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Fix Seek Operations in SftpFileStream (#910)
* Fix offset operations in SftpFileStream.Seek * Fix seek exception message and add default case for invalid seek origin * Use named params when throwing ArgumentException * Add tests for seeking from end of file
1 parent b9bc475 commit f3ebc29

4 files changed

+331
-40
lines changed

‎src/Renci.SshNet.Tests/Classes/Sftp/SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetNegative.cs‎

Lines changed: 103 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,103 @@
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using System;
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using System.IO;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using Moq;
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using Renci.SshNet.Sftp;
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namespace Renci.SshNet.Tests.Classes.Sftp
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{
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[TestClass]
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public class SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetNegative : SftpFileStreamTestBase
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{
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private Random _random;
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private string _path;
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private FileMode _fileMode;
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private FileAccess _fileAccess;
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private int _bufferSize;
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private uint _readBufferSize;
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private uint _writeBufferSize;
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private int _length;
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private byte[] _handle;
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private SftpFileStream _target;
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private int _offset;
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private SftpFileAttributes _attributes;
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private long _actual;
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protected override void SetupData()
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{
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base.SetupData();
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_random = new Random();
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_path = _random.Next().ToString();
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_fileMode = FileMode.OpenOrCreate;
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_fileAccess = FileAccess.Write;
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_bufferSize = _random.Next(5, 1000);
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_readBufferSize = (uint)_random.Next(5, 1000);
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_writeBufferSize = (uint)_random.Next(5, 1000);
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_length = _random.Next(5, 10000);
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_handle = GenerateRandom(_random.Next(1, 10), _random);
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_offset = _random.Next(-_length, -1);
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_attributes = SftpFileAttributes.Empty;
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}
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protected override void SetupMocks()
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{
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.RequestOpen(_path, Flags.Write | Flags.CreateNewOrOpen, false))
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.Returns(_handle);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.CalculateOptimalReadLength((uint)_bufferSize))
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.Returns(_readBufferSize);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.CalculateOptimalWriteLength((uint)_bufferSize, _handle))
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.Returns(_writeBufferSize);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.IsOpen)
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.Returns(true);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.RequestFStat(_handle, false))
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.Returns(_attributes);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.RequestFSetStat(_handle, _attributes));
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SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
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SftpSessionMock.InSequence(MockSequence)
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.Setup(session => session.RequestFStat(_handle, false))
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.Returns(_attributes);
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}
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protected override void Arrange()
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{
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base.Arrange();
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_target = new SftpFileStream(SftpSessionMock.Object, _path, _fileMode, _fileAccess, _bufferSize);
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_target.SetLength(_length);
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}
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protected override void Act()
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{
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_actual = _target.Seek(_offset, SeekOrigin.End);
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}
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[TestMethod]
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public void SeekShouldHaveReturnedOffset()
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{
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Assert.AreEqual(_attributes.Size + _offset, _actual);
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}
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[TestMethod]
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public void IsOpenOnSftpSessionShouldHaveBeenInvokedTwice()
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{
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SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(2));
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}
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[TestMethod]
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public void PositionShouldReturnOffset()
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{
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SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
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Assert.AreEqual(_attributes.Size + _offset, _target.Position);
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SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(3));
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}
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}
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}

‎src/Renci.SshNet.Tests/Classes/Sftp/SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetPositive.cs‎

