Initial commit - WPinternals 2.6

2026-06-16 20:30:12 +10:00 · 2018-10-25 22:35:49 +02:00
commit 396ae57f05
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+//
+// Copyright (c) 2008-2011, Kenneth Bell
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+
+namespace DiscUtils.Compression
+{
+    using System;
+    using System.Globalization;
+
+    internal abstract class DataBlockTransform
+    {
+        protected abstract bool BuffersMustNotOverlap { get; }
+
+        public int Process(byte[] input, int inputOffset, int inputCount, byte[] output, int outputOffset)
+        {
+            if (output.Length < outputOffset + (long)MinOutputCount(inputCount))
+            {
+                throw new ArgumentException(
+                    string.Format(
+                    CultureInfo.InvariantCulture,
+                    "Output buffer to small, must be at least {0} bytes may need to be {1} bytes",
+                    MinOutputCount(inputCount),
+                    MaxOutputCount(inputCount)));
+            }
+
+            if (BuffersMustNotOverlap)
+            {
+                int maxOut = MaxOutputCount(inputCount);
+
+                if (input == output
+                    && (inputOffset + (long)inputCount > outputOffset)
+                    && (inputOffset <= outputOffset + (long)maxOut))
+                {
+                    byte[] tempBuffer = new byte[maxOut];
+
+                    int outCount = DoProcess(input, inputOffset, inputCount, tempBuffer, 0);
+                    Array.Copy(tempBuffer, 0, output, outputOffset, outCount);
+
+                    return outCount;
+                }
+            }
+
+            return DoProcess(input, inputOffset, inputCount, output, outputOffset);
+        }
+
+        protected abstract int DoProcess(byte[] input, int inputOffset, int inputCount, byte[] output, int outputOffset);
+
+        protected abstract int MaxOutputCount(int inputCount);
+
+        protected abstract int MinOutputCount(int inputCount);
+    }
+}