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