i - num).Trim();
num = -1;
}
}
}
}
file.Close();
return(null);
Block_3:
file.Seek((long)(i - num2), SeekOrigin.Current);
return(file);
}
public bool Find(IComparable key, CsvFieldCache cursor)
{
ExTraceGlobals.CommonTracer.TraceDebug((long)this.GetHashCode(), "CsvClusteredIndex Find");
long position = cursor.Position;
long num = cursor.Length;
bool flag = false;
while (position <= num - (long)cursor.ReadSize)
{
long num2 = cursor.Seek((num - position) / 2L + position);
if (!cursor.MoveNext(false))
{
num = num2;
}
else
{
object obj = null;
while (obj == null && cursor.MoveNext(false))
{
if (cursor.FieldCount != cursor.SchemaFieldCount)
{
flag = true;
}
obj = cursor.GetField(this.idx);
}
if (obj == null)
{
num = num2;
}
else if (key.CompareTo(obj) > 0)
{
position = cursor.Position;
}
else
{
num = num2;
}
}
}
cursor.Seek(position);
bool flag2 = this.Scan(key, cursor);
return(flag || flag2);
}
private bool Scan(IComparable key, CsvFieldCache cursor)
{
ExTraceGlobals.CommonTracer.TraceDebug((long)this.GetHashCode(), "CsvClusteredIndex Scan");
bool result = false;
while (cursor.MoveNext(false))
{
if (cursor.FieldCount != cursor.SchemaFieldCount)
{
result = true;
}
object field = cursor.GetField(this.idx);
if (field != null && key.CompareTo(field) <= 0)
{
break;
}
}
return(result);
}
public ReadOnlyRow(CsvFieldCache cursor, long position)
{
this.cursor = cursor;
this.position = position;
}