template std::pair lasx_convert_utf32_to_utf16(const char32_t *buf, size_t len, char16_t *utf16_out) { uint16_t *utf16_output = reinterpret_cast(utf16_out); const char32_t *end = buf + len; // Performance degradation when memory address is not 32-byte aligned while (((uint64_t)utf16_output & 0x1F) && buf < end) { uint32_t word = *buf++; if ((word & 0xFFFF0000) == 0) { // will not generate a surrogate pair if (word >= 0xD800 && word <= 0xDFFF) { return std::make_pair(nullptr, reinterpret_cast(utf16_output)); } *utf16_output++ = !match_system(big_endian) ? char16_t(word >> 8 | word << 8) : char16_t(word); // buf++; } else { // will generate a surrogate pair if (word > 0x10FFFF) { return std::make_pair(nullptr, reinterpret_cast(utf16_output)); } word -= 0x10000; uint16_t high_surrogate = uint16_t(0xD800 + (word >> 10)); uint16_t low_surrogate = uint16_t(0xDC00 + (word & 0x3FF)); if (!match_system(big_endian)) { high_surrogate = uint16_t(high_surrogate >> 8 | high_surrogate << 8); low_surrogate = uint16_t(low_surrogate << 8 | low_surrogate >> 8); } *utf16_output++ = char16_t(high_surrogate); *utf16_output++ = char16_t(low_surrogate); // buf++; } } __m256i forbidden_bytemask = __lasx_xvrepli_h(0); __m256i v_d800 = __lasx_xvldi(-2600); /*0xD800*/ __m256i v_dfff = __lasx_xvreplgr2vr_h(uint16_t(0xdfff)); while (buf + 16 <= end) { __m256i in0 = __lasx_xvld(reinterpret_cast(buf), 0); __m256i in1 = __lasx_xvld(reinterpret_cast(buf), 32); // Check if no bits set above 16th if (__lasx_xbz_v(__lasx_xvpickod_h(in1, in0))) { __m256i utf16_packed = __lasx_xvpermi_d(__lasx_xvpickev_h(in1, in0), 0b11011000); forbidden_bytemask = __lasx_xvor_v( __lasx_xvand_v( __lasx_xvsle_h(utf16_packed, v_dfff), // utf16_packed <= 0xdfff __lasx_xvsle_h(v_d800, utf16_packed)), // utf16_packed >= 0xd800 forbidden_bytemask); if (!match_system(big_endian)) { utf16_packed = lasx_swap_bytes(utf16_packed); } __lasx_xvst(utf16_packed, utf16_output, 0); utf16_output += 16; buf += 16; } else { size_t forward = 15; size_t k = 0; if (size_t(end - buf) < forward + 1) { forward = size_t(end - buf - 1); } for (; k < forward; k++) { uint32_t word = buf[k]; if ((word & 0xFFFF0000) == 0) { // will not generate a surrogate pair if (word >= 0xD800 && word <= 0xDFFF) { return std::make_pair(nullptr, reinterpret_cast(utf16_output)); } *utf16_output++ = !match_system(big_endian) ? char16_t(word >> 8 | word << 8) : char16_t(word); } else { // will generate a surrogate pair if (word > 0x10FFFF) { return std::make_pair(nullptr, reinterpret_cast(utf16_output)); } word -= 0x10000; uint16_t high_surrogate = uint16_t(0xD800 + (word >> 10)); uint16_t low_surrogate = uint16_t(0xDC00 + (word & 0x3FF)); if (!match_system(big_endian)) { high_surrogate = uint16_t(high_surrogate >> 8 | high_surrogate << 8); low_surrogate = uint16_t(low_surrogate << 8 | low_surrogate >> 8); } *utf16_output++ = char16_t(high_surrogate); *utf16_output++ = char16_t(low_surrogate); } } buf += k; } } // check for invalid input if (__lasx_xbnz_v(forbidden_bytemask)) { return std::make_pair(nullptr, reinterpret_cast(utf16_output)); } return std::make_pair(buf, reinterpret_cast(utf16_output)); } template std::pair lasx_convert_utf32_to_utf16_with_errors(const char32_t *buf, size_t len, char16_t *utf16_out) { uint16_t *utf16_output = reinterpret_cast(utf16_out); const char32_t *start = buf; const char32_t *end = buf + len; // Performance degradation when memory address is not 32-byte aligned while (((uint64_t)utf16_output & 0x1F) && buf < end) { uint32_t word = *buf++; if ((word & 0xFFFF0000) == 0) { // will not generate a surrogate pair if (word >= 0xD800 && word <= 0xDFFF) { return std::make_pair(result(error_code::SURROGATE, buf - start - 1), reinterpret_cast(utf16_output)); } *utf16_output++ = !match_system(big_endian) ? char16_t(word >> 8 | word << 8) : char16_t(word); } else { // will generate a surrogate pair if (word > 0x10FFFF) { return std::make_pair(result(error_code::TOO_LARGE, buf - start - 1), reinterpret_cast(utf16_output)); } word -= 0x10000; uint16_t high_surrogate = uint16_t(0xD800 + (word >> 10)); uint16_t low_surrogate = uint16_t(0xDC00 + (word & 0x3FF)); if (!match_system(big_endian)) { high_surrogate = uint16_t(high_surrogate >> 8 | high_surrogate << 8); low_surrogate = uint16_t(low_surrogate << 8 | low_surrogate >> 8); } *utf16_output++ = char16_t(high_surrogate); *utf16_output++ = char16_t(low_surrogate); } } __m256i forbidden_bytemask = __lasx_xvrepli_h(0); __m256i v_d800 = __lasx_xvldi(-2600); /*0xD800*/ __m256i v_dfff = __lasx_xvreplgr2vr_h(uint16_t(0xdfff)); while (buf + 16 <= end) { __m256i in0 = __lasx_xvld(reinterpret_cast(buf), 0); __m256i in1 = __lasx_xvld(reinterpret_cast(buf), 32); // Check if no bits set above 16th if (__lasx_xbz_v(__lasx_xvpickod_h(in1, in0))) { __m256i utf16_packed = __lasx_xvpermi_d(__lasx_xvpickev_h(in1, in0), 0b11011000); forbidden_bytemask = __lasx_xvor_v( __lasx_xvand_v( __lasx_xvsle_h(utf16_packed, v_dfff), // utf16_packed <= 0xdfff __lasx_xvsle_h(v_d800, utf16_packed)), // utf16_packed >= 0xd800 forbidden_bytemask); if (__lasx_xbnz_v(forbidden_bytemask)) { return std::make_pair(result(error_code::SURROGATE, buf - start), reinterpret_cast(utf16_output)); } if (!match_system(big_endian)) { utf16_packed = lasx_swap_bytes(utf16_packed); } __lasx_xvst(utf16_packed, utf16_output, 0); utf16_output += 16; buf += 16; } else { size_t forward = 15; size_t k = 0; if (size_t(end - buf) < forward + 1) { forward = size_t(end - buf - 1); } for (; k < forward; k++) { uint32_t word = buf[k]; if ((word & 0xFFFF0000) == 0) { // will not generate a surrogate pair if (word >= 0xD800 && word <= 0xDFFF) { return std::make_pair( result(error_code::SURROGATE, buf - start + k), reinterpret_cast(utf16_output)); } *utf16_output++ = !match_system(big_endian) ? char16_t(word >> 8 | word << 8) : char16_t(word); } else { // will generate a surrogate pair if (word > 0x10FFFF) { return std::make_pair( result(error_code::TOO_LARGE, buf - start + k), reinterpret_cast(utf16_output)); } word -= 0x10000; uint16_t high_surrogate = uint16_t(0xD800 + (word >> 10)); uint16_t low_surrogate = uint16_t(0xDC00 + (word & 0x3FF)); if (!match_system(big_endian)) { high_surrogate = uint16_t(high_surrogate >> 8 | high_surrogate << 8); low_surrogate = uint16_t(low_surrogate << 8 | low_surrogate >> 8); } *utf16_output++ = char16_t(high_surrogate); *utf16_output++ = char16_t(low_surrogate); } } buf += k; } } return std::make_pair(result(error_code::SUCCESS, buf - start), reinterpret_cast(utf16_output)); } rtonge/fix/login_flow_v2_sessions_2'>artonge/fix/login_flow_v2_sessions_2 Nextcloud server, a safe home for all your data: https://github.com/nextcloud/serverwww-data
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