mirror of https://github.com/SixLabors/ImageSharp
James Jackson-South
6 years ago
9 changed files with 317 additions and 669 deletions
@ -1,466 +1,155 @@ |
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// Copyright (c) Six Labors and contributors.
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// Licensed under the Apache License, Version 2.0.
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// <auto-generated/>
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using System; |
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using System.Collections.Generic; |
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using System.IO; |
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using System.Text; |
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using SixLabors.Memory; |
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namespace SixLabors.ImageSharp.Formats.Png.Zlib |
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{ |
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/// <summary>
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/// A special stream deflating or compressing the bytes that are
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/// written to it. It uses a Deflater to perform actual deflating.<br/>
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/// Authors of the original java version : Tom Tromey, Jochen Hoenicke
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/// written to it. It uses a Deflater to perform actual deflating.
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/// </summary>
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public class DeflaterOutputStream : Stream |
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internal sealed class DeflaterOutputStream : Stream |
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{ |
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#region Constructors
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/// <summary>
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/// Creates a new DeflaterOutputStream with the given Deflater and
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/// default buffer size.
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/// </summary>
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/// <param name="baseOutputStream">
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/// the output stream where deflated output should be written.
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/// </param>
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/// <param name="deflater">
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/// the underlying deflater.
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/// </param>
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public DeflaterOutputStream(Stream baseOutputStream, Deflater deflater) |
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: this(baseOutputStream, deflater, 512) |
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{ |
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} |
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private const int BufferLength = 512; |
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private IManagedByteBuffer memoryOwner; |
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private readonly byte[] buffer; |
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private Deflater deflater; |
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private readonly Stream rawStream; |
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private bool isDisposed; |
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/// <summary>
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/// Creates a new DeflaterOutputStream with the given Deflater and
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/// buffer size.
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/// Initializes a new instance of the <see cref="DeflaterOutputStream"/> class.
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/// </summary>
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/// <param name="baseOutputStream">
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/// The output stream where deflated output is written.
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/// </param>
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/// <param name="deflater">
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/// The underlying deflater to use
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/// </param>
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/// <param name="bufferSize">
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/// The buffer size in bytes to use when deflating (minimum value 512)
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/// </param>
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/// <exception cref="ArgumentOutOfRangeException">
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/// bufsize is less than or equal to zero.
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/// </exception>
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/// <exception cref="ArgumentException">
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/// baseOutputStream does not support writing
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/// </exception>
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/// <exception cref="ArgumentNullException">
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/// deflater instance is null
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/// </exception>
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public DeflaterOutputStream(Stream baseOutputStream, Deflater deflater, int bufferSize) |
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/// <param name="memoryAllocator">The memory allocator to use for buffer allocations.</param>
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/// <param name="rawStream">The output stream where deflated output is written.</param>
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/// <param name="compressionLevel">The compression level.</param>
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public DeflaterOutputStream(MemoryAllocator memoryAllocator, Stream rawStream, int compressionLevel) |
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{ |
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if (baseOutputStream == null) |
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{ |
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throw new ArgumentNullException(nameof(baseOutputStream)); |
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} |
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if (baseOutputStream.CanWrite == false) |
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{ |
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throw new ArgumentException("Must support writing", nameof(baseOutputStream)); |
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} |
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if (bufferSize < 512) |
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{ |
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throw new ArgumentOutOfRangeException(nameof(bufferSize)); |
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} |
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baseOutputStream_ = baseOutputStream; |
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buffer_ = new byte[bufferSize]; |
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deflater_ = deflater ?? throw new ArgumentNullException(nameof(deflater)); |
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this.rawStream = rawStream; |
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this.memoryOwner = memoryAllocator.AllocateManagedByteBuffer(BufferLength); |
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this.buffer = this.memoryOwner.Array; |
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this.deflater = new Deflater(memoryAllocator, compressionLevel); |
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} |
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#endregion Constructors
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/// <inheritdoc/>
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public override bool CanRead => false; |
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#region Public API
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/// <inheritdoc/>
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public override bool CanSeek => false; |
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/// <summary>
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/// Finishes the stream by calling finish() on the deflater.
