////////////////////////////////////////////////////////////////////
// Save directory path in the ZIP directory
////////////////////////////////////////////////////////////////////
public Boolean SaveDirectoryPath
(
String FullFileName,
String ArchiveFileName
)
{
try
{
// write zip file header for directory path
WriteFileHeader(FullFileName, ArchiveFileName);
// save file header
ZipDir.Insert(~ZipDir.BinarySearch(FileHeaderInfo), FileHeaderInfo);
// successful exit
return(false);
}
// catch exceptions and save the exception error message and stack
catch (Exception Ex)
{
// remove any information written to the file
WriteStream.SetLength(WriteStartPosition);
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Delete central directory entry
////////////////////////////////////////////////////////////////////
public Boolean Delete
(
Int32 ZipDirIndex
)
{
try
{
// delete the entry
ZipDir.RemoveAt(ZipDirIndex);
}
// catch exceptions and save the exception error message and stack
catch (Exception Ex)
{
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
// set delete mode flag for save archive
DeleteMode = true;
// successful exit
return(false);
}
////////////////////////////////////////////////////////////////////
// Decompress one file
////////////////////////////////////////////////////////////////////
public Boolean Compress
(
String FullFileName,
String ArchiveFileName
)
{
try
{
// write zip file header
WriteFileHeader(FullFileName, ArchiveFileName);
// open source file for reading
ReadStream = new FileStream(ReadFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
ReadFile = new BinaryReader(ReadStream, Encoding.UTF8);
// uncompressed file length
ReadRemain = (UInt32)ReadStream.Length;
// reset CRC32 checksum
ReadCRC32 = 0;
// compress the file
Compress();
// close read file
ReadFile.Close();
ReadFile = null;
// update zip file header with input file crc and compressed file length
UpdateZipFileHeader();
// successful exit
return(false);
}
// catch exceptions and save the exception error message and stack
catch (Exception Ex)
{
// close the read file if it is open
if (ReadFile != null)
{
ReadFile.Close();
ReadFile = null;
}
// remove any information written to the file
WriteStream.SetLength(WriteStartPosition);
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Save ZIP Archive
////////////////////////////////////////////////////////////////////
public Boolean SaveArchive()
{
try
{
// zip directory is empty
if (ZipDir.Count == 0)
{
// close and delete the file
WriteFile.Close();
WriteFile = null;
File.Delete(WriteFileName);
}
else
{
// one or more files were deleted
if (DeleteMode)
{
DeleteFiles();
}
// write zip file directory
ZipFileDirectory();
// close file
WriteFile.Close();
WriteFile = null;
// clear directory
ZipDir.Clear();
}
// successful exit
return(false);
}
// catch exceptions and save the exception error message and stack
catch (Exception Ex)
{
// close the write file if it is open
CloseZipFile();
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Create ZIP Archive
////////////////////////////////////////////////////////////////////
public Boolean CreateArchive
(
String WriteFileName
)
{
try
{
// save name
this.WriteFileName = WriteFileName;
// create destination file
WriteStream = new FileStream(WriteFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None);
// convert stream to binary writer
WriteFile = new BinaryWriter(WriteStream, Encoding.UTF8);
// convert stream to binary reader
WriteFileReader = new BinaryReader(WriteStream, Encoding.UTF8);
// create empty zip file directory
ZipDir = new List <FileHeader>();
// reset zip directory position
ZipDirPosition = 0;
// reset delete mode
DeleteMode = false;
// successful exit
return(false);
}
// catch exceptions and save the exception error message and stack
catch (Exception Ex)
{
// close the write file if it is open
CloseZipFile();
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
/////////////////////////////////////////////////////////////////////
// Open ZIP file and read file directory
/////////////////////////////////////////////////////////////////////
public Boolean OpenZipFile
(
String ReadFileName
)
{
// trap errors
try
{
// save name
this.ReadFileName = ReadFileName;
// open source file for reading
ReadStream = new FileStream(ReadFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
ReadFile = new BinaryReader(ReadStream, Encoding.UTF8);
// file is too long
if (ReadStream.Length > (Int64)0xffffffff)
{
throw new ApplicationException("No support for files over 4GB");
