public void processBook(List <byte[]> pidList)
{
int firstOffset = (int)mSections.ElementAt(0).offset;
int cryptoType = mEncMobiBook.getShort(firstOffset + 0xC);
if (cryptoType == 0)
{
Debug.WriteLine("This Book is not encrypted");
}
else if (cryptoType != 1 && cryptoType != 2)
{
throw new Exception("Unknown Mobipocket CryptoType: " + cryptoType);
}
if (mMetaMap.ContainsKey(406))
{
byte[] data406 = mMetaMap[406];
if ((new ArraySlice(data406)).getLongLong() != 0)
{
throw new Exception("Cannot Decode library or rented eBooks");
}
}
List <byte[]> goodPids = validatePins(pidList);
byte[] pid = { 0, 0, 0, 0, 0, 0, 0, 0 };
byte[] foundKey;
if (cryptoType == 1)
{
byte[] t1KeyVec = Encoding.Default.GetBytes("QDCVEPMU675RUBSZ");
byte [] bookKeyData;
if (mHeader.getMagicString().Equals(MobiHeader.TEXT_READ))
{
bookKeyData = mEncMobiBook.byteSlice(0x0E + firstOffset, 16);
}
else if (mMobiVersion < 0)
{
bookKeyData = mEncMobiBook.byteSlice(0x90 + firstOffset, 16);
}
else
{
bookKeyData = mEncMobiBook.byteSlice(mMobiLength + firstOffset + 16, 16);
}
foundKey = PK1Dec(bookKeyData, t1KeyVec, false);
}
else
{
int drmPointer = (int)mEncMobiBook.getLong(firstOffset + 0xA8);
int drmCount = (int)mEncMobiBook.getLong();
int drmSize = (int)mEncMobiBook.getLong();
int drmFlags = (int)mEncMobiBook.getLong();
parseDRM(mEncMobiBook.byteSlice(drmPointer + firstOffset, drmSize), drmCount, goodPids);
}
}
public MobiHeader(ArraySlice headerSlice)
{
mMagic = System.Text.Encoding.Default.GetString(headerSlice.byteSlice(0x3C, 8));
if (!mMagic.Equals(BOOK_MOBI) && !mMagic.Equals(TEXT_READ))
{
throw new Exception("Invalid File Format");
}
mNumSections = headerSlice.getShort(76);
}
public MobiBook(String filename)
{
mEncMobiBook = getBookSlice(filename);
mHeader = new MobiHeader(mEncMobiBook);
mEncMobiBook.seek(MobiHeader.HEADER_SIZE);
for (int i = 0; i < mHeader.getNumberSections(); i++)
{
mSections.Add(new Section(mEncMobiBook));
}
int offset = (int)mSections[0].offset;
mCompression = mEncMobiBook.getShort(offset);
mRecords = mEncMobiBook.getShort(offset + 0x8);
if (mHeader.getMagicString().Equals(MobiHeader.TEXT_READ))
{
mExtraDataFlags = 0;
mMobiLength = 0;
mMobiCodepage = 0;
mMobiVersion = -1;
return;
}
mMobiLength = (int)mEncMobiBook.getLong(offset + 0x14);
mMobiCodepage = (int)mEncMobiBook.getLong(offset + 0x1c);
mMobiVersion = (int)mEncMobiBook.getLong(offset + 0x68);
if ((mMobiLength >= 0xE4) && (mMobiVersion >= 5))
{
mExtraDataFlags = mEncMobiBook.getShort(offset + 0xF2);
}
if (mCompression != 17480)
{
// multibyte utf8 data is included in the encryption for PalmDoc compression
// so clear that byte so that we leave it to be decrypted.
mExtraDataFlags &= 0xFFFE;
}
//if exth region exists parse it for metadata array
int exthFlag = (int)mEncMobiBook.getLong(offset + 0x80);
int exthOffset = 16 + mMobiLength;
if ((exthFlag & 0x40) > 0)
{
if ((exthOffset + mEncMobiBook.size() >= 4) && System.Text.Encoding.Default.GetString(mEncMobiBook.byteSlice(exthOffset + offset, 4)).Equals("EXTH"))
{
int nItems = (int)mEncMobiBook.getLong(exthOffset + offset + 8);
int pos = offset + exthOffset + 12;
for (int i = 0; i < nItems - 1; i++)
{
int type = (int)mEncMobiBook.getLong(pos);
int size = (int)mEncMobiBook.getLong(pos + 4);
mMetaMap[type] = mEncMobiBook.byteSlice(pos + 8, size - 8);
/* TODO:
# reset the text to speech flag and clipping limit, if present
# if type == 401 and size == 9:
# set clipping limit to 100%
# self.patchSection(0, "\144", 16 + self.mobi_length + pos + 8)
# elif type == 404 and size == 9:
# make sure text to speech is enabled
# self.patchSection(0, "\0", 16 + self.mobi_length + pos + 8)
*/
pos += size;
}
}
}
Debug.WriteLine(mHeader);
Debug.WriteLine("BookTitle: {0} \nMobiLength: {1} \nMobiCodePage {2}\nExtraDataFlags: {3} \nMobiVersion: {4}\n", getBookTitle(), mMobiLength, mMobiCodepage, mExtraDataFlags, mMobiVersion);
List <byte[]> pidList = new List <byte[]>();
pidList.Add(Encoding.Default.GetBytes("DL3pB54YXE"));
pidList.Add(Encoding.Default.GetBytes("DL3pB54Y"));
pidList.Add(Encoding.Default.GetBytes("SSEVC1U7"));
processBook(pidList);
}