Skip to content

Move supported definitions to separate file #34

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
detilium merged 1 commit into from
Apr 15, 2026
Merged

Move supported definitions to separate file #34

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion src/ByteGuard.FileValidator/Configuration/ConfigurationValidator.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ public static void ThrowIfInvalid(FileValidatorConfiguration configuration)
}

// Validate file type is supported by the current version of FileValidator.
if (!FileValidator.SupportedFileDefinitions.Any(f => f.FileType.Equals(fileType)))
if (!FileDefinitions.SupportedFileDefinitions.Any(f => f.FileType.Equals(fileType)))
{
throw new UnsupportedFileException($"File type '{fileType}' is not supported in the current version of FileValidator.");
}
Expand Down
316 changes: 316 additions & 0 deletions src/ByteGuard.FileValidator/FileDefinitions.cs
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,316 @@
using ByteGuard.FileValidator.Models;

namespace ByteGuard.FileValidator;

internal static class FileDefinitions
{
/// <summary>
/// List of all supported valid file definitions, incl. their header signatures (magic numbers)
/// and potentially their corresponding valid subtype signatures.
/// </summary>
internal static readonly List<FileDefinition> SupportedFileDefinitions = new List<FileDefinition>
{
new FileDefinition
{
FileType = FileExtensions.Jpeg,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xFF, 0xD8, 0xFF } // ÿØÿ
}
},
new FileDefinition
{
FileType = FileExtensions.Jpg,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xFF, 0xD8, 0xFF } // ÿØÿ
}
},
new FileDefinition
{
FileType = FileExtensions.Jpe,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xFF, 0xD8, 0xFF } // ÿØÿ
}
},
new FileDefinition
{
FileType = FileExtensions.Pdf,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x25, 0x50, 0x44, 0x46, 0x2D } // %PDF-
}
},
new FileDefinition
{
FileType = FileExtensions.Png,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A } // ‰PNG␍␊␚␊
}
},
new FileDefinition
{
FileType = FileExtensions.Bmp,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x42, 0x4D } // BM
}
},
new FileDefinition
{
FileType = FileExtensions.Doc,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1 } // ÐÏ␑ࡱ␚á
}
},
new FileDefinition
{
FileType = FileExtensions.Docx,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .docx.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.Odp,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .odp.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.Ods,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .ods.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.Odt,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .odt.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.Rtf,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x7B, 0x5C, 0x72, 0x74, 0x66, 0x31 } // {\rtf1
}
},
new FileDefinition
{
FileType = FileExtensions.Xlsx,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .xlsx.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.Xls,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xD0, 0xCF, 0x11, 0xE0, 0xA1, 0xB1, 0x1A, 0xE1 } // ÐÏ␑ࡱ␚á
}
},
new FileDefinition
{
FileType = FileExtensions.Pptx,
// WARNING: This shares the same signature as .zip and could potentially allow for .zip disguised as .pptx.
ValidSignatures = new List<byte[]>
{
new byte[] { 0x50, 0x4B, 0x03, 0x04 } // PK␃␄
}
},
new FileDefinition
{
FileType = FileExtensions.M4a,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x66, 0x74, 0x79, 0x70 } // ftyp
},
SignatureOffset = 4,
HasSubtype = true,
SubtypeOffset = 8,
