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https://github.com/boostorg/mqtt5.git
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c18e5fc4f4
Summary: resolves T13170 Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Maniphest Tasks: T13170 Differential Revision: https://repo.mireo.local/D26728
83 lines
1.8 KiB
C++
83 lines
1.8 KiB
C++
#ifndef ASYNC_MQTT5_UTF8_MQTT_HPP
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#define ASYNC_MQTT5_UTF8_MQTT_HPP
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#include <cstdint>
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#include <string>
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namespace async_mqtt5::detail {
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struct code_point {
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int32_t val;
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uint32_t size;
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auto operator<=>(const code_point&) const = default;
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static code_point from(std::string_view s) {
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auto hnibble = s[0] & 0xF0;
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return
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(hnibble & 0x80) == 0 ?
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code_point { s[0], 1 }
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:
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(hnibble == 0xC0 || hnibble == 0xD0) && s.size() > 1 ?
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code_point {
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(int32_t(s[0] & 0x1F) << 6) | int32_t(s[1] & 0x3F),
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2
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}
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:
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(hnibble == 0xE0) && s.size() > 2 ?
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code_point {
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(int32_t(s[0] & 0x1F) << 12) |
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(int32_t(s[1] & 0x3F) << 6) |
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int32_t(s[2] & 0x3F),
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3
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}
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:
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(hnibble == 0xF0) && s.size() > 3 ?
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code_point {
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(int32_t(s[0] & 0x1F) << 18) |
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(int32_t(s[1] & 0x3F) << 12) |
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(int32_t(s[2] & 0x3F) << 6) |
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int32_t(s[3] & 0x3F),
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4
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}
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:
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code_point { -1, 0 };
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}
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};
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inline bool is_valid_mqtt_utf8(std::string_view str) {
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constexpr size_t max_sz = 65535;
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if (str.size() > max_sz)
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return false;
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auto is_valid_cp = [](int32_t c) -> bool {
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constexpr int32_t fe_flag = 0xFE;
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constexpr int32_t ff_flag = 0xFF;
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return c >= 32 && // U+0000...U+001F control characters
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(c < 127 || c > 159) && // U+007F...0+009F control characters
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(c < 55296 || c > 57343) && // U+D800...U+DFFF surrogates
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(c < 64976 || c > 65007) &&// U+FDD0...U+FDEF non-characters
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(c & fe_flag) != fe_flag && // non-characters
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(c & ff_flag) != ff_flag;
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};
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while (!str.empty()) {
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auto cp = code_point::from(str.data());
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if (!is_valid_cp(cp.val))
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return false;
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str.remove_prefix(cp.size);
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}
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return true;
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}
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inline bool is_valid_utf8_topic(std::string_view str) {
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return !str.empty() && is_valid_mqtt_utf8(str);
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}
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} // namespace async_mqtt5::detail
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#endif //ASYNC_MQTT5_UTF8_MQTT_HPP
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