Add a documentation site

Author: brantburnett

.github/workflows/pages.yml

@@ -0,0 +1,55 @@
+on:
+  push:
+    branches:
+      - main
+      - docs # temporary for testing
+  
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: pages
+  cancel-in-progress: false
+
+jobs:
+  build-docs:
+    name: Build Documentation
+    
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 8.0.x
+
+      - name: Install docfX
+        run: dotnet tool update -g docfx
+      - name: Build documentation
+        run: docfx docfx.json
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: 'artifacts/_site'
+
+  publish-docs:
+    name: Publish Documentation
+    needs: build-docs
+
+    # Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+    permissions:
+      actions: read
+      pages: write
+      id-token: write
+
+    # Deploy to the github-pages environment
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-latest
+    steps:
+    - name: Deploy to GitHub Pages
+      id: deployment
+      uses: actions/deploy-pages@v4

.gitignore

@@ -24,3 +24,4 @@ BenchmarkDotNet.Artifacts/
 test-results/
 TestResults/
 .DS_Store
+/api/

Snappier/Snappier.csproj

@@ -44,7 +44,7 @@
 
   <ItemGroup>
     <None Include="..\README.md" Pack="true" PackagePath="$(PackageReadmeFile)" />
-    <None Include="..\icon.png" Pack="true" PackagePath="$(PackageIcon)" />
+    <None Include="..\images\icon.png" Pack="true" PackagePath="$(PackageIcon)" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">

docfx.json

@@ -0,0 +1,53 @@
+{
+  "$schema": "https://raw.githubusercontent.com/dotnet/docfx/main/schemas/docfx.schema.json",
+  "metadata": [
+    {
+      "src": [
+        {
+          "src": "./Snappier",
+          "files": [
+            "**/*.csproj"
+          ]
+        }
+      ],
+      "dest": "api",
+      "properties": {
+        "TargetFramework": "net8.0"
+      }
+    }
+  ],
+  "build": {
+    "content": [
+      {
+        "files": [
+          "**/*.{md,yml}"
+        ],
+        "exclude": [
+          "_site/**",
+          "artifacts/**",
+          "**/BenchmarkDotNet.Artifacts/**"
+        ]
+      }
+    ],
+    "resource": [
+      {
+        "files": [
+          "images/**"
+        ]
+      }
+    ],
+    "output": "artifacts/_site",
+    "template": [
+      "default",
+      "material/material"
+    ],
+    "globalMetadata": {
+      "_appName": "Snappier",
+      "_appTitle": "Snappier",
+      "_appLogoPath": "images/icon-48.png",
+      "_disableContribution": true,
+      "_enableSearch": true,
+      "pdf": false
+    }
+  }
+}

docs/block.md

@@ -0,0 +1,129 @@
+# Block Compression
+
+Block compression is ideal for data up to 64KB, though it may be used for data of any size. It does not include any stream
+framing or CRC validation. It also doesn't automatically revert to uncompressed data in the event of data size growth.
+
+## Block compression/decompression using a buffer you already own
+
+```cs
+using Snappier;
+
+public class Program
+{
+    private static byte[] Data = {0, 1, 2}; // Wherever you get the data from
+
+    public static void Main()
+    {
+        // This option assumes that you are managing buffers yourself in an efficient way.
+        // In this example, we're using heap allocated byte arrays, however in most cases
+        // you would get these buffers from a buffer pool like ArrayPool<byte> or MemoryPool<byte>.
+
+        // If the output buffer is too small, an ArgumentException is thrown. This will not
+        // occur in this example because a sufficient buffer is always allocated via 
+        // Snappy.GetMaxCompressedLength or Snappy.GetUncompressedLength. There are TryCompress
+        // and TryDecompress overloads that return false if the output buffer is too small
+        // rather than throwing an exception.
+
+        // Compression
+        byte[] buffer = new byte[Snappy.GetMaxCompressedLength(Data)];
+        int compressedLength = Snappy.Compress(Data, buffer);
+        Span<byte> compressed = buffer.AsSpan(0, compressedLength);
+
+        // Decompression
+        byte[] outputBuffer = new byte[Snappy.GetUncompressedLength(compressed)];
+        int decompressedLength = Snappy.Decompress(compressed, outputBuffer);
+
+        for (var i = 0; i < decompressedLength; i++)
+        {
+            // Do something with the data
+        }
+    }
+}
+```
+
+## Block compression/decompression using a memory pool buffer
+
+```cs
+using Snappier;
+
+public class Program
+{
+    private static byte[] Data = {0, 1, 2}; // Wherever you get the data from
+
+    public static void Main()
+    {
+        // This option uses `MemoryPool<byte>.Shared`. However, if you fail to
+        // dispose of the returned buffers correctly it can result in inefficient garbage collection.
+        // It is important to either call .Dispose() or use a using statement.
+
+        // Compression
+        using (IMemoryOwner<byte> compressed = Snappy.CompressToMemory(Data))
+        {
+            // Decompression
+            using (IMemoryOwner<byte> decompressed = Snappy.DecompressToMemory(compressed.Memory.Span))
+            {
+                // Do something with the data
+            }
+        }
+    }
+}
+```
+
+## Block compression/decompression using a buffer writter
+
+```cs
+using Snappier;
+using System.Buffers;
+
+public class Program
+{
+    private static byte[] Data = {0, 1, 2}; // Wherever you get the data from
+
+    public static void Main()
+    {
+        // This option uses `IBufferWriter<byte>`. In .NET 6 you can get a simple
+        // implementation such as `ArrayBufferWriter<byte>` but it may also be a `PipeWriter<byte>`
+        // or any other more advanced implementation of `IBufferWriter<byte>`.
+        
+        // These overloads also accept a `ReadOnlySequence<byte>` which allows the source data
+        // to be made up of buffer segments rather than one large buffer. However, segment size
+        // may be a factor in performance. For compression, segments that are some multiple of
+        // 64KB are recommended. For decompression, simply avoid small segments.
+
+        // Compression
+        var compressedBufferWriter = new ArrayBufferWriter<byte>();
+        Snappy.Compress(new ReadOnlySequence<byte>(Data), compressedBufferWriter);
+        var compressedData = compressedBufferWriter.WrittenMemory;
+
+        // Decompression
+        var decompressedBufferWriter = new ArrayBufferWriter<byte>();
+        Snappy.Decompress(new ReadOnlySequence<byte>(compressedData), decompressedBufferWriter);
+        var decompressedData = decompressedBufferWriter.WrittenMemory;
+
+        // Do something with the data
+    }
+}
+```
+
+## Block compression/decompression using heap allocated byte[]
+
+```cs
+using Snappier;
+
+public class Program
+{
+    private static byte[] Data = {0, 1, 2}; // Wherever you get the data from
+
+    public static void Main()
+    {
+        // This is generally the least efficient option,
+        // but in some cases may be the simplest to implement.
+
+        // Compression
+        byte[] compressed = Snappy.CompressToArray(Data);
+
+        // Decompression
+        byte[] decompressed = Snappy.DecompressToArray(compressed);
+    }
+}
+```

