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workaround for nanoframework/Home#1529
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34 changes: 34 additions & 0 deletions
34
TestsHardware/MakoIoT.Device.Services.FileStorage.DeviceTest/StreamExtensionTest.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| | ||
| using System.IO; | ||
| using System.Text; | ||
| using MakoIoT.Device.Services.FileStorage.Extensions; | ||
| using nanoFramework.TestFramework; | ||
|
|
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| namespace MakoIoT.Device.Services.FileStorage.DeviceTest | ||
| { | ||
| [TestClass] | ||
| public class StreamExtensionTest | ||
| { | ||
| [TestMethod] | ||
| public void SafeGetLength_should_keep_stream_position() | ||
| { | ||
|
|
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| File.WriteAllBytes("I:\\loremipsum.txt", Encoding.UTF8.GetBytes(Lorem)); | ||
|
|
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| using (var fs = new FileStream("I:\\loremipsum.txt", FileMode.Open)) | ||
| { | ||
| var buffer = new byte[10]; | ||
| //read 10 bytes | ||
| fs.Read(buffer, 0, 10); | ||
| //get position | ||
| Assert.AreEqual(10, fs.Position, "before getting stream length"); | ||
| //get length | ||
| var length = fs.SafeGetLength(); | ||
| //get position again | ||
| Assert.AreEqual(10, fs.Position, "after getting stream length"); | ||
| } | ||
| } | ||
|
|
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| private const string Lorem = @"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque lacinia pellentesque pharetra. Nulla a tortor in nunc facilisis cursus nec id felis."; | ||
| } | ||
| } |
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15 changes: 15 additions & 0 deletions
15
src/MakoIoT.Device.Services.FileStorage/Extensions/StreamExtension.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| using System.IO; | ||
|
|
||
| namespace MakoIoT.Device.Services.FileStorage.Extensions | ||
| { | ||
| public static class StreamExtension | ||
| { | ||
| public static int SafeGetLength(this Stream stream) | ||
| { | ||
| var position = stream.Position; | ||
| var length = (int)stream.Length; | ||
| stream.Position = position; | ||
| return length; | ||
| } | ||
| } | ||
| } |
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