/// <summary>
/// Does period handling.
/// </summary>
/// <param name="strm">Input stream.</param>
/// <param name="add_Remove">If true add periods, else removes periods.</param>
/// <param name="setStrmPosTo0">If true sets stream position to 0.</param>
/// <returns></returns>
public static MemoryStream DoPeriodHandling(Stream strm, bool add_Remove, bool setStrmPosTo0)
{
MemoryStream replyData = new MemoryStream();
byte[] crlf = new byte[] { (byte)'\r', (byte)'\n' };
if (setStrmPosTo0)
{
strm.Position = 0;
}
StreamLineReader r = new StreamLineReader(strm);
byte[] line = r.ReadLine();
// Loop through all lines
while (line != null)
{
if (line.Length > 0)
{
if (line[0] == (byte)'.')
{
/* Add period Rfc 2821 4.5.2
* - Before sending a line of mail text, the SMTP client checks the
* first character of the line. If it is a period, one additional
* period is inserted at the beginning of the line.
*/
if (add_Remove)
{
replyData.WriteByte((byte)'.');
replyData.Write(line, 0, line.Length);
}
/* Remove period Rfc 2821 4.5.2
* If the first character is a period , the first characteris deleted.
*/
else
{
replyData.Write(line, 1, line.Length - 1);
}
}
else
{
replyData.Write(line, 0, line.Length);
}
}
replyData.Write(crlf, 0, crlf.Length);
// Read next line
line = r.ReadLine();
}
replyData.Position = 0;
return(replyData);
}
/// <summary>
/// Parses relay info from stream.
/// </summary>
/// <param name="relayMsgStrm"></param>
private void ReadRelayInfo(Stream relayMsgStrm)
{
StreamLineReader reader = new StreamLineReader(relayMsgStrm);
string relayHead = System.Text.Encoding.ASCII.GetString(reader.ReadLine());
if(relayHead != null && relayHead.StartsWith("RelayInfo:")){
relayHead = relayHead.Replace("RelayInfo:","");
relayHead = relayHead.Trim();
string[] param = relayHead.Split(new char[]{'\t'});
if(param.Length == 4){
m_IsWSent = Convert.ToBoolean(Convert.ToInt32(param[0]));
m_To = param[1];
m_From = param[2];
m_MsgDate = DateTime.ParseExact(param[3],"r",System.Globalization.DateTimeFormatInfo.InvariantInfo);
}
m_MsgStartPos = (int)relayMsgStrm.Position;
}
}
/// <summary>
/// Does period handling.
/// </summary>
/// <param name="strm">Input stream.</param>
/// <param name="add_Remove">If true add periods, else removes periods.</param>
/// <param name="setStrmPosTo0">If true sets stream position to 0.</param>
/// <returns></returns>
public static MemoryStream DoPeriodHandling(Stream strm,bool add_Remove,bool setStrmPosTo0)
{
MemoryStream replyData = new MemoryStream();
byte[] crlf = new byte[]{(byte)'\r',(byte)'\n'};
if(setStrmPosTo0){
strm.Position = 0;
}
StreamLineReader r = new StreamLineReader(strm);
byte[] line = r.ReadLine();
// Loop through all lines
while(line != null){
if(line.Length > 0){
if(line[0] == (byte)'.'){
/* Add period Rfc 281 4.5.2
- Before sending a line of mail text, the SMTP client checks the
first character of the line. If it is a period, one additional
period is inserted at the beginning of the line.
*/
if(add_Remove){
replyData.WriteByte((byte)'.');
replyData.Write(line,0,line.Length);
}
/* Remove period Rfc 281 4.5.2
If the first character is a period , the first characteris deleted.
*/
else{
replyData.Write(line,1,line.Length-1);
}
}
else{
replyData.Write(line,0,line.Length);
}
}
// write enc stuff here miceli
replyData.Write(crlf,0,crlf.Length);
// Read next line
line = r.ReadLine();
}
replyData.Position = 0;
return replyData;
}
/// <summary>
/// Scans invalid CR or LF combination in stream. Returns true if contains invalid CR or LF combination.
