public string WriteSharedObject(string directory, string sharedFileName, string extension, string objectId, string readFileName, BinaryXmlTypeMap typeMap, IBinaryXmlElement obj)
{
string file = readFileName;
if (file == null)
{
int count = 1;
string name = sharedFileName + "_" + Util.GetStringHashCode(objectId).ToString("x");
file = Path.Combine(directory, name + extension);
while (Exists(file))
{
count++;
file = Path.Combine(directory, name + "_" + count + extension);
}
}
using (Stream s = Create(file)) {
BinaryXmlWriter writer = new BinaryXmlWriter(s, typeMap);
writer.WriteBeginElement("File");
writer.WriteValue("id", objectId);
writer.WriteValue("data", obj);
writer.WriteEndElement();
}
return(file);
}
object ReadSharedObject(string directory, string sharedFileName, string extension, string objectId, BinaryXmlTypeMap typeMap, bool checkOnly, out string fileName)
{
string name = sharedFileName + "_" + Util.GetStringHashCode(objectId).ToString("x");
string file = Path.Combine(directory, name + extension);
object result;
if (OpenFileForPath(file, objectId, typeMap, checkOnly, out result))
{
fileName = file;
return(result);
}
// The file is not the one we expected. There has been a name colision
foreach (string f in GetDirectoryFiles(directory, name + "*" + extension))
{
if (f != file && OpenFileForPath(f, objectId, typeMap, checkOnly, out result))
{
fileName = f;
return(result);
}
}
// File not found
fileName = null;
return(null);
}
string GetFileKey(string directory, string sharedFileName, string objectId)
{
int avlen = System.Math.Max(240 - directory.Length, 10);
string name = sharedFileName + "_" + Util.GetStringHashCode(objectId).ToString("x");
if (name.Length > avlen)
{
return(name.Substring(name.Length - avlen));
}
else
{
return(name);
}
}
string GetFileKey(string directory, string sharedFileName, string objectId)
{
// We have two magic numbers here. 240 is a "room to spare" number based on 255,
// the Windows MAX_PATH length for the full path of a file on disk. Then 130 is
// a "room to spare" number based on 143-"ish", the maximum filename length for
// files stored on eCryptFS on Linux. 240 relates to the complete path
// (including the directory structure), and 130 is just the filename, so we pick
// whichever is the smaller of those two numbers when truncating.
int avlen = System.Math.Min(System.Math.Max(240 - directory.Length, 10), 130);
string name = sharedFileName + "_" + Util.GetStringHashCode(objectId).ToString("x");
if (name.Length > avlen)
{
return(name.Substring(name.Length - avlen));
}
else
{
return(name);
}
}