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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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