public class GZipLogger
{
/// <summary>
/// GZip起始位元
/// </summary>
private static byte[] m_byGzHeader = new byte[] {
31, 139, 8, 0, 0, 0, 0, 0, 4, 0, 237, 189, 7, 96, 28, 73, 150, 37, 38, 47, 109,
202, 123, 127, 74, 245, 74, 215, 224, 116, 161, 8, 128, 96, 19, 36, 216, 144, 64,
16, 236, 193, 136, 205, 230, 146, 236, 29, 105, 71, 35, 41, 171, 42, 129, 202, 101,
86, 101, 93, 102, 22, 64, 204, 237, 157, 188, 247, 222, 123, 239, 189, 247, 222,
123,239, 189, 247, 186, 59, 157, 78, 39, 247, 223, 255, 63, 92, 102, 100, 1, 108,
246, 206, 74, 218, 201, 158, 33, 128, 170, 200, 31, 63, 126, 124, 31, 63, 34
};
/// <summary>
/// 記錄Log
/// </summary>
/// <param name="strLogFileName">檔案位置</param>
/// <param name="strMessage">訊息</param>
public static void Log(string strLogFileName, string strMessage)
{
FileStream fsFileInput = new FileStream(strLogFileName, FileMode.Append);
GZipStream gzsFileInput = new GZipStream(fsFileInput, CompressionMode.Compress);
byte[] byBuffer = Encoding.UTF8.GetBytes(strMessage);
gzsFileInput.Write(byBuffer, 0, byBuffer.Length);
gzsFileInput.Close();
fsFileInput.Close();
}
/// <summary>
/// 讀取Log
/// </summary>
/// <param name="strLogFileName">Log檔位置</param>
/// <returns>Log內容</returns>
public static string Read(string strLogFileName)
{
if (String.IsNullOrEmpty(strLogFileName))
throw new ArgumentException("strLogFileName is null or empty.", "strLogFileName");
StringBuilder sbTemp = new StringBuilder();
#region 讀檔
FileStream fsInputFile = new FileStream(strLogFileName, FileMode.Open);
MemoryStream msInputFile = new MemoryStream();
int iReaded;
byte[] byBuffer = new byte[512];
while ((iReaded = fsInputFile.Read(byBuffer, 0, byBuffer.Length)) > 0)
{
msInputFile.Write(byBuffer, 0, iReaded);
}
fsInputFile.Close();
msInputFile.Close();
#endregion
List<byte[]> lsSection = SplitBytes(msInputFile.ToArray());
foreach (byte[] bySection in lsSection)
{
sbTemp.Append(UnZip(bySection));
}
return sbTemp.ToString();
}
/// <summary>
/// 還原壓縮的GZip位元陣列為字串
/// </summary>
/// <param name="byBuffer">已壓縮的GZip位元陣列</param>
/// <returns>還原的字串</returns>
private static string UnZip(byte[] byBuffer)
{
if (byBuffer == null || byBuffer.Length == 0)
throw new ArgumentException("byBuffer is null or empty.", "byBuffer");
MemoryStream msInput = new MemoryStream(byBuffer);
GZipStream gzsInput = new GZipStream(msInput, CompressionMode.Decompress);
StreamReader srInput = new StreamReader(gzsInput);
string strContent = srInput.ReadToEnd();
srInput.Close();
gzsInput.Close();
msInput.Close();
return strContent;
}
/// <summary>
/// 分割GZip位元陣列
/// </summary>
/// <param name="byBuffer">來源位元陣列</param>
/// <returns>分割結果</returns>
private static List<byte[]> SplitBytes(byte[] byBuffer)
{
if (byBuffer == null || byBuffer.Length == 0)
throw new ArgumentException("byBuffer is null or empty.", "byBuffer");
#region 記錄每個區段起始點
List<int> lsBreaks = new List<int>();
int iStartIndex = 0;
while ((iStartIndex = IndexOf(byBuffer, iStartIndex)) > -1)
{
lsBreaks.Add(iStartIndex);
iStartIndex++;
}
lsBreaks.Add(byBuffer.Length);
#endregion
#region 分割
List<byte[]> lsSection = new List<byte[]>();
for (int i = 0; i < lsBreaks.Count - 1; i++)
{
int iArrayLength = lsBreaks[i + 1] - lsBreaks[i];
byte[] byTemp = new byte[iArrayLength];
Array.Copy(byBuffer, lsBreaks[i], byTemp, 0, byTemp.Length);
lsSection.Add(byTemp);
}
#endregion
return lsSection;
}
/// <summary>
/// 傳回下一個GZip位元陣列的起始位置
/// </summary>
/// <param name="byBuffer">來源位元陣列</param>
/// <param name="iStartIndex">起始位置，若找不到則傳回-1</param>
/// <returns></returns>
private static int IndexOf(byte[] byBuffer, int iStartIndex)
{
if (byBuffer == null || byBuffer.Length == 0)
throw new ArgumentException("byBuffer is null or empty.", "byBuffer");
if (iStartIndex > -1 && (iStartIndex + m_byGzHeader.Length < byBuffer.Length))
{
for (int i = iStartIndex; i < byBuffer.Length; i++)
{
// 起始位元相同, 且剩餘長度大於GZip標頭時
if (byBuffer[i] == m_byGzHeader[0] && byBuffer.Length - i - 1 >= m_byGzHeader.Length)
{
#region 比對標頭
byte[] temp = new byte[m_byGzHeader.Length];
Array.Copy(byBuffer, i, temp, 0, temp.Length);
if (CompareHeader(temp))
{
return i;
}
#endregion
}
}
}
return -1;
}
/// <summary>
/// 比對起始的GZip位元
/// </summary>
/// <param name="byBuffer">來源位元陣列</param>
/// <returns>位元陣列相同為True, 反之為False</returns>
private static bool CompareHeader(byte[] byBuffer)
{
if (byBuffer == null || byBuffer.Length == 0)
throw new ArgumentException("byBuffer is null or empty.", "byBuffer");
if (byBuffer.Length != m_byGzHeader.Length) return false;
for (int i = 0; i < byBuffer.Length; i++)
{
if (byBuffer[i] != m_byGzHeader[i]) return false;
}
return true;
}
}
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