static WriterZipEntry BuildEntry(Stream ms, string file, Func <byte[]> dataGetter)
{
bool FileOnDisk = dataGetter == null;
WriterZipEntry entry = new WriterZipEntry();
entry.MainOffset = ms.Position;
entry.Filename = FileOnDisk ? Path.GetFileName(file) : file;
//Header
ms.Write(BitConverter.GetBytes(ZipReader.filemagic), 0, 4);
ms.Write(BitConverter.GetBytes(MinVers), 0, 2);
ms.Write(BitConverter.GetBytes(BitFlag), 0, 2);
ms.Write(BitConverter.GetBytes(ComprMethod), 0, 2);
//Date/time
DateTime date = FileOnDisk ? new FileInfo(file).LastWriteTime : DateTime.Now;
ushort secs = 0;
ushort mins = 0;
ushort hours = 0;
ushort day = 0;
ushort month = 0;
ushort year = 0;
secs = (ushort)date.Second;
mins = (ushort)date.Minute;
hours = (ushort)date.Hour;
ushort datetime = (ushort)(secs / 2);
datetime |= (ushort)(mins >> 5);
datetime |= (ushort)(hours >> 11);
ms.Write(BitConverter.GetBytes(datetime), 0, 2);
entry.Time = datetime;
day = (ushort)date.Day;
month = (ushort)date.Month;
year = (ushort)date.Year;
datetime = day;
datetime &= (ushort)(month >> 5);
datetime &= (ushort)(year >> 9);
ms.Write(BitConverter.GetBytes(datetime), 0, 2);
entry.Date = datetime;
byte[] comprData;
Stream dataStream = null;
if (FileOnDisk)
{
dataStream = new FileStream(file, FileMode.Open, FileAccess.Read);
}
else
{
dataStream = new MemoryStream(dataGetter());
}
using (dataStream)
{
byte[] buff = new byte[dataStream.Length];
dataStream.Read(buff, 0, buff.Length);
// create and write local header
entry.CRC32 = crc.BlockChecksum(buff);
entry.UncLen = (UInt32)dataStream.Length;
ms.Write(BitConverter.GetBytes(entry.CRC32), 0, 4);
ms.Seek(4, SeekOrigin.Current); // Skip compressed size
ms.Write(BitConverter.GetBytes(entry.UncLen), 0, 4);
if (entry.Filename.ToLower().Contains("meresults"))
{
entry.Filename = "texmod.def";
}
ms.Write(BitConverter.GetBytes((ushort)entry.Filename.Length), 0, 2);
ms.Write(BitConverter.GetBytes((ushort)0), 0, 2); // extra
// Filename
foreach (char c in entry.Filename)
{
ms.WriteByte((byte)c);
}
dataStream.Seek(0, SeekOrigin.Begin); // Rewind to compress entry
using (MemoryStream ms2 = new MemoryStream())
{
using (DeflateStream deflator = new DeflateStream(ms2, CompressionMode.Compress))
dataStream.CopyTo(deflator);
comprData = ms2.ToArray();
}
entry.ComprLen = (uint)comprData.Length + 12; // 12 is crypt header
ZipCrypto.EncryptData(ms, comprData, entry.CRC32); // Encrypt and write data
}
// Footer
ms.Write(BitConverter.GetBytes(ZipReader.datadescriptormagic), 0, 4);
ms.Write(BitConverter.GetBytes(entry.CRC32), 0, 4);
ms.Write(BitConverter.GetBytes(entry.ComprLen), 0, 4);
ms.Write(BitConverter.GetBytes(entry.UncLen), 0, 4);
// Go back and write compressed length
ms.Seek(entry.MainOffset + 18, SeekOrigin.Begin);
ms.Write(BitConverter.GetBytes(entry.ComprLen), 0, 4);
// Go to end for next entry
ms.Seek(0, SeekOrigin.End);
return(entry);
}
//public const UInt32 ExternalAttr = 0x81B40020; // Texmod uses this one but ours won't work if we do...
