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#include <BH/String.h>
#include <BH/Util.h>
#include "Inline/Unicode.h"
uint32_t decodeUtf8(uint32_t *unit,
unsigned char *state,
unsigned char byte)
{
unsigned char type, bits;
type = lookupUtf8Type[(size_t)byte];
bits = lookupUtf8Bits[(size_t)type];
*unit = (*unit << bits) | ((0xFF >> (8 - bits)) & byte);
return *state = lookupUtf8State[(size_t)type + *state];
}
uint32_t BH_UnicodeLower(uint32_t unit)
{
size_t i;
/* In convertable range */
if (unit >= 0xFFFF)
return unit;
/* Fasttrack and search lookup table */
i = lookupLowerIndex[unit >> 8];
while (i < sizeof(lookupLower) / sizeof(struct CaseMap))
{
if (lookupLower[i].from > unit)
return unit;
if (lookupLower[i].from == unit)
return lookupLower[i].to;
i++;
}
return unit;
}
uint32_t BH_UnicodeUpper(uint32_t unit)
{
size_t i;
/* In convertable range */
if (unit >= 0xFFFF)
return unit;
/* Fasttrack and search lookup table */
i = lookupUpperIndex[unit >> 8];
while (i < sizeof(lookupUpper) / sizeof(struct CaseMap))
{
if (lookupUpper[i].from > unit)
return unit;
if (lookupUpper[i].from == unit)
return lookupUpper[i].to;
i++;
}
return unit;
}
size_t BH_UnicodeDecodeUtf8(const char *string,
size_t size,
uint32_t *unit)
{
unsigned char state;
size_t i;
state = 0;
*unit = 0;
for (i = 0; i < size; i++)
{
switch (decodeUtf8(unit, &state, string[i]))
{
case UTF8_OK: return i + 1;
case UTF8_ERROR: *unit = 0xFFFFFFFF; return (i > 0 ? i : i + 1);
default: break;
}
}
return 0;
}
size_t BH_UnicodeEncodeUtf8(uint32_t unit,
char *string)
{
size_t result;
if (unit > 0xD7FF && unit < 0xE000)
return 0;
result = 0;
if (unit < 0x80ul)
{
string[0] = unit & 0x7F;
result = 1;
}
else if (unit < 0x800ul)
{
string[0] = 0xC0 | (unit >> 6);
string[1] = 0x80 | (unit & 0x3F);
result = 2;
}
else if (unit < 0x10000ul)
{
string[0] = 0xE0 | (unit >> 12);
string[1] = 0x80 | ((unit >> 6) & 0x3F);
string[2] = 0x80 | (unit & 0x3F);
result = 3;
}
else if (unit < 0x200000ul)
{
string[0] = 0xF0 | (unit >> 18);
string[1] = 0x80 | ((unit >> 12) & 0x3F);
string[2] = 0x80 | ((unit >> 6) & 0x3F);
string[3] = 0x80 | (unit & 0x3F);
result = 4;
}
return result;
}
static int classifyUtf16(uint16_t value)
{
if (value > 0xD7FF && value < 0xDC00)
return UTF16_LOWSUR;
else if (value > 0xDBFF && value < 0xE000)
return UTF16_HIGHSUR;
return UTF16_NORMAL;
}
size_t BH_UnicodeDecodeUtf16LE(const char *string,
size_t size,
uint32_t *unit)
{
uint16_t lower, upper;
if (size < 2)
return 0;
upper = BH_Read16LEu(string);
*unit = 0xFFFFFFFF;
if (classifyUtf16(upper) == UTF16_NORMAL)
*unit = upper;
else if (classifyUtf16(upper) == UTF16_LOWSUR)
{
if (size < 4)
return 0;
lower = BH_Read16LEu(string + 2);
if (classifyUtf16(lower) == UTF16_HIGHSUR)
{
*unit = (((upper & 0x3FF) << 10) | (lower & 0x3FF)) + 0x10000;
return 4;
}
}
return 2;
}
size_t BH_UnicodeDecodeUtf16BE(const char *string,
size_t size,
uint32_t *unit)
{
uint16_t lower, upper;
if (size < 2)
return 0;
upper = BH_Read16BEu(string);
*unit = 0xFFFFFFFF;
if (classifyUtf16(upper) == UTF16_NORMAL)
*unit = upper;
else if (classifyUtf16(upper) == UTF16_LOWSUR)
{
if (size < 4)
return 0;
lower = BH_Read16BEu(string + 2);
if (classifyUtf16(lower) == UTF16_HIGHSUR)
{
*unit = (((upper & 0x3FF) << 10) | (lower & 0x3FF)) + 0x10000;
return 4;
}
}
return 2;
}
size_t BH_UnicodeEncodeUtf16LE(uint32_t unit,
char *string)
{
if (unit > 0xD7FF && unit < 0xE000)
return 0;
if (unit < 0x10000)
{
BH_Write16LEu(string, unit);
return 2;
}
else if (unit < 0x200000)
{
unit -= 0x10000;
BH_Write16LEu(string, 0xD800 | (unit >> 10));
BH_Write16LEu(string + 2, 0xDC00 | (unit & 0x3FF));
return 4;
}
return 0;
}
size_t BH_UnicodeEncodeUtf16BE(uint32_t unit,
char *string)
{
if (unit > 0xD7FF && unit < 0xE000)
return 0;
if (unit < 0x10000)
{
BH_Write16BEu(string, unit);
return 2;
}
else if (unit < 0x200000)
{
unit -= 0x10000;
BH_Write16BEu(string, 0xD800 | (unit >> 10));
BH_Write16BEu(string + 2, 0xDC00 | (unit & 0x3FF));
return 4;
}
return 0;
}
size_t BH_UnicodeDecodeUtf32LE(const char *string,
size_t size,
uint32_t *unit)
{
if (size < 4)
return 0;
*unit = BH_Read32LEu(string);
return 4;
}
size_t BH_UnicodeDecodeUtf32BE(const char *string,
size_t size,
uint32_t *unit)
{
if (size < 4)
return 0;
*unit = BH_Read32BEu(string);
return 4;
}
size_t BH_UnicodeEncodeUtf32LE(uint32_t unit,
char *string)
{
if (unit > 0x1FFFFF || (unit > 0xD7FF && unit < 0xE000))
return 0;
BH_Write32LEu(string, unit);
return 4;
}
size_t BH_UnicodeEncodeUtf32BE(uint32_t unit,
char *string)
{
if (unit > 0x1FFFFF || (unit > 0xD7FF && unit < 0xE000))
return 0;
BH_Write32BEu(string, unit);
return 4;
}
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