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annotate include/core/byte_stream.h @ 370:ea3a74ed2ef9

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author Paper <paper@tflc.us>
date Fri, 25 Jul 2025 10:22:04 -0400
parents 47c9f8502269
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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
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6 #include <cstdint>
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7 #include <cstdlib>
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8 #include <string>
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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>
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25 bool ReadBinary(T &ret)
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26 {
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27 if (offset_ + sizeof(T) >= size_)
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28 return false;
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29
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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>
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36 bool ReadInt(T &ret)
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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
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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_ */