public object Read(DataEntry entry)
{
if (fs == null)
{
fs = new FileStream(Path.Combine(WorkDirectory, $"{Header.FileName}._{entry.PageNum}"), FileMode.Open);
currentPage = entry.PageNum;
currentPos = fs.Position;
}
if (currentPage != entry.PageNum)
{
fs = new FileStream(Path.Combine(WorkDirectory, $"{Header.FileName}._{entry.PageNum}"), FileMode.Open);
currentPage = entry.PageNum;
currentPos = fs.Position;
}
if (currentPos != entry.Offset)
{
fs.Seek(entry.Offset, SeekOrigin.Begin);
currentPos = fs.Position;
}
byte[] data = new byte[entry.Length];
fs.Read(data, 0, entry.Length);
currentPos = fs.Position;
return(BinaryHelper.Deserialize(data));
}
private void initialize(string fileName)
{
if (!File.Exists(fileName))
{
throw new Exception($"不存在文件{fileName}");
}
if (string.IsNullOrEmpty(WorkDirectory))
{
WorkDirectory = System.Environment.GetEnvironmentVariable("TEMP");
}
if (string.IsNullOrEmpty(WorkDirectory))
{
string dir = Path.GetDirectoryName(fileName);
string file = Path.GetFileNameWithoutExtension(fileName);
WorkDirectory = Path.Combine(dir, file);
}
fileList = ZipHelper.UnZip(fileName, WorkDirectory);
string headerFile = Directory.GetFiles(WorkDirectory).Where(item => Path.GetFileName(item) == $"{Path.GetFileName(fileName)}.header").FirstOrDefault();
if (!File.Exists(headerFile))
{
throw new Exception($"未能在目录{WorkDirectory}找到.header文件");
}
Header = BinaryHelper.Deserialize <SummaryHeader>(File.ReadAllBytes(headerFile));
validateMD5();
}
private void initialize()
{
fileList = ZipHelper.UnZip(Path.Combine(WorkDirectory, FileEntry.FileName), WorkDirectory);
string headerFile = Directory.GetFiles(WorkDirectory).Where(item => Path.GetFileName(item) == $"{FileEntry.FileName}.header").FirstOrDefault();
if (!File.Exists(headerFile))
{
throw new Exception($"未能在目录{WorkDirectory}找到.header文件");
}
Header = BinaryHelper.Deserialize <PartialHeader>(File.ReadAllBytes(headerFile));
}