/// <summary>
/// Pre-condition: stream's file position must be at the beginning of a new section, marked with 4/8 byte ascii strings
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static SaveSection ParseSaveSection(FileStream stream, SimCity2000Save save)
{
byte[] name = new byte[4];
stream.Read(name, 0, 4);
string sectionName = BytesToString(name);
SaveSection newSection = null;
switch (sectionName)
{
case "MISC":
newSection = new MiscSection();
break;
case "ALTM":
newSection = new AltitudeSection();
break;
case "XTER":
newSection = new TerrainSection();
break;
case "XBLD":
newSection = new BuildingSection();
break;
case "XZON":
newSection = new ZoneSection();
((ZoneSection)newSection).MiscSection = save.MiscSection;
break;
default:
newSection = new SaveSection(sectionName);
break;
}
newSection.ParseSection(stream);
return newSection;
}
/// <summary>
/// Base implementation of diffing that just works on the raw data.
/// Eventually, each specializing class should understand the data and diff
/// actual fields
/// </summary>
/// <param name="oldSection"></param>
/// <returns></returns>
public virtual List<SectionDifference> Diff(SaveSection oldSection)
{
List<SectionDifference> diffs = new List<SectionDifference>();
if (RawData.Length != oldSection.RawData.Length)
{
diffs.Add(new SectionDifference("Length", oldSection.Length.ToString("x8"), Length.ToString("x8")));
}
for (int i = 0; i < RawData.Length; i++)
{
// Handle this data section being larger
if (i >= oldSection.RawData.Length)
{
diffs.Add(new SectionDifference((i + RawDataFileOffset).ToString("x8"), "", RawData[i].ToString("x2")));
}
else if (RawData[i] != oldSection.RawData[i])
{
diffs.Add(new SectionDifference((i + RawDataFileOffset).ToString("x8"), oldSection.RawData[i].ToString("x2"), RawData[i].ToString("x2")));
}
}
// Handle oldSection's data section being larger
if (oldSection.RawData.Length > RawData.Length)
{
for (int i = oldSection.RawData.Length; i < oldSection.RawData.Length; i++)
{
diffs.Add(new SectionDifference((i + oldSection.RawDataFileOffset).ToString("x2"), oldSection.RawData[i].ToString("x2"), ""));
}
}
return diffs;
}
public override List<SectionDifference> Diff(SaveSection oldSection)
{
var oldMiscSection = oldSection as MiscSection;
List<SectionDifference> diffs = new List<SectionDifference>();
for (int i = 0; i < Data.Count; i++)
{
if (Data[i] != oldMiscSection.Data[i])
{
diffs.Add(new SectionDifference(i.ToString(), oldMiscSection.Data[i].ToString(), Data[i].ToString()));
}
}
return diffs;
}
public override List<SectionDifference> Diff(SaveSection oldSection)
{
AltitudeSection oldAltitudeSection = oldSection as AltitudeSection;
List<SectionDifference> sds = new List<SectionDifference>();
for (int i = 0; i < 128; i++)
{
for (int j = 0; j < 128; j++)
{
if (!oldAltitudeSection.AltitudeData[i, j].Equals(AltitudeData[i, j]))
{
SectionDifference sd = new SectionDifference(j.ToString() + ", " + i.ToString(), oldAltitudeSection.AltitudeData[i, j].Altitude.ToString() + ", Water: " + oldAltitudeSection.AltitudeData[i, j].WaterCovered.ToString(), AltitudeData[i, j].Altitude.ToString() + ", Water: " + AltitudeData[i, j].WaterCovered.ToString());
sds.Add(sd);
}
}
}
return sds;
}
