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- //------------------------------------------------------------
- // Game Framework
- // Copyright © 2013-2021 loyalsoft. All rights reserved.
- // Homepage: http://www.game7000.com/
- // Feedback: http://www.game7000.com/
- //------------------------------------------------------------
- using GameFramework;
- using ICSharpCode.SharpZipLib.GZip;
- using System;
- using System.IO;
- namespace UnityGameFramework.Runtime
- {
- /// <summary>
- /// 默认压缩解压缩辅助器。
- /// </summary>
- public class DefaultCompressionHelper : Utility.Compression.ICompressionHelper
- {
- private const int CachedBytesLength = 0x1000;
- private readonly byte[] m_CachedBytes = new byte[CachedBytesLength];
- /// <summary>
- /// 压缩数据。
- /// </summary>
- /// <param name="bytes">要压缩的数据的二进制流。</param>
- /// <param name="offset">要压缩的数据的二进制流的偏移。</param>
- /// <param name="length">要压缩的数据的二进制流的长度。</param>
- /// <param name="compressedStream">压缩后的数据的二进制流。</param>
- /// <returns>是否压缩数据成功。</returns>
- public bool Compress(byte[] bytes, int offset, int length, Stream compressedStream)
- {
- if (bytes == null)
- {
- return false;
- }
- if (offset < 0 || length < 0 || offset + length > bytes.Length)
- {
- return false;
- }
- if (compressedStream == null)
- {
- return false;
- }
- try
- {
- GZipOutputStream gZipOutputStream = new GZipOutputStream(compressedStream);
- gZipOutputStream.Write(bytes, offset, length);
- gZipOutputStream.Finish();
- ProcessHeader(compressedStream);
- return true;
- }
- catch
- {
- return false;
- }
- }
- /// <summary>
- /// 压缩数据。
- /// </summary>
- /// <param name="stream">要压缩的数据的二进制流。</param>
- /// <param name="compressedStream">压缩后的数据的二进制流。</param>
- /// <returns>是否压缩数据成功。</returns>
- public bool Compress(Stream stream, Stream compressedStream)
- {
- if (stream == null)
- {
- return false;
- }
- if (compressedStream == null)
- {
- return false;
- }
- try
- {
- GZipOutputStream gZipOutputStream = new GZipOutputStream(compressedStream);
- int bytesRead = 0;
- while ((bytesRead = stream.Read(m_CachedBytes, 0, CachedBytesLength)) > 0)
- {
- gZipOutputStream.Write(m_CachedBytes, 0, bytesRead);
- }
- gZipOutputStream.Finish();
- ProcessHeader(compressedStream);
- return true;
- }
- catch
- {
- return false;
- }
- finally
- {
- Array.Clear(m_CachedBytes, 0, CachedBytesLength);
- }
- }
- /// <summary>
- /// 解压缩数据。
- /// </summary>
- /// <param name="bytes">要解压缩的数据的二进制流。</param>
- /// <param name="offset">要解压缩的数据的二进制流的偏移。</param>
- /// <param name="length">要解压缩的数据的二进制流的长度。</param>
- /// <param name="decompressedStream">解压缩后的数据的二进制流。</param>
- /// <returns>是否解压缩数据成功。</returns>
- public bool Decompress(byte[] bytes, int offset, int length, Stream decompressedStream)
- {
- if (bytes == null)
- {
- return false;
- }
- if (offset < 0 || length < 0 || offset + length > bytes.Length)
- {
- return false;
- }
- if (decompressedStream == null)
- {
- return false;
- }
- MemoryStream memoryStream = null;
- try
- {
- memoryStream = new MemoryStream(bytes, offset, length, false);
- using (GZipInputStream gZipInputStream = new GZipInputStream(memoryStream))
- {
- int bytesRead = 0;
- while ((bytesRead = gZipInputStream.Read(m_CachedBytes, 0, CachedBytesLength)) > 0)
- {
- decompressedStream.Write(m_CachedBytes, 0, bytesRead);
- }
- }
- return true;
- }
- catch
- {
- return false;
- }
- finally
- {
- if (memoryStream != null)
- {
- memoryStream.Dispose();
- memoryStream = null;
- }
- Array.Clear(m_CachedBytes, 0, CachedBytesLength);
- }
- }
- /// <summary>
- /// 解压缩数据。
- /// </summary>
- /// <param name="stream">要解压缩的数据的二进制流。</param>
- /// <param name="decompressedStream">解压缩后的数据的二进制流。</param>
- /// <returns>是否解压缩数据成功。</returns>
- public bool Decompress(Stream stream, Stream decompressedStream)
- {
- if (stream == null)
- {
- return false;
- }
- if (decompressedStream == null)
- {
- return false;
- }
- try
- {
- GZipInputStream gZipInputStream = new GZipInputStream(stream);
- int bytesRead = 0;
- while ((bytesRead = gZipInputStream.Read(m_CachedBytes, 0, CachedBytesLength)) > 0)
- {
- decompressedStream.Write(m_CachedBytes, 0, bytesRead);
- }
- return true;
- }
- catch
- {
- return false;
- }
- finally
- {
- Array.Clear(m_CachedBytes, 0, CachedBytesLength);
- }
- }
- private static void ProcessHeader(Stream compressedStream)
- {
- if (compressedStream.Length >= 8L)
- {
- long current = compressedStream.Position;
- compressedStream.Position = 4L;
- compressedStream.WriteByte(25);
- compressedStream.WriteByte(134);
- compressedStream.WriteByte(2);
- compressedStream.WriteByte(32);
- compressedStream.Position = current;
- }
- }
- }
- }
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