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/*
* Copyright © 2011,2012 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_UTF_PRIVATE_HH
#define HB_UTF_PRIVATE_HH
#include "hb-private.hh"
/* UTF-8 */
#define HB_UTF8_COMPUTE(Char, Mask, Len) \
if (Char < 128) { Len = 1; Mask = 0x7f; } \
else if ((Char & 0xe0) == 0xc0) { Len = 2; Mask = 0x1f; } \
else if ((Char & 0xf0) == 0xe0) { Len = 3; Mask = 0x0f; } \
else if ((Char & 0xf8) == 0xf0) { Len = 4; Mask = 0x07; } \
else Len = 0;
static inline const uint8_t *
hb_utf_next (const uint8_t *text,
const uint8_t *end,
hb_codepoint_t *unicode)
{
hb_codepoint_t c = *text, mask;
unsigned int len;
/* TODO check for overlong sequences? */
HB_UTF8_COMPUTE (c, mask, len);
if (unlikely (!len || (unsigned int) (end - text) < len)) {
*unicode = -1;
return text + 1;
} else {
hb_codepoint_t result;
unsigned int i;
result = c & mask;
for (i = 1; i < len; i++)
{
if (unlikely ((text[i] & 0xc0) != 0x80))
{
*unicode = -1;
return text + 1;
}
result <<= 6;
result |= (text[i] & 0x3f);
}
*unicode = result;
return text + len;
}
}
static inline const uint8_t *
hb_utf_prev (const uint8_t *text,
const uint8_t *start,
hb_codepoint_t *unicode)
{
const uint8_t *end = text--;
while (start < text && (*text & 0xc0) == 0x80 && end - text < 4)
text--;
hb_codepoint_t c = *text, mask;
unsigned int len;
/* TODO check for overlong sequences? */
HB_UTF8_COMPUTE (c, mask, len);
if (unlikely (!len || (unsigned int) (end - text) != len)) {
*unicode = -1;
return end - 1;
} else {
hb_codepoint_t result;
unsigned int i;
result = c & mask;
for (i = 1; i < len; i++)
{
result <<= 6;
result |= (text[i] & 0x3f);
}
*unicode = result;
return text;
}
}
static inline unsigned int
hb_utf_strlen (const uint8_t *text)
{
return strlen ((const char *) text);
}
/* UTF-16 */
static inline const uint16_t *
hb_utf_next (const uint16_t *text,
const uint16_t *end,
hb_codepoint_t *unicode)
{
hb_codepoint_t c = *text++;
if (unlikely (hb_in_range<hb_codepoint_t> (c, 0xd800, 0xdbff)))
{
/* high surrogate */
hb_codepoint_t l;
if (text < end && ((l = *text), likely (hb_in_range<hb_codepoint_t> (l, 0xdc00, 0xdfff))))
{
/* low surrogate */
*unicode = (c << 10) + l - ((0xd800 << 10) - 0x10000 + 0xdc00);
text++;
} else
*unicode = -1;
} else
*unicode = c;
return text;
}
static inline const uint16_t *
hb_utf_prev (const uint16_t *text,
const uint16_t *start,
hb_codepoint_t *unicode)
{
hb_codepoint_t c = *--text;
if (unlikely (hb_in_range<hb_codepoint_t> (c, 0xdc00, 0xdfff)))
{
/* low surrogate */
hb_codepoint_t h;
if (start < text && ((h = *(text - 1)), likely (hb_in_range<hb_codepoint_t> (h, 0xd800, 0xdbff))))
{
/* high surrogate */
*unicode = (h << 10) + c - ((0xd800 << 10) - 0x10000 + 0xdc00);
text--;
} else
*unicode = -1;
} else
*unicode = c;
return text;
}
static inline unsigned int
hb_utf_strlen (const uint16_t *text)
{
unsigned int l = 0;
while (*text++) l++;
return l;
}
/* UTF-32 */
static inline const uint32_t *
hb_utf_next (const uint32_t *text,
const uint32_t *end HB_UNUSED,
hb_codepoint_t *unicode)
{
*unicode = *text++;
return text;
}
static inline const uint32_t *
hb_utf_prev (const uint32_t *text,
const uint32_t *start HB_UNUSED,
hb_codepoint_t *unicode)
{
*unicode = *--text;
return text;
}
static inline unsigned int
hb_utf_strlen (const uint32_t *text)
{
unsigned int l = 0;
while (*text++) l++;
return l;
}
#endif /* HB_UTF_PRIVATE_HH */
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