Function pick_section_name

src/pe_embed.cpp:34–65

pick a plausible-looking section name derived from the blob bytes

        // pick a plausible-looking section name derived from the blob bytes
        std::string pick_section_name(Span<std::uint8_t> blob) {
            static constexpr const char* kPrefixes[] = {
                ".text", ".code", ".CODE", ".init", ".text0",
            };
            constexpr std::size_t n_pre = sizeof(kPrefixes) / sizeof(kPrefixes[0]);
            static constexpr char kSfxChars[] = "abcdefghijklmnopqrstuvwxyz0123456789";
            constexpr std::size_t n_sfx = sizeof(kSfxChars) - 1;

            // fnv-1a over the blob.
            std::uint64_t h = 0xcbf29ce484222325ULL;
            for (std::size_t i = 0; i < blob.size; ++i) {
                h ^= static_cast<std::uint64_t>(blob[i]);
                h *= 0x100000001b3ULL;
            }

            std::string out(kPrefixes[splitmix64_step(h) % n_pre]);

            // ~25% get the msvc-linker '$' group marker shape.
            if ((splitmix64_step(h) & 0x3) == 0 && out.size() + 2 <= 8) {
                out += '$';
            }

            const std::size_t slots = 8 - out.size();
            if (slots == 0) return out;
            const std::size_t want = 1 + (splitmix64_step(h) % std::min<std::size_t>(slots, 3));

            for (std::size_t i = 0; i < want; ++i) {
                out += kSfxChars[splitmix64_step(h) % n_sfx];
            }

            return out;
        }

        std::vector<std::uint8_t> read_file_bytes(const std::string& path) {
            std::ifstream in(path, std::ios::binary | std::ios::ate);