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/* Copyright (c) 1993-2008 by Richard Kelsey and Jonathan Rees.
See file COPYING. */
/*
* This file defines functions for dealing with a synthetic text
* encoding called UTF-8. It's like UTF-8, but also encodes unpaired
* surrogates directly, which is what we need for the Windows API.
*/
#include <windows.h>
static char masks[4] = { 0x7f, 0x1f, 0x0f, 0x07 };
/*
* - NUL-terminates
* - if utf_8of16 is NULL, we just compute the size
* - returns size (sans NUL) needed for UTF-8of16
*/
int
s48_utf_16_to_utf_8of16(LPWSTR utf_16,
unsigned char* utf_8of16)
{
int p = 0, i = 0;
while (utf_16[i])
{
unsigned int c = utf_16[i];
++i;
if ((c >= 0xD800) && (c <= 0xDBFF) /* high surrogate */
&& utf_16[i]
&& (utf_16[i] >= 0xDC00) && (utf_16[i] <= 0xDFFF)) /* low surrogate */
{
c = ((c - 0xd7c0) << 10) + (utf_16[i] & 0x3ff);
++i;
}
if (c <= 0x7f)
{
if (utf_8of16)
utf_8of16[p] = (unsigned char) c;
++p;
}
else if (c <= 0x7ff)
{
if (utf_8of16)
{
utf_8of16[p] = (unsigned char) ((c >> 6) + 0xc0);
utf_8of16[p+1] = (unsigned char) ((c & 0x3f) + 0x80);
}
p += 2;
}
else if (c <= 0xffff)
{
if (utf_8of16)
{
utf_8of16[p] = (unsigned char) ((c >> 12) + 0xe0);
utf_8of16[p+1] = (unsigned char) (((c >> 6) & 0x3f) + 0x80);
utf_8of16[p+2] = (unsigned char) ((c & 0x3f) + 0x80);
}
p += 3;
}
else
{
if (utf_8of16)
{
utf_8of16[p] = (unsigned char) ((c >> 18) + 0xf0);
utf_8of16[p+1] = (unsigned char) (((c >> 12) + 0xe0) + 0x80);
utf_8of16[p+2] = (unsigned char) (((c >> 6) & 0x3f) + 0x80);
utf_8of16[p+3] = (unsigned char) ((c & 0x3f) + 0x80);
}
p += 4;
}
}
if (utf_8of16)
utf_8of16[p] = 0;
return p;
}
/*
* The table, and the associated decoding algorithm, is from
* Richard Gillam: "Unicode Demystified", chapter 14
*/
static char states[3][32] =
{
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 2, 2, 3, -1},
{-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 0, 0, 0, 0, 0, 0, 0, 0, -2, -2, -2, -2, -2, -2, -2, -2},
{-2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, 1, 1, 1, 1, 1, 1, 1, 1, -2, -2, -2, -2, -2, -2, -2, -2},
};
/*
* - NUL-terminates
* - if utf_6 is NULL, we just compute the size
* - returns size (sans NUL) needed for UTF-16
*/
int
s48_utf_8of16_to_utf_16(const unsigned char* utf_8of16,
LPWSTR utf_16,
int* errorp)
{
int p = 0, q = 0, state = 0, error = 0;
unsigned int scalar_value = 0;
unsigned mask = 0;
while (utf_8of16[q])
{
unsigned char c = utf_8of16[q];
++q;
state = states[state][c >> 3];
switch (state) {
case 0:
scalar_value += c & 0x7f;
if (scalar_value > 0xffff)
{
if (utf_16)
{
utf_16[p] = (scalar_value >> 10) + 0xD7C0;
utf_16[p+1] = (scalar_value & 0x3FF) + 0xDC00;
}
p += 2;
}
else
{
if (utf_16)
utf_16[p] = scalar_value;
++p;
}
scalar_value = 0;
mask = 0;
break;
case 1:
case 2:
if (mask == 0)
mask = masks[state];
scalar_value = (scalar_value + (c & mask)) << 6;
mask = 0x3f;
break;
case -2:
--q;
/* fall thru */
case -1:
if (utf_16)
utf_16[p] = 0xfffd;
++p;
scalar_value = 0;
state = 0;
mask = 0;
error = 1;
break;
}
}
if (errorp)
*errorp = error;
if (utf_16)
utf_16[p] = 0;
return p;
}
/*
#include <stdlib.h>
#include <stdio.h>
int
main(void)
{
unsigned int t1[] = { 'A', 'B', 0xd800, 0xd900, 0xdfff, 'C', 'D', 0 };
int size_8 = s48_utf_16_to_utf_8of16(t1, NULL);
printf("size_8 %d\n", size_8);
unsigned char c[1000];
size_8 = s48_utf_16_to_utf_8of16(t1, c);
printf("size_8 %d\n", size_8);
{
int i = 0;
while (i < size_8)
{
printf("%d: %4x\n", i, c[i]);
++i;
}
}
unsigned int u[1000];
int error;
int size_16 = s48_utf_8of16_to_utf_16(c, NULL, &error);
printf("size_16 %d\n", size_16);
size_16 = s48_utf_8of16_to_utf_16(c, u, &error);
printf("size_16 %d\n", size_16);
{
int i = 0;
while (i < size_16)
{
printf("%d: %4x\n", i, u[i]);
++i;
}
}
}
*/
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