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Kernel: Cleanup GPT parsing code

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Bananymous
2023-03-23 11:13:14 +02:00
parent 4ffc69a6e4
commit 74949401bd
4 changed files with 84 additions and 90 deletions
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51
BAN/include/BAN/UTF8.h
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@@ -3,15 +3,12 @@
#include <stddef.h>
#include <stdint.h>
namespace BAN
namespace BAN::UTF8
{
namespace UTF8
{
static constexpr uint32_t invalid = 0xFFFFFFFF;
}
static constexpr uint32_t invalid = 0xFFFFFFFF;
static constexpr uint32_t utf8_byte_length(uint8_t first_byte)
constexpr uint32_t byte_length(uint8_t first_byte)
{
if ((first_byte & 0x80) == 0x00)
return 1;
@@ -24,9 +21,9 @@ namespace BAN
return 0;
}
static constexpr uint32_t utf8_to_codepoint(uint8_t* bytes)
constexpr uint32_t to_codepoint(uint8_t* bytes)
{
uint32_t length = utf8_byte_length(bytes[0]);
uint32_t length = byte_length(bytes[0]);
for (uint32_t i = 1; i < length; i++)
if ((bytes[i] & 0xC0) != 0x80)
@@ -43,4 +40,42 @@ namespace BAN
return UTF8::invalid;
}
template<typename T>
constexpr bool from_codepoints(const T* codepoints, size_t count, char* out)
{
uint8_t* ptr = (uint8_t*)out;
for (size_t i = 0; i < count; i++)
{
if (codepoints[i] < 0x80)
{
*ptr++ = codepoints[i];
}
else if (codepoints[i] < 0x800)
{
*ptr++ = 0xC0 | ((codepoints[i] >> 6) & 0x1F);
*ptr++ = 0x80 | ((codepoints[i] >> 0) & 0x3F);
}
else if (codepoints[i] < 0x10000)
{
*ptr++ = 0xE0 | ((codepoints[i] >> 12) & 0x0F);
*ptr++ = 0x80 | ((codepoints[i] >> 6) & 0x3F);
*ptr++ = 0x80 | ((codepoints[i] >> 0) & 0x3F);
}
else if (codepoints[i] < 0x110000)
{
*ptr++ = 0xF0 | ((codepoints[i] >> 18) & 0x07);
*ptr++ = 0x80 | ((codepoints[i] >> 12) & 0x3F);
*ptr++ = 0x80 | ((codepoints[i] >> 6) & 0x3F);
*ptr++ = 0x80 | ((codepoints[i] >> 0) & 0x3F);
}
else
{
return false;
}
}
return true;
}
}