public void TestCompressDecompress()
{
// get the bytes
byte[] bytes = ExtractTestFolio123();
Assert.IsFalse( bytes.Length == 0, "no bytes read or returned" );
// and compress them
byte[] compressedBytes = null;
using ( MemoryStream ms = new MemoryStream() )
{
using ( ZipOutputStream zos = new ZipOutputStream( ms ) )
{
zos.SetLevel(9); // max compression
// add an entry
zos.PutNextEntry( new ZipEntry( "test" ) );
zos.Write( bytes, 0, bytes.Length );
}
compressedBytes = ms.ToArray();
}
// and decompress
// and compare the returned bytes against the original bytes
byte[] uncompressedBytes = null;
using ( MemoryStream ms = new MemoryStream( compressedBytes ) )
{
// decompress the file
using ( ZipInputStream zis = new ZipInputStream( ms ) )
{
// should only be on entry per file
ZipEntry entry = zis.GetNextEntry();
uncompressedBytes = new byte[ entry.Size ];
zis.Read( uncompressedBytes, 0, (int)entry.Size );
}
}
// and compare them
Assert.AreEqual( bytes.Length, uncompressedBytes.Length, "byte lengths are different" );
for ( int i=0; i < bytes.Length; ++i )
{
Assert.AreEqual( bytes[i], uncompressedBytes[i], "bytes differ at position " + i );
}
}
public static byte[] TryUnCompressByteStream(byte[] compressedBytes)
{
byte[] uncompressedBytes = null;
using (MemoryStream ms = new MemoryStream(compressedBytes))
{
// decompress the file
using (ZipInputStream zis = new ZipInputStream(ms))
{
// should only be on entry per file
ZipEntry entry = zis.GetNextEntry();
uncompressedBytes = new byte[entry.Size];
zis.Read(uncompressedBytes, 0, (int)entry.Size);
}
}
return uncompressedBytes;
}
/// <summary>
/// Unzips and uncompresses a zip file.
/// You should give the full path for the zipFileName.
/// You should give the full path for the rootDirectoryName.
/// Will unzip and uncompress zipFileName and put the files in the location of rootDirectoryName
/// </summary>
/// <param name="zipFileName"></param>
/// <param name="rootDirectoryName"></param>
/// <param name="listFilesUnzipped"></param>
/// <returns></returns>
public static bool TryUnzipAndUncompressFiles(string zipFileName, string rootDirectoryName, out string[] listFilesUnzipped, out string errorMsg)
{
errorMsg = string.Empty;
listFilesUnzipped = null;
List<string> listFiles = new List<string>();
if (!File.Exists(zipFileName))
{
errorMsg = string.Format("The given file name, {0}, does not exists.", zipFileName);
return false;
}
if (rootDirectoryName[rootDirectoryName.Length - 1] != Path.DirectorySeparatorChar)
{
// append directory separator char
rootDirectoryName += Path.DirectorySeparatorChar;
}
if (!Directory.Exists(rootDirectoryName))
Directory.CreateDirectory(rootDirectoryName);
bool ok = false;
using (ZipInputStream s = new ZipInputStream(File.OpenRead(zipFileName)))
{
try
{
ZipEntry theEntry;
while ((theEntry = s.GetNextEntry()) != null)
{
string fullPath = rootDirectoryName + theEntry.Name;
string fileName = fullPath;
if (fullPath.Length > 170)
{
fileName = System.Environment.CurrentDirectory + Path.DirectorySeparatorChar + Guid.NewGuid();
}
//if the directory doesn't exist, we need to create it
string dirName = Path.GetDirectoryName(fileName);
if (!Directory.Exists(dirName))
Directory.CreateDirectory(dirName);
if (File.Exists(fileName))
File.Delete(fileName);
// create the file
using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write))
{
long dataSize = theEntry.Size > 0 ? theEntry.Size : 1024;
byte[] data = new byte[dataSize];
while (true)
{
int size = s.Read(data, 0, data.Length);
if (size > 0)
fs.Write(data, 0, size);
else
break;
}
}
if (fullPath != fileName)
{
//defect 1969 fix
//if the fullPath has been manipulated above, the path may not yet exist
dirName = Path.GetDirectoryName(fullPath);
if (!Directory.Exists(dirName))
Directory.CreateDirectory(dirName);
//If a file with the same name exists in the target path then we need to delete it before
//we move otherwise .NET will throw an exception
if (File.Exists(fullPath))
File.Delete(fullPath);
File.Move(fileName, fullPath);
}
listFiles.Add(fullPath);
}
listFilesUnzipped = listFiles.ToArray();
ok = true;
}
catch (PathTooLongException)
{
errorMsg = string.Format("Can not unzip the given zip file {0}.\r\n" +
"A path in the zip file combined with the extraction folder would result in a path that exceeds" +
"the Operating System limitation of 248 charaters for a folder path, or 260 characters for a file path.\r\n" +
"Extraction Folder: {1}.", zipFileName, rootDirectoryName);
try
{
foreach (string file in listFiles)
{
File.Delete(file);
}
}
catch { }
ok = false;
}
catch(Exception)
{
ok = false;
}
}
return ok;
}
