Native compression lib first build, managed, and tests

1 files changed, 91 insertions, 0 deletions

diff --git a/lib/Net.Compression/VNLib.Net.Compression/ThrowHelper.cs b/lib/Net.Compression/VNLib.Net.Compression/ThrowHelper.cs
new file mode 100644
index 0000000..2793526
--- /dev/null
+++ b/lib/Net.Compression/VNLib.Net.Compression/ThrowHelper.cs
@@ -0,0 +1,91 @@
+/*
+* Copyright (c) 2023 Vaughn Nugent
+* 
+* Library: VNLib
+* Package: VNLib.Net.Compression
+* File: ThrowHelper.cs 
+*
+* ThrowHelper.cs is part of VNLib.Net.Compression which is part of 
+* the larger VNLib collection of libraries and utilities.
+*
+* VNLib.Net.Compression is free software: you can redistribute it and/or modify 
+* it under the terms of the GNU General Public License as published
+* by the Free Software Foundation, either version 2 of the License,
+* or (at your option) any later version.
+*
+* VNLib.Net.Compression is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
+* General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License 
+* along with VNLib.Net.Compression. If not, see http://www.gnu.org/licenses/.
+*/
+
+using System;
+
+using VNLib.Utils;
+
+namespace VNLib.Net.Compression
+{
+    internal static class ThrowHelper
+    {
+        /*
+         * Error codes correspond to constants 
+         * in the native compression library
+         */
+        enum NativeErrorType
+        {
+            ErrInvalidPtr = -1,
+            ErrOutOfMemory = -2,
+            
+            ErrCompTypeNotSupported = -9,
+            ErrCompLevelNotSupported = -10,
+            ErrInvalidInput = -11,
+            ErrInvalidOutput = -12,
+
+            ErrGzInvalidState = -16,
+            ErrGzOverflow = -17,
+
+            ErrBrInvalidState = -24
+        }
+
+        /// <summary>
+        /// Determines if the specified result is an error and throws an exception if it is
+        /// </summary>
+        /// <param name="result"></param>
+        /// <exception cref="NativeCompressionException"></exception>
+        public static void ThrowIfError(ERRNO result)
+        {
+            //Check for no error
+            if(result > 0)
+            {
+                return;
+            }
+
+            switch ((NativeErrorType)(int)result)
+            {
+                case NativeErrorType.ErrInvalidPtr:
+                    throw new NativeCompressionException("A pointer to a compressor instance was null");
+                case NativeErrorType.ErrOutOfMemory:
+                    throw new NativeCompressionException("An operation falied because the system is out of memory");
+                case NativeErrorType.ErrCompTypeNotSupported:
+                    throw new NotSupportedException("The desired compression method is not supported by the native library");
+                case NativeErrorType.ErrCompLevelNotSupported:
+                    throw new NotSupportedException("The desired compression level is not supported by the native library");
+                case NativeErrorType.ErrInvalidInput:
+                    throw new NativeCompressionException("The input buffer was null and the input size was greater than 0");
+                case NativeErrorType.ErrInvalidOutput:
+                    throw new NativeCompressionException("The output buffer was null and the output size was greater than 0");
+                case NativeErrorType.ErrGzInvalidState:
+                    throw new NativeCompressionException("A gzip operation failed because the compressor state is invalid (null compressor pointer)");
+                case NativeErrorType.ErrGzOverflow:
+                    throw new NativeCompressionException("A gzip operation failed because the output buffer is too small");
+                case NativeErrorType.ErrBrInvalidState:
+                    throw new NativeCompressionException("A brotli operation failed because the compressor state is invalid (null compressor pointer)");
+                default:
+                    break;
+            }
+        }
+    }
+}
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