Libraries

This change looks dramatic, but it's just separating out the already-split namespaces into separate top-level folders. In theory, every single one could be built into their own Nuget package. `SabreTools.IO.Meta` builds the normal Nuget package that is used by all other projects and includes all namespaces. `SabreTools.IO` builds to `SabreTools.IO.Common` to avoid overwriting issues on publish.

SabreTools.IO.Compression.Test/SabreTools.IO.Compression.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFrameworks>net8.0;net9.0;net10.0</TargetFrameworks>
+        <IsPackable>false</IsPackable>
+        <LangVersion>latest</LangVersion>
+        <Nullable>enable</Nullable>
+        <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+        <WarningsNotAsErrors>CS0618</WarningsNotAsErrors>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <None Remove="TestData\**" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <Content Include="TestData\**">
+            <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        </Content>
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="coverlet.collector" Version="8.0.0">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
+        <PackageReference Include="xunit" Version="2.9.3" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+            <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+            <PrivateAssets>all</PrivateAssets>
+        </PackageReference>
+    </ItemGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\SabreTools.IO.Compression\SabreTools.IO.Compression.csproj" />
+    </ItemGroup>
+
+</Project>

SabreTools.IO.Compression.Test/TestData/Subdirectory/sample.txt

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+Sample file for subdirectories

SabreTools.IO.Compression.Test/TestData/ascii.txt

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+This doesn't match anything

SabreTools.IO.Compression.Test/TestData/file-to-compress.bin

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+This is just a file that has a known set of hashes to make sure that everything with hashing is still working as anticipated.

SabreTools.IO.Compression.Test/TestData/utf16bebom.txt

@@ -0,0 +1 @@
+

SabreTools.IO.Compression.Test/TestData/utf16lebom.txt

@@ -0,0 +1 @@
+

SabreTools.IO.Compression.Test/TestData/utf7bom.txt

@@ -0,0 +1 @@
++/v

SabreTools.IO.Compression.Test/TestData/utf8bom.txt

@@ -0,0 +1 @@
+

SabreTools.IO.Compression/ExtensionAttribute.cs

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+#if NET20
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method)]
+    internal sealed class ExtensionAttribute : Attribute { }
+}
+
+#endif

SabreTools.IO.Compression/SabreTools.IO.Compression.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <!-- Assembly Properties -->
+        <TargetFrameworks>net20;net35;net40;net452;net462;net472;net48;netcoreapp3.1;net5.0;net6.0;net7.0;net8.0;net9.0;net10.0;netstandard2.0;netstandard2.1</TargetFrameworks>
+        <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+        <IncludeSymbols>true</IncludeSymbols>
+        <LangVersion>latest</LangVersion>
+        <NoWarn>CS0618</NoWarn>
+        <Nullable>enable</Nullable>
+        <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
+        <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+        <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+        <Version>1.9.1</Version>
+
+        <!-- Package Properties -->
+        <Authors>Matt Nadareski</Authors>
+        <Description>Common IO utilities by other SabreTools projects</Description>
+        <Copyright>Copyright (c) Matt Nadareski 2019-2025</Copyright>
+        <PackageProjectUrl>https://github.com/SabreTools/</PackageProjectUrl>
+        <PackageReadmeFile>README.md</PackageReadmeFile>
+        <RepositoryUrl>https://github.com/SabreTools/SabreTools.IO</RepositoryUrl>
+        <RepositoryType>git</RepositoryType>
+        <PackageTags>io reading writing ini csv ssv tsv</PackageTags>
+        <PackageLicenseExpression>MIT</PackageLicenseExpression>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <None Include="README.md" Pack="true" PackagePath="" />
+    </ItemGroup>
+
+    <ItemGroup>
+        <PackageReference Include="GrindCore" Version="0.7.0" Condition="!$(TargetFramework.StartsWith(`net2`))" />
+        <PackageReference Include="SabreTools.Hashing" Version="[1.6.1]" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\SabreTools.IO.Extensions\SabreTools.IO.Extensions.csproj" />
+    </ItemGroup>
+
+</Project>