ClemensFischer/XAML-Map-Control
1
0
Fork 0
mirror of https://github.com/ClemensFischer/XAML-Map-Control.git synced 2026-04-05 06:26:41 +00:00
Code Issues Projects Releases Packages Wiki Activity

Unified ImageFileCache implementations

Browse source
This commit is contained in:
Clemens 2021-06-30 17:56:02 +02:00
parent 8cb20f0544
commit f9347edf19
5 changed files with 92 additions and 118 deletions
Download patch file Download diff file Expand all files Collapse all files

46
MapControl/UWP/ImageFileCache.UWP.cs
View file

@ -12,23 +12,8 @@ using Windows.Storage.Streams;
namespace MapControl.Caching
{
public class ImageFileCache : IImageCache
public partial class ImageFileCache : IImageCache
{
private const string expiresTag = "EXPIRES:";
private readonly string rootDirectory;
public ImageFileCache(string directory)
{
if (string.IsNullOrEmpty(directory))
{
throw new ArgumentException("The directory argument must not be null or empty.", nameof(directory));
}
rootDirectory = directory;
Debug.WriteLine("Created ImageFileCache in " + rootDirectory);
}
public async Task<ImageCacheItem> GetAsync(string key)
{
ImageCacheItem imageCacheItem = null;
@ -39,7 +24,7 @@ namespace MapControl.Caching
if (path != null && File.Exists(path))
{
var buffer = await File.ReadAllBytesAsync(path);
var expiration = GetExpiration(ref buffer);
var expiration = ReadExpiration(ref buffer);
imageCacheItem = new ImageCacheItem
{
@ -83,32 +68,5 @@ namespace MapControl.Caching
}
}
}
private string GetPath(string key)
{
try
{
return Path.Combine(rootDirectory, Path.Combine(key.Split('/', ':', ';', ',')));
}
catch (Exception ex)
{
Debug.WriteLine("ImageFileCache: Invalid key {0}/{1}: {2}", rootDirectory, key, ex.Message);
}
return null;
}
private static DateTime GetExpiration(ref byte[] buffer)
{
DateTime expiration = DateTime.Today;
if (buffer.Length > 16 && Encoding.ASCII.GetString(buffer, buffer.Length - 16, 8) == expiresTag)
{
expiration = new DateTime(BitConverter.ToInt64(buffer, buffer.Length - 8), DateTimeKind.Utc);
Array.Resize(ref buffer, buffer.Length - 16);
}
return expiration;
}
}
}

3
MapControl/UWP/MapControl.UWP.csproj
View file

@ -77,6 +77,9 @@
<Compile Include="..\Shared\HyperlinkText.cs">
<Link>HyperlinkText.cs</Link>
</Compile>
<Compile Include="..\Shared\ImageFileCache.cs">
<Link>ImageFileCache.cs</Link>
</Compile>
<Compile Include="..\Shared\ImageLoader.cs">
<Link>ImageLoader.cs</Link>
</Compile>