ValidSubtypeSignatures = new List<byte[]>
{
new byte[] { 0x4D, 0x34, 0x41, 0x20 } // M4A_
}
},
new FileDefinition
{
FileType = FileExtensions.Mov,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x66, 0x74, 0x79, 0x70 } // ftyp
},
SignatureOffset = 4,
HasSubtype = true,
SubtypeOffset = 8,
ValidSubtypeSignatures = new List<byte[]>
{
new byte[] { 0x71, 0x74, 0x20, 0x20 } // qt__ (Quicktime)
}
},
new FileDefinition
{
FileType = FileExtensions.Avi,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x52, 0x49, 0x46, 0x46 } // RIFF
},
HasSubtype = true,
SubtypeOffset = 8,
ValidSubtypeSignatures = new List<byte[]>
{
new byte[] { 0x41, 0x56, 0x49, 0x20 } // AVI_
}
},
new FileDefinition
{
FileType = FileExtensions.Mp3,
ValidSignatures = new List<byte[]>
{
new byte[] { 0xFF, 0xFB }, // Without ID3 tag
new byte[] { 0xFF, 0xF2 }, // Without ID3 tag
new byte[] { 0xFF, 0xF3 }, // Without ID3 tag
new byte[] { 0x49, 0x44, 0x33 } // ID3
}
},
new FileDefinition
{
FileType = FileExtensions.Mp4,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x66, 0x74, 0x79, 0x70 } // ftyp
},
SignatureOffset = 4,
HasSubtype = true,
SubtypeOffset = 8,
ValidSubtypeSignatures = new List<byte[]>
{
new byte[] { 0x6D, 0x6D, 0x70, 0x34 }, // mmp4 (MP4)
new byte[] { 0x6D, 0x70, 0x34, 0x32 }, // mp42 (MP4 v2)
new byte[] { 0x69, 0x73, 0x6F, 0x6D }, // isom (ISO Base Media File)
new byte[] { 0x4D, 0x53, 0x4E, 0x56 } // MSNV (MPEG-4)
}
},
new FileDefinition
{
FileType = FileExtensions.Wav,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x52, 0x49, 0x46, 0x46 } // RIFF
},
HasSubtype = true,
SubtypeOffset = 8,
ValidSubtypeSignatures = new List<byte[]>
{
new byte[] { 0x57, 0x41, 0x56, 0x45 } // WAVE
}
},
new FileDefinition
{
FileType = FileExtensions.Txt,
AllowMissingSignature = true
},
new FileDefinition
{
FileType = FileExtensions.Csv,
AllowMissingSignature = true
},
new FileDefinition
{
FileType = FileExtensions.Ico,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x00, 0x00, 0x01, 0x00 }, // ␀␀␁␀
}
},
new FileDefinition
{
FileType = FileExtensions.Heic,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x66, 0x74, 0x79, 0x70, 0x68, 0x65, 0x69, 0x63 } // ftypheic
},
SignatureOffset = 4
},
new FileDefinition
{
FileType = FileExtensions.Gif,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x47, 0x49, 0x46, 0x38 }, // GIF8
}
},
new FileDefinition
{
FileType = FileExtensions.Tif,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x49, 0x49, 0x2A, 0x00 }, // II*␀ (Intel byte order)
new byte[] { 0x4D, 0x4D, 0x00, 0x2A }, // MM␀* (Motorola byte order)
new byte[] { 0x49, 0x49, 0x2B, 0x00 }, // II+␀ (BigTIFF, Intel byte order)
new byte[] { 0x4D, 0x4D, 0x00, 0x2B } // MM␀+ (BigTIFF, Motorola byte order)
}
},
new FileDefinition
{
FileType = FileExtensions.Tiff,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x49, 0x49, 0x2A, 0x00 }, // II*␀ (Intel byte order)
new byte[] { 0x4D, 0x4D, 0x00, 0x2A }, // MM␀* (Motorola byte order)
new byte[] { 0x49, 0x49, 0x2B, 0x00 }, // II+␀ (BigTIFF, Intel byte order)
new byte[] { 0x4D, 0x4D, 0x00, 0x2B } // MM␀+ (BigTIFF, Motorola byte order)
}
},
new FileDefinition
{
FileType = FileExtensions.Ogg,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x4F, 0x67, 0x67, 0x53 } // OggS
}
},
new FileDefinition
{
FileType = FileExtensions.Oga,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x4F, 0x67, 0x67, 0x53 } // OggS
}
},
new FileDefinition
{
FileType = FileExtensions.Ogv,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x4F, 0x67, 0x67, 0x53 } // OggS
}
},
new FileDefinition
{
FileType = FileExtensions.Ogx,
ValidSignatures = new List<byte[]>
{
new byte[] { 0x4F, 0x67, 0x67, 0x53 } // OggS
}
}
};
}
Loading
Loading