}
// read zip directory
ReadZipFileDirectory();
// successful exit
return(false);
}
// make sure read file is closed
catch (Exception Ex)
{
// close the read file if it is open
CloseZipFile();
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Decompress one file
////////////////////////////////////////////////////////////////////
public Boolean Decompress
(
String ReadFileName,
String WriteFileName
)
{
try
{
// save name
this.ReadFileName = ReadFileName;
// open source file for reading
ReadStream = new FileStream(ReadFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
ReadFile = new BinaryReader(ReadStream, Encoding.UTF8);
// file is too long
if (ReadStream.Length > (Int64)0xffffffff)
{
throw new ApplicationException("No support for files over 4GB");
}
// compressed part of the file
// we subtract 2 bytes for header and 4 bytes for adler32 checksum
ReadRemain = (UInt32)ReadStream.Length - 6;
ReadTotal = ReadRemain;
// get ZLib header
Int32 Header = (ReadFile.ReadByte() << 8) | ReadFile.ReadByte();
// test header: chksum, compression method must be deflated, no support for external dictionary
if (Header % 31 != 0 || (Header & 0xf00) != 0x800 && (Header & 0xf00) != 0 || (Header & 0x20) != 0)
{
throw new ApplicationException("ZLIB file header is in error");
}
// save name
this.WriteFileName = WriteFileName;
// create destination file
WriteStream = new FileStream(WriteFileName, FileMode.Create, FileAccess.Write, FileShare.None);
// convert stream to binary writer
WriteFile = new BinaryWriter(WriteStream, Encoding.UTF8);
// reset adler32 checksum
WriteAdler32 = 1;
// decompress the file
if ((Header & 0xf00) == 0x800)
{
Decompress();
}
else
{
NoCompression();
}
// ZLib checksum is Adler32
if ((((UInt32)ReadFile.ReadByte() << 24) | ((UInt32)ReadFile.ReadByte() << 16) |
((UInt32)ReadFile.ReadByte() << 8) | ((UInt32)ReadFile.ReadByte())) != WriteAdler32)
{
throw new ApplicationException("ZLIB file Adler32 test failed");
}
// close read file
ReadFile.Close();
ReadFile = null;
// save file length
WriteTotal = (UInt32)WriteStream.Length;
// close write file
WriteFile.Close();
WriteFile = null;
// successful exit
return(false);
}
// make sure read and write files are closed
catch (Exception Ex)
{
// close the read file if it is open
if (ReadFile != null)
{
ReadFile.Close();
ReadFile = null;
}
// close the write file if it is open
if (WriteFile != null)
{
WriteFile.Close();
WriteFile = null;
}
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Compress one file
////////////////////////////////////////////////////////////////////
public Boolean Compress
(
String ReadFileName,
String WriteFileName
)
{
try
{
// save name
this.ReadFileName = ReadFileName;
// open source file for reading
ReadStream = new FileStream(ReadFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
ReadFile = new BinaryReader(ReadStream, Encoding.UTF8);
// file is too long
if (ReadStream.Length > (Int64)0xffffffff)
{
throw new ApplicationException("No support for files over 4GB");
}
// uncompressed file length
ReadRemain = (UInt32)ReadStream.Length;
// save name
this.WriteFileName = WriteFileName;
// create destination file
WriteStream = new FileStream(WriteFileName, FileMode.Create, FileAccess.Write, FileShare.None);
// convert stream to binary writer
WriteFile = new BinaryWriter(WriteStream, Encoding.UTF8);
// compress the file (function defind in DeflateMethod the base class)
Compress();
// close read file
ReadFile.Close();
ReadFile = null;
// close write file
WriteFile.Close();
WriteFile = null;
// successful exit
return(false);
}
// make sure read and write files are closed
catch (Exception Ex)
{
// close the read file if it is open
if (ReadFile != null)
{
ReadFile.Close();
ReadFile = null;
}
// close the write file if it is open
if (WriteFile != null)
{
WriteFile.Close();
WriteFile = null;
}
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Decompress ZIP file
////////////////////////////////////////////////////////////////////
public Boolean DecompressZipFile
(
FileHeader FH,
String RootPathName, // save the decompressed file in this directory
String NewFileName, // if this file name is given it overwrite the name in the FH structure
Boolean CreatePath,
Boolean OverWrite
)
{
try
{
// save file header
FileHeaderInfo = FH;
// read file header for this file and compare it to the directory information
ReadFileHeader(FileHeaderInfo.FilePos);
// compressed length
ReadRemain = FileHeaderInfo.CompSize;
ReadTotal = ReadRemain;
