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strings record encoding used to create them.

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in order to recreate the valid bytes for use in decryption it is necessary to know which encoding was used to read a string token. this is because utf16-be encoding has a byte-order marker which should be included in the resulting bytes.
This commit is contained in:
Eliot Jones
2020-01-26 17:07:58 +00:00
parent 693a3d5958
commit 6cf257a331
5 changed files with 345 additions and 4 deletions
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275
src/UglyToad.PdfPig.Core/OtherEncodings.cs
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@@ -57,5 +57,280 @@
return Iso88591.GetString(bytes);
}
/// <summary>
/// The encoding for strings in a PDF file which encodes all of the ISO Latin 1 character set.
/// </summary>
public static class PdfDocEncoding
{
private static readonly IReadOnlyDictionary<byte, char> CodeToUnicode = new Dictionary<byte, char>
{
{0, '\u0000'},
{1, '\u0001'},
{2, '\u0002'},
{3, '\u0003'},
{4, '\u0004'},
{5, '\u0005'},
{6, '\u0006'},
{7, '\u0007'},
{8, '\u0008'},
{9, '\u0009'},
{10, '\u000A'},
{11, '\u000B'},
{12, '\u000C'},
{13, '\u000D'},
{14, '\u000E'},
{15, '\u000F'},
{16, '\u0010'},
{17, '\u0011'},
{18, '\u0012'},
{19, '\u0013'},
{20, '\u0014'},
{21, '\u0015'},
{22, '\u0017'},
{23, '\u0017'},
{24, '\u02D8'},
{25, '\u02C7'},
{26, '\u02C6'},
{27, '\u02D9'},
{28, '\u02DD'},
{29, '\u02DB'},
{30, '\u02DA'},
{31, '\u02DC'},
{32, '\u0020'},
{33, '\u0021'},
{34, '\u0022'},
{35, '\u0023'},
{36, '\u0024'},
{37, '\u0025'},
{38, '\u0026'},
{39, '\u0027'},
{40, '\u0028'},
{41, '\u0029'},
{42, '\u002A'},
{43, '\u002B'},
{44, '\u002C'},
{45, '\u002D'},
{46, '\u002E'},
{47, '\u002F'},
{48, '\u0030'},
{49, '\u0031'},
{50, '\u0032'},
{51, '\u0033'},
{52, '\u0034'},
{53, '\u0035'},
{54, '\u0036'},
{55, '\u0037'},
{56, '\u0038'},
{57, '\u0039'},
{58, '\u003A'},
{59, '\u003B'},
{60, '\u003C'},
{61, '\u003D'},
{62, '\u003E'},
{63, '\u003F'},
{64, '\u0040'},
{65, '\u0041'},
{66, '\u0042'},
{67, '\u0043'},
{68, '\u0044'},
{69, '\u0045'},
{70, '\u0046'},
{71, '\u0047'},
{72, '\u0048'},
{73, '\u0049'},
{74, '\u004A'},
{75, '\u004B'},
{76, '\u004C'},
{77, '\u004D'},
{78, '\u004E'},
{79, '\u004F'},
{80, '\u0050'},
{81, '\u0051'},
{82, '\u0052'},
{83, '\u0053'},
{84, '\u0054'},
{85, '\u0055'},
{86, '\u0056'},
{87, '\u0057'},
{88, '\u0058'},
{89, '\u0059'},
{90, '\u005A'},
{91, '\u005B'},
{92, '\u005C'},
{93, '\u005D'},
{94, '\u005E'},
{95, '\u005F'},
{96, '\u0060'},
{97, '\u0061'},
{98, '\u0062'},
{99, '\u0063'},
{100, '\u0064'},
{101, '\u0065'},
{102, '\u0066'},
{103, '\u0067'},
{104, '\u0068'},
{105, '\u0069'},
{106, '\u006A'},
{107, '\u006B'},
