private void WriteHeader(System.IO.Stream s, byte[] bytes)
{
// write the header info
int i = 0;
// signature
bytes[i++] = (byte)(ZipEntrySignature & 0x000000FF);
bytes[i++] = (byte)((ZipEntrySignature & 0x0000FF00) >> 8);
bytes[i++] = (byte)((ZipEntrySignature & 0x00FF0000) >> 16);
bytes[i++] = (byte)((ZipEntrySignature & 0xFF000000) >> 24);
// version needed
Int16 FixedVersionNeeded = 0x14; // from examining existing zip files
bytes[i++] = (byte)(FixedVersionNeeded & 0x00FF);
bytes[i++] = (byte)((FixedVersionNeeded & 0xFF00) >> 8);
// bitfield
Int16 BitField = 0x00; // from examining existing zip files
bytes[i++] = (byte)(BitField & 0x00FF);
bytes[i++] = (byte)((BitField & 0xFF00) >> 8);
// compression method
Int16 CompressionMethod = 0x08; // 0x08 = Deflate
bytes[i++] = (byte)(CompressionMethod & 0x00FF);
bytes[i++] = (byte)((CompressionMethod & 0xFF00) >> 8);
// LastMod
bytes[i++] = (byte)(_LastModDateTime & 0x000000FF);
bytes[i++] = (byte)((_LastModDateTime & 0x0000FF00) >> 8);
bytes[i++] = (byte)((_LastModDateTime & 0x00FF0000) >> 16);
bytes[i++] = (byte)((_LastModDateTime & 0xFF000000) >> 24);
// CRC32 (Int32)
CRC32 crc32 = new CRC32();
UInt32 crc = 0;
using (System.IO.Stream input = System.IO.File.OpenRead(FileName)) {
crc = crc32.GetCrc32AndCopy(input, CompressedStream);
}
CompressedStream.Close(); // to get the footer bytes written to the underlying stream
bytes[i++] = (byte)(crc & 0x000000FF);
bytes[i++] = (byte)((crc & 0x0000FF00) >> 8);
bytes[i++] = (byte)((crc & 0x00FF0000) >> 16);
bytes[i++] = (byte)((crc & 0xFF000000) >> 24);
// CompressedSize (Int32)
Int32 isz = (Int32)_UnderlyingMemoryStream.Length;
UInt32 sz = (UInt32)isz;
bytes[i++] = (byte)(sz & 0x000000FF);
bytes[i++] = (byte)((sz & 0x0000FF00) >> 8);
bytes[i++] = (byte)((sz & 0x00FF0000) >> 16);
bytes[i++] = (byte)((sz & 0xFF000000) >> 24);
// UncompressedSize (Int32)
if (_Debug)
{
System.Console.WriteLine("Uncompressed Size: {0}", crc32.TotalBytesRead);
}
bytes[i++] = (byte)(crc32.TotalBytesRead & 0x000000FF);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0x0000FF00) >> 8);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0x00FF0000) >> 16);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0xFF000000) >> 24);
// filename length (Int16)
Int16 length = (Int16)FileName.Length;
// see note below about TrimVolumeFromFullyQualifiedPaths.
if ((TrimVolumeFromFullyQualifiedPaths) && (FileName[1] == ':') && (FileName[2] == '\\'))
{
length -= 3;
}
bytes[i++] = (byte)(length & 0x00FF);
bytes[i++] = (byte)((length & 0xFF00) >> 8);
// extra field length (short)
Int16 ExtraFieldLength = 0x00;
bytes[i++] = (byte)(ExtraFieldLength & 0x00FF);
bytes[i++] = (byte)((ExtraFieldLength & 0xFF00) >> 8);
// Tue, 27 Mar 2007 16:35
// Creating a zip that contains entries with "fully qualified" pathnames
// can result in a zip archive that is unreadable by Windows Explorer.
// Such archives are valid according to other tools but not to explorer.
// To avoid this, we can trim off the leading volume name and slash (eg
// c:\) when creating (writing) a zip file. We do this by default and we
// leave the old behavior available with the
// TrimVolumeFromFullyQualifiedPaths flag - set it to false to get the old
// behavior. It only affects zip creation.
// actual filename
char[] c = ((TrimVolumeFromFullyQualifiedPaths) && (FileName[1] == ':') && (FileName[2] == '\\')) ?
FileName.Substring(3).ToCharArray() : // trim off volume letter, colon, and slash
FileName.ToCharArray();
int j = 0;
if (_Debug)
{
System.Console.WriteLine("local header: writing filename, {0} chars", c.Length);
System.Console.WriteLine("starting offset={0}", i);
}
for (j = 0; (j < c.Length) && (i + j < bytes.Length); j++)
{
bytes[i + j] = System.BitConverter.GetBytes(c[j])[0];
if (_Debug)
{
System.Console.Write(" {0:X2}", bytes[i + j]);
}
}
if (_Debug)
{
System.Console.WriteLine();
}
i += j;
// extra field (we always write nothing in this implementation)
// ;;
// remember the file offset of this header
_RelativeOffsetOfHeader = (int)s.Length;
if (_Debug)
{
System.Console.WriteLine("\nAll header data:");
for (j = 0; j < i; j++)
{
System.Console.Write(" {0:X2}", bytes[j]);
}
System.Console.WriteLine();
}
// finally, write the header to the stream
s.Write(bytes, 0, i);
// preserve this header data for use with the central directory structure.
