Joseph Doherty
68cf3ae8b7
Live read-only check against a production CompactLogix press: Program:UN01_Press._ModeNames (STR0016[32], 4 elements requested) returned an 80-byte buffer with libplctag.NET 1.5.2's ElementSize unset. The driver fell back to the static 88-byte STRING stride, read element 1 past the buffer, and the whole read failed (ErrorOutOfBounds -> BadCommunicationError). When the buffer divides evenly by the element count, that quotient is now the stride; the read returns [undefined, Production, Maintenance, Manual] as the controller holds.
46 lines
1.9 KiB
C#
46 lines
1.9 KiB
C#
using Shouldly;
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using Xunit;
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using ZB.MOM.WW.OtOpcUa.Driver.AbCip;
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namespace ZB.MOM.WW.OtOpcUa.Driver.AbCip.Tests;
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/// <summary>
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/// Array element stride. Seen live on a production CompactLogix: reading
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/// <c>Program:UN01_Press._ModeNames</c> (<c>STR0016[32]</c>, 4 elements requested) returned an
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/// 80-byte buffer with libplctag's <c>ElementSize</c> unset; the driver strode 88 bytes (built-in
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/// STRING) and the read failed <c>ErrorOutOfBounds</c>. The real values were
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/// "undefined" / "Production" / "Maintenance" / "Manual" at a 20-byte stride.
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/// </summary>
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[Trait("Category", "Unit")]
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public sealed class AbCipArrayStrideTests
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{
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/// <summary>A user string type's stride comes from the buffer, not the built-in STRING size.</summary>
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[Fact]
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public void User_string_array_strides_by_buffer_size_over_count()
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{
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LibplctagTagRuntime.ResolveArrayStride(null, bufferSize: 80, count: 4, AbCipDataType.String).ShouldBe(20);
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}
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/// <summary>The built-in STRING still strides 88.</summary>
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[Fact]
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public void Builtin_STRING_array_strides_88()
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{
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LibplctagTagRuntime.ResolveArrayStride(null, bufferSize: 3 * 88, count: 3, AbCipDataType.String).ShouldBe(88);
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}
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/// <summary>libplctag's own element size wins when it is populated.</summary>
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[Fact]
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public void Reported_element_size_wins()
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{
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LibplctagTagRuntime.ResolveArrayStride(4, bufferSize: 80, count: 4, AbCipDataType.DInt).ShouldBe(4);
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}
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/// <summary>An empty or uneven buffer falls back to the static per-type size.</summary>
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[Fact]
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public void Empty_or_uneven_buffer_falls_back_to_the_type_size()
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{
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LibplctagTagRuntime.ResolveArrayStride(null, bufferSize: 0, count: 4, AbCipDataType.Real).ShouldBe(4);
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LibplctagTagRuntime.ResolveArrayStride(null, bufferSize: 81, count: 4, AbCipDataType.String).ShouldBe(88);
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}
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}
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