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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103const std = @import("std");
const type_details: []const struct { typ: FileType, sigs: []const []const ?u8, exts: []const []const u8,} = &.{ .{ .typ = .jpeg, .sigs = &.{ &.{ 0xFF, 0xD8, 0xFF, 0xDB }, &.{ 0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10, 0x4A, 0x46, 0x49, 0x46, 0x00, 0x01 }, &.{ 0xFF, 0xD8, 0xFF, 0xEE }, &.{ 0xFF, 0xD8, 0xFF, 0xE1, null, null, 0x45, 0x78, 0x69, 0x66, 0x00, 0x00 }, &.{ 0xFF, 0xD8, 0xFF, 0xE0 }, }, .exts = &.{ ".jpg", ".jpeg", ".jfif" }, }, .{ .typ = .png, .sigs = &.{&.{ 0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A }}, .exts = &.{".png"}, }, .{ .typ = .gif, .sigs = &.{ &.{ 'G', 'I', 'F', '8', '7', 'a' }, &.{ 'G', 'I', 'F', '8', '9', 'a' }, }, .exts = &.{".gif"}, }, .{ .typ = .bmp, .sigs = &.{&.{ 'B', 'M' }}, .exts = &.{".bmp"}, }, .{ .typ = .qoi, .sigs = &.{&.{ 'q', 'o', 'i', 'f' }}, .exts = &.{".qoi"}, }, .{ .typ = .webp, .sigs = &.{ &.{ 0x52, 0x49, 0x46, 0x46, null, null, null, null, 0x57, 0x45, 0x42, 0x50 }, }, .exts = &.{".webp"}, },};
/// This is a helper for detecting file types based on magic bytes.////// Ref: https://en.wikipedia.org/wiki/List_of_file_signaturespub const FileType = enum { /// JPEG image file. jpeg,
/// PNG image file. png,
/// GIF image file. gif,
/// BMP image file. bmp,
/// QOI image file. qoi,
/// WebP image file. webp,
/// Unknown file format. unknown,
/// Detect file type based on the magic bytes /// at the start of the provided file contents. pub fn detect(contents: []const u8) FileType { inline for (type_details) |typ| { inline for (typ.sigs) |signature| { if (contents.len >= signature.len) { for (contents[0..signature.len], signature) |f, sig| { if (sig) |s| if (f != s) break; } else { return typ.typ; } } } } return .unknown; }
/// Guess file type from its extension. pub fn guessFromExtension(extension: []const u8) FileType { inline for (type_details) |typ| { inline for (typ.exts) |ext| { if (std.ascii.eqlIgnoreCase(extension, ext)) return typ.typ; } } return .unknown; }};