Lines changed: 103 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,103 @@
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using System;
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using System.IO;
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using Microsoft.VisualStudio.TestTools.UnitTesting;
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using Moq;
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using Renci.SshNet.Sftp;
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namespace Renci.SshNet.Tests.Classes.Sftp
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{
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[TestClass]
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public class SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetPositive : SftpFileStreamTestBase
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{
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private Random _random;
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private string _path;
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private FileMode _fileMode;
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private FileAccess _fileAccess;
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private int _bufferSize;
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private uint _readBufferSize;
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private uint _writeBufferSize;
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private int _length;
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private byte[] _handle;
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private SftpFileStream _target;
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private int _offset;
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private SftpFileAttributes _attributes;
24+
private long _actual;
25+
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protected override void SetupData()
27+
{
28+
base.SetupData();
29+
30+
_random = new Random();
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_path = _random.Next().ToString();
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_fileMode = FileMode.OpenOrCreate;
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_fileAccess = FileAccess.Write;
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_bufferSize = _random.Next(5, 1000);
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_readBufferSize = (uint)_random.Next(5, 1000);
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_writeBufferSize = (uint)_random.Next(5, 1000);
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_length = _random.Next(5, 10000);
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_handle = GenerateRandom(_random.Next(1, 10), _random);
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_offset = _random.Next(1, int.MaxValue);
40+
_attributes = SftpFileAttributes.Empty;
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}
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protected override void SetupMocks()
44+
{
45+
SftpSessionMock.InSequence(MockSequence)
46+
.Setup(session => session.RequestOpen(_path, Flags.Write | Flags.CreateNewOrOpen, false))
47+
.Returns(_handle);
48+
SftpSessionMock.InSequence(MockSequence)
49+
.Setup(session => session.CalculateOptimalReadLength((uint)_bufferSize))
50+
.Returns(_readBufferSize);
51+
SftpSessionMock.InSequence(MockSequence)
52+
.Setup(session => session.CalculateOptimalWriteLength((uint)_bufferSize, _handle))
53+
.Returns(_writeBufferSize);
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SftpSessionMock.InSequence(MockSequence)
55+
.Setup(session => session.IsOpen)
56+
.Returns(true);
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SftpSessionMock.InSequence(MockSequence)
58+
.Setup(session => session.RequestFStat(_handle, false))
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.Returns(_attributes);
60+
SftpSessionMock.InSequence(MockSequence)
61+
.Setup(session => session.RequestFSetStat(_handle, _attributes));
62+
SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
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SftpSessionMock.InSequence(MockSequence)
64+
.Setup(session => session.RequestFStat(_handle, false))
65+
.Returns(_attributes);
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}
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68+
protected override void Arrange()
69+
{
70+
base.Arrange();
71+
72+
_target = new SftpFileStream(SftpSessionMock.Object, _path, _fileMode, _fileAccess, _bufferSize);
73+
_target.SetLength(_length);
74+
}
75+
76+
protected override void Act()
77+
{
78+
_actual = _target.Seek(_offset, SeekOrigin.End);
79+
}
80+
81+
[TestMethod]
82+
public void SeekShouldHaveReturnedOffset()
83+
{
84+
Assert.AreEqual(_attributes.Size + _offset, _actual);
85+
}
86+
87+
[TestMethod]
88+
public void IsOpenOnSftpSessionShouldHaveBeenInvokedTwice()
89+
{
90+
SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(2));
91+
}
92+
93+
[TestMethod]
94+
public void PositionShouldReturnOffset()
95+
{
96+
SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
97+
98+
Assert.AreEqual(_attributes.Size + _offset, _target.Position);
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SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(3));
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}
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}
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}

‎src/Renci.SshNet.Tests/Classes/Sftp/SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetZero.cs‎