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/// </summary>
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/// <exception cref="ImageFormatException">
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/// Not all input is deflated
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/// </exception>
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public virtual void Finish() |
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{ |
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deflater_.Finish(); |
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while (!deflater_.IsFinished) |
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{ |
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int len = deflater_.Deflate(buffer_, 0, buffer_.Length); |
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if (len <= 0) |
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{ |
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break; |
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} |
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/// <inheritdoc/>
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public override bool CanWrite => this.rawStream.CanWrite; |
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baseOutputStream_.Write(buffer_, 0, len); |
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} |
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/// <inheritdoc/>
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public override long Length => this.rawStream.Length; |
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if (!deflater_.IsFinished) |
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/// <inheritdoc/>
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public override long Position |
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{ |
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get |
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{ |
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throw new ImageFormatException("Can't deflate all input?"); |
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return this.rawStream.Position; |
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} |
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baseOutputStream_.Flush(); |
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} |
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/// <summary>
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/// Gets or sets a flag indicating ownership of underlying stream.
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/// When the flag is true <see cref="Stream.Dispose()" /> will close the underlying stream also.
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/// </summary>
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/// <remarks>The default value is true.</remarks>
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public bool IsStreamOwner { get; set; } = true; |
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/// <summary>
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/// Allows client to determine if an entry can be patched after its added
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/// </summary>
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public bool CanPatchEntries |
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{ |
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get |
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set |
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{ |
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return baseOutputStream_.CanSeek; |
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throw new NotSupportedException(); |
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} |
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} |
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#endregion Public API
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//#region Encryption
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//private string password;
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//private ICryptoTransform cryptoTransform_;
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/// <inheritdoc/>
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public override long Seek(long offset, SeekOrigin origin) => throw new NotSupportedException(); |
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///// <summary>
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///// Returns the 10 byte AUTH CODE to be appended immediately following the AES data stream.
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///// </summary>
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//protected byte[] AESAuthCode;
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/// <inheritdoc/>
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public override void SetLength(long value) => throw new NotSupportedException(); |
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///// <summary>
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///// Get/set the password used for encryption.
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///// </summary>
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///// <remarks>When set to null or if the password is empty no encryption is performed</remarks>
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//public string Password
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//{
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// get
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// {
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// return password;
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// }
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// set
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// {
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// if ((value != null) && (value.Length == 0))
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// {
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// password = null;
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// }
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// else
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// {
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// password = value;
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// }
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// }
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//}
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/// <inheritdoc/>
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public override int ReadByte() => throw new NotSupportedException(); |
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///// <summary>
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///// Encrypt a block of data
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///// </summary>
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///// <param name="buffer">
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///// Data to encrypt. NOTE the original contents of the buffer are lost
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///// </param>
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///// <param name="offset">
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///// Offset of first byte in buffer to encrypt
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///// </param>
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///// <param name="length">
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///// Number of bytes in buffer to encrypt
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///// </param>
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//protected void EncryptBlock(byte[] buffer, int offset, int length)
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//{
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// cryptoTransform_.TransformBlock(buffer, 0, length, buffer, 0);
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//}
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/// <inheritdoc/>
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public override int Read(byte[] buffer, int offset, int count) => throw new NotSupportedException(); |
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///// <summary>
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///// Initializes encryption keys based on given <paramref name="password"/>.
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///// </summary>
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///// <param name="password">The password.</param>
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//protected void InitializePassword(string password)
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//{
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// var pkManaged = new PkzipClassicManaged();
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// byte[] key = PkzipClassic.GenerateKeys(ZipStrings.ConvertToArray(password));
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// cryptoTransform_ = pkManaged.CreateEncryptor(key, null);
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//}
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///// <summary>
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///// Initializes encryption keys based on given password.
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///// </summary>
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//protected void InitializeAESPassword(ZipEntry entry, string rawPassword,
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// out byte[] salt, out byte[] pwdVerifier)
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//{
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// salt = new byte[entry.AESSaltLen];
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// // Salt needs to be cryptographically random, and unique per file
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// if (_aesRnd == null)
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// _aesRnd = RandomNumberGenerator.Create();
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// _aesRnd.GetBytes(salt);
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// int blockSize = entry.AESKeySize / 8; // bits to bytes
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// cryptoTransform_ = new ZipAESTransform(rawPassword, salt, blockSize, true);
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// pwdVerifier = ((ZipAESTransform)cryptoTransform_).PwdVerifier;
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//}
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//#endregion Encryption
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#region Deflation Support
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/// <inheritdoc/>
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public override void Flush() |
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{ |
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this.deflater.Flush(); |
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this.Deflate(true); |
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this.rawStream.Flush(); |
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} |
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/// <summary>
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/// Deflates everything in the input buffers. This will call
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/// <code>def.deflate()</code> until all bytes from the input buffers
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/// are processed.
