/// <summary>
/// Creates a new EWFInfo helper class from filePath.
/// </summary>
/// <param name="filePath">The path of the EWF file.</param>
public EWFInfo(string filePath)
{
FilePath = filePath;
using (FileStream fs = File.OpenRead(filePath))
{
fs.Seek(0, SeekOrigin.Begin);
byte[] buff = new byte[13];
fs.Read(buff, 0, 13);
EWFHeader ewfHeader = new EWFHeader(buff);
while (fs.Position < fs.Length)
{
buff = new byte[76];
fs.Read(buff, 0, 76);
SectionDescriptor sd = new SectionDescriptor(buff, fs.Position - 76);
switch (sd.SectionType)
{
case SECTION_TYPE.header:
case SECTION_TYPE.header2:
// Save the header
buff = new byte[sd.NextSectionOffset - fs.Position];
fs.Read(buff, 0, sd.NextSectionOffset - (int)fs.Position);
HeaderSection = new Section.Header2(buff);
break;
case SECTION_TYPE.volume:
case SECTION_TYPE.disk:
case SECTION_TYPE.data:
// Save the volume
buff = new byte[sd.NextSectionOffset - fs.Position];
fs.Read(buff, 0, sd.NextSectionOffset - (int)fs.Position);
VolumeSection = new Section.Volume(buff);
break;
case SECTION_TYPE.next:
case SECTION_TYPE.done:
fs.Seek(76, SeekOrigin.Current);
break;
default:
fs.Seek(sd.NextSectionOffset - (int)fs.Position, SeekOrigin.Current);
break;
}
if (HeaderSection != null && VolumeSection != null)
{
break;
}
}
}
if (HeaderSection == null || VolumeSection == null)
{
throw new Exception("file missing header or volume section");
}
}
/// <summary>
/// Creates a new EWFInfo helper class from filePath.
/// </summary>
/// <param name="filePath">The path of the EWF file.</param>
public EWFInfo(string filePath)
{
FilePath = filePath;
using (FileStream fs = File.OpenRead(filePath))
{
fs.Seek(0, SeekOrigin.Begin);
byte[] buff = new byte[13];
fs.Read(buff, 0, 13);
EWFHeader ewfHeader = new EWFHeader(buff);
while (fs.Position < fs.Length)
{
buff = new byte[76];
fs.Read(buff, 0, 76);
SectionDescriptor sd = new SectionDescriptor(buff, fs.Position - 76);
switch (sd.SectionType)
{
case SECTION_TYPE.header:
case SECTION_TYPE.header2:
// Save the header
buff = new byte[sd.NextSectionOffset - fs.Position];
fs.Read(buff, 0, sd.NextSectionOffset - (int)fs.Position);
HeaderSection = new Section.Header2(buff);
break;
case SECTION_TYPE.volume:
case SECTION_TYPE.disk:
case SECTION_TYPE.data:
// Save the volume
buff = new byte[sd.NextSectionOffset - fs.Position];
fs.Read(buff, 0, sd.NextSectionOffset - (int)fs.Position);
VolumeSection = new Section.Volume(buff);
break;
case SECTION_TYPE.next:
case SECTION_TYPE.done:
fs.Seek(76, SeekOrigin.Current);
break;
default:
fs.Seek(sd.NextSectionOffset - (int)fs.Position, SeekOrigin.Current);
break;
}
if (HeaderSection != null && VolumeSection != null)
break;
}
}
if (HeaderSection == null || VolumeSection == null)
throw new Exception("file missing header or volume section");
}
private void ResolveFileChain()
{
int i = 0;
bool gotDone = false;
do
{
using (FileStream fs = File.OpenRead(Files[i]))
{
try
{
byte[] buff = new byte[13];
fs.Read(buff, 0, 13);
EWFHeader header = new EWFHeader(buff);
if (header.SegmentNumber != i + 1)
{
throw new ArgumentException(string.Format("invalid segment order: got {0}, should be {1}", header.SegmentNumber, i + 1));
}
buff = new byte[76];
fs.Seek(-76, SeekOrigin.End);
fs.Read(buff, 0, 76);
SectionDescriptor secDescriptor = new SectionDescriptor(buff, fs.Length - 76);
if (secDescriptor.SectionType == SECTION_TYPE.next)
{
Files.Add(Utils.CalcNextFilename(Files[i]));
i++;
}
else if (secDescriptor.SectionType == SECTION_TYPE.done)
{
gotDone = true;
}
else
{
throw new Exception(string.Format("unexpected final section: {0}", secDescriptor.SectionType));
}
}
catch (Exception ex)
{
throw new Exception(string.Format("error whilst processing {0}", Files[i]), ex);
}
}
} while (!gotDone);
}
