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BAN: Implement BAN::UTF8::to_codepoint() for single byte types

This commit is contained in:
Bananymous 2024-06-03 03:39:57 +03:00
parent aec5a09caf
commit 939cbf46e4
1 changed files with 7 additions and 6 deletions
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13
BAN/include/BAN/UTF8.h
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@ -21,20 +21,21 @@ namespace BAN::UTF8
return 0;
}
constexpr uint32_t to_codepoint(uint8_t* bytes)
template<typename T> requires (sizeof(T) == 1)
constexpr uint32_t to_codepoint(const T* bytes)
{
uint32_t length = byte_length(bytes[0]);
for (uint32_t i = 1; i < length; i++)
if ((bytes[i] & 0xC0) != 0x80)
if (((uint8_t)bytes[i] & 0xC0) != 0x80)
return UTF8::invalid;
switch (length)
{
case 1: return ((bytes[0] & 0x80) != 0x00) ? UTF8::invalid : bytes[0];
case 2: return ((bytes[0] & 0xE0) != 0xC0) ? UTF8::invalid : ((bytes[0] & 0x1F) << 6) | (bytes[1] & 0x3F);
case 3: return ((bytes[0] & 0xF0) != 0xE0) ? UTF8::invalid : ((bytes[0] & 0x0F) << 12) | ((bytes[1] & 0x3F) << 6) | (bytes[2] & 0x3F);
case 4: return ((bytes[0] & 0xF8) != 0xF0) ? UTF8::invalid : ((bytes[0] & 0x07) << 18) | ((bytes[1] & 0x3F) << 12) | ((bytes[2] & 0x3F) << 6) | (bytes[3] & 0x3F);
case 1: return (((uint8_t)bytes[0] & 0x80) != 0x00) ? UTF8::invalid : (uint8_t)bytes[0];
case 2: return (((uint8_t)bytes[0] & 0xE0) != 0xC0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x1F) << 6) | ((uint8_t)bytes[1] & 0x3F);
case 3: return (((uint8_t)bytes[0] & 0xF0) != 0xE0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x0F) << 12) | (((uint8_t)bytes[1] & 0x3F) << 6) | ((uint8_t)bytes[2] & 0x3F);
case 4: return (((uint8_t)bytes[0] & 0xF8) != 0xF0) ? UTF8::invalid : (((uint8_t)bytes[0] & 0x07) << 18) | (((uint8_t)bytes[1] & 0x3F) << 12) | (((uint8_t)bytes[2] & 0x3F) << 6) | ((uint8_t)bytes[3] & 0x3F);
}
return UTF8::invalid;