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#include "uniconv.h"
#include "unicode.h"
int
unicode_valide(uc_char_t unichar)
{
return ((unichar) < 0x110000 &&
(((unichar) & 0xFFFFF800) != 0xD800) &&
((unichar) < 0xFDD0 || (unichar) > 0xFDEF) &&
((unichar) & 0xFFFE) != 0xFFFE);
}
int
ucs4toutf16(uc_char_t unichar, uc_uint16_t *utf16)
{
unsigned len;
if (unichar < 0x10000)
{
len = 1;
}
else
{
len = 2;
}
if (utf16)
{
if (len == 1) {
utf16[0] = unichar;
} else {
utf16[0] = (unichar - 0x10000) / 0x400 + 0xd800;
utf16[1] = (unichar - 0x10000) % 0x400 + 0xdc00;
}
}
return len;
}
int
ucs4fromutf16(const uc_uint16_t *utf16, uc_char_t *ret, int inlen)
{
static const uc_char_t UNI_SUR_HIGH_START = 0xd800;
static const uc_char_t UNI_SUR_HIGH_END = 0xdbff;
static const uc_char_t UNI_SUR_LOW_START = 0xdc00;
static const uc_char_t UNI_SUR_LOW_END = 0xdfff;
uc_char_t ch;
int len = 1;
ch = utf16[0];
if (ch >= UNI_SUR_HIGH_START && ch <= UNI_SUR_HIGH_END) {
uc_char_t ch2;
if (inlen < 2)
return -2;
ch2 = utf16[1];
if (ch2 >= UNI_SUR_LOW_START && ch2 <= UNI_SUR_LOW_END) {
len++;
ch = (ch - UNI_SUR_HIGH_START) << 10;
ch += ch2 - UNI_SUR_LOW_START + 0x0010000;
} else {
return -1;
}
}
if (ret)
*ret = ch;
return len;
}
int
ucs4toutf8(uc_char_t unichar, char *utf8)
{
int prefix;
int i;
unsigned len;
if (unichar < 0x80)
{
prefix = 0;
len = 1;
}
else if (unichar < 0x800)
{
prefix = 0xc0;
len = 2;
}
else if (unichar < 0x10000)
{
prefix = 0xe0;
len = 3;
}
else if (unichar < 0x200000)
{
prefix = 0xf0;
len = 4;
}
else if (unichar < 0x4000000)
{
prefix = 0xf8;
len = 5;
}
else
{
prefix = 0xfc;
len = 6;
}
if (utf8)
{
for (i = len - 1; i > 0; --i)
{
utf8[i] = (unichar & 0x3f) | 0x80;
unichar >>= 6;
}
utf8[0] = unichar | prefix;
}
return len;
}
int ucs4fromutf8 (const char * str, uc_char_t * ucs4, int len)
{
const unsigned char * utf8 = (const unsigned char *)str;
unsigned char c;
unsigned char mask;
int i;
int seqlen;
uc_char_t result;
c = *utf8;
if (c < 0x80)
{
result = c;
mask = 0x7f;
seqlen = 1;
}
else if ((c & 0xe0) == 0xc0)
{
mask = 0x1f;
seqlen = 2;
}
else if ((c & 0xf0) == 0xe0)
{
mask = 0x0f;
seqlen = 3;
}
else if ((c & 0xf8) == 0xf0)
{
mask = 0x07;
seqlen = 4;
}
else if ((c & 0xfc) == 0xf8)
{
mask = 0x03;
seqlen = 5;
}
else if ((c & 0xfe) == 0xfc)
{
mask = 0x01;
seqlen = 6;
}
else
{
return -1;
}
if (len < seqlen)
return -2;
result = c & mask;
for (i = 1; i < seqlen; i++)
{
c = (unsigned char)utf8[i];
if ((c & 0xc0) != 0x80)
{
return -1;
}
result <<= 6;
result |= c & 0x3f;
}
if (!unicode_valide(result))
return -1;
if (ucs4toutf8(result, NULL) != seqlen)
return -1;
if (ucs4)
*ucs4 = result;
return seqlen;
}
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