protected override PatchEntry OnMatch(Byte[] data, Int32 i, SearchCriteria criteria)
{
PatchEntry entry = new PatchEntry();
entry.Status = PatchCurrentStatus.Unknown;
if (data[i + criteria.MagicIndex] == 0x48 &&
data[i + criteria.MagicIndex + 1] == 0x31)
{
entry.Status = PatchCurrentStatus.Yes;
}
else
if (data[i + criteria.MagicIndex] == 0x48 &&
data[i + criteria.MagicIndex + 1] == 0x81)
{
entry.Status = PatchCurrentStatus.No;
}
if (entry.Status != PatchCurrentStatus.Unknown)
{
entry.Offset = criteria.SearchBegin + i + criteria.MagicIndex;
entry.Bytes = criteria.PatchBytes;
}
return(entry);
}
protected Patch Search(SearchCriteria criteria)
{
if (criteria.SearchEnd >= File.Length)
{
criteria.SearchEnd = File.Length;
}
Byte[] data;
using (FileStream fs = new FileStream(File.FullName, FileMode.Open, FileAccess.Read, FileShare.Read, 0x400))
using (BinaryReader rdr = new BinaryReader(fs)) {
fs.Seek(criteria.SearchBegin, SeekOrigin.Begin);
int length = (int)(criteria.SearchEnd - criteria.SearchBegin);
data = rdr.ReadBytes(length);
}
Patch ret = new Patch(File);
List <PatchEntry> entries = new List <PatchEntry>();
/////////////////////////////////
// Do the search
for (int i = 0; i < data.Length - 64; i++)
{
if (
data[i] == criteria.SignBytes[0] &&
data[i + criteria.SignIndexen[1]] == criteria.SignBytes[1])
{
///////////////////////////////////////////////////////////////
// if the first 2 match, try the rest
Boolean matched = true;
for (int j = 2; j < criteria.SignBytes.Length; j++)
{
if (data[i + criteria.SignIndexen[j]] != criteria.SignBytes[j])
{
matched = false;
break;
}
}
if (matched)
{
// let the subclasses take it from here
PatchEntry entry = OnMatch(data, i, criteria);
if (entry != null)
{
entries.Add(entry);
}
}
} //if
} //for
ret.Entries = entries.ToArray();
return(ret);
}
protected override PatchEntry OnMatch(Byte[] data, Int32 i, SearchCriteria criteria)
{
PatchEntry entry = new PatchEntry();
entry.Status = PatchCurrentStatus.Unknown;
// Pre-Win7 M1
if (data[i + 33] == 0xF6 &&
data[i + 34] == 0xD8)
{
if (data[i + criteria.MagicIndex] == 0x33 &&
data[i + criteria.MagicIndex + 1] == 0xC0)
{
entry.Status = PatchCurrentStatus.Yes;
}
else
if (data[i + criteria.MagicIndex] == 0x81 &&
data[i + criteria.MagicIndex + 1] == 0xEC)
{
entry.Status = PatchCurrentStatus.No;
}
}
else
if (data[i + 33] == 0x0F &&
data[i + 36] == 0xF7)
{
if (data[i + criteria.MagicIndex] == 0x33 &&
data[i + criteria.MagicIndex + 1] == 0xC0)
{
entry.Status = PatchCurrentStatus.Yes;
}
else
if (data[i + criteria.MagicIndex] == 0x81 &&
data[i + criteria.MagicIndex + 1] == 0xEC)
{
entry.Status = PatchCurrentStatus.No;
}
}
if (entry.Status != PatchCurrentStatus.Unknown)
{
entry.Offset = criteria.SearchBegin + i + criteria.MagicIndex;
entry.Bytes = criteria.PatchBytes;
}
return(entry);
}
private void ApplyPatch(PatchEntry entry)
{
// sanity checking
if (entry.Offset >= File.Length)
{
throw new InvalidDataException("offset out of range");
}
if (entry.Offset == -1)
{
throw new InvalidDataException("offset undefined");
}
_fs.Seek(entry.Offset, SeekOrigin.Begin);
_fs.Write(entry.Bytes, 0, entry.Bytes.Length);
}
protected override PatchEntry OnMatch(Byte[] data, Int32 i, SearchCriteria criteria)
{
PatchEntry entry = new PatchEntry();
entry.Status = PatchCurrentStatus.Unknown;
if (data[i + criteria.MagicIndex] == 0x33 &&
data[i + 15] == 0xC3)
{
// this file is patched
entry.Status = PatchCurrentStatus.Yes;
}
else
if (data[i + criteria.MagicIndex] == 0x48 &&
data[i + criteria.MagicIndex + 1] == 0x81 &&
data[i + 15] == 0x48)
{
// then it isn't patch
entry.Status = PatchCurrentStatus.No;
}
else
if (data[i + criteria.MagicIndex] == 0x33)
{
entry.Status = PatchCurrentStatus.Unsure;
}
if (entry.Status != PatchCurrentStatus.Unknown)
{
entry.Offset = criteria.SearchBegin + i + criteria.MagicIndex;
entry.Bytes = criteria.PatchBytes;
}
return(entry);
}