/// <summary>Create a list that contains the origin of all bytes in the result file</summary>
/// <param name="dataPacket">the data packet that makes up the result file</param>
/// <param name="forensicLogType">the type of data being logged</param>
internal void WriteDetailInformation(IDataPacket dataPacket, ForensicLogType forensicLogType)
{
_textWriter.WriteLine();
string sourceHeaderText;
if (forensicLogType == ForensicLogType.CopiedData)
{
sourceHeaderText = "Build-up of resulting file:";
}
else if (forensicLogType == ForensicLogType.ConvertedData)
{
sourceHeaderText = "Build-up of source data (before being converted by FFmpeg):";
}
else
{
sourceHeaderText = string.Empty;
}
_textWriter.WriteLine(sourceHeaderText);
_textWriter.WriteLine("From byte location:{0}To byte location:{1}Length:{2}Maps to source file(s):{3}From byte location:{4}To byte location:", SeparatorChar, SeparatorChar, SeparatorChar, SeparatorChar, SeparatorChar);
for (long offset = 0L; offset < dataPacket.Length;)
{
IDataPacket subpacket = dataPacket.GetFragment(offset);
_textWriter.WriteLine("{0}{1}{2}{3}{4}{5}{6}{7}{8}{9}{10}",
offset, SeparatorChar, offset + subpacket.Length, SeparatorChar, subpacket.Length,
SeparatorChar, subpacket.InputFile.Name, SeparatorChar, subpacket.StartOffset,
SeparatorChar, subpacket.EndOffset);
offset += subpacket.Length;
}
}
/// <summary>Create a forensic integrity log.</summary>
/// <remarks>
/// The log contains:
/// <list type="bullet">
/// <item>MD5 hashes of the all input files used.</item>
/// <item>MD5 hash of result file.</item>
/// <item>Detailed information about the source of each byte in the result file.</item>
/// </list>
/// </remarks>
/// <param name="dataPacket">The data packet used to create the result file.</param>
/// <param name="detectors">The metadata for the data packets</param>
/// <param name="resultFile">The created result file.</param>
/// <param name="stream">The stream to write the forensic integrity log information to.</param>
public void Log(IDataPacket dataPacket, IEnumerable <IDetector> detectors, string resultFile, Stream stream, ForensicLogType forensicLogType)
{
PreConditions.Argument("dataPacket").Value(dataPacket).IsNotNull();
PreConditions.Argument("detectors").Value(detectors).IsNotNull().And.DoesNotContainNull();
PreConditions.Argument("resultFile").Value(resultFile).IsNotNull().And.IsNotEmpty();
PreConditions.Argument("stream").Value(stream).IsNotNull();
using (LogWriter logWriter = new LogWriter(stream, _projectManager.Project, _detectorFormatter))
{
logWriter.WriteHeader();
logWriter.WriteUsedDetectors(detectors);
logWriter.WriteSourceFileChecksum(dataPacket);
logWriter.WriteResultFileChecksum(resultFile);
logWriter.WriteDetailInformation(dataPacket, forensicLogType);
}
}
