utils.hpp

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#include <cstdlib>
 
namespace gzip
{
 
    // These live in gzip.hpp because it doesnt need to use deps.
    // Otherwise, they would need to live in impl files if these methods used
    // zlib structures or functions like inflate/deflate)
    inline bool is_compressed(const char* data, std::size_t size)
    {
        return size > 2 && (
                               // zlib
                               (static_cast<uint8_t>(data[0]) == 0x78 &&
                                (static_cast<uint8_t>(data[1]) == 0x9C || static_cast<uint8_t>(data[1]) == 0x01 ||
                                 static_cast<uint8_t>(data[1]) == 0xDA || static_cast<uint8_t>(data[1]) == 0x5E)) ||
                               // gzip
                               (static_cast<uint8_t>(data[0]) == 0x1F && static_cast<uint8_t>(data[1]) == 0x8B));
    }
} // namespace gzip