/// <summary>
/// Method to validate the contents of dataBuffer
/// </summary>
/// <param name="dataBuffer">
/// The byte array to be validated.
/// </param>
/// <param name="objStructure">
/// The outparam represents the complete structure
/// of File stream.
/// </param>
/// <returns>
/// The return value indicates the status of the parser.
/// </returns>
public bool ValidateDataBuffer(byte[] dataBuffer,
out ReplicatedFileStructure objStructure)
{
ReplicatedFileStructure obj = new ReplicatedFileStructure();
index = 0;
#region BlockSignature
obj.signature.BlockSignature = objHelper.GetSubArray(dataBuffer, index, 8);
index += 8;
ASCIIEncoding encoding = new ASCIIEncoding();
string signature = encoding.GetString(obj.signature.BlockSignature);
//The string "FRSXXBLO" correspond to a standard signature
//representing the compressed format.
if (signature.ToUpper() != "FRSXXBLO")
{
isParserSuccessful = false;
objStructure = obj;
return(isParserSuccessful);
}
obj.signature.BlockCompressedSize = BitConverter.ToUInt32(dataBuffer, index);
index += 4;
obj.signature.BlockUncompressedSize = BitConverter.ToUInt32(dataBuffer, index);
index += 4;
#endregion
if (obj.signature.BlockUncompressedSize > maxUncompressedSize)
{
isParserSuccessful = false;
objStructure = obj;
return(isParserSuccessful);
}
//Invalid Data
if (obj.signature.BlockCompressedSize > obj.signature.BlockUncompressedSize)
{
isParserSuccessful = false;
objStructure = obj;
return(isParserSuccessful);
}
//The data is in Compressed Format
if (obj.signature.BlockCompressedSize < obj.signature.BlockUncompressedSize)
{
Decompressor.Decompressor objDecompressor = new Decompressor.Decompressor();
byte[] input = objHelper.GetSubArray(dataBuffer, 16, (int)obj.signature.BlockCompressedSize);
byte[] outputBuffer = new byte[obj.signature.BlockUncompressedSize];
objDecompressor.Decompress(input, obj.signature.BlockUncompressedSize, out outputBuffer);
isParserSuccessful = ReadData(outputBuffer, 0, ref obj);
}
//The data is in Uncompressed Format
if (obj.signature.BlockCompressedSize == obj.signature.BlockUncompressedSize)
{
isParserSuccessful = ReadData(dataBuffer, 16, ref obj);
}
objStructure = obj;
return(isParserSuccessful);
}
/// <summary>
/// Validates the data buffer.
/// </summary>
/// <param name="dataBuffer">
/// input data buffer to be validated.
/// </param>
/// <param name="index">
/// Index from where the data is to be read.
/// </param>
/// <param name="obj">
/// Returns Replicated File Structure
/// </param>
/// <returns></returns>
public bool ReadData(byte[] dataBuffer, int index, ref ReplicatedFileStructure obj)
{
obj.streamdata = new Dictionary <int, StreamData>();
StreamData objStreamData = new StreamData();
while (index < dataBuffer.Length)
{
//Reads the Stream Header
ReadStreamHeader(dataBuffer,
streamCount,
ref index,
ref objStreamData);
if (!isParserSuccessful)
{
return(isParserSuccessful);
}
switch (objStreamData.Header.streamType)
{
//Read Meata Data Stream
#region METADATA STREAM
case (uint)StreamType_Values.MS_TYPE_META_DATA:
int metaDataSize = (int)objStreamData.Header.blockSize;
byte[] metaData = new byte[metaDataSize];
metaData = objHelper.GetSubArray(dataBuffer, index, metaDataSize);
if (metaDataSize == 0x48)
{
ValidateMetaData(metaData, ref objStreamData);
obj.streamdata.Add(streamCount, objStreamData);
}
else
{
isParserSuccessful = false;
}
index += metaDataSize;
streamCount++;
break;
#endregion
//Read Compression Data Stream
#region COMPRESSION STREAM
case (uint)StreamType_Values.MS_TYPE_COMPRESSION_DATA:
int compressionDataSize = (int)objStreamData.Header.blockSize;
byte[] compressionData = new byte[compressionDataSize];
compressionData = objHelper.GetSubArray(dataBuffer, index, compressionDataSize);
if (compressionDataSize == 0x02)
{
ValidateCompressionData(compressionData, ref objStreamData);
obj.streamdata.Add(streamCount, objStreamData);
}
else
{
isParserSuccessful = false;
}
index += compressionDataSize;
streamCount++;
break;
#endregion
//Read Reparse Data Stream
#region REPARSE STREAM
case (uint)StreamType_Values.MS_TYPE_REPARSE_DATA:
int reparseDataSize = (int)objStreamData.Header.blockSize;
byte[] reparseData = new byte[reparseDataSize];
reparseData = objHelper.GetSubArray(dataBuffer, index, reparseDataSize);
ValidateReparseData(reparseData, ref objStreamData);
obj.streamdata.Add(streamCount, objStreamData);
index += reparseDataSize;
streamCount++;
break;
#endregion
//Read Flat Data Stream
#region FLAT STREAM
case (uint)StreamType_Values.MS_TYPE_FLAT_DATA:
//This is the last stream of the Marshalled Data Buffer
//Can contain multiple Backup Streams.
while (index < dataBuffer.Length)
{
UInt64 flatDataSize = BitConverter.ToUInt64(dataBuffer, index + 8);
UInt32 dwStreamNameSize = BitConverter.ToUInt32(dataBuffer, index + 16);
int totalSize = (int)(20 + flatDataSize + dwStreamNameSize);
byte[] flatData = new byte[totalSize];
flatData = objHelper.GetSubArray(dataBuffer,
index,
totalSize);
BKUPParser.BKUPParser objFlat = new BKUPParser.BKUPParser();
FlatDataStream flatStreamData = new FlatDataStream();
isParserSuccessful = objFlat.ValidateBKUPDataBuffer(flatData, out flatStreamData);
objStreamData.FlatData = flatStreamData;
obj.streamdata.Add(streamCount, objStreamData);
index += totalSize;
}
streamCount++;
break;
#endregion
//Read Security Data Stream
#region SECURITY STREAM
case (uint)StreamType_Values.MS_TYPE_SECURITY_DATA:
int securityDataSize = (int)objStreamData.Header.blockSize;
byte[] securityData = new byte[securityDataSize];
securityData = objHelper.GetSubArray(dataBuffer, index, securityDataSize);
ValidateSecurityData(securityData, ref objStreamData);
obj.streamdata.Add(streamCount, objStreamData);
index += securityDataSize;
streamCount++;
break;
#endregion
default:
isParserSuccessful = false;
return(isParserSuccessful);
}
}
return(isParserSuccessful);
}
