Mercurial > minori
annotate include/core/byte_stream.h @ 370:ea3a74ed2ef9
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author | Paper <paper@tflc.us> |
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date | Fri, 25 Jul 2025 10:22:04 -0400 |
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1 #ifndef MINORI_CORE_BYTE_STREAM_H_ |
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2 #define MINORI_CORE_BYTE_STREAM_H_ |
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3 |
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4 #include "core/endian.h" |
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5 |
369 | 6 #include <cstdint> |
7 #include <cstdlib> | |
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8 #include <string> |
369 | 9 #include <type_traits> |
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10 #include <vector> |
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11 |
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12 struct ByteStream { |
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13 public: |
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14 enum class ByteOrder { |
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15 Little, |
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16 Big, |
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17 }; |
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18 |
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19 ByteStream(std::uint8_t *bytes, std::size_t size); |
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20 |
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21 void ResetOffset(); |
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22 void SetEndianness(ByteOrder endian); |
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23 |
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24 template<typename T> |
369 | 25 bool ReadBinary(T &ret) |
26 { | |
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27 if (offset_ + sizeof(T) >= size_) |
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28 return false; |
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29 |
369 | 30 std::memcpy(&ret, bytes_ + offset_, sizeof(ret)); |
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31 Advance(sizeof(T)); |
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32 return true; |
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33 } |
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34 |
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35 template<typename T> |
369 | 36 bool ReadInt(T &ret) |
37 { | |
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38 static_assert(std::is_integral<T>::value); |
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39 |
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40 if (!ReadBinary<T>(ret)) |
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41 return false; |
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42 |
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43 switch (endian_) { |
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44 case ByteOrder::Little: |
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45 if constexpr (std::is_unsigned<T>::value) { |
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46 ret = Endian::byteswap_little_to_host(ret); |
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47 } else { |
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48 ret = Endian::signed_byteswap_little_to_host(ret); |
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49 } |
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50 break; |
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51 case ByteOrder::Big: |
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52 if constexpr (std::is_unsigned<T>::value) { |
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53 ret = Endian::byteswap_big_to_host(ret); |
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54 } else { |
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55 ret = Endian::signed_byteswap_big_to_host(ret); |
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56 } |
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57 break; |
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58 default: |
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59 /* can't know for sure. punt */ |
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60 return false; |
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61 } |
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62 |
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63 return true; |
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64 } |
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65 |
369 | 66 bool ReadString(std::string &str, std::size_t size); |
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67 bool Advance(std::size_t amount); |
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68 |
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69 private: |
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70 /* raw data */ |
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71 std::uint8_t *bytes_ = nullptr; |
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72 std::size_t offset_ = 0; |
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73 std::size_t size_ = 0; |
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74 |
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75 ByteOrder endian_ = ByteOrder::Little; |
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76 }; |
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77 |
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78 #endif /* MINORI_CORE_BYTE_STREAM_H_ */ |