void applyDiffToFile(string deltaPath, string relativeFilePath, string workingDirectory)
{
var inputFile = Path.Combine(deltaPath, relativeFilePath);
var finalTarget = Path.Combine(workingDirectory, Regex.Replace(relativeFilePath, @".diff$", ""));
var tempTargetFile = Path.GetTempFileName();
// NB: Zero-length diffs indicate the file hasn't actually changed
if (new FileInfo(inputFile).Length == 0)
{
this.Log().Info("{0} exists unchanged, skipping", relativeFilePath);
return;
}
if (relativeFilePath.EndsWith(".diff", StringComparison.InvariantCultureIgnoreCase))
{
using (var of = File.OpenWrite(tempTargetFile))
using (var inf = File.OpenRead(finalTarget)) {
this.Log().Info("Applying Diff to {0}", relativeFilePath);
BinaryPatchUtility.Apply(inf, () => File.OpenRead(inputFile), of);
}
try {
verifyPatchedFile(relativeFilePath, inputFile, tempTargetFile);
} catch (Exception) {
File.Delete(tempTargetFile);
throw;
}
}
else
{
using (var of = File.OpenWrite(tempTargetFile))
using (var inf = File.OpenRead(inputFile)) {
this.Log().Info("Adding new file: {0}", relativeFilePath);
inf.CopyTo(of);
}
}
if (File.Exists(finalTarget))
{
File.Delete(finalTarget);
}
var targetPath = Directory.GetParent(finalTarget);
if (!targetPath.Exists)
{
targetPath.Create();
}
File.Move(tempTargetFile, finalTarget);
}
void createDeltaForSingleFile(FileInfo targetFile, DirectoryInfo workingDirectory, Dictionary <string, string> baseFileListing)
{
// NB: There are three cases here that we'll handle:
//
// 1. Exists only in new => leave it alone, we'll use it directly.
// 2. Exists in both old and new => write a dummy file so we know
// to keep it.
// 3. Exists in old but changed in new => create a delta file
//
// The fourth case of "Exists only in old => delete it in new"
// is handled when we apply the delta package
var relativePath = targetFile.FullName.Replace(workingDirectory.FullName, "");
if (!baseFileListing.ContainsKey(relativePath))
{
this.Log().Info("{0} not found in base package, marking as new", relativePath);
return;
}
var oldData = File.ReadAllBytes(baseFileListing[relativePath]);
var newData = File.ReadAllBytes(targetFile.FullName);
if (bytesAreIdentical(oldData, newData))
{
this.Log().Info("{0} hasn't changed, writing dummy file", relativePath);
File.Create(targetFile.FullName + ".diff").Dispose();
File.Create(targetFile.FullName + ".shasum").Dispose();
targetFile.Delete();
return;
}
this.Log().Info("Delta patching {0} => {1}", baseFileListing[relativePath], targetFile.FullName);
using (var of = File.Create(targetFile.FullName + ".diff")) {
BinaryPatchUtility.Create(oldData, newData, of);
var rl = ReleaseEntry.GenerateFromFile(new MemoryStream(newData), targetFile.Name + ".shasum");
File.WriteAllText(targetFile.FullName + ".shasum", rl.EntryAsString, Encoding.UTF8);
targetFile.Delete();
}
}