docs/getting-started.md

@@ -0,0 +1,15 @@
+# Getting Started
+
+## Installing
+
+Simply add a NuGet package reference to the latest version of Snappier.
+
+```xml
+<PackageReference Include="Snappier" Version="1.1.6" />
+```
+
+or
+
+```sh
+dotnet add package Snappier
+```

docs/stream.md

@@ -0,0 +1,49 @@
+# Stream Compression
+
+Stream compression reads or writes the [Snappy framing format](https://github.com/google/snappy/blob/master/framing_format.txt) designed for streaming. 
+It is ideal for data being sent over a network stream, and includes additional framing data and CRC validation.
+It also recognizes when an individual block in the stream compresses poorly and will include it in uncompressed form.
+
+## Stream compression/decompression
+
+Compressing or decompressing a stream follows the same paradigm as other compression streams in .NET. `SnappyStream` wraps an inner stream. If decompressing you read from the `SnappyStream`, if compressing you write to the `SnappyStream`
+
+```cs
+using System.IO;
+using System.IO.Compression;
+using Snappier;
+
+public class Program
+{
+    public static async Task Main()
+    {
+        using var fileStream = File.OpenRead("somefile.txt");
+
+        // First, compression
+        using var compressed = new MemoryStream();
+
+        using (var compressor = new SnappyStream(compressed, CompressionMode.Compress, leaveOpen: true))
+        {
+            await fileStream.CopyToAsync(compressor);
+
+            // Disposing the compressor also flushes the buffers to the inner stream
+            // We pass true to the constructor above so that it doesn't close/dispose the inner stream
+            // Alternatively, we could call compressor.Flush()
+        }
+
+        // Then, decompression
+
+        compressed.Position = 0; // Reset to beginning of the stream so we can read
+        using var decompressor = new SnappyStream(compressed, CompressionMode.Decompress);
+
+        var buffer = new byte[65536];
+        var bytesRead = decompressor.Read(buffer, 0, buffer.Length);
+        while (bytesRead > 0)
+        {
+            // Do something with the data
+
+            bytesRead = decompressor.Read(buffer, 0, buffer.Length)
+        }
+    }
+}
+```

docs/toc.yml

@@ -0,0 +1,6 @@
+- name: Getting Started
+  href: getting-started.md
+- name: Block Compression
+  href: block.md
+- name: Stream Compression
+  href: stream.md

images/icon-48.png

@@ -0,0 +1,27 @@
+---
+_layout: landing
+---
+
+# Snappier
+
+Snappier is a pure C# port of Google's [Snappy](https://github.com/google/snappy) compression algorithm. It is designed with speed as the primary goal, rather than compression ratio, and is ideal for compressing network traffic. Please see [the Snappy README file](https://github.com/google/snappy/blob/master/README.md) for more details on Snappy.
+
+## Project Goals
+
+The Snappier project aims to meet the following needs of the .NET community.
+
+- Cross-platform C# implementation for Linux and Windows, without P/Invoke or special OS installation requirements
+- Compatible with .NET 4.6.1 and later and .NET 6 and later
+- Use .NET paradigms, including asynchronous stream support
+- Full compatibility with both block and stream formats
+- Near C++ level performance
+  - Note: This is only possible on .NET 6 and later with the aid of [Span<T>](https://docs.microsoft.com/en-us/dotnet/api/system.span-1?view=netcore-3.1) and [System.Runtime.Intrinsics](https://fiigii.com/2019/03/03/Hardware-intrinsic-in-NET-Core-3-0-Introduction/).
+  - .NET 4.6.1 is the slowest
+- Keep allocations and garbage collection to a minimum using buffer pools
+
+## Other Projects
+
+There are other projects available for C#/.NET which implement Snappy compression.
+
+- [Snappy.NET](https://snappy.machinezoo.com/) - Uses P/Invoke to C++ for great performance. However, it only works on Windows, and is a bit heap allocation heavy in some cases. It also hasn't been updated since 2014 (as of 10/2020). This project may still be the best choice if your project is on the legacy .NET Framework on Windows, where Snappier is much less performant.
+- [IronSnappy](https://github.com/aloneguid/IronSnappy) - Another pure C# port, based on the Golang implementation instead of the C++ implementation.

icon.png renamed to images/icon.png

@@ -0,0 +1,4 @@
+- name: Documentation
+  href: docs/
+- name: API
+  href: api/