| 63 | } |
| 64 | |
| 65 | std::optional<size_t> EmbeddedScript::decodeHeader(std::span<const uint8_t> data) { |
| 66 | // scan until a null byte is found |
| 67 | auto it = data.begin(); |
| 68 | |
| 69 | |
| 70 | while (it != data.end() && *it != '\0') { |
| 71 | it++; |
| 72 | } |
| 73 | |
| 74 | if (it == data.end()) { |
| 75 | return std::nullopt; |
| 76 | } |
| 77 | |
| 78 | // skip null byte |
| 79 | it++; |
| 80 | |
| 81 | size_t distance = std::distance(it, data.end()); |
| 82 | if (distance < EMBEDDED_SCRIPT_MAGIC.size()) { |
| 83 | return std::nullopt; |
| 84 | } |
| 85 | |
| 86 | for (auto m : EMBEDDED_SCRIPT_MAGIC) { |
| 87 | if ((uint8_t)m != *it) { |
| 88 | return std::nullopt; |
| 89 | } |
| 90 | |
| 91 | it++; |
| 92 | } |
| 93 | |
| 94 | return std::distance(data.begin(), it); |
| 95 | } |
| 96 | |
| 97 | Result<std::vector<uint8_t>> EmbeddedScript::encode(bool includePrefix, std::string_view prefixStr) const { |
| 98 | qn::HeapByteWriter writer; |