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StreamUtils.cs
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StreamUtils.cs
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using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace ICSharpCode.SharpZipLib.Core
{
/// <summary>
/// Provides simple <see cref="Stream"/>" utilities.
/// </summary>
public static class StreamUtils
{
/// <summary>
/// Read from a <see cref="Stream"/> ensuring all the required data is read.
/// </summary>
/// <param name="stream">The stream to read.</param>
/// <param name="buffer">The buffer to fill.</param>
/// <seealso cref="ReadFully(Stream,byte[],int,int)"/>
public static void ReadFully(Stream stream, byte[] buffer)
{
ReadFully(stream, buffer, 0, buffer.Length);
}
/// <summary>
/// Read from a <see cref="Stream"/>" ensuring all the required data is read.
/// </summary>
/// <param name="stream">The stream to read data from.</param>
/// <param name="buffer">The buffer to store data in.</param>
/// <param name="offset">The offset at which to begin storing data.</param>
/// <param name="count">The number of bytes of data to store.</param>
/// <exception cref="ArgumentNullException">Required parameter is null</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="offset"/> and or <paramref name="count"/> are invalid.</exception>
/// <exception cref="EndOfStreamException">End of stream is encountered before all the data has been read.</exception>
public static void ReadFully(Stream stream, byte[] buffer, int offset, int count)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
// Offset can equal length when buffer and count are 0.
if ((offset < 0) || (offset > buffer.Length))
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((count < 0) || (offset + count > buffer.Length))
{
throw new ArgumentOutOfRangeException(nameof(count));
}
while (count > 0)
{
int readCount = stream.Read(buffer, offset, count);
if (readCount <= 0)
{
throw new EndOfStreamException();
}
offset += readCount;
count -= readCount;
}
}
/// <summary>
/// Read as much data as possible from a <see cref="Stream"/>", up to the requested number of bytes
/// </summary>
/// <param name="stream">The stream to read data from.</param>
/// <param name="buffer">The buffer to store data in.</param>
/// <param name="offset">The offset at which to begin storing data.</param>
/// <param name="count">The number of bytes of data to store.</param>
/// <exception cref="ArgumentNullException">Required parameter is null</exception>
/// <exception cref="ArgumentOutOfRangeException"><paramref name="offset"/> and or <paramref name="count"/> are invalid.</exception>
public static int ReadRequestedBytes(Stream stream, byte[] buffer, int offset, int count)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
// Offset can equal length when buffer and count are 0.
if ((offset < 0) || (offset > buffer.Length))
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
if ((count < 0) || (offset + count > buffer.Length))
{
throw new ArgumentOutOfRangeException(nameof(count));
}
int totalReadCount = 0;
while (count > 0)
{
int readCount = stream.Read(buffer, offset, count);
if (readCount <= 0)
{
break;
}
offset += readCount;
count -= readCount;
totalReadCount += readCount;
}
return totalReadCount;
}
/// <summary>
/// Copy the contents of one <see cref="Stream"/> to another.
/// </summary>
/// <param name="source">The stream to source data from.</param>
/// <param name="destination">The stream to write data to.</param>
/// <param name="buffer">The buffer to use during copying.</param>
public static void Copy(Stream source, Stream destination, byte[] buffer)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
// Ensure a reasonable size of buffer is used without being prohibitive.
if (buffer.Length < 128)
{
throw new ArgumentException("Buffer is too small", nameof(buffer));
}
bool copying = true;
while (copying)
{
int bytesRead = source.Read(buffer, 0, buffer.Length);
if (bytesRead > 0)
{
destination.Write(buffer, 0, bytesRead);
}
else
{
destination.Flush();
copying = false;
}
}
}
/// <summary>
/// Copy the contents of one <see cref="Stream"/> to another.
/// </summary>
/// <param name="source">The stream to source data from.</param>
/// <param name="destination">The stream to write data to.</param>
/// <param name="buffer">The buffer to use during copying.</param>
/// <param name="progressHandler">The <see cref="ProgressHandler">progress handler delegate</see> to use.</param>
/// <param name="updateInterval">The minimum <see cref="TimeSpan"/> between progress updates.</param>
/// <param name="sender">The source for this event.</param>
/// <param name="name">The name to use with the event.</param>
/// <remarks>This form is specialised for use within #Zip to support events during archive operations.</remarks>
public static void Copy(Stream source, Stream destination,
byte[] buffer, ProgressHandler progressHandler, TimeSpan updateInterval, object sender, string name)
{
Copy(source, destination, buffer, progressHandler, updateInterval, sender, name, -1);
}
/// <summary>
/// Copy the contents of one <see cref="Stream"/> to another.
/// </summary>
/// <param name="source">The stream to source data from.</param>
/// <param name="destination">The stream to write data to.</param>
/// <param name="buffer">The buffer to use during copying.</param>
/// <param name="progressHandler">The <see cref="ProgressHandler">progress handler delegate</see> to use.</param>
/// <param name="updateInterval">The minimum <see cref="TimeSpan"/> between progress updates.</param>
/// <param name="sender">The source for this event.</param>
/// <param name="name">The name to use with the event.</param>
/// <param name="fixedTarget">A predetermined fixed target value to use with progress updates.
/// If the value is negative the target is calculated by looking at the stream.</param>
/// <remarks>This form is specialised for use within #Zip to support events during archive operations.</remarks>
public static void Copy(Stream source, Stream destination,
byte[] buffer,
ProgressHandler progressHandler, TimeSpan updateInterval,
object sender, string name, long fixedTarget)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
if (buffer == null)
{
throw new ArgumentNullException(nameof(buffer));
}
// Ensure a reasonable size of buffer is used without being prohibitive.
if (buffer.Length < 128)
{
throw new ArgumentException("Buffer is too small", nameof(buffer));
}
if (progressHandler == null)
{
throw new ArgumentNullException(nameof(progressHandler));
}
bool copying = true;
DateTime marker = DateTime.Now;
long processed = 0;
long target = 0;
if (fixedTarget >= 0)
{
target = fixedTarget;
}
else if (source.CanSeek)
{
target = source.Length - source.Position;
}
// Always fire 0% progress..
var args = new ProgressEventArgs(name, processed, target);
progressHandler(sender, args);
bool progressFired = true;
while (copying)
{
int bytesRead = source.Read(buffer, 0, buffer.Length);
if (bytesRead > 0)
{
processed += bytesRead;
progressFired = false;
destination.Write(buffer, 0, bytesRead);
}
else
{
destination.Flush();
copying = false;
}
if (DateTime.Now - marker > updateInterval)
{
progressFired = true;
marker = DateTime.Now;
args = new ProgressEventArgs(name, processed, target);
progressHandler(sender, args);
copying = args.ContinueRunning;
}
}
if (!progressFired)
{
args = new ProgressEventArgs(name, processed, target);
progressHandler(sender, args);
}
}
internal static async Task WriteProcToStreamAsync(this Stream targetStream, MemoryStream bufferStream, Action<Stream> writeProc, CancellationToken ct)
{
bufferStream.SetLength(0);
writeProc(bufferStream);
bufferStream.Position = 0;
await bufferStream.CopyToAsync(targetStream, 81920, ct).ConfigureAwait(false);
bufferStream.SetLength(0);
}
internal static async Task WriteProcToStreamAsync(this Stream targetStream, Action<Stream> writeProc, CancellationToken ct)
{
using (var ms = new MemoryStream())
{
await WriteProcToStreamAsync(targetStream, ms, writeProc, ct).ConfigureAwait(false);
}
}
}
}