# SharpCompress Usage

## Stream Rules

When dealing with Streams, the rule should be that you don't close a stream you didn't create. This, in effect, should mean you should always put a Stream in a using block to dispose it.

However, the .NET Framework often has classes that will dispose streams by default to make things "easy" like the following:

```C#
using (var reader = new StreamReader(File.Open("foo")))
{
    ...
}
```

In this example, reader should get disposed. However, stream rules should say the the `FileStream` created by `File.Open` should remain open. However, the .NET Framework closes it for you by default unless you override the constructor. In general, you should be writing Stream code like this:

```C#
using (var fileStream = File.Open("foo"))
using (var reader = new StreamReader(fileStream))
{
    ...
}
```

To deal with the "correct" rules as well as the expectations of users, I've decided on this:

* When writing, leave streams open.
* When reading, close streams

To be explicit though, consider always using the overloads that use `ReaderOptions` or `WriterOptions` and explicitly set `LeaveStreamOpen` the way you want.

## Samples

Also, look over the tests for more thorough [examples](https://github.com/adamhathcock/sharpcompress/tree/master/tests/SharpCompress.Test)

### Create Zip Archive from all files in a directory to a file

```C#
using (var archive = ZipArchive.Create())
{
    archive.AddAllFromDirectory("D:\\temp");
    archive.SaveTo("C:\\temp.zip", CompressionType.Deflate);
}
```

### Create Zip Archive from all files in a directory and save in memory

```C#
var memoryStream = new MemoryStream();
using (var archive = ZipArchive.Create())
{
    archive.AddAllFromDirectory("D:\\temp");
    archive.SaveTo(memoryStream, new WriterOptions(CompressionType.Deflate)
                                {
                                    LeaveStreamOpen = true
                                });
}
//reset memoryStream to be usable now
memoryStream.Position = 0;
```

### Extract all files from a Rar file to a directory using RarArchive

```C#
using (var archive = RarArchive.Open("Test.rar"))
{
    foreach (var entry in archive.Entries.Where(entry => !entry.IsDirectory))
    {
        entry.WriteToDirectory("D:\\temp", new ExtractionOptions()
        {
            ExtractFullPath = true,
            Overwrite = true
        });
    }
}
```

### Use ReaderFactory to autodetect archive type and Open the entry stream

```C#
using (Stream stream = File.OpenRead("Tar.tar.bz2"))
using (var reader = ReaderFactory.Open(stream))
{
    while (reader.MoveToNextEntry())
    {
        if (!reader.Entry.IsDirectory)
        {
            Console.WriteLine(reader.Entry.Key);
            reader.WriteEntryToDirectory(@"C:\temp", new ExtractionOptions()
            {
                ExtractFullPath = true,
                Overwrite = true
            });
        }
    }
}
```

### Use ReaderFactory to autodetect archive type and Open the entry stream

```C#
using (Stream stream = File.OpenRead("Tar.tar.bz2"))
using (var reader = ReaderFactory.Open(stream))
{
    while (reader.MoveToNextEntry())
    {
        if (!reader.Entry.IsDirectory)
        {
            using (var entryStream = reader.OpenEntryStream())
            {
                entryStream.CopyTo(...);
            }
        }
    }
}
```

### Use WriterFactory to write all files from a directory in a streaming manner.

```C#
using (Stream stream = File.OpenWrite("C:\\temp.tgz"))
using (var writer = WriterFactory.Open(stream, ArchiveType.Tar, new WriterOptions(CompressionType.GZip)
                                                {
                                                    LeaveOpenStream = true
                                                }))
{
    writer.WriteAll("D:\\temp", "*", SearchOption.AllDirectories);
}
```