utf8-decode.hh

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/*
 
MIT License
 
Copyright (c) 2026 PCSX-Redux authors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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*/
 
#pragma once
 
#include <stdint.h>
 
// Minimal, table-free UTF-8 codepoint decoder. Split out of sjis-encode.h so
// that the lightweight (no conversion table) code paths can decode UTF-8
// without dragging in the ~28kB Shift-JIS encoding table. Usable from both the
// host and the MIPS targets.
 
namespace Sjis {
 
// Decodes one UTF-8 codepoint from str, advancing *index. Returns the codepoint,
// or 0xfffd (replacement) on a malformed sequence. Codepoints above the BMP are
// returned truncated to 0xfffd since Shift-JIS cannot represent them.
uint16_t utf8Decode(const char* str, uint32_t length, uint32_t* index);
 
}  // namespace Sjis