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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2025 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.Text;
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[] g_vTextExts = new string[] {
".asc", ".bat", ".c", ".cpp", ".css", ".csv", ".h", ".hpp",
".js", ".ps1", ".tab", ".tsv", ".txt"
};
private static readonly string[] g_vRichTextExts = new string[] {
".rtf"
};
private static readonly string[] g_vImageExts = new string[] {
".bmp", ".emf", ".exif", ".gif", ".ico", ".jpe", ".jpeg",
".jpg", ".png", ".tif", ".tiff", ".wmf"
};
private static readonly string[] g_vWebExts = new string[] {
".htm", ".html"
// The following types can be displayed by Internet Explorer,
// but not by the WebBrowser control
// ".mht", ".xml", ".xsl", ".xslt"
};
private static bool UrlHasExt(string strUrl, string[] vExts)
{
Debug.Assert(strUrl.Trim().ToLowerInvariant() == strUrl);
foreach(string strExt in vExts)
{
Debug.Assert(strExt.StartsWith("."));
Debug.Assert(strExt.Trim().ToLower() == strExt);
if(strUrl.EndsWith(strExt, StringComparison.Ordinal))
return true;
}
return false;
}
public static BinaryDataClass ClassifyUrl(string strUrl)
{
if(strUrl == null) { Debug.Assert(false); throw new ArgumentNullException("strUrl"); }
string str = strUrl.Trim().ToLowerInvariant();
if(UrlHasExt(str, g_vTextExts))
return BinaryDataClass.Text;
if(UrlHasExt(str, g_vRichTextExts))
return BinaryDataClass.RichText;
if(UrlHasExt(str, g_vImageExts))
return BinaryDataClass.Image;
if(UrlHasExt(str, g_vWebExts))
return BinaryDataClass.WebDocument;
return BinaryDataClass.Unknown;
}
public static BinaryDataClass ClassifyData(byte[] pbData)
{
if(pbData == null) { Debug.Assert(false); 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)
{
if(pbData == null) { Debug.Assert(false); 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 null 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 null 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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