/// <exception cref="Com.Khubla.Pdxreader.Api.PDXReaderException"/>
public static MBTableBlock GetMBTableBlock(MBTableBlock.RecordType recordType)
{
switch (recordType)
{
case MBTableBlock.RecordType.header:
{
return(new MBTableHeaderBlock());
}
case MBTableBlock.RecordType.single:
{
return(new MBSingleBlock());
}
case MBTableBlock.RecordType.suballocated:
{
return(new MBSuballocatedBlock());
}
case MBTableBlock.RecordType.free:
{
return(new MBFreeBlock());
}
default:
{
throw new PDXReaderException("Unknown record type '" + recordType + "'");
}
}
}
/// <summary>This method finds all the blocks with their types and offsets</summary>
/// <exception cref="Com.Khubla.Pdxreader.Api.PDXReaderException"/>
private void PreReadBlocks(File file)
{
try
{
/*
* set up streams
*/
BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream
(file));
LittleEndianDataInputStream littleEndianDataInputStream = new LittleEndianDataInputStream
(bufferedInputStream);
try
{
/*
* offset tracker
*/
int fileOffset = 0;
/*
* loop
*/
while (littleEndianDataInputStream.Available() > 1)
{
/*
* read type
*/
int type = littleEndianDataInputStream.ReadByte();
/*
* get an appropriate Block type
*/
MBTableBlock.RecordType recordType = MBTableBlock.GetRecordType(type);
/*
* ok?
*/
if (null != recordType)
{
MBTableBlock mbTableBlock = MBTableBlockFactory.GetMBTableBlock(recordType);
/*
* set the offset
*/
mbTableBlock.SetFileOffset(fileOffset);
/*
* pre-read
*/
int bytesPreRead = mbTableBlock.PreRead(littleEndianDataInputStream);
/*
* add to list
*/
blocks.Add(mbTableBlock);
/*
* skip forward to next one
*/
int bytesToSkip = mbTableBlock.GetSizeofBlock() - (1 + bytesPreRead);
long skipped = littleEndianDataInputStream.Skip(bytesToSkip);
if (0 != skipped)
{
/*
* update the offset
*/
fileOffset += mbTableBlock.GetSizeofBlock();
}
}
}
}
finally
{
littleEndianDataInputStream.Close();
bufferedInputStream.Close();
}
}
catch (Exception e)
{
throw new PDXReaderException("Exception in read", e);
}
}
public MBTableBlock(MBTableBlock.RecordType recordType)
{
// Size of block divided by 4k (1 because the header is 4k)
this.recordType = recordType;
}
