public static void InsertFile(IndexNode node, EntryInfo enInfo, Stream stream, Engine engine)
{
var buffer = new byte[DataPage.DATA_PER_PAGE];
int dataFreeInPage = DataPage.DATA_PER_PAGE;
int writePos = 0;
int read = 0;
DataPage dataPage = engine.GetDataPage(node.DataPageID);
if (!dataPage.IsEmpty) // This is never to happend!!
{
throw new FileDBException("Page {0} is not empty", dataPage.PageID);
}
//-----------------------
//write metadata
//1. datetime of file
DateTime filedtm = enInfo.FileDateTime;
//--------------------------
writePos = WriteByte(dataPage.DataBlock, 0, 1); //marker - 1
writePos = WriteInt64(dataPage.DataBlock, writePos, filedtm.ToBinary()); //data part
//--------------------------
//2. long filename (if has long filename)
//-----------------------
if (enInfo.HasLongFileName)
{
//write full filename here
byte[] longFileNameBuff = System.Text.Encoding.UTF8.GetBytes(enInfo.FileUrl);
int buffLen = longFileNameBuff.Length;
if (buffLen > 512)
{
//for this version ***
throw new Exception("file name must not longer than 512 bytes");
}
writePos = WriteByte(dataPage.DataBlock, writePos, 2); //marker 2 long filename
//--------
writePos = WriteUInt16(dataPage.DataBlock, writePos, (ushort)buffLen); //2 bytes length of buffer
writePos = WriteBuffer(dataPage.DataBlock, writePos, longFileNameBuff); //buffer
//--------
}
dataPage.IsEmpty = false;
dataPage.DataBlockLength = (short)writePos;
dataFreeInPage -= writePos;
node.FileMetaDataLength = (ushort)writePos;
//-----------------------
bool isFirstRound = true;
uint fileLength = 0;
while ((read = stream.Read(buffer, 0, dataFreeInPage)) > 0)
{
//if we have some data to write
fileLength += (uint)read;
if (!isFirstRound)
{
dataPage = GetNewDataPage(dataPage, engine);
if (!dataPage.IsEmpty) // This is never to happend!!
{
throw new FileDBException("Page {0} is not empty", dataPage.PageID);
}
}
writePos = WriteBuffer(dataPage.DataBlock, writePos, buffer, read);
dataPage.IsEmpty = false;
dataPage.DataBlockLength = (short)writePos;
//----------------------------------------------
//reset for next
dataFreeInPage = DataPage.DATA_PER_PAGE;
writePos = 0;
isFirstRound = false;
//----------------------------------------------
}
// If the last page point to another one, i need to fix that
if (dataPage.NextPageID != uint.MaxValue)
{
engine.Header.FreeDataPageID = dataPage.NextPageID;
dataPage.NextPageID = uint.MaxValue;
}
// Save the last page on disk
PageFactory.WriteToFile(dataPage, engine.Writer);
// Save on node index that file length
node.FileLength = fileLength;
}
