libs/url/src/detail/decode.cpp
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libs/url/src/detail/decode.cpp
| Line | Branch | Hits | Source Code |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | |||
| 11 | #include <boost/url/detail/config.hpp> | ||
| 12 | #include "decode.hpp" | ||
| 13 | #include <boost/url/grammar/charset.hpp> | ||
| 14 | #include <boost/url/grammar/hexdig_chars.hpp> | ||
| 15 | #include <memory> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace urls { | ||
| 19 | namespace detail { | ||
| 20 | |||
| 21 | char | ||
| 22 | 856 | decode_one( | |
| 23 | char const* const it) noexcept | ||
| 24 | { | ||
| 25 | 856 | auto d0 = grammar::hexdig_value(it[0]); | |
| 26 | 856 | auto d1 = grammar::hexdig_value(it[1]); | |
| 27 | return static_cast<char>( | ||
| 28 | 856 | ((static_cast< | |
| 29 | 856 | unsigned char>(d0) << 4) + | |
| 30 | 856 | (static_cast< | |
| 31 | 856 | unsigned char>(d1)))); | |
| 32 | } | ||
| 33 | |||
| 34 | std::size_t | ||
| 35 | 2212 | decode_bytes_unsafe( | |
| 36 | core::string_view s) noexcept | ||
| 37 | { | ||
| 38 | 2212 | auto p = s.begin(); | |
| 39 | 2212 | auto const end = s.end(); | |
| 40 | 2212 | std::size_t dn = 0; | |
| 41 |
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2212 | if(s.size() >= 3) |
| 42 | { | ||
| 43 | 1023 | auto const safe_end = end - 2; | |
| 44 |
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8336 | while(p < safe_end) |
| 45 | { | ||
| 46 |
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7313 | if(*p != '%') |
| 47 | 7047 | p += 1; | |
| 48 | else | ||
| 49 | 266 | p += 3; | |
| 50 | 7313 | ++dn; | |
| 51 | } | ||
| 52 | } | ||
| 53 | 2212 | dn += end - p; | |
| 54 | 2212 | return dn; | |
| 55 | } | ||
| 56 | |||
| 57 | template <bool SpaceAsPlus> | ||
| 58 | std::size_t | ||
| 59 | decode_unsafe_is_plus_impl(char c); | ||
| 60 | |||
| 61 | template <> | ||
| 62 | std::size_t | ||
| 63 | 7591 | decode_unsafe_is_plus_impl<true>(char c) | |
| 64 | { | ||
| 65 | 7591 | return c == '+'; | |
| 66 | } | ||
| 67 | |||
| 68 | template <> | ||
| 69 | std::size_t | ||
| 70 | 7618 | decode_unsafe_is_plus_impl<false>(char) | |
| 71 | { | ||
| 72 | 7618 | return false; | |
| 73 | } | ||
| 74 | |||
| 75 | |||
| 76 | template <bool SpaceAsPlus> | ||
| 77 | std::size_t | ||
| 78 | 2814 | decode_unsafe_impl( | |
| 79 | char* const dest0, | ||
| 80 | char const* end, | ||
| 81 | core::string_view s) noexcept | ||
| 82 | { | ||
| 83 | 2814 | auto it = s.data(); | |
| 84 | 2814 | auto const last = it + s.size(); | |
| 85 | 2814 | auto dest = dest0; | |
| 86 | |||
| 87 |
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18023 | while(it != last) |
| 88 | { | ||
| 89 | // LCOV_EXCL_START | ||
| 90 | − | if(dest == end) | |
| 91 | { | ||
| 92 | /* | ||
| 93 | * dest too small: unreachable | ||
| 94 | * public functions always pass | ||
| 95 | * a buffer of sufficient size | ||
| 96 | */ | ||
| 97 | − | return dest - dest0; | |
| 98 | } | ||
| 99 | // LCOV_EXCL_STOP | ||
| 100 |
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15209 | if(decode_unsafe_is_plus_impl<SpaceAsPlus>(*it)) |
| 101 | { | ||
| 102 | // plus to space | ||
| 103 | 39 | *dest++ = ' '; | |
| 104 | 39 | ++it; | |
| 105 | 39 | continue; | |
| 106 | } | ||
| 107 |
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15170 | if(*it == '%') |
| 108 | { | ||
| 109 | // escaped | ||
| 110 | 738 | ++it; | |
| 111 | // LCOV_EXCL_START | ||
| 112 | − | if(last - it < 2) | |
| 113 | { | ||
| 114 | // `%` not followed by two hex digits | ||
| 115 | // invalid input: unreachable | ||
| 116 | // public functions always pass | ||
| 117 | // a valid string_view. | ||
| 118 | // initialize output | ||
| 119 | − | std::memset(dest, | |
| 120 | − | 0, end - dest); | |
| 121 | − | return dest - dest0; | |
| 122 | } | ||
| 123 | // LCOV_EXCL_STOP | ||
| 124 | 738 | *dest++ = decode_one(it); | |
| 125 | 738 | it += 2; | |
| 126 | 738 | continue; | |
| 127 | } | ||
| 128 | // unescaped | ||
| 129 | 14432 | *dest++ = *it++; | |
| 130 | } | ||
| 131 | 2814 | return dest - dest0; | |
| 132 | } | ||
| 133 | |||
| 134 | std::size_t | ||
| 135 | 2814 | decode_unsafe( | |
| 136 | char* const dest0, | ||
| 137 | char const* end, | ||
| 138 | core::string_view s, | ||
| 139 | encoding_opts opt) noexcept | ||
| 140 | { | ||
| 141 |
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2814 | if(opt.space_as_plus) |
| 142 | { | ||
| 143 | 1245 | return decode_unsafe_impl<true>( | |
| 144 | 1245 | dest0, end, s); | |
| 145 | } | ||
| 146 | 1569 | return decode_unsafe_impl<false>( | |
| 147 | 1569 | dest0, end, s); | |
| 148 | } | ||
| 149 | |||
| 150 | } // detail | ||
| 151 | } // urls | ||
| 152 | } // boost | ||
| 153 | |||
| 154 |