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Fix Seek Operations in SftpFileStream #910

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Merged
merged 7 commits into from
Nov 29, 2022
Merged

Fix Seek Operations in SftpFileStream #910

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bdcf48b
Update .gitignore
lemonyte Jan 5, 2022
a6b5e6e
Fix offset operations in SftpFileStream.Seek
lemonyte Jan 5, 2022
161c87e
Fix seek exception message and add default case for invalid seek origin
lemonyte Feb 16, 2022
731571c
Revert .gitignore changes
lemonyte Nov 18, 2022
fcf3c56
Use named params when throwing ArgumentException
lemonyte Nov 18, 2022
0cf229a
Add tests for seeking from end of file
lemonyte Nov 18, 2022
8d7e004
Fix seek tests
lemonyte Nov 18, 2022
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3 changes: 3 additions & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -22,3 +22,6 @@ project.lock.json

# Build outputs
build/target/

# Visual Studio cache/options directory
.vs/
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@drieseng drieseng Nov 14, 2022

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Please add leading forward slash since this ignore only applies to the root directory of the repo.

59 changes: 19 additions & 40 deletions src/Renci.SshNet/Sftp/SftpFileStream.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -788,26 +788,6 @@ public override long Seek(long offset, SeekOrigin origin)
{
// Flush the write buffer and then seek.
FlushWriteBuffer();

switch (origin)
{
case SeekOrigin.Begin:
newPosn = offset;
break;
case SeekOrigin.Current:
newPosn = _position + offset;
break;
case SeekOrigin.End:
var attributes = _session.RequestFStat(_handle, false);
newPosn = attributes.Size - offset;
break;
}

if (newPosn == -1)
{
throw new EndOfStreamException("End of stream.");
}
_position = newPosn;
}
else
{
Expand Down Expand Up @@ -838,29 +818,28 @@ public override long Seek(long offset, SeekOrigin origin)
// Abandon the read buffer.
_bufferPosition = 0;
_bufferLen = 0;
}

// Seek to the new position.
switch (origin)
{
case SeekOrigin.Begin:
newPosn = offset;
break;
case SeekOrigin.Current:
newPosn = _position + offset;
break;
case SeekOrigin.End:
var attributes = _session.RequestFStat(_handle, false);
newPosn = attributes.Size - offset;
break;
}

if (newPosn < 0)
{
throw new EndOfStreamException();
}
// Seek to the new position.
switch (origin)
{
case SeekOrigin.Begin:
newPosn = offset;
break;
case SeekOrigin.Current:
newPosn = _position + offset;
break;
case SeekOrigin.End:
var attributes = _session.RequestFStat(_handle, false);
newPosn = attributes.Size + offset;
break;
}

_position = newPosn;
if (newPosn < 0)
{
throw new EndOfStreamException("End of stream.");
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@IgorMilavec IgorMilavec Feb 15, 2022

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You are providing a non-default exception message, causing the test SeekShouldHaveThrownEndOfStreamException to fail. I beleive if you just use throw new EndOfStreamException(); this will be fixed.

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@lemonyte lemonyte Feb 16, 2022

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Thanks for pointing that out. The exception message is already present in another part of the code, so I assumed I should leave it in there.

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@IgorMilavec IgorMilavec Feb 16, 2022

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@drieseng There have been suggestions in other issues that we should localize exception messages. While that is probably too much work at this time, I propose to use default exception messages where possible and to stop checking error messages in the tests and rely on only asserting exception type (and other structured info in the exception) in the tests. Do you agree?

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@lemonyte lemonyte Feb 16, 2022

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I have noticed that the exception message format is different across .NET versions. For example:
.NET Framework 3.5

ArgumentException error message.
Parameter name: ParamName

.NET Core 3.0

ArgumentException error message. (Parameter 'ParamName')

This causes some tests to pass on one framework and fail on another.

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@drieseng drieseng Nov 15, 2022

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@IgorMilavec, in general I prefer very specific asserts. To be honest, I think we have more important stuff to deal with than localization. But I'm ok to discuss this as a team, and decide where we want to go with this.

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@drieseng drieseng Nov 15, 2022

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@LemonPi314, that's indeed something I was already aware of and which I dealt with in other (professional) projects.

}
_position = newPosn;
return _position;
}
}
Expand Down