diff --git a/Userland/Libraries/LibGfx/Font/OpenType/Tables.cpp b/Userland/Libraries/LibGfx/Font/OpenType/Tables.cpp index 5e5a0a0acb..520c02bcb7 100644 --- a/Userland/Libraries/LibGfx/Font/OpenType/Tables.cpp +++ b/Userland/Libraries/LibGfx/Font/OpenType/Tables.cpp @@ -32,6 +32,17 @@ ErrorOr Head::from_slice(ReadonlyBytes slice) return Error::from_string_literal("Could not load Head: Not enough data"); auto const& font_header_table = *bit_cast(slice.data()); + + static constexpr u32 HEADER_TABLE_MAGIC_NUMBER = 0x5F0F3CF5; + if (font_header_table.major_version != 1) + return Error::from_string_literal("Unknown major version. Expected 1"); + if (font_header_table.minor_version != 0) + return Error::from_string_literal("Unknown minor version. Expected 0"); + if (font_header_table.magic_number != HEADER_TABLE_MAGIC_NUMBER) + return Error::from_string_literal("Invalid magic number"); + if (font_header_table.index_to_loc_format != 0 && font_header_table.index_to_loc_format != 1) + return Error::from_string_literal("Invalid IndexToLocFormat value"); + return Head(font_header_table); }