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string: add AsciiCaseInsensitive{KeyEqual, Hash} for unordered map

Browse Source 
https://httpwg.org/specs/rfc9110.html#rfc.section.5.1
Field names in HTTP headers are case-insensitive. These
structs will be used in the headers map to search by key.

In libevent field names are also converted to lowercase for comparison:
  evhttp_find_header()
  evutil_ascii_strcasecmp()
  EVUTIL_TOLOWER_()
This commit is contained in:
Matthew Zipkin 2024-05-30 15:34:58 -04:00 committed by Matthew Zipkin
parent 4e300df712
commit eea38787b9
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2 changed files with 50 additions and 0 deletions
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35
src/test/util_string_tests.cpp
View File

@ -2,6 +2,7 @@
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <util/strencodings.h>
#include <util/string.h>
#include <boost/test/unit_test.hpp>
@ -146,4 +147,38 @@ BOOST_AUTO_TEST_CASE(ConstevalFormatString_NumSpec)
HasReason{"tinyformat: Too many conversion specifiers in format string"});
}
BOOST_AUTO_TEST_CASE(ascii_case_insensitive_key_equal_test)
{
AsciiCaseInsensitiveKeyEqual cmp;
BOOST_CHECK(!cmp("A", "B"));
BOOST_CHECK(!cmp("A", "b"));
BOOST_CHECK(!cmp("a", "B"));
BOOST_CHECK(!cmp("B", "A"));
BOOST_CHECK(!cmp("B", "a"));
BOOST_CHECK(!cmp("b", "A"));
BOOST_CHECK(!cmp("A", "AA"));
BOOST_CHECK(cmp("A-A", "a-a"));
BOOST_CHECK(cmp("A", "A"));
BOOST_CHECK(cmp("A", "a"));
BOOST_CHECK(cmp("a", "a"));
BOOST_CHECK(cmp("B", "b"));
BOOST_CHECK(cmp("ab", "aB"));
BOOST_CHECK(cmp("Ab", "aB"));
BOOST_CHECK(cmp("AB", "ab"));
// Use a character with value > 127
// to ensure we don't trigger implicit-integer-sign-change
BOOST_CHECK(!cmp("a", "\xe4"));
}
BOOST_AUTO_TEST_CASE(ascii_case_insensitive_hash_test)
{
AsciiCaseInsensitiveHash hsh;
BOOST_CHECK_NE(hsh("A"), hsh("B"));
BOOST_CHECK_NE(hsh("AA"), hsh("A"));
BOOST_CHECK_EQUAL(hsh("A"), hsh("a"));
BOOST_CHECK_EQUAL(hsh("Ab"), hsh("aB"));
BOOST_CHECK_EQUAL(hsh("A\xfe"), hsh("a\xfe"));
}
BOOST_AUTO_TEST_SUITE_END()

15
src/util/strencodings.h
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@ -13,6 +13,7 @@
#include <span.h>
#include <util/string.h>
#include <algorithm>
#include <array>
#include <bit>
#include <charconv>
@ -353,6 +354,20 @@ struct Hex {
};
} // namespace detail
struct AsciiCaseInsensitiveKeyEqual {
bool operator()(std::string_view s1, std::string_view s2) const
{
return ToLower(s1) == ToLower(s2);
}
};
struct AsciiCaseInsensitiveHash {
size_t operator()(std::string_view s) const
{
return std::hash<std::string>{}(ToLower(s));
}
};
/**
* ""_hex is a compile-time user-defined literal returning a
* `std::array<std::byte>`, equivalent to ParseHex(). Variants provided: