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/*
** Copyright 2011 Double Precision, Inc.
** See COPYING for distribution information.
**
*/
#include "unicode_config.h"
#include "unicode.h"
#define BLOCK_SIZE 256
uint8_t unicode_tab_lookup(unicode_char ch,
const size_t *unicode_indextab,
size_t unicode_indextab_sizeof,
const uint8_t (*unicode_rangetab)[2],
const uint8_t *unicode_classtab,
uint8_t uclass)
{
size_t cl=ch / BLOCK_SIZE;
if (cl < unicode_indextab_sizeof-1)
{
const size_t start_pos=unicode_indextab[cl];
const uint8_t (*p)[2]=unicode_rangetab + start_pos;
size_t b=0, e=unicode_indextab[cl+1] - start_pos;
uint8_t chmodcl= ch & (BLOCK_SIZE-1);
while (b < e)
{
size_t n=b + (e-b)/2;
if (chmodcl >= p[n][0])
{
if (chmodcl <= p[n][1])
{
uclass=unicode_classtab[start_pos+n];
break;
}
b=n+1;
}
else
{
e=n;
}
}
}
return uclass;
}
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