diff options
Diffstat (limited to 'zlib/contrib/dotzlib/DotZLib/GZipStream.cs')
| -rw-r--r-- | zlib/contrib/dotzlib/DotZLib/GZipStream.cs | 301 |
1 files changed, 0 insertions, 301 deletions
diff --git a/zlib/contrib/dotzlib/DotZLib/GZipStream.cs b/zlib/contrib/dotzlib/DotZLib/GZipStream.cs deleted file mode 100644 index b161300..0000000 --- a/zlib/contrib/dotzlib/DotZLib/GZipStream.cs +++ /dev/null @@ -1,301 +0,0 @@ -//
-// © Copyright Henrik Ravn 2004
-//
-// Use, modification and distribution are subject to the Boost Software License, Version 1.0.
-// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-using System;
-using System.IO;
-using System.Runtime.InteropServices;
-
-namespace DotZLib
-{
- /// <summary>
- /// Implements a compressed <see cref="Stream"/>, in GZip (.gz) format.
- /// </summary>
- public class GZipStream : Stream, IDisposable
- {
- #region Dll Imports
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl, CharSet=CharSet.Ansi)]
- private static extern IntPtr gzopen(string name, string mode);
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern int gzclose(IntPtr gzFile);
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern int gzwrite(IntPtr gzFile, int data, int length);
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern int gzread(IntPtr gzFile, int data, int length);
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern int gzgetc(IntPtr gzFile);
-
- [DllImport("ZLIB1.dll", CallingConvention=CallingConvention.Cdecl)]
- private static extern int gzputc(IntPtr gzFile, int c);
-
- #endregion
-
- #region Private data
- private IntPtr _gzFile;
- private bool _isDisposed = false;
- private bool _isWriting;
- #endregion
-
- #region Constructors
- /// <summary>
- /// Creates a new file as a writeable GZipStream
- /// </summary>
- /// <param name="fileName">The name of the compressed file to create</param>
- /// <param name="level">The compression level to use when adding data</param>
- /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
- public GZipStream(string fileName, CompressLevel level)
- {
- _isWriting = true;
- _gzFile = gzopen(fileName, String.Format("wb{0}", (int)level));
- if (_gzFile == IntPtr.Zero)
- throw new ZLibException(-1, "Could not open " + fileName);
- }
-
- /// <summary>
- /// Opens an existing file as a readable GZipStream
- /// </summary>
- /// <param name="fileName">The name of the file to open</param>
- /// <exception cref="ZLibException">If an error occurred in the internal zlib function</exception>
- public GZipStream(string fileName)
- {
- _isWriting = false;
- _gzFile = gzopen(fileName, "rb");
- if (_gzFile == IntPtr.Zero)
- throw new ZLibException(-1, "Could not open " + fileName);
-
- }
- #endregion
-
- #region Access properties
- /// <summary>
- /// Returns true of this stream can be read from, false otherwise
- /// </summary>
- public override bool CanRead
- {
- get
- {
- return !_isWriting;
- }
- }
-
-
- /// <summary>
- /// Returns false.
- /// </summary>
- public override bool CanSeek
- {
- get
- {
- return false;
- }
- }
-
- /// <summary>
- /// Returns true if this tsream is writeable, false otherwise
- /// </summary>
- public override bool CanWrite
- {
- get
- {
- return _isWriting;
- }
- }
- #endregion
-
- #region Destructor & IDispose stuff
-
- /// <summary>
- /// Destroys this instance
- /// </summary>
- ~GZipStream()
- {
- cleanUp(false);
- }
-
- /// <summary>
- /// Closes the external file handle
- /// </summary>
- public void Dispose()
- {
- cleanUp(true);
- }
-
- // Does the actual closing of the file handle.
- private void cleanUp(bool isDisposing)
- {
- if (!_isDisposed)
- {
- gzclose(_gzFile);
- _isDisposed = true;
- }
- }
- #endregion
-
- #region Basic reading and writing
- /// <summary>
- /// Attempts to read a number of bytes from the stream.
