private static void GetFileLines(string fileNameA, string fileNameB,
out IList <string> a, out IList <string> b,
out int leadingCharactersToIgnore,
TextBinaryDiffArgs args,
IDiffProgress progress)
{
a = null;
b = null;
leadingCharactersToIgnore = 0;
CompareType compareType = args.CompareType;
if (compareType == CompareType.Binary ||
(args.IsAuto && (DiffUtility.IsBinaryFile(fileNameA) || DiffUtility.IsBinaryFile(fileNameB))))
{
using (FileStream fileA = File.OpenRead(fileNameA))
using (FileStream fileB = File.OpenRead(fileNameB))
{
BinaryDiff diff = new BinaryDiff
{
FootprintLength = args.BinaryFootprintLength
};
AddCopyCollection addCopy = diff.Execute(fileA, fileB);
BinaryDiffLines lines = new BinaryDiffLines(fileA, addCopy, args.BinaryFootprintLength);
a = lines.BaseLines;
b = lines.VersionLines;
leadingCharactersToIgnore = BinaryDiffLines.PrefixLength;
}
}
if (compareType == CompareType.Xml || (args.IsAuto && (a == null || b == null)))
{
a = TryGetXmlLines(DiffUtility.GetXmlTextLines, fileNameA, fileNameA, !args.IsAuto, args, progress);
// If A failed to parse with Auto, then there's no reason to try B.
if (a != null)
{
b = TryGetXmlLines(DiffUtility.GetXmlTextLines, fileNameB, fileNameB, !args.IsAuto, args, progress);
}
// If we get here and the compare type was XML, then both
// inputs parsed correctly, and both lists should be non-null.
// If we get here and the compare type was Auto, then one
// or both lists may be null, so we'll fallthrough to the text
// handling logic.
}
if (a == null || b == null)
{
a = DiffUtility.GetFileTextLines(fileNameA, progress);
b = DiffUtility.GetFileTextLines(fileNameB, progress);
}
}