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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | pmbaty | 1 | #pragma once |
| 2 | |||
| 3 | #include <algorithm> |
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| 4 | #include <cstddef> |
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| 5 | #include <cstdint> |
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| 6 | #include "dxxsconf.h" |
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| 7 | #include "pack.h" |
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| 8 | #include <array> |
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| 9 | |||
| 10 | template <std::size_t L> |
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| 11 | class ntstring : |
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| 12 | public prohibit_void_ptr<ntstring<L>>, |
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| 13 | public std::array<char, L + 1> |
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| 14 | { |
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| 15 | static char terminator() { return 0; } |
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| 16 | public: |
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| 17 | using array_t = std::array<char, L + 1>; |
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| 18 | typedef char elements_t[L + 1]; |
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| 19 | using array_t::operator[]; |
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| 20 | typename array_t::reference operator[](int i) { return array_t::operator[](i); } |
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| 21 | typename array_t::reference operator[](unsigned i) { return array_t::operator[](i); } |
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| 22 | __attribute_nonnull() |
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| 23 | std::size_t _copy_n(std::size_t offset, const char *ib, std::size_t N) |
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| 24 | { |
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| 25 | if (offset >= this->size()) |
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| 26 | return 0; |
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| 27 | auto eb = ib; |
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| 28 | std::size_t r = (offset + N) <= L ? N : 0; |
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| 29 | if (r) |
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| 30 | eb += N; |
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| 31 | auto ob = std::next(this->begin(), offset); |
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| 32 | auto oc = std::copy(ib, eb, ob); |
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| 33 | std::fill(oc, this->end(), terminator()); |
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| 34 | return r; |
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| 35 | } |
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| 36 | template <std::size_t N> |
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| 37 | __attribute_nonnull() |
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| 38 | std::size_t _copy(std::size_t offset, const char *i) |
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| 39 | { |
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| 40 | static_assert(N <= L, "string too long"); |
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| 41 | return _copy_n(offset, i, N); |
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| 42 | } |
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| 43 | template <typename I> |
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| 44 | std::size_t copy_if(I &&i) |
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| 45 | { |
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| 46 | return copy_if(static_cast<std::size_t>(0), static_cast<I &&>(i)); |
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| 47 | } |
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| 48 | template <typename I> |
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| 49 | std::size_t copy_if(I &&i, std::size_t N) |
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| 50 | { |
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| 51 | return copy_if(static_cast<std::size_t>(0), static_cast<I &&>(i), N); |
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| 52 | } |
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| 53 | template <typename I> |
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| 54 | std::size_t copy_if(std::size_t out_offset, I &&i) |
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| 55 | { |
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| 56 | return copy_if(out_offset, static_cast<I &&>(i), this->size()); |
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| 57 | } |
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| 58 | template <std::size_t N> |
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| 59 | std::size_t copy_if(std::size_t out_offset, const std::array<char, N> &i, std::size_t n = N) |
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| 60 | { |
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| 61 | #ifdef DXX_CONSTANT_TRUE |
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| 62 | if (DXX_CONSTANT_TRUE(n > N)) |
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| 63 | DXX_ALWAYS_ERROR_FUNCTION(dxx_trap_overread, "read size exceeds array size"); |
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| 64 | #endif |
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| 65 | return copy_if(out_offset, i.data(), n); |
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| 66 | } |
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| 67 | template <std::size_t N> |
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| 68 | std::size_t copy_if(std::size_t out_offset, const char (&i)[N]) |
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| 69 | { |
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| 70 | static_assert(N <= L + 1, "string too long"); |
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| 71 | return copy_if(out_offset, i, N); |
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| 72 | } |
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| 73 | __attribute_nonnull() |
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| 74 | std::size_t copy_if(std::size_t offset, const char *i, std::size_t N) |
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| 75 | { |
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| 76 | const std::size_t d = |
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| 77 | #ifdef DXX_CONSTANT_TRUE |
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| 78 | (DXX_CONSTANT_TRUE(!i[N - 1])) ? N - 1 : |