Lines changed: 103 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,103 @@
1+
using System;
2+
using System.IO;
3+
using Microsoft.VisualStudio.TestTools.UnitTesting;
4+
using Moq;
5+
using Renci.SshNet.Sftp;
6+
7+
namespace Renci.SshNet.Tests.Classes.Sftp
8+
{
9+
[TestClass]
10+
public class SftpFileStreamTest_Seek_PositionedAtBeginningOfStream_OriginEndAndOffsetZero : SftpFileStreamTestBase
11+
{
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private Random _random;
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private string _path;
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private FileMode _fileMode;
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private FileAccess _fileAccess;
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private int _bufferSize;
17+
private uint _readBufferSize;
18+
private uint _writeBufferSize;
19+
private int _length;
20+
private byte[] _handle;
21+
private SftpFileStream _target;
22+
private int _offset;
23+
private SftpFileAttributes _attributes;
24+
private long _actual;
25+
26+
protected override void SetupData()
27+
{
28+
base.SetupData();
29+
30+
_random = new Random();
31+
_path = _random.Next().ToString();
32+
_fileMode = FileMode.OpenOrCreate;
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_fileAccess = FileAccess.Write;
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_bufferSize = _random.Next(5, 1000);
35+
_readBufferSize = (uint)_random.Next(5, 1000);
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_writeBufferSize = (uint)_random.Next(5, 1000);
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_length = _random.Next(5, 10000);
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_handle = GenerateRandom(_random.Next(1, 10), _random);
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_offset = 0;
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_attributes = SftpFileAttributes.Empty;
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}
42+
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protected override void SetupMocks()
44+
{
45+
SftpSessionMock.InSequence(MockSequence)
46+
.Setup(session => session.RequestOpen(_path, Flags.Write | Flags.CreateNewOrOpen, false))
47+
.Returns(_handle);
48+
SftpSessionMock.InSequence(MockSequence)
49+
.Setup(session => session.CalculateOptimalReadLength((uint)_bufferSize))
50+
.Returns(_readBufferSize);
51+
SftpSessionMock.InSequence(MockSequence)
52+
.Setup(session => session.CalculateOptimalWriteLength((uint)_bufferSize, _handle))
53+
.Returns(_writeBufferSize);
54+
SftpSessionMock.InSequence(MockSequence)
55+
.Setup(session => session.IsOpen)
56+
.Returns(true);
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SftpSessionMock.InSequence(MockSequence)
58+
.Setup(session => session.RequestFStat(_handle, false))
59+
.Returns(_attributes);
60+
SftpSessionMock.InSequence(MockSequence)
61+
.Setup(session => session.RequestFSetStat(_handle, _attributes));
62+
SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
63+
SftpSessionMock.InSequence(MockSequence)
64+
.Setup(session => session.RequestFStat(_handle, false))
65+
.Returns(_attributes);
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}
67+
68+
protected override void Arrange()
69+
{
70+
base.Arrange();
71+
72+
_target = new SftpFileStream(SftpSessionMock.Object, _path, _fileMode, _fileAccess, _bufferSize);
73+
_target.SetLength(_length);
74+
}
75+
76+
protected override void Act()
77+
{
78+
_actual = _target.Seek(_offset, SeekOrigin.End);
79+
}
80+
81+
[TestMethod]
82+
public void SeekShouldHaveReturnedSize()
83+
{
84+
Assert.AreEqual(_attributes.Size, _actual);
85+
}
86+
87+
[TestMethod]
88+
public void IsOpenOnSftpSessionShouldHaveBeenInvokedTwice()
89+
{
90+
SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(2));
91+
}
92+
93+
[TestMethod]
94+
public void PositionShouldReturnSize()
95+
{
96+
SftpSessionMock.InSequence(MockSequence).Setup(session => session.IsOpen).Returns(true);
97+
98+
Assert.AreEqual(_attributes.Size, _target.Position);
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100+
SftpSessionMock.Verify(session => session.IsOpen, Times.Exactly(3));
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}
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}
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}

‎src/Renci.SshNet/Sftp/SftpFileStream.cs‎

Lines changed: 22 additions & 40 deletions
Original file line numberDiff line numberDiff line change
@@ -788,26 +788,6 @@ public override long Seek(long offset, SeekOrigin origin)
788788
{
789789
// Flush the write buffer and then seek.
790790
FlushWriteBuffer();
791-
792-
switch (origin)
793-
{
794-
case SeekOrigin.Begin:
795-
newPosn = offset;
796-
break;
797-
case SeekOrigin.Current:
798-
newPosn = _position + offset;
799-
break;
800-
case SeekOrigin.End:
801-
var attributes = _session.RequestFStat(_handle, false);
802-
newPosn = attributes.Size - offset;
803-
break;
804-
}
805-
806-
if (newPosn == -1)
807-
{
808-
throw new EndOfStreamException("End of stream.");
809-
}
810-
_position = newPosn;
811791
}
812792
else
813793
{
@@ -838,29 +818,31 @@ public override long Seek(long offset, SeekOrigin origin)
838818
// Abandon the read buffer.
839819
_bufferPosition = 0;
840820
_bufferLen = 0;
821+
}
841822

842-
// Seek to the new position.
843-
switch (origin)
844-
{
845-
case SeekOrigin.Begin:
846-
newPosn = offset;
847-
break;
848-
case SeekOrigin.Current:
849-
newPosn = _position + offset;
850-
break;
851-
case SeekOrigin.End:
852-
var attributes = _session.RequestFStat(_handle, false);
853-
newPosn = attributes.Size - offset;
854-
break;
855-
}
856-
857-
if (newPosn < 0)
858-
{
859-
throw new EndOfStreamException();
860-
}
823+
// Seek to the new position.
824+
switch (origin)
825+
{
826+
case SeekOrigin.Begin:
827+
newPosn = offset;
828+
break;
829+
case SeekOrigin.Current:
830+
newPosn = _position + offset;
831+
break;
832+
case SeekOrigin.End:
833+
var attributes = _session.RequestFStat(_handle, false);
834+
newPosn = attributes.Size + offset;
835+
break;
836+
default:
837+
throw new ArgumentException(message: "Invalid seek origin.", paramName: "origin");
838+
}
861839

862-
_position = newPosn;
840+
if (newPosn < 0)
841+
{
842+
throw new EndOfStreamException();
863843
}
844+
845+
_position = newPosn;
864846
return _position;
865847
}
866848
}

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