private static void Transcode(Stream applefileStream, Stream dataForkStream, Stream outAttachMacInfo, Stream outMacBinStream, ref Stream outDataForkStream, out string fileName, out byte[] additionalInfo)
{
if (applefileStream.Length < 26L)
{
throw new MimeException(EmailMessageStrings.UnexpectedEndOfStream);
}
int num = MimeAppleTranscoder.ReadUIntFromStream(applefileStream);
if (num != 333319 && num != 333312)
{
if (dataForkStream != null)
{
throw new MimeException(EmailMessageStrings.WrongAppleMagicNumber);
}
applefileStream.Position = 0L;
MimeAppleTranscoder.MacBinToApplefile(applefileStream, outAttachMacInfo, out fileName, out additionalInfo);
applefileStream.Position = 0L;
if (outMacBinStream == null)
{
return;
}
MimeAppleTranscoder.CopyStreamData(applefileStream, outMacBinStream);
return;
}
else
{
fileName = null;
byte[] array = new byte[128];
array[0] = 0;
int num2 = 0;
if (dataForkStream != null)
{
num2 = 83;
MimeAppleTranscoder.WriteIntData((int)dataForkStream.Length, array, ref num2);
}
byte[] bytes = MimeAppleTranscoder.macEncoding.GetBytes("mBIN");
for (int i = 0; i < 4; i++)
{
array[102 + i] = bytes[i];
}
array[122] = 130;
array[123] = 129;
int inputOffset = 0;
MimeAppleTranscoder.EntryDescriptor entryDescriptor = null;
int inputOffset2 = 0;
List <MimeAppleTranscoder.EntryDescriptor> list = MimeAppleTranscoder.ReadAppleFileHeaderEntries(applefileStream);
foreach (MimeAppleTranscoder.EntryDescriptor entryDescriptor2 in list)
{
switch (entryDescriptor2.EntryId)
{
case 1:
entryDescriptor = entryDescriptor2;
num2 = 83;
MimeAppleTranscoder.WriteIntData(entryDescriptor2.EntryLength, array, ref num2);
break;
case 2:
inputOffset = entryDescriptor2.EntryOffset;
num2 = 87;
MimeAppleTranscoder.WriteIntData(entryDescriptor2.EntryLength, array, ref num2);
break;
case 4:
inputOffset2 = entryDescriptor2.EntryOffset;
num2 = 99;
MimeAppleTranscoder.WriteShortData(entryDescriptor2.EntryLength, array, ref num2);
break;
}
}
if (entryDescriptor != null)
{
list.Remove(entryDescriptor);
}
if (outAttachMacInfo != null)
{
MimeAppleTranscoder.WriteApplefileHeader(list, true, outAttachMacInfo);
}
int num3 = (int)applefileStream.Position;
foreach (MimeAppleTranscoder.EntryDescriptor entryDescriptor3 in list)
{
if (entryDescriptor3.EntryOffset < num3)
{
throw new MimeException(EmailMessageStrings.WrongOffsetsInApplefile);
}
if (entryDescriptor3.EntryOffset > num3)
{
if (applefileStream.Length < (long)entryDescriptor3.EntryOffset)
{
throw new MimeException(EmailMessageStrings.WrongOffsetsInApplefile);
}
applefileStream.Position = (long)entryDescriptor3.EntryOffset;
}
if (entryDescriptor3.EntryLength < 0)
{
throw new MimeException(EmailMessageStrings.EntryLengthTooBigInApplefile((long)((ulong)entryDescriptor3.EntryLength)));
}
int num4 = 0;
byte[] array2 = null;
int entryId = entryDescriptor3.EntryId;
if (entryId != 3)
{
switch (entryId)
{
case 8:
num4 = Math.Min(8, entryDescriptor3.EntryLength);
array2 = new byte[num4];
MimeAppleTranscoder.ReadFixed(applefileStream, array2, 0, num4);
for (int j = 0; j < num4; j++)
{
array[91 + j] = array2[j];
}
break;
case 9:
num4 = Math.Min(28, entryDescriptor3.EntryLength);
array2 = new byte[num4];
MimeAppleTranscoder.ReadFixed(applefileStream, array2, 0, num4);
if (num4 >= 16)
{
for (int k = 0; k < 16; k++)
{
array[65 + k] = array2[k];
}
array[101] = array[73];
array[73] = array[74];
array[74] = 0;
if (num4 >= 22)
{
array[106] = array2[20];
array[107] = array2[21];
}
}
break;
case 10:
num4 = Math.Min(4, entryDescriptor3.EntryLength);
array2 = new byte[num4];
MimeAppleTranscoder.ReadFixed(applefileStream, array2, 0, num4);
if (num4 == 4)
{
array[81] = (byte)((array2[3] & 2) >> 1);
}
break;
}
}
else
{
num4 = Math.Min(63, entryDescriptor3.EntryLength);
array2 = new byte[num4];
MimeAppleTranscoder.ReadFixed(applefileStream, array2, 0, num4);
fileName = MimeAppleTranscoder.macEncoding.GetString(array2, 0, num4);
array[1] = (byte)num4;
for (int l = 0; l < num4; l++)
{
array[2 + l] = array2[l];
}
}
if (outAttachMacInfo != null)
{
if (array2 != null)
{
outAttachMacInfo.Write(array2, 0, num4);
}
if (num4 != entryDescriptor3.EntryLength)
{
MimeAppleTranscoder.CopyStreamData(applefileStream, outAttachMacInfo, new int?(entryDescriptor3.EntryLength - num4));
}
}
num3 = (int)applefileStream.Position;
}
num2 = 124;
MimeAppleTranscoder.WriteUShortData((int)MimeAppleTranscoder.CalcCRC16(array, 126), array, ref num2);
MacBinaryHeader macBinaryHeader = new MacBinaryHeader(array);
if (outMacBinStream == null)
{
additionalInfo = null;
if (outDataForkStream != null)
{
ReadableDataStorageOnStream readableDataStorageOnStream = new ReadableDataStorageOnStream(applefileStream, false);
if (entryDescriptor != null)
{
outDataForkStream = readableDataStorageOnStream.OpenReadStream((long)entryDescriptor.EntryOffset, (long)(entryDescriptor.EntryOffset + (int)macBinaryHeader.DataForkLength));
return;
}
outDataForkStream = readableDataStorageOnStream.OpenReadStream(0L, 0L);
}
return;
}
additionalInfo = MimeAppleTranscoder.EncodeAdditionalInfo(macBinaryHeader.FileCreator, macBinaryHeader.FileType);
outMacBinStream.Write(array, 0, array.Length);
if (macBinaryHeader.DataForkLength > 0L)
{
if (dataForkStream != null)
{
MimeAppleTranscoder.CopyStreamData(dataForkStream, outMacBinStream);
MimeAppleTranscoder.WriteMacBinPadding(outMacBinStream, (int)macBinaryHeader.DataForkLength);
}
else if (entryDescriptor != null)
{
MimeAppleTranscoder.CopyDataWithPadding(applefileStream, outMacBinStream, entryDescriptor.EntryOffset, (int)macBinaryHeader.DataForkLength);
}
}
if (macBinaryHeader.ResourceForkLength > 0L)
{
MimeAppleTranscoder.CopyDataWithPadding(applefileStream, outMacBinStream, inputOffset, (int)macBinaryHeader.ResourceForkLength);
}
if (macBinaryHeader.GetInfoLength > 0)
{
MimeAppleTranscoder.CopyDataWithPadding(applefileStream, outMacBinStream, inputOffset2, macBinaryHeader.GetInfoLength);
}
return;
}
}