/// </summary>
/// <param name="strm">Stream which to check.</param>
/// <returns>Returns true if contains invalid CR or LF combination.</returns>
public static bool ScanInvalid_CR_or_LF(Stream strm)
{
StreamLineReader lineReader = new StreamLineReader(strm);
byte[] line = lineReader.ReadLine();
while(line != null){
foreach(byte b in line){
// Contains CR or LF. It cannot conatian such sumbols, because CR must be paired with LF
// and we currently reading lines with CRLF combination.
if(b == 10 || b == 13){
return true;
}
}
line = lineReader.ReadLine();
}
return false;
}
/// <summary>
/// Adds column to db file.
/// </summary>
/// <param name="column"></param>
internal void AddColumn(LDB_DataColumn column)
{
// Find free column data area
// Set position over version, free data pages count and data page data area size
m_pDbFile.Position = 68;
long freeColumnPosition = -1;
StreamLineReader r = new StreamLineReader(m_pDbFile);
// Loop all columns data areas, see it there any free left
for(int i=0;i<100;i++){
byte[] columnInfo = r.ReadLine();
if(columnInfo == null){
throw new Exception("Invalid columns data area length !");
}
// We found unused column data area
if(columnInfo[0] == '\0'){
freeColumnPosition = m_pDbFile.Position;
break;
}
}
m_FilePosition = m_pDbFile.Position;
if(freeColumnPosition != -1){
// TODO: If there is data ???
// Move to row start
SetFilePosition(GetFilePosition() - 102);
// Store column
byte[] columnData = column.ToColumnInfo();
WriteToFile(columnData,0,columnData.Length);
}
else{
throw new Exception("Couldn't find free column space ! ");
}
}
/// <summary>
/// Opens specified data file.
/// </summary>
/// <param name="fileName">File name.</param>
/// <param name="waitTime">If data base file is exclusively locked, then how many seconds to wait file to unlock before raising a error.</param>
public void Open(string fileName,int waitTime)
{
DateTime lockExpireTime = DateTime.Now.AddSeconds(waitTime);
while(true){
try{
m_pDbFile = File.Open(fileName,FileMode.Open,FileAccess.ReadWrite,FileShare.ReadWrite);
break;
}
catch(IOException x){
// Make this because to get rid of "The variable 'x' is declared but never used"
string dummy = x.Message;
System.Threading.Thread.Sleep(15);
// Lock wait time timed out
if(DateTime.Now > lockExpireTime){
throw new Exception("Database file is locked and lock wait time expired !");
}
}
}
/* Table structure:
50 bytes - version
2 bytes - CRLF
8 bytes - free datapages count
2 bytes - CRLF
4 bytes - datapage data area size
2 bytes - CRLF
100 x 500 bytes - 100 columns info store
2 bytes - CRLF
... data pages
*/
m_DbFileName = fileName;
StreamLineReader r = new StreamLineReader(m_pDbFile);
// TODO: check if LDB file
// Read version line (50 bytes + CRLF)
byte[] version = r.ReadLine();
// Skip free data pages count
byte[] freeDataPagesCount = new byte[10];
m_pDbFile.Read(freeDataPagesCount,0,freeDataPagesCount.Length);
// 4 bytes datapage data area size + CRLF
byte[] dataPageDataAreaSize = new byte[6];
m_pDbFile.Read(dataPageDataAreaSize,0,dataPageDataAreaSize.Length);
m_DataPageDataAreaSize = ldb_Utils.ByteToInt(dataPageDataAreaSize,0);
// Read 100 column lines (500 + CRLF bytes each)
for(int i=0;i<100;i++){
byte[] columnInfo = r.ReadLine();
if(columnInfo == null){
throw new Exception("Invalid columns data area length !");
}
if(columnInfo[0] != '\0'){
m_pColumns.Parse(columnInfo);
}
}
// Header terminator \0
m_pDbFile.Position++;
// No we have rows start offset
m_DatapagesStartOffset = m_pDbFile.Position;
// Store file length and position
m_FileLength = m_pDbFile.Length;
m_FilePosition = m_pDbFile.Position;
}