_header = new byte[i];
if (_Debug)
{
System.Console.WriteLine("preserving header of {0} bytes", _header.Length);
}
for (j = 0; j < i; j++)
{
_header[j] = bytes[j];
}
}
private void WriteHeader(System.IO.Stream s, byte[] bytes) {
// write the header info
int i = 0;
// signature
bytes[i++] = (byte)(ZipEntrySignature & 0x000000FF);
bytes[i++] = (byte)((ZipEntrySignature & 0x0000FF00) >> 8);
bytes[i++] = (byte)((ZipEntrySignature & 0x00FF0000) >> 16);
bytes[i++] = (byte)((ZipEntrySignature & 0xFF000000) >> 24);
// version needed
Int16 FixedVersionNeeded = 0x14; // from examining existing zip files
bytes[i++] = (byte)(FixedVersionNeeded & 0x00FF);
bytes[i++] = (byte)((FixedVersionNeeded & 0xFF00) >> 8);
// bitfield
Int16 BitField = 0x00; // from examining existing zip files
bytes[i++] = (byte)(BitField & 0x00FF);
bytes[i++] = (byte)((BitField & 0xFF00) >> 8);
// compression method
Int16 CompressionMethod = 0x08; // 0x08 = Deflate
bytes[i++] = (byte)(CompressionMethod & 0x00FF);
bytes[i++] = (byte)((CompressionMethod & 0xFF00) >> 8);
// LastMod
bytes[i++] = (byte)(_LastModDateTime & 0x000000FF);
bytes[i++] = (byte)((_LastModDateTime & 0x0000FF00) >> 8);
bytes[i++] = (byte)((_LastModDateTime & 0x00FF0000) >> 16);
bytes[i++] = (byte)((_LastModDateTime & 0xFF000000) >> 24);
// CRC32 (Int32)
CRC32 crc32 = new CRC32();
UInt32 crc = 0;
using (System.IO.Stream input = System.IO.File.OpenRead(FileName)) {
crc = crc32.GetCrc32AndCopy(input, CompressedStream);
}
CompressedStream.Close(); // to get the footer bytes written to the underlying stream
bytes[i++] = (byte)(crc & 0x000000FF);
bytes[i++] = (byte)((crc & 0x0000FF00) >> 8);
bytes[i++] = (byte)((crc & 0x00FF0000) >> 16);
bytes[i++] = (byte)((crc & 0xFF000000) >> 24);
// CompressedSize (Int32)
Int32 isz = (Int32)_UnderlyingMemoryStream.Length;
UInt32 sz = (UInt32)isz;
bytes[i++] = (byte)(sz & 0x000000FF);
bytes[i++] = (byte)((sz & 0x0000FF00) >> 8);
bytes[i++] = (byte)((sz & 0x00FF0000) >> 16);
bytes[i++] = (byte)((sz & 0xFF000000) >> 24);
// UncompressedSize (Int32)
if (_Debug)
System.Console.WriteLine("Uncompressed Size: {0}", crc32.TotalBytesRead);
bytes[i++] = (byte)(crc32.TotalBytesRead & 0x000000FF);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0x0000FF00) >> 8);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0x00FF0000) >> 16);
bytes[i++] = (byte)((crc32.TotalBytesRead & 0xFF000000) >> 24);
// filename length (Int16)
Int16 length = (Int16)FileName.Length;
// see note below about TrimVolumeFromFullyQualifiedPaths.
if ((TrimVolumeFromFullyQualifiedPaths) && (FileName[1] == ':') && (FileName[2] == '\\'))
length -= 3;
bytes[i++] = (byte)(length & 0x00FF);
bytes[i++] = (byte)((length & 0xFF00) >> 8);
// extra field length (short)
Int16 ExtraFieldLength = 0x00;
bytes[i++] = (byte)(ExtraFieldLength & 0x00FF);
bytes[i++] = (byte)((ExtraFieldLength & 0xFF00) >> 8);
// Tue, 27 Mar 2007 16:35
// Creating a zip that contains entries with "fully qualified" pathnames
// can result in a zip archive that is unreadable by Windows Explorer.
// Such archives are valid according to other tools but not to explorer.
// To avoid this, we can trim off the leading volume name and slash (eg
// c:\) when creating (writing) a zip file. We do this by default and we
// leave the old behavior available with the
// TrimVolumeFromFullyQualifiedPaths flag - set it to false to get the old
// behavior. It only affects zip creation.
// actual filename
char[] c = ((TrimVolumeFromFullyQualifiedPaths) && (FileName[1] == ':') && (FileName[2] == '\\')) ?
FileName.Substring(3).ToCharArray() : // trim off volume letter, colon, and slash
FileName.ToCharArray();
int j = 0;
if (_Debug) {
System.Console.WriteLine("local header: writing filename, {0} chars", c.Length);
System.Console.WriteLine("starting offset={0}", i);
}
for (j = 0; (j < c.Length) && (i + j < bytes.Length); j++) {
bytes[i + j] = System.BitConverter.GetBytes(c[j])[0];
if (_Debug)
System.Console.Write(" {0:X2}", bytes[i + j]);
}
if (_Debug)
System.Console.WriteLine();
i += j;
// extra field (we always write nothing in this implementation)
// ;;
// remember the file offset of this header
_RelativeOffsetOfHeader = (int)s.Length;
if (_Debug) {
System.Console.WriteLine("\nAll header data:");
for (j = 0; j < i; j++)
System.Console.Write(" {0:X2}", bytes[j]);
System.Console.WriteLine();
}
// finally, write the header to the stream
s.Write(bytes, 0, i);
// preserve this header data for use with the central directory structure.
_header = new byte[i];
if (_Debug)
System.Console.WriteLine("preserving header of {0} bytes", _header.Length);
for (j = 0; j < i; j++)
_header[j] = bytes[j];
}
