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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Text;
using KeePass.Resources;
using KeePassLib.Security;
using KeePassLib.Utility;
namespace KeePass.Util
{
public enum BinaryDataClass
{
Unknown = 0,
Text,
RichText,
Image,
WebDocument
}
public static class BinaryDataClassifier
{
private static readonly string[] m_vTextExtensions = new string[] {
"txt", "csv", "c", "cpp", "h", "hpp", "css", "js", "bat",
"ps1"
};
private static readonly string[] m_vRichTextExtensions = new string[] {
"rtf"
};
private static readonly string[] m_vImageExtensions = new string[] {
"bmp", "emf", "exif", "gif", "ico", "jpeg", "jpe", "jpg",
"png", "tiff", "tif", "wmf"
};
private static readonly string[] m_vWebExtensions = new string[] {
"htm", "html"
// The following types can be displayed by Internet Explorer,
// but not by the WebBrowser control
// "mht", "xml", "xslt"
};
public static BinaryDataClass ClassifyUrl(string strUrl)
{
Debug.Assert(strUrl != null);
if(strUrl == null) throw new ArgumentNullException("strUrl");
string str = strUrl.Trim().ToLower();
foreach(string strTextExt in m_vTextExtensions)
{
if(str.EndsWith("." + strTextExt))
return BinaryDataClass.Text;
}
foreach(string strRichTextExt in m_vRichTextExtensions)
{
if(str.EndsWith("." + strRichTextExt))
return BinaryDataClass.RichText;
}
foreach(string strImageExt in m_vImageExtensions)
{
if(str.EndsWith("." + strImageExt))
return BinaryDataClass.Image;
}
foreach(string strWebExt in m_vWebExtensions)
{
if(str.EndsWith("." + strWebExt))
return BinaryDataClass.WebDocument;
}
return BinaryDataClass.Unknown;
}
public static BinaryDataClass ClassifyData(byte[] pbData)
{
Debug.Assert(pbData != null);
if(pbData == null) throw new ArgumentNullException("pbData");
try
{
Image img = GfxUtil.LoadImage(pbData);
if(img != null)
{
img.Dispose();
return BinaryDataClass.Image;
}
}
catch(Exception) { }
return BinaryDataClass.Unknown;
}
// Cf. other overload
public static BinaryDataClass Classify(string strUrl, byte[] pbData)
{
BinaryDataClass bdc = ClassifyUrl(strUrl);
if(bdc != BinaryDataClass.Unknown) return bdc;
return ClassifyData(pbData);
}
// Cf. other overload
public static BinaryDataClass Classify(string strUrl, ProtectedBinary pb)
{
BinaryDataClass bdc = ClassifyUrl(strUrl);
if(bdc != BinaryDataClass.Unknown) return bdc;
if(pb == null) throw new ArgumentNullException("pb");
byte[] pbData = pb.ReadData();
try { bdc = ClassifyData(pbData); }
finally { if(pb.IsProtected) MemUtil.ZeroByteArray(pbData); }
return bdc;
}
public static StrEncodingInfo GetStringEncoding(byte[] pbData,
out uint uStartOffset)
{
Debug.Assert(pbData != null);
if(pbData == null) throw new ArgumentNullException("pbData");
uStartOffset = 0;
List<StrEncodingInfo> lEncs = new List<StrEncodingInfo>(StrUtil.Encodings);
lEncs.Sort(BinaryDataClassifier.CompareBySigLengthRev);
foreach(StrEncodingInfo sei in lEncs)
{
byte[] pbSig = sei.StartSignature;
if((pbSig == null) || (pbSig.Length == 0)) continue;
if(pbSig.Length > pbData.Length) continue;
byte[] pbStart = MemUtil.Mid<byte>(pbData, 0, pbSig.Length);
if(MemUtil.ArraysEqual(pbStart, pbSig))
{
uStartOffset = (uint)pbSig.Length;
return sei;
}
}
if((pbData.Length % 4) == 0)
{
byte[] z3 = new byte[] { 0, 0, 0 };
int i = MemUtil.IndexOf<byte>(pbData, z3);
if((i >= 0) && (i < (pbData.Length - 4))) // Ignore last zero char
{
if((i % 4) == 0) return StrUtil.GetEncoding(StrEncodingType.Utf32BE);
if((i % 4) == 1) return StrUtil.GetEncoding(StrEncodingType.Utf32LE);
// Don't assume UTF-32 for other offsets
}
}
if((pbData.Length % 2) == 0)
{
int i = Array.IndexOf<byte>(pbData, 0);
if((i >= 0) && (i < (pbData.Length - 2))) // Ignore last zero char
{
if((i % 2) == 0) return StrUtil.GetEncoding(StrEncodingType.Utf16BE);
return StrUtil.GetEncoding(StrEncodingType.Utf16LE);
}
}
try
{
UTF8Encoding utf8Throw = new UTF8Encoding(false, true);
utf8Throw.GetString(pbData);
return StrUtil.GetEncoding(StrEncodingType.Utf8);
}
catch(Exception) { }
return StrUtil.GetEncoding(StrEncodingType.Default);
}
private static int CompareBySigLengthRev(StrEncodingInfo a, StrEncodingInfo b)
{
Debug.Assert((a != null) && (b != null));
int na = 0, nb = 0;
if((a != null) && (a.StartSignature != null))
na = a.StartSignature.Length;
if((b != null) && (b.StartSignature != null))
nb = b.StartSignature.Length;
return -(na.CompareTo(nb));
}
}
}
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