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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /* | ||
| * Copyright (c) 2022, NVIDIA CORPORATION. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| #pragma once | ||
|
|
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| #include <cudf/types.hpp> | ||
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| /** | ||
| * @file | ||
| * @brief Standalone string functions. | ||
| */ | ||
|
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| namespace cudf { | ||
|
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| using char_utf8 = uint32_t; ///< UTF-8 characters are 1-4 bytes | ||
|
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| namespace strings { | ||
| namespace detail { | ||
|
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| /** | ||
| * @brief This will return true if passed the first byte of a UTF-8 character. | ||
| * | ||
| * @param byte Any byte from a valid UTF-8 character | ||
| * @return true if this the first byte of the character | ||
| */ | ||
| constexpr bool is_begin_utf8_char(uint8_t byte) | ||
| { | ||
| // The (0xC0 & 0x80) bit pattern identifies a continuation byte of a character. | ||
| return (byte & 0xC0) != 0x80; | ||
| } | ||
|
|
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| /** | ||
| * @brief Returns the number of bytes in the specified character. | ||
| * | ||
| * @param character Single character | ||
| * @return Number of bytes | ||
| */ | ||
| constexpr size_type bytes_in_char_utf8(char_utf8 character) | ||
| { | ||
| return 1 + static_cast<size_type>((character & unsigned{0x0000FF00}) > 0) + | ||
| static_cast<size_type>((character & unsigned{0x00FF0000}) > 0) + | ||
| static_cast<size_type>((character & unsigned{0xFF000000}) > 0); | ||
| } | ||
|
|
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| /** | ||
| * @brief Returns the number of bytes used to represent the provided byte. | ||
| * | ||
| * This could be 0 to 4 bytes. 0 is returned for intermediate bytes within a | ||
| * single character. For example, for the two-byte 0xC3A8 single character, | ||
| * the first byte would return 2 and the second byte would return 0. | ||
| * | ||
| * @param byte Byte from an encoded character. | ||
| * @return Number of bytes. | ||
| */ | ||
| constexpr size_type bytes_in_utf8_byte(uint8_t byte) | ||
| { | ||
| return 1 + static_cast<size_type>((byte & 0xF0) == 0xF0) // 4-byte character prefix | ||
| + static_cast<size_type>((byte & 0xE0) == 0xE0) // 3-byte character prefix | ||
| + static_cast<size_type>((byte & 0xC0) == 0xC0) // 2-byte character prefix | ||
| - static_cast<size_type>((byte & 0xC0) == 0x80); // intermediate byte | ||
| } | ||
|
|
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| /** | ||
| * @brief Convert a char array into a char_utf8 value. | ||
| * | ||
| * @param str String containing encoded char bytes. | ||
| * @param[out] character Single char_utf8 value. | ||
| * @return The number of bytes in the character | ||
| */ | ||
| constexpr size_type to_char_utf8(const char* str, char_utf8& character) | ||
| { | ||
| size_type const chr_width = bytes_in_utf8_byte(static_cast<uint8_t>(*str)); | ||
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| character = static_cast<char_utf8>(*str++) & 0xFF; | ||
| if (chr_width > 1) { | ||
| character = character << 8; | ||
| character |= (static_cast<char_utf8>(*str++) & 0xFF); // << 8; | ||
| if (chr_width > 2) { | ||
| character = character << 8; | ||
| character |= (static_cast<char_utf8>(*str++) & 0xFF); // << 16; | ||
| if (chr_width > 3) { | ||
| character = character << 8; | ||
| character |= (static_cast<char_utf8>(*str++) & 0xFF); // << 24; | ||
| } | ||
| } | ||
| } | ||
| return chr_width; | ||
| } | ||
|
|
||
| /** | ||
| * @brief Place a char_utf8 value into a char array. | ||
| * | ||
| * @param character Single character | ||
| * @param[out] str Output array. | ||
| * @return The number of bytes in the character | ||
| */ | ||
| constexpr inline size_type from_char_utf8(char_utf8 character, char* str) | ||
| { | ||
| size_type const chr_width = bytes_in_char_utf8(character); | ||
| for (size_type idx = 0; idx < chr_width; ++idx) { | ||
| str[chr_width - idx - 1] = static_cast<char>(character) & 0xFF; | ||
| character = character >> 8; | ||
| } | ||
| return chr_width; | ||
| } | ||
|
|
||
| } // namespace detail | ||
| } // namespace strings | ||
| } // namespace cudf |
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