public const int KMinimumSize = 16 + 4; // Enough to read UIDs + signature
#endregion
#region API
public static bool IsSymbianImageHeader(byte[] aHeader)
{
// We expect to see 16 bytes (3 x UID, 1 x UID checksum) and then
// the magic word EPOC
bool ret = false;
//
if (aHeader.Length >= KMinimumSize)
{
// We expect 16 bytes are the UID + checksum. Next should be the signature.
string sig = StringParsingUtils.BytesToString(aHeader, 16, 20);
ret = (sig == KExpectedSignature);
}
//
return(ret);
}
public SIHeaderROM(SIImage aImage, Stream aStream)
: base(aImage)
{
aStream.Seek(0, SeekOrigin.Begin);
//
iHeaderData = new byte[KMaximumRomHeaderSize];
int amountRead = aStream.Read(iHeaderData, 0, KMaximumRomHeaderSize);
//
string headerText = StringParsingUtils.BytesToString(iHeaderData, KEpocHeaderLength);
base.Trace("[SymbianImageHeaderROM] Ctor() - headerText: {0}, amountRead: {1}", headerText, amountRead);
//
if (IsEpocHeader(headerText) == false)
{
throw new NotSupportedException(string.Format("ROM Image header is unsupported: {0}", headerText));
}
//
ReadHeaderData(iHeaderData);
}
public static SIHeaderROF New(SIImage aImage, Stream aStream)
{
byte[] signature = new byte[4];
int readResult = aStream.Read(signature, 0, signature.Length);
if (readResult != 4)
{
throw new Exception("Unable to read ROF signature");
}
// Put us back where we were
aStream.Seek(-signature.Length, SeekOrigin.Current);
// Convert signature to string and compare against known types.
string headerText = StringParsingUtils.BytesToString(signature);
aImage.Trace("[SymbianImageHeaderROF] New() - headerText: {0}", headerText);
//
SIHeaderROF ret = null;
switch (headerText)
{
case "ROFX":
ret = new SIHeaderROFS(aImage, aStream);
break;
case "ROFS":
ret = new SIHeaderROFX(aImage, aStream);
break;
default:
throw new NotSupportedException("Unsupported ROF type");
}
//
return(ret);
}