// build write file name
// Root name (optional) plus either original name or a new name
WriteFileName = (String.IsNullOrEmpty(RootPathName) ? String.Empty :
(RootPathName.EndsWith("\\") ? RootPathName : RootPathName + "\\")) +
(String.IsNullOrEmpty(NewFileName) ? FH.FileName : NewFileName);
// test if write file name has a path component
Int32 Ptr = WriteFileName.LastIndexOf('\\');
if (Ptr >= 0)
{
// make sure directory exists
if (!Directory.Exists(WriteFileName.Substring(0, Ptr)))
{
// make a new folder
if (CreatePath)
{
Directory.CreateDirectory(WriteFileName.Substring(0, Ptr));
}
// error
else
{
throw new ApplicationException("Extract file failed. Invalid directory path");
}
}
}
// create destination file
WriteStream = new FileStream(WriteFileName, OverWrite ? FileMode.Create : FileMode.CreateNew, FileAccess.Write, FileShare.None);
// convert stream to binary writer
WriteFile = new BinaryWriter(WriteStream, Encoding.UTF8);
// reset crc32 checksum
WriteCRC32 = 0;
// switch based on compression method
switch (FileHeaderInfo.CompMethod)
{
// no compression
case 0:
NoCompression();
break;
// deflate compress method
case 8:
// decompress file
Decompress();
break;
// not supported
default:
throw new ApplicationException("Unsupported compression method");
}
// Zip file checksum is CRC32
if (FileHeaderInfo.FileCRC32 != WriteCRC32)
{
throw new ApplicationException("ZIP file CRC test failed");
}
// save file length
WriteTotal = (UInt32)WriteStream.Length;
// close write file
WriteFile.Close();
WriteFile = null;
// if file times are available set the file time
if (FileTimeAvailable)
{
File.SetCreationTime(WriteFileName, FileCreateTime);
File.SetLastWriteTime(WriteFileName, FileModifyTime);
File.SetLastAccessTime(WriteFileName, FileAccessTime);
}
else
{
// convert dos file date and time to DateTime format
DateTime FileDosTime = new DateTime(1980 + ((FileHeaderInfo.FileDate >> 9) & 0x7f),
(FileHeaderInfo.FileDate >> 5) & 0xf, FileHeaderInfo.FileDate & 0x1f,
(FileHeaderInfo.FileTime >> 11) & 0x1f, (FileHeaderInfo.FileTime >> 5) & 0x3f, 2 * (FileHeaderInfo.FileTime & 0x1f));
File.SetCreationTime(WriteFileName, FileDosTime);
File.SetLastWriteTime(WriteFileName, FileDosTime);
File.SetLastAccessTime(WriteFileName, FileDosTime);
}
// set file attribute attributes
if (FileHeaderInfo.FileAttr != 0)
{
File.SetAttributes(WriteFileName, FileHeaderInfo.FileAttr);
}
// successful exit
return(false);
}
// make sure write file is closed
catch (Exception Ex)
{
// close the write file if it is open
if (WriteFile != null)
{
WriteFile.Close();
WriteFile = null;
}
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// Compare Files
////////////////////////////////////////////////////////////////////
private Boolean CompareFiles()
{
FileStream Stream1, Stream2;
BinaryReader File1 = null, File2 = null;
Byte[] Buffer1, Buffer2;
// trap errors
try
{
// open file1 for reading
Stream1 = new FileStream(InputFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
File1 = new BinaryReader(Stream1, Encoding.UTF8);
// open file2 for reading
Stream2 = new FileStream(DecompFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
File2 = new BinaryReader(Stream2, Encoding.UTF8);
// length must be the same
if (Stream1.Length != Stream2.Length)
{
throw new ApplicationException("Compare files failed. Files lengths not the same");
}
// allocate buffer
Buffer1 = new Byte[32 * 1024];
Buffer2 = new Byte[32 * 1024];
// compare
Int64 Len = Stream1.Length;
while (Len > 0)
{
Int32 Count = Len < (Int64)Buffer1.Length ? (Int32)Len : Buffer1.Length;
Int32 Act1 = File1.Read(Buffer1, 0, Count);
if (Act1 != Count)
{
throw new ApplicationException("Compare files failed. Reading file1 failed");
}
Int32 Act2 = File2.Read(Buffer2, 0, Count);
if (Act2 != Count)
{
throw new ApplicationException("Compare files failed. Reading file2 failed");
}
Int32 Index;
for (Index = 0; Index < Count && Buffer1[Index] == Buffer2[Index]; Index++)
{
;
}
if (Index != Count)
{
throw new ApplicationException("Compare files failed. The two files are not the same");
}
Len -= Count;
}
File1.Close();
File2.Close();
// successful exit
return(false);
}
catch (Exception Ex)
{
// make sure read file is closed
File1.Close();
File2.Close();
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
////////////////////////////////////////////////////////////////////
// On add button
////////////////////////////////////////////////////////////////////
private void OnAddButton
(
object sender,
EventArgs e
)
{
// get selected list