static WriterZipEntry BuildEntry(Stream ms, string file, Func<byte[]> dataGetter)
{
bool FileOnDisk = dataGetter == null;
WriterZipEntry entry = new WriterZipEntry();
entry.MainOffset = ms.Position;
entry.Filename = FileOnDisk ? Path.GetFileName(file) : file;
//Header
ms.Write(BitConverter.GetBytes(ZipReader.filemagic), 0, 4);
ms.Write(BitConverter.GetBytes(MinVers), 0, 2);
ms.Write(BitConverter.GetBytes(BitFlag), 0, 2);
ms.Write(BitConverter.GetBytes(ComprMethod), 0, 2);
//Date/time
DateTime date = FileOnDisk ? new FileInfo(file).LastWriteTime : DateTime.Now;
ushort secs = 0;
ushort mins = 0;
ushort hours = 0;
ushort day = 0;
ushort month = 0;
ushort year = 0;
secs = (ushort)date.Second;
mins = (ushort)date.Minute;
hours = (ushort)date.Hour;
ushort datetime = (ushort)(secs / 2);
datetime |= (ushort)(mins >> 5);
datetime |= (ushort)(hours >> 11);
ms.Write(BitConverter.GetBytes(datetime), 0, 2);
entry.Time = datetime;
day = (ushort)date.Day;
month = (ushort)date.Month;
year = (ushort)date.Year;
datetime = day;
datetime &= (ushort)(month >> 5);
datetime &= (ushort)(year >> 9);
ms.Write(BitConverter.GetBytes(datetime), 0, 2);
entry.Date = datetime;
byte[] comprData;
Stream dataStream = null;
if (FileOnDisk)
dataStream = new FileStream(file, FileMode.Open, FileAccess.Read);
else
dataStream = new MemoryStream(dataGetter());
using (dataStream)
{
byte[] buff = new byte[dataStream.Length];
dataStream.Read(buff, 0, buff.Length);
// create and write local header
entry.CRC32 = CRC32.BlockChecksum(buff);
entry.UncLen = (UInt32)dataStream.Length;
ms.Write(BitConverter.GetBytes(entry.CRC32), 0, 4);
ms.Seek(4, SeekOrigin.Current); // Skip compressed size
ms.Write(BitConverter.GetBytes(entry.UncLen), 0, 4);
if (entry.Filename.ToLower().Contains("meresults"))
entry.Filename = "texmod.def";
ms.Write(BitConverter.GetBytes((ushort)entry.Filename.Length), 0, 2);
ms.Write(BitConverter.GetBytes((ushort)0), 0, 2); // extra
// Filename
foreach (char c in entry.Filename)
ms.WriteByte((byte)c);
dataStream.Seek(0, SeekOrigin.Begin); // Rewind to compress entry
using (MemoryStream ms2 = new MemoryStream())
{
using (DeflateStream deflator = new DeflateStream(ms2, CompressionMode.Compress))
dataStream.CopyTo(deflator);
comprData = ms2.ToArray();
}
entry.ComprLen = (uint)comprData.Length + 12; // 12 is crypt header
ZipCrypto.EncryptData(ms, comprData, entry.CRC32); // Encrypt and write data
}
// Footer
ms.Write(BitConverter.GetBytes(ZipReader.datadescriptormagic), 0, 4);
ms.Write(BitConverter.GetBytes(entry.CRC32), 0, 4);
ms.Write(BitConverter.GetBytes(entry.ComprLen), 0, 4);
ms.Write(BitConverter.GetBytes(entry.UncLen), 0, 4);
// Go back and write compressed length
ms.Seek(entry.MainOffset + 18, SeekOrigin.Begin);
ms.Write(BitConverter.GetBytes(entry.ComprLen), 0, 4);
// Go to end for next entry
ms.Seek(0, SeekOrigin.End);
return entry;
}
