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/*
* This file is part of RUfl
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license
* Copyright 2005 James Bursa <james@semichrome.net>
*/
#include "rufl_internal.h"
/**
* Test if a character set contains a character.
*
* \param charset character set
* \param u Unicode codepoint
* \return true if present, false if absent
*/
bool rufl_character_set_test(const struct rufl_character_set *charset,
uint32_t u)
{
unsigned int plane = u >> 16;
unsigned int block = (u >> 8) & 0xff;
unsigned int byte = (u >> 3) & 31;
unsigned int bit = u & 7;
if (17 <= plane)
return false;
/* Look for the plane we want */
while (PLANE_ID(charset->metadata) != plane &&
EXTENSION_FOLLOWS(charset->metadata)) {
charset = (void *)(((uint8_t *)charset) +
PLANE_SIZE(charset->metadata));
}
if (PLANE_ID(charset->metadata) != plane)
return false;
if (charset->index[block] == BLOCK_EMPTY)
return false;
else if (charset->index[block] == BLOCK_FULL)
return true;
else {
uint8_t z = charset->block[charset->index[block]][byte];
return z & (1 << bit);
}
}
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