/// <summary>
/// 解压缩数据
/// </summary>
/// <param name="compressData">压缩数据</param>
/// <param name="type">压缩类型</param>
/// <param name="startIndex">起始位置</param>
/// <param name="count">解压缩字节数</param>
/// <returns>解压缩后的数据</returns>
public static memoryStream getDeCompressStream(this byte[] compressData, compression type, int startIndex, int count)
{
array.range range = new array.range(compressData.length(), startIndex, count);
if (count == range.GetCount)
{
using (Stream memoryStream = new MemoryStream(compressData, 0, compressData.Length))
using (Stream compressStream = memoryStream.toCompressStream(CompressionMode.Decompress, false, type))
{
memoryStream dataStream = new memoryStream(compressData.Length);
byte[] buffer = new byte[config.pub.Default.StreamBufferLength];
for (int readLength = compressStream.Read(buffer, 0, config.pub.Default.StreamBufferLength);
readLength != 0;
readLength = compressStream.Read(buffer, 0, config.pub.Default.StreamBufferLength))
{
dataStream.Write(buffer, 0, readLength);
}
return dataStream;
}
}
else if (count == 0) return null;
log.Default.Throw(log.exceptionType.IndexOutOfRange);
return null;
}
/// <summary>
/// 压缩数据
/// </summary>
/// <param name="oldData">原始数据</param>
/// <param name="type">压缩类型</param>
/// <param name="startIndex">起始位置</param>
/// <param name="count">压缩字节数</param>
/// <returns>压缩后的数据,失败返回null</returns>
public static byte[] getCompress(this byte[] oldData, compression type, int startIndex, int count)
{
array.range range = new array.range(oldData.length(), startIndex, count);
if (count == range.GetCount)
{
using (MemoryStream dataStream = new MemoryStream())
{
using (Stream compressStream = dataStream.toCompressStream(CompressionMode.Compress, true, type))
{
compressStream.Write(oldData, startIndex, count);
}
if (dataStream.Position < oldData.Length)
{
if (dataStream.Length != dataStream.Position) dataStream.SetLength(dataStream.Position);
return dataStream.ToArray();
}
}
return null;
}
else if (count == 0) return null;
log.Default.Throw(log.exceptionType.IndexOutOfRange);
return null;
}