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| 79 | #endif |
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| 80 | std::distance(i, std::find(i, i + N, terminator())); |
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| 81 | return _copy_n(offset, i, d); |
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| 82 | } |
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| 83 | __attribute_nonnull() |
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| 84 | std::size_t _copy_out(const std::size_t src_offset, char *const dst_base, const std::size_t dst_offset, const std::size_t max_copy) const |
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| 85 | { |
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| 86 | char *const dst = dst_base + dst_offset; |
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| 87 | if (L > max_copy || src_offset >= this->size()) |
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| 88 | { |
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| 89 | /* Some outputs might not fit or nothing to copy */ |
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| 90 | *dst = terminator(); |
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| 91 | return 1; |
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| 92 | } |
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| 93 | const auto ie = std::prev(this->end()); |
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| 94 | const auto ib = std::next(this->begin(), src_offset); |
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| 95 | auto ii = std::find(ib, ie, terminator()); |
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| 96 | if (ii != ie) |
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| 97 | /* Only copy null if string is short */ |
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| 98 | ++ ii; |
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| 99 | const std::size_t r = std::distance(ib, ii); |
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| 100 | if (r > max_copy) |
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| 101 | { |
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| 102 | /* This output does not fit */ |
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| 103 | *dst = terminator(); |
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| 104 | return 1; |
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| 105 | } |
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| 106 | std::copy(ib, ii, dst); |
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| 107 | return r; |
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| 108 | } |
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| 109 | __attribute_nonnull() |
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| 110 | std::size_t copy_out(std::size_t src_offset, char *dst, std::size_t dst_offset, std::size_t dst_size) const |
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| 111 | { |
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| 112 | if (dst_size <= dst_offset) |
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| 113 | return 0; |
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| 114 | return _copy_out(src_offset, dst, dst_offset, dst_size - dst_offset); |
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| 115 | } |
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| 116 | __attribute_nonnull() |
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| 117 | std::size_t copy_out(std::size_t src_offset, char *dst, std::size_t dst_size) const |
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| 118 | { |
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| 119 | return copy_out(src_offset, dst, 0, dst_size); |
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| 120 | } |
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| 121 | template <std::size_t N> |
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| 122 | std::size_t copy_out(std::size_t src_offset, std::array<char, N> &dst, std::size_t dst_offset) const |
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| 123 | { |
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| 124 | return copy_out(src_offset, dst.data(), dst_offset, N); |
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| 125 | } |
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| 126 | template <std::size_t N> |
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| 127 | std::size_t copy_out(std::size_t src_offset, std::array<uint8_t, N> &dst, std::size_t dst_offset) const |
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| 128 | { |
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| 129 | return copy_out(src_offset, reinterpret_cast<char *>(dst.data()), dst_offset, N); |
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| 130 | } |
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| 131 | operator bool() const = delete; |
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| 132 | operator char *() const = delete; |
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| 133 | operator elements_t &() const = delete; |
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| 134 | operator const elements_t &() const |
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| 135 | { |
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| 136 | return *reinterpret_cast<const elements_t *>(this->data()); |
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| 137 | } |
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| 138 | bool operator==(const ntstring &r) const __attribute_warn_unused_result |
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| 139 | { |
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| 140 | return static_cast<const array_t &>(*this) == static_cast<const array_t &>(r); |
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| 141 | } |
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| 142 | bool operator!=(const ntstring &r) const __attribute_warn_unused_result |
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| 143 | { |
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| 144 | return !(*this == r); |
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| 145 | } |
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| 146 | template <std::size_t N> |
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| 147 | ntstring &operator=(const char (&i)[N]) |
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| 148 | { |
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| 149 | copy_if(i); |
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| 150 | return *this; |
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| 151 | } |
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| 152 | }; |