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- // Copyright 2018 Google LLC.
- // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
- #ifndef SkUTF_DEFINED
- #define SkUTF_DEFINED
- #include <cstddef>
- #include <cstdint>
- typedef int32_t SkUnichar;
- namespace SkUTF {
- /** Given a sequence of UTF-8 bytes, return the number of unicode codepoints.
- If the sequence is invalid UTF-8, return -1.
- */
- int CountUTF8(const char* utf8, size_t byteLength);
- /** Given a sequence of aligned UTF-16 characters in machine-endian form,
- return the number of unicode codepoints. If the sequence is invalid
- UTF-16, return -1.
- */
- int CountUTF16(const uint16_t* utf16, size_t byteLength);
- /** Given a sequence of aligned UTF-32 characters in machine-endian form,
- return the number of unicode codepoints. If the sequence is invalid
- UTF-32, return -1.
- */
- int CountUTF32(const int32_t* utf32, size_t byteLength);
- /** Given a sequence of UTF-8 bytes, return the first unicode codepoint.
- The pointer will be incremented to point at the next codepoint's start. If
- invalid UTF-8 is encountered, set *ptr to end and return -1.
- */
- SkUnichar NextUTF8(const char** ptr, const char* end);
- /** Given a sequence of aligned UTF-16 characters in machine-endian form,
- return the first unicode codepoint. The pointer will be incremented to
- point at the next codepoint's start. If invalid UTF-16 is encountered,
- set *ptr to end and return -1.
- */
- SkUnichar NextUTF16(const uint16_t** ptr, const uint16_t* end);
- /** Given a sequence of aligned UTF-32 characters in machine-endian form,
- return the first unicode codepoint. The pointer will be incremented to
- point at the next codepoint's start. If invalid UTF-32 is encountered,
- set *ptr to end and return -1.
- */
- SkUnichar NextUTF32(const int32_t** ptr, const int32_t* end);
- constexpr unsigned kMaxBytesInUTF8Sequence = 4;
- /** Convert the unicode codepoint into UTF-8. If `utf8` is non-null, place the
- result in that array. Return the number of bytes in the result. If `utf8`
- is null, simply return the number of bytes that would be used. For invalid
- unicode codepoints, return 0.
- */
- size_t ToUTF8(SkUnichar uni, char utf8[kMaxBytesInUTF8Sequence] = nullptr);
- /** Convert the unicode codepoint into UTF-16. If `utf16` is non-null, place
- the result in that array. Return the number of UTF-16 code units in the
- result (1 or 2). If `utf16` is null, simply return the number of code
- units that would be used. For invalid unicode codepoints, return 0.
- */
- size_t ToUTF16(SkUnichar uni, uint16_t utf16[2] = nullptr);
- } // namespace SkUTF
- #endif // SkUTF_DEFINED
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