{108, '\u006C'},
{109, '\u006D'},
{110, '\u006E'},
{111, '\u006F'},
{112, '\u0070'},
{113, '\u0071'},
{114, '\u0072'},
{115, '\u0073'},
{116, '\u0074'},
{117, '\u0075'},
{118, '\u0076'},
{119, '\u0077'},
{120, '\u0078'},
{121, '\u0079'},
{122, '\u007A'},
{123, '\u007B'},
{124, '\u007C'},
{125, '\u007D'},
{126, '\u007E'},
{128, '\u2022'},
{129, '\u2020'},
{130, '\u2021'},
{131, '\u2026'},
{132, '\u2014'},
{133, '\u2013'},
{134, '\u0192'},
{135, '\u2044'},
{136, '\u2039'},
{137, '\u203A'},
{138, '\u2212'},
{139, '\u2030'},
{140, '\u201E'},
{141, '\u201C'},
{142, '\u201D'},
{143, '\u2018'},
{144, '\u2019'},
{145, '\u201A'},
{146, '\u2122'},
{147, '\uFB01'},
{148, '\uFB02'},
{149, '\u0141'},
{150, '\u0152'},
{151, '\u0160'},
{152, '\u0178'},
{153, '\u017D'},
{154, '\u0131'},
{155, '\u0142'},
{156, '\u0153'},
{157, '\u0161'},
{158, '\u017E'},
{160, '\u20AC'},
{161, '\u00A1'},
{162, '\u00A2'},
{163, '\u00A3'},
{164, '\u00A4'},
{165, '\u00A5'},
{166, '\u00A6'},
{167, '\u00A7'},
{168, '\u00A8'},
{169, '\u00A9'},
{170, '\u00AA'},
{171, '\u00AB'},
{172, '\u00AC'},
{174, '\u00AE'},
{175, '\u00AF'},
{176, '\u00B0'},
{177, '\u00B1'},
{178, '\u00B2'},
{179, '\u00B3'},
{180, '\u00B4'},
{181, '\u00B5'},
{182, '\u00B6'},
{183, '\u00B7'},
{184, '\u00B8'},
{185, '\u00B9'},
{186, '\u00BA'},
{187, '\u00BB'},
{188, '\u00BC'},
{189, '\u00BD'},
{190, '\u00BE'},
{191, '\u00BF'},
{192, '\u00C0'},
{193, '\u00C1'},
{194, '\u00C2'},
{195, '\u00C3'},
{196, '\u00C4'},
{197, '\u00C5'},
{198, '\u00C6'},
{199, '\u00C7'},
{200, '\u00C8'},
{201, '\u00C9'},
{202, '\u00CA'},
{203, '\u00CB'},
{204, '\u00CC'},
{205, '\u00CD'},
{206, '\u00CE'},
{207, '\u00CF'},
{208, '\u00D0'},
{209, '\u00D1'},
{210, '\u00D2'},
{211, '\u00D3'},
{212, '\u00D4'},
{213, '\u00D5'},
{214, '\u00D6'},
{215, '\u00D7'},
{216, '\u00D8'},
{217, '\u00D9'},
{218, '\u00DA'},
{219, '\u00DB'},
{220, '\u00DC'},
{221, '\u00DD'},
{222, '\u00DE'},
{223, '\u00DF'},
{224, '\u00E0'},
{225, '\u00E1'},
{226, '\u00E2'},
{227, '\u00E3'},
{228, '\u00E4'},
{229, '\u00E5'},
{230, '\u00E6'},
{231, '\u00E7'},
{232, '\u00E8'},
{233, '\u00E9'},
{234, '\u00EA'},
{235, '\u00EB'},
{236, '\u00EC'},
{237, '\u00ED'},
{238, '\u00EE'},
{239, '\u00EF'},
{240, '\u00F0'},
{241, '\u00F1'},
{242, '\u00F2'},
{243, '\u00F3'},
{244, '\u00F4'},
{245, '\u00F5'},
{246, '\u00F6'},
{247, '\u00F7'},
{248, '\u00F8'},
{249, '\u00F9'},
{250, '\u00FA'},
{251, '\u00FB'},
{252, '\u00FC'},
{253, '\u00FD'},
{254, '\u00FE'},
{255, '\u00FF'},
// Undefined codes follow.
{127, '\uFFFD'},
{159, '\uFFFD'},
{173, '\uFFFD'}
};
/// <summary>
/// Whether the PDF Doc Encoding contains a corresponding character.
/// </summary>
public static bool ContainsChar(char c)
{
return CodeToUnicode.Any(x => x.Value == c);
}
}
}
}