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/// </summary>
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protected void Deflate() |
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/// <inheritdoc/>
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public override void Write(byte[] buffer, int offset, int count) |
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{ |
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Deflate(false); |
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this.deflater.SetInput(buffer, offset, count); |
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this.Deflate(); |
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} |
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private void Deflate() => this.Deflate(false); |
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private void Deflate(bool flushing) |
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{ |
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while (flushing || !deflater_.IsNeedingInput) |
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while (flushing || !this.deflater.IsNeedingInput) |
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{ |
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int deflateCount = deflater_.Deflate(buffer_, 0, buffer_.Length); |
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int deflateCount = this.deflater.Deflate(this.buffer, 0, BufferLength); |
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if (deflateCount <= 0) |
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{ |
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break; |
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} |
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//if (cryptoTransform_ != null)
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//{
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// EncryptBlock(buffer_, 0, deflateCount);
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//}
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baseOutputStream_.Write(buffer_, 0, deflateCount); |
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this.rawStream.Write(this.buffer, 0, deflateCount); |
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} |
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if (!deflater_.IsNeedingInput) |
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if (!this.deflater.IsNeedingInput) |
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{ |
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throw new ImageFormatException("DeflaterOutputStream can't deflate all input?"); |
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DeflateThrowHelper.ThrowNoDeflate(); |
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} |
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} |
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#endregion Deflation Support
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#region Stream Overrides
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/// <summary>
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/// Gets value indicating stream can be read from
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/// </summary>
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public override bool CanRead |
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private void Finish() |
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{ |
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get |
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this.deflater.Finish(); |
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while (!this.deflater.IsFinished) |
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{ |
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return false; |
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} |
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} |
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int len = this.deflater.Deflate(this.buffer, 0, BufferLength); |
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if (len <= 0) |
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{ |
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break; |
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} |
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/// <summary>
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/// Gets a value indicating if seeking is supported for this stream
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/// This property always returns false
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/// </summary>
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public override bool CanSeek |
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{ |
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get |
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{ |
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return false; |
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this.rawStream.Write(this.buffer, 0, len); |
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} |
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} |
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/// <summary>
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/// Get value indicating if this stream supports writing
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/// </summary>
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public override bool CanWrite |
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{ |
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get |
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if (!this.deflater.IsFinished) |
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{ |
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return baseOutputStream_.CanWrite; |
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DeflateThrowHelper.ThrowNoDeflate(); |
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} |
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} |
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/// <summary>
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/// Get current length of stream
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/// </summary>
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public override long Length |
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{ |
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get |
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{ |
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return baseOutputStream_.Length; |
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} |
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this.rawStream.Flush(); |
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} |
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/// <summary>
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/// Gets the current position within the stream.
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/// </summary>
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/// <exception cref="NotSupportedException">Any attempt to set position</exception>
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public override long Position |
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/// <inheritdoc/>
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protected override void Dispose(bool disposing) |
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{ |
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get |
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{ |
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return baseOutputStream_.Position; |
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} |
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set |
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if (this.isDisposed) |
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{ |
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throw new NotSupportedException("Position property not supported"); |
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return; |
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} |
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} |
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/// <summary>
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/// Sets the current position of this stream to the given value. Not supported by this class!
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/// </summary>
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/// <param name="offset">The offset relative to the <paramref name="origin"/> to seek.</param>
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/// <param name="origin">The <see cref="SeekOrigin"/> to seek from.</param>
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/// <returns>The new position in the stream.</returns>
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/// <exception cref="NotSupportedException">Any access</exception>
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public override long Seek(long offset, SeekOrigin origin) |
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{ |
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throw new NotSupportedException("DeflaterOutputStream Seek not supported"); |
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} |
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/// <summary>
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/// Sets the length of this stream to the given value. Not supported by this class!
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/// </summary>
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/// <param name="value">The new stream length.</param>
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/// <exception cref="NotSupportedException">Any access</exception>
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public override void SetLength(long value) |
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{ |
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throw new NotSupportedException("DeflaterOutputStream SetLength not supported"); |
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} |
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/// <summary>
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/// Read a byte from stream advancing position by one
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/// </summary>
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/// <returns>The byte read cast to an int. THe value is -1 if at the end of the stream.</returns>
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/// <exception cref="NotSupportedException">Any access</exception>
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public override int ReadByte() |
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{ |
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throw new NotSupportedException("DeflaterOutputStream ReadByte not supported"); |
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} |
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/// <summary>
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/// Read a block of bytes from stream
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/// </summary>
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/// <param name="buffer">The buffer to store read data in.</param>
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/// <param name="offset">The offset to start storing at.</param>
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/// <param name="count">The maximum number of bytes to read.</param>
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/// <returns>The actual number of bytes read. Zero if end of stream is detected.</returns>
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/// <exception cref="NotSupportedException">Any access</exception>
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public override int Read(byte[] buffer, int offset, int count) |
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{ |
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throw new NotSupportedException("DeflaterOutputStream Read not supported"); |
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} |
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/// <summary>
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/// Flushes the stream by calling <see cref="DeflaterOutputStream.Flush">Flush</see> on the deflater and then
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/// on the underlying stream. This ensures that all bytes are flushed.
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/// </summary>
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public override void Flush() |
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{ |
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deflater_.Flush(); |
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Deflate(true); |
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baseOutputStream_.Flush(); |
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} |
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/// <summary>
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/// Calls <see cref="Finish"/> and closes the underlying
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/// stream when <see cref="IsStreamOwner"></see> is true.
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/// </summary>
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protected override void Dispose(bool disposing) |
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{ |
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if (!isClosed_) |
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if (disposing) |
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{ |
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isClosed_ = true; |
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try |
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{ |
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Finish(); |
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} |
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finally |
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{ |
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if (IsStreamOwner) |
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{ |
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baseOutputStream_.Dispose(); |
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} |
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} |
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this.Finish(); |
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this.deflater.Dispose(); |
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this.memoryOwner.Dispose(); |
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} |
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} |
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///// <summary>
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///// Get the Auth code for AES encrypted entries
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///// </summary>
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//protected void GetAuthCodeIfAES()
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//{
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// if (cryptoTransform_ is ZipAESTransform)
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// {
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// AESAuthCode = ((ZipAESTransform)cryptoTransform_).GetAuthCode();
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// }
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//}
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/// <summary>
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/// Writes a single byte to the compressed output stream.
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/// </summary>
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/// <param name="value">
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/// The byte value.
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/// </param>
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public override void WriteByte(byte value) |
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{ |
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byte[] b = new byte[1]; |
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b[0] = value; |
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Write(b, 0, 1); |
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} |
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/// <summary>
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/// Writes bytes from an array to the compressed stream.
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/// </summary>
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/// <param name="buffer">
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/// The byte array
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/// </param>
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/// <param name="offset">
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/// The offset into the byte array where to start.
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/// </param>
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/// <param name="count">
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/// The number of bytes to write.
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/// </param>
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public override void Write(byte[] buffer, int offset, int count) |
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{ |
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deflater_.SetInput(buffer, offset, count); |
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Deflate(); |
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this.deflater = null; |
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this.memoryOwner = null; |
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this.isDisposed = true; |
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base.Dispose(disposing); |
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} |
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#endregion Stream Overrides
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#region Instance Fields
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/// <summary>
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/// This buffer is used temporarily to retrieve the bytes from the
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/// deflater and write them to the underlying output stream.
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/// </summary>
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private byte[] buffer_; |
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/// <summary>
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/// The deflater which is used to deflate the stream.
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/// </summary>
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protected Deflater deflater_; |
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/// <summary>
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/// Base stream the deflater depends on.
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/// </summary>
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protected Stream baseOutputStream_; |
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private bool isClosed_; |
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#endregion Instance Fields
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#region Static Fields
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// Static to help ensure that multiple files within a zip will get different random salt
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//private static RandomNumberGenerator _aesRnd = RandomNumberGenerator.Create();
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#endregion Static Fields
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} |
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} |
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@ -1,2 +1,5 @@ |
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Adler32.cs and Crc32.cs have been copied from |
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https://github.com/ygrenier/SharpZipLib.Portable |
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Deflatestream implementation adapted from |
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https://github.com/icsharpcode/SharpZipLib |
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LIcensed under MIT |
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|
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