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Streamlined MatchesFile implementation

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Michael Becker 2014-12-17 23:02:27 -05:00
parent 85479ce824
commit 970dfac4d1
1 changed files with 35 additions and 44 deletions
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79
CSharp/Libraries/UniversalEditor.Core/DataFormatFilter.cs
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@ -257,56 +257,47 @@ namespace UniversalEditor
}
public bool MatchesFile(Accessor FileData)
{
switch (mvarHintComparison)
// first determine if our file name matches any of the filters
string fileName = FileData.GetFileName();
for (int i = 0; i < mvarFileNameFilters.Count; i++)
{
case DataFormatHintComparison.Always:
if (fileName.Match(mvarFileNameFilters[i])) return true;
}
// then determine if the magic bytes match
for (int i = 0; i < mvarMagicBytes.Count; i++)
{
byte?[] bytes = mvarMagicBytes[i];
if ((FileData.Position + bytes.Length) <= FileData.Length)
{
return true;
}
case DataFormatHintComparison.MagicOnly:
case DataFormatHintComparison.FilterThenMagic:
case DataFormatHintComparison.MagicThenFilter:
{
for (int i = 0; i < mvarMagicBytes.Count; i++)
bool ret = true;
byte[] cmp = new byte[bytes.Length];
long offset = FileData.Position;
if (i < mvarMagicByteOffsets.Length)
{
byte?[] bytes = mvarMagicBytes[i];
if ((FileData.Position + bytes.Length) <= FileData.Length)
if (mvarMagicByteOffsets[i] < 0)
{
bool ret = true;
byte[] cmp = new byte[bytes.Length];
long offset = FileData.Position;
if (i < mvarMagicByteOffsets.Length)
{
if (mvarMagicByteOffsets[i] < 0)
{
FileData.Seek(mvarMagicByteOffsets[i], SeekOrigin.End);
}
else
{
FileData.Seek(mvarMagicByteOffsets[i], SeekOrigin.Begin);
}
}
FileData.Reader.Read(cmp, 0, cmp.Length);
FileData.Position = offset;
for (int j = 0; j < bytes.Length; j++)
{
if (bytes[j] == null) continue;
if (bytes[j] != cmp[j])
{
ret = false;
break;
}
}
if (ret) return true;
FileData.Seek(mvarMagicByteOffsets[i], SeekOrigin.End);
}
else
{
FileData.Seek(mvarMagicByteOffsets[i], SeekOrigin.Begin);
}
}
return false;
}
case DataFormatHintComparison.None:
{
return false;
FileData.Reader.Read(cmp, 0, cmp.Length);
FileData.Position = offset;
for (int j = 0; j < bytes.Length; j++)
{
if (bytes[j] == null) continue;
if (bytes[j] != cmp[j])
{
ret = false;
break;
}
}
if (ret) return true;
}
}
return false;