29 lines
898 B
C++
29 lines
898 B
C++
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#include "font_validator.hpp"
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namespace pdfengine::fonts::pdf_fonts {
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bool FontValidator::isValidSFNT(const std::vector<uint8_t>& bytes) {
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if (bytes.size() < 12) { // Minimum SFNT header size
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return false;
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}
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// Check SFNT version / magic bytes
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// 0x00010000 for TrueType
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// 0x4F54544F ("OTTO") for OpenType CFF
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// 0x74727565 ("true") for Apple TrueType
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// 0x74797031 ("typ1") for Mac PostScript Type 1
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const uint8_t* b = bytes.data();
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uint32_t magic = (static_cast<uint32_t>(b[0]) << 24) |
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(static_cast<uint32_t>(b[1]) << 16) |
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(static_cast<uint32_t>(b[2]) << 8) |
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static_cast<uint32_t>(b[3]);
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if (magic == 0x00010000 || magic == 0x4F54544F || magic == 0x74727565 || magic == 0x74797031) {
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return true;
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}
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return false;
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}
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} // namespace pdfengine::fonts::pdf_fonts
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