private void LoadEntries(bool checksum, IdentifyEntry identify)
{
using (var stream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
// Skip first 92 bytes
stream.Seek(SkipBytes, SeekOrigin.Begin);
// Read file
while (stream.Position < stream.Length)
{
// Read entry
var entry = UpdateEntry.Read(stream, checksum);
// Add to list
Entries.Add(entry);
// Identify
if (identify != null)
{
entry.Type = identify(entry);
}
// Skip file data
stream.Seek(entry.FileSize, SeekOrigin.Current);
// Read remainder
var remainder = Utilities.Remainder(entry);
if (remainder < Utilities.UintSize)
{
stream.Seek(remainder, SeekOrigin.Current);
}
}
}
}
private UpdateFile(string fileName, bool checksum, IdentifyEntry identify)
{
// Store filename
_fileName = fileName;
// Load entries
LoadEntries(checksum, identify);
}
/// <summary>
/// Open an existing update file
/// </summary>
/// <param name="fileName">Filename</param>
/// <param name="checksum">Verify header checksum</param>
/// <param name="identify">Delegate to identify an <see cref="UpdateEntry"/></param>
/// <returns><see cref="UpdateFile"/></returns>
public static UpdateFile Open(string fileName, bool checksum = true, IdentifyEntry identify = null)
{
return(new UpdateFile(fileName, checksum, identify));
}