- /// </summary>
- /// <param name="buffer">The destination data buffer</param>
- /// <param name="offset">The index of the first destination byte in <c>buffer</c></param>
- /// <param name="count">The number of bytes requested</param>
- /// <returns>The number of bytes read</returns>
- /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
- /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
- /// <exception cref="ArgumentException">If <c>offset</c> + <c>count</c> is > buffer.Length</exception>
- /// <exception cref="NotSupportedException">If this stream is not readable.</exception>
- /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
- public override int Read(byte[] buffer, int offset, int count)
- {
- if (!CanRead) throw new NotSupportedException();
- if (buffer == null) throw new ArgumentNullException();
- if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
- if ((offset+count) > buffer.Length) throw new ArgumentException();
- if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
- GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
- int result;
- try
- {
- result = gzread(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
- if (result < 0)
- throw new IOException();
- }
- finally
- {
- h.Free();
- }
- return result;
- }
-
- /// <summary>
- /// Attempts to read a single byte from the stream.
- /// </summary>
- /// <returns>The byte that was read, or -1 in case of error or End-Of-File</returns>
- public override int ReadByte()
- {
- if (!CanRead) throw new NotSupportedException();
- if (_isDisposed) throw new ObjectDisposedException("GZipStream");
- return gzgetc(_gzFile);
- }
-
- /// <summary>
- /// Writes a number of bytes to the stream
- /// </summary>
- /// <param name="buffer"></param>
- /// <param name="offset"></param>
- /// <param name="count"></param>
- /// <exception cref="ArgumentNullException">If <c>buffer</c> is null</exception>
- /// <exception cref="ArgumentOutOfRangeException">If <c>count</c> or <c>offset</c> are negative</exception>
- /// <exception cref="ArgumentException">If <c>offset</c> + <c>count</c> is > buffer.Length</exception>
- /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
- /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
- public override void Write(byte[] buffer, int offset, int count)
- {
- if (!CanWrite) throw new NotSupportedException();
- if (buffer == null) throw new ArgumentNullException();
- if (offset < 0 || count < 0) throw new ArgumentOutOfRangeException();
- if ((offset+count) > buffer.Length) throw new ArgumentException();
- if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
- GCHandle h = GCHandle.Alloc(buffer, GCHandleType.Pinned);
- try
- {
- int result = gzwrite(_gzFile, h.AddrOfPinnedObject().ToInt32() + offset, count);
- if (result < 0)
- throw new IOException();
- }
- finally
- {
- h.Free();
- }
- }
-
- /// <summary>
- /// Writes a single byte to the stream
- /// </summary>
- /// <param name="value">The byte to add to the stream.</param>
- /// <exception cref="NotSupportedException">If this stream is not writeable.</exception>
- /// <exception cref="ObjectDisposedException">If this stream has been disposed.</exception>
- public override void WriteByte(byte value)
- {
- if (!CanWrite) throw new NotSupportedException();
- if (_isDisposed) throw new ObjectDisposedException("GZipStream");
-
- int result = gzputc(_gzFile, (int)value);
- if (result < 0)
- throw new IOException();
- }
- #endregion
-
- #region Position & length stuff
- /// <summary>
- /// Not supported.
- /// </summary>
- /// <param name="value"></param>
- /// <exception cref="NotSupportedException">Always thrown</exception>
- public override void SetLength(long value)
- {
- throw new NotSupportedException();
- }
-
- /// <summary>
- /// Not suppported.
- /// </summary>
- /// <param name="offset"></param>
- /// <param name="origin"></param>
- /// <returns></returns>
- /// <exception cref="NotSupportedException">Always thrown</exception>
- public override long Seek(long offset, SeekOrigin origin)
- {
- throw new NotSupportedException();
- }
-
- /// <summary>
- /// Flushes the <c>GZipStream</c>.
- /// </summary>
- /// <remarks>In this implementation, this method does nothing. This is because excessive
- /// flushing may degrade the achievable compression rates.</remarks>
- public override void Flush()
- {
- // left empty on purpose
- }
-
- /// <summary>
- /// Gets/sets the current position in the <c>GZipStream</c>. Not suppported.
- /// </summary>
- /// <remarks>In this implementation this property is not supported</remarks>
- /// <exception cref="NotSupportedException">Always thrown</exception>
- public override long Position
- {
- get
- {
- throw new NotSupportedException();
- }
- set
- {
- throw new NotSupportedException();
- }
- }
-
- /// <summary>
- /// Gets the size of the stream. Not suppported.
- /// </summary>
- /// <remarks>In this implementation this property is not supported</remarks>
- /// <exception cref="NotSupportedException">Always thrown</exception>
- public override long Length
- {
- get
- {
- throw new NotSupportedException();
- }
- }
- #endregion
- }
-}
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