mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 02:33:36 +08:00
132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Written by Ulrich Drepper, <drepper@cygnus.