ListView.SelectedListViewItemCollection SelectedList = FileList.SelectedItems;
// the list is empty
if (SelectedList.Count == 0)
{
return;
}
// trap duplicate file errors
try
{
// zip file root directory
RootDir = (String)DirectoryTree.SelectedNode.Tag;
RootDirPtr = RootDir.Length + 1;
// create empty file list
AddDir = new List <FileHeader>();
// get all selected directories
foreach (ListViewItem Item in SelectedList)
{
if (Item.Tag.GetType() == typeof(DirectoryInfo))
{
ProcessDirectory((DirectoryInfo)Item.Tag);
}
}
// get all selected files in the zip file root directory
foreach (ListViewItem Item in SelectedList)
{
if (Item.Tag.GetType() == typeof(FileInfo))
{
// shortcut for file information
FileInfo FI = (FileInfo)Item.Tag;
// create zip directory file header record with name date time and attributes
FileHeader FH = new FileHeader(FI.FullName.Substring(RootDirPtr), FI.LastWriteTime, FI.Attributes, 0, FI.Length);
// find item poition in the list
Int32 Index = AddDir.BinarySearch(FH);
if (Index >= 0)
{
throw new ApplicationException("Duplicate file name");
}
// add to the list
AddDir.Insert(~Index, FH);
}
}
// save compression level
CompLevel = (Int32)CompLevelUpDown.Value;
// close screen
DialogResult = DialogResult.OK;
return;
}
// error
catch (Exception Ex)
{
// error exit
String[] ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
MessageBox.Show(this, "Add files and folders error\n" + ExceptionStack[0] + "\n" + ExceptionStack[1],
"Add Files Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
return;
}
}
////////////////////////////////////////////////////////////////////
// Decompress one file
////////////////////////////////////////////////////////////////////
public Boolean Compress
(
String ReadFileName,
String WriteFileName
)
{
try
{
// save read file name
this.ReadFileName = ReadFileName;
// open source file for reading
ReadStream = new FileStream(ReadFileName, FileMode.Open, FileAccess.Read, FileShare.Read);
// convert stream to binary reader
ReadFile = new BinaryReader(ReadStream, Encoding.UTF8);
// file is too long
if (ReadStream.Length > (Int64)0xffffffff)
{
throw new ApplicationException("No support for files over 4GB");
}
// uncompressed file length
ReadRemain = (UInt32)ReadStream.Length;
// reset adler32 checksum
ReadAdler32 = 1;
// save name
this.WriteFileName = WriteFileName;
// create destination file
WriteStream = new FileStream(WriteFileName, FileMode.Create, FileAccess.Write, FileShare.None);
// convert stream to binary writer
WriteFile = new BinaryWriter(WriteStream, Encoding.UTF8);
// Header is made out of 16 bits [iiiicccclldxxxxx]
// iiii is compression information. It is WindowBit - 8 in this case 7. iiii = 0111
// cccc is compression method. Deflate (8 dec) or Store (0 dec)
// The first byte is 0x78 for deflate and 0x70 for store
// ll is compression level 0 to 3 (CompLevelTable translates between user level of 0-9 to header level of 0-3)
// d is preset dictionary. The preset dictionary is not supported by this program. d is always 0
// xxx is 5 bit check sum
Int32 Header = (0x78 << 8) | (CompLevelTable[CompressionLevel] << 6);
Header += 31 - (Header % 31);
// write two bytes in most significant byte first
WriteFile.Write((Byte)(Header >> 8));
WriteFile.Write((Byte)Header);
// compress the file
Compress();
// compress function was stored
if (CompFunction == CompFunc.Stored)
{
// set file position to header
WriteStream.Position = 0;
// change compression method from Deflate(8) to Stored(0)
Header = (0x70 << 8) | (CompLevelTable[CompressionLevel] << 6);
Header += 31 - (Header % 31);
// write two bytes in most significant byte first
WriteFile.Write((Byte)(Header >> 8));
WriteFile.Write((Byte)Header);
// restore file position
WriteStream.Position = WriteStream.Length;
}
// ZLib checksum is Adler32 write it big endian order, high byte first
WriteFile.Write((Byte)(ReadAdler32 >> 24));
WriteFile.Write((Byte)(ReadAdler32 >> 16));
WriteFile.Write((Byte)(ReadAdler32 >> 8));
WriteFile.Write((Byte)ReadAdler32);
// close read file
ReadFile.Close();
ReadFile = null;
// close write file
WriteFile.Close();
WriteFile = null;
// successful exit
return(false);
}
// make sure read and write files are closed
catch (Exception Ex)
{
// close the read file if it is open
if (ReadFile != null)
{
ReadFile.Close();
ReadFile = null;
}
// close the write file if it is open
if (WriteFile != null)
{
WriteFile.Close();
WriteFile = null;
}
// error exit
ExceptionStack = ExceptionReport.GetMessageAndStack(this, Ex);
return(true);
}
}
