/// <summary>
/// Compress a string
/// </summary>
/// <param name="text">String to compress</param>
/// <returns>Compressed buffer</returns>
public static byte[] CompressString(string text)
{
if (text == null || text.Length == 0)
{
return(null);
}
byte[] buf = Encoding.Unicode.GetBytes(text);
return(ByteCompression.Compress(buf, buf.Length));
}
/// <summary>
/// Decompress a string
/// </summary>
/// <param name="compressedText">Compressed buffer</param>
/// <param name="offset">Offset into buf to begin decompression</param>
/// <returns>Decompressed string</returns>
public static string DecompressString(byte[] compressedText, int offset, int dataLength)
{
int len = 0;
int bytesReturned = 0;
byte[] buf = ByteCompression.Decompress(compressedText, offset, dataLength, ref bytesReturned, ref len);
if (buf == null)
{
return(null);
}
try
{
return(Encoding.Unicode.GetString(buf, 0, bytesReturned));
}
finally
{
ByteCompression.Recycle(buf);
}
}
/// <summary>
/// Decompress a string
/// </summary>
/// <param name="compressedText">Compressed buffer</param>
/// <param name="offset">Offset into buf to begin decompression</param>
/// <param name="bytesUsed">Used to inform caller of the number of bytes from buf that were actually decompressed</param>
/// <returns>Decompressed string</returns>
public static string DecompressString(byte[] compressedText, int offset, int dataLength, ref int bytesUsed)
{
try
{
int len = 0;
int bytesReturned = 0;
byte[] buf = ByteCompression.Decompress(compressedText, offset, dataLength, ref bytesReturned, ref len);
bytesUsed = len;
if (buf == null)
{
return(null);
}
try
{
if (bytesReturned < 1048576)
{
return(Encoding.Unicode.GetString(buf, 0, bytesReturned));
}
else
{
int retry = 10;
while (true)
{
try
{
retry--;
string ret = "";
int o = 0;
while (o < bytesReturned)
{
int read = 1048576;
if ((bytesReturned - o) < 1048576)
{
read = (bytesReturned - o);
}
ret += Encoding.Unicode.GetString(buf, o, read);
o += read;
}
return(ret);
}
catch (System.OutOfMemoryException ex)
{
if (retry < 0)
{
throw new Exception(System.Reflection.Assembly.GetEntryAssembly().GetName().Name + ".StringCompression.DecompressString", ex);
}
System.Threading.Thread.Sleep(10);
}
}
}
}
finally
{
ByteCompression.Recycle(buf);
}
}
catch (Exception ex)
{
STEM.Sys.EventLog.WriteEntry(System.Reflection.Assembly.GetEntryAssembly().GetName().Name + ".StringCompression.DecompressString", ex.ToString(), STEM.Sys.EventLog.EventLogEntryType.Error);
throw;
}
}