protected override async Task <byte[]> LoadHgtDataFromFileAsync(HgtCellCoords coords, string filePath)
{
using (var zipArchive = ZipFile.OpenRead(filePath))
{
var entry = zipArchive.Entries.Single();
long length = entry.Length;
if (!HgtUtils.IsDataLengthValid(length))
{
throw new HgtFileInvalidException(coords, string.Format("Invalid length - {0} bytes", length));
}
using (var zipStream = entry.Open())
{
return(await LoadHgtDataFromStreamAsync(zipStream));
}
}
}
public IHgtDataCell GetCellFor(HgtCellCoords coords)
{
var path = _pathResolver.FindFilePath(coords);
FileStream file = null;
try
{
int fileSize = (int)new FileInfo(path).Length;
file = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.Read);
return(new HgtDataCellInFile(file, HgtUtils.PointsPerCellFromDataLength(fileSize), coords));
}
catch (Exception)
{
if (file != null)
{
file.Dispose();
}
throw;
}
}
public async Task <IHgtDataCell> GetCellForAsync(HgtCellCoords coords)
{
var data = await _loader.LoadFromFileAsync(coords);
return(new HgtDataCellInMemory(data, HgtUtils.PointsPerCellFromDataLength(data.Length), coords));
}
public IHgtDataCell GetCellFor(HgtCellCoords coords)
{
var data = _loader.LoadFromFile(coords);
return(new HgtDataCellInMemory(data, HgtUtils.PointsPerCellFromDataLength(data.Length), coords));
}