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284
常用工具集/Utility/ICSharpCode.SharpZipLib/Core/StreamUtils.cs
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284
常用工具集/Utility/ICSharpCode.SharpZipLib/Core/StreamUtils.cs
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using System;
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using System.IO;
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namespace ICSharpCode.SharpZipLib.Core
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{
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/// <summary>
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/// Provides simple <see cref="Stream"/>" utilities.
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/// </summary>
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public sealed class StreamUtils
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{
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/// <summary>
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/// Read from a <see cref="Stream"/> ensuring all the required data is read.
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/// </summary>
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/// <param name="stream">The stream to read.</param>
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/// <param name="buffer">The buffer to fill.</param>
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/// <seealso cref="ReadFully(Stream,byte[],int,int)"/>
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static public void ReadFully(Stream stream, byte[] buffer)
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{
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ReadFully(stream, buffer, 0, buffer.Length);
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}
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/// <summary>
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/// Read from a <see cref="Stream"/>" ensuring all the required data is read.
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/// </summary>
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/// <param name="stream">The stream to read data from.</param>
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/// <param name="buffer">The buffer to store data in.</param>
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/// <param name="offset">The offset at which to begin storing data.</param>
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/// <param name="count">The number of bytes of data to store.</param>
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/// <exception cref="ArgumentNullException">Required parameter is null</exception>
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/// <exception cref="ArgumentOutOfRangeException"><paramref name="offset"/> and or <paramref name="count"/> are invalid.</exception>
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/// <exception cref="EndOfStreamException">End of stream is encountered before all the data has been read.</exception>
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static public void ReadFully(Stream stream, byte[] buffer, int offset, int count)
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{
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if (stream == null)
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{
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throw new ArgumentNullException(nameof(stream));
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}
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if (buffer == null)
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{
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throw new ArgumentNullException(nameof(buffer));
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}
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// Offset can equal length when buffer and count are 0.
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if ((offset < 0) || (offset > buffer.Length))
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{
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throw new ArgumentOutOfRangeException(nameof(offset));
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}
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if ((count < 0) || (offset + count > buffer.Length))
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{
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throw new ArgumentOutOfRangeException(nameof(count));
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}
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while (count > 0)
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{
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int readCount = stream.Read(buffer, offset, count);
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if (readCount <= 0)
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{
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throw new EndOfStreamException();
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}
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offset += readCount;
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count -= readCount;
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}
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}
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/// <summary>
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/// Read as much data as possible from a <see cref="Stream"/>", up to the requested number of bytes
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/// </summary>
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/// <param name="stream">The stream to read data from.</param>
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/// <param name="buffer">The buffer to store data in.</param>
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/// <param name="offset">The offset at which to begin storing data.</param>
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/// <param name="count">The number of bytes of data to store.</param>
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/// <exception cref="ArgumentNullException">Required parameter is null</exception>
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/// <exception cref="ArgumentOutOfRangeException"><paramref name="offset"/> and or <paramref name="count"/> are invalid.</exception>
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static public int ReadRequestedBytes(Stream stream, byte[] buffer, int offset, int count)
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{
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if (stream == null)
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{
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throw new ArgumentNullException(nameof(stream));
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}
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if (buffer == null)
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{
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throw new ArgumentNullException(nameof(buffer));
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}
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// Offset can equal length when buffer and count are 0.
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if ((offset < 0) || (offset > buffer.Length))
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{
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throw new ArgumentOutOfRangeException(nameof(offset));
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}
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if ((count < 0) || (offset + count > buffer.Length))
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{
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throw new ArgumentOutOfRangeException(nameof(count));
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}
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int totalReadCount = 0;
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while (count > 0)
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{
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int readCount = stream.Read(buffer, offset, count);
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if (readCount <= 0)
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{
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break;
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}
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offset += readCount;
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count -= readCount;
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totalReadCount += readCount;
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}
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return totalReadCount;
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}
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/// <summary>
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/// Copy the contents of one <see cref="Stream"/> to another.
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/// </summary>
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/// <param name="source">The stream to source data from.</param>
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/// <param name="destination">The stream to write data to.</param>
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/// <param name="buffer">The buffer to use during copying.</param>
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static public void Copy(Stream source, Stream destination, byte[] buffer)
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{
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if (source == null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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if (destination == null)
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{
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throw new ArgumentNullException(nameof(destination));
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}
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if (buffer == null)
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{
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throw new ArgumentNullException(nameof(buffer));
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}
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// Ensure a reasonable size of buffer is used without being prohibitive.
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if (buffer.Length < 128)
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{
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throw new ArgumentException("Buffer is too small", nameof(buffer));
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}
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bool copying = true;
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while (copying)
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{
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int bytesRead = source.Read(buffer, 0, buffer.Length);
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if (bytesRead > 0)
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{
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destination.Write(buffer, 0, bytesRead);
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}
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else
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{
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destination.Flush();
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copying = false;
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}
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}
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}
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/// <summary>
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/// Copy the contents of one <see cref="Stream"/> to another.
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/// </summary>
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/// <param name="source">The stream to source data from.</param>
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/// <param name="destination">The stream to write data to.</param>
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/// <param name="buffer">The buffer to use during copying.</param>
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/// <param name="progressHandler">The <see cref="ProgressHandler">progress handler delegate</see> to use.</param>
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/// <param name="updateInterval">The minimum <see cref="TimeSpan"/> between progress updates.</param>
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/// <param name="sender">The source for this event.</param>
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/// <param name="name">The name to use with the event.</param>
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/// <remarks>This form is specialised for use within #Zip to support events during archive operations.</remarks>
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static public void Copy(Stream source, Stream destination,
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byte[] buffer, ProgressHandler progressHandler, TimeSpan updateInterval, object sender, string name)
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{
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Copy(source, destination, buffer, progressHandler, updateInterval, sender, name, -1);
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}
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/// <summary>
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/// Copy the contents of one <see cref="Stream"/> to another.
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/// </summary>
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/// <param name="source">The stream to source data from.</param>
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/// <param name="destination">The stream to write data to.</param>
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/// <param name="buffer">The buffer to use during copying.</param>
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/// <param name="progressHandler">The <see cref="ProgressHandler">progress handler delegate</see> to use.</param>
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/// <param name="updateInterval">The minimum <see cref="TimeSpan"/> between progress updates.</param>
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/// <param name="sender">The source for this event.</param>
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/// <param name="name">The name to use with the event.</param>
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/// <param name="fixedTarget">A predetermined fixed target value to use with progress updates.
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/// If the value is negative the target is calculated by looking at the stream.</param>
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/// <remarks>This form is specialised for use within #Zip to support events during archive operations.</remarks>
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static public void Copy(Stream source, Stream destination,
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byte[] buffer,
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ProgressHandler progressHandler, TimeSpan updateInterval,
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object sender, string name, long fixedTarget)
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{
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if (source == null)
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{
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throw new ArgumentNullException(nameof(source));
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}
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if (destination == null)
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{
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throw new ArgumentNullException(nameof(destination));
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}
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if (buffer == null)
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{
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throw new ArgumentNullException(nameof(buffer));
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}
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// Ensure a reasonable size of buffer is used without being prohibitive.
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if (buffer.Length < 128)
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{
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throw new ArgumentException("Buffer is too small", nameof(buffer));
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}
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if (progressHandler == null)
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{
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throw new ArgumentNullException(nameof(progressHandler));
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}
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bool copying = true;
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DateTime marker = DateTime.Now;
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long processed = 0;
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long target = 0;
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if (fixedTarget >= 0)
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{
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target = fixedTarget;
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}
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else if (source.CanSeek)
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{
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target = source.Length - source.Position;
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}
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// Always fire 0% progress..
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var args = new ProgressEventArgs(name, processed, target);
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progressHandler(sender, args);
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bool progressFired = true;
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while (copying)
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{
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int bytesRead = source.Read(buffer, 0, buffer.Length);
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if (bytesRead > 0)
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{
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processed += bytesRead;
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progressFired = false;
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destination.Write(buffer, 0, bytesRead);
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}
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else
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{
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destination.Flush();
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copying = false;
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}
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if (DateTime.Now - marker > updateInterval)
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{
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progressFired = true;
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marker = DateTime.Now;
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args = new ProgressEventArgs(name, processed, target);
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progressHandler(sender, args);
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copying = args.ContinueRunning;
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}
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}
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if (!progressFired)
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{
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args = new ProgressEventArgs(name, processed, target);
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progressHandler(sender, args);
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}
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}
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/// <summary>
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/// Initialise an instance of <see cref="StreamUtils"></see>
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/// </summary>
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private StreamUtils()
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{
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// Do nothing.
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}
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}
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}
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