/// <summary>
/// Compress a string into a byte array using ZLIB.
/// </summary>
///
/// <remarks>
/// Uncompress it with <see cref="ZStream.UncompressString(byte[])"/>.
/// </remarks>
///
/// <seealso cref="ZStream.UncompressString(byte[])"/>
/// <seealso cref="ZStream.CompressBuffer(byte[])"/>
///
/// <param name="s">
/// A string to compress. The string will first be encoded
/// using UTF8, then compressed.
/// </param>
///
/// <returns>The string in compressed form</returns>
public static byte[] CompressString(String s)
{
using (var ms = new MemoryStream())
{
Stream compressor =
new ZStream(ms, CompressionMode.Compress, CompressionLevel.BestCompression);
ZBaseStream.CompressString(s, compressor);
return(ms.ToArray());
}
}
/// <summary>
/// Uncompress a ZLIB-compressed byte array into a byte array.
/// </summary>
///
/// <seealso cref="ZStream.CompressBuffer(byte[])"/>
/// <seealso cref="ZStream.UncompressString(byte[])"/>
///
/// <param name="compressed">
/// A buffer containing ZLIB-compressed data.
/// </param>
///
/// <returns>The data in uncompressed form</returns>
public static byte[] UncompressBuffer(byte[] compressed)
{
using (var input = new MemoryStream(compressed))
{
Stream decompressor =
new ZStream(input, CompressionMode.Decompress);
return(ZBaseStream.UncompressBuffer(compressed, decompressor));
}
}
/// <summary>
/// Create a <c>ZlibStream</c> using the specified <c>CompressionMode</c> and
/// the specified <c>CompressionLevel</c>, and explicitly specify whether the
/// stream should be left open after Deflation or Inflation.
/// </summary>
///
/// <remarks>
///
/// <para>
/// This constructor allows the application to request that the captive stream
/// remain open after the deflation or inflation occurs. By default, after
/// <c>Close()</c> is called on the stream, the captive stream is also closed. In
/// some cases this is not desired, for example if the stream is a <see
/// cref="System.IO.MemoryStream"/> that will be re-read after compression.
/// Specify true for the <paramref name="leaveOpen"/> parameter to leave the stream open.
/// </para>
///
/// <para>
/// When mode is <c>CompressionMode.Decompress</c>, the level parameter is ignored.
/// </para>
///
/// </remarks>
///
/// <example>
/// This example shows how to use a ZlibStream to compress the data from a file,
/// and store the result into another file. The filestream remains open to allow
/// additional data to be written to it.
/// <code>
/// using (var output = System.IO.File.Create(fileToCompress + ".zlib"))
/// {
/// using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress))
/// {
/// using (Stream compressor = new ZlibStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, true))
/// {
/// byte[] buffer = new byte[WORKING_BUFFER_SIZE];
/// int n;
/// while ((n= input.Read(buffer, 0, buffer.Length)) != 0)
/// {
/// compressor.Write(buffer, 0, n);
/// }
/// }
/// }
/// // can write additional data to the output stream here
/// }
/// </code>
/// <code lang="VB">
/// Using output As FileStream = File.Create(fileToCompress & ".zlib")
/// Using input As Stream = File.OpenRead(fileToCompress)
/// Using compressor As Stream = New ZlibStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, True)
/// Dim buffer As Byte() = New Byte(4096) {}
/// Dim n As Integer = -1
/// Do While (n <> 0)
/// If (n > 0) Then
/// compressor.Write(buffer, 0, n)
/// End If
/// n = input.Read(buffer, 0, buffer.Length)
/// Loop
/// End Using
/// End Using
/// ' can write additional data to the output stream here.
/// End Using
/// </code>
/// </example>
///
/// <param name="stream">The stream which will be read or written.</param>
///
/// <param name="mode">Indicates whether the ZlibStream will compress or decompress.</param>
///
/// <param name="leaveOpen">
/// true if the application would like the stream to remain open after inflation/deflation.
/// </param>
///
/// <param name="level">
/// A tuning knob to trade speed for effectiveness. This parameter is effective only when
/// mode is <c>CompressionMode.Compress</c>.
/// </param>
public ZStream(System.IO.Stream stream, CompressionMode mode, CompressionLevel level, bool leaveOpen)
{
_baseStream = new ZBaseStream(stream, mode, level, ZStreamFlavor.ZLIB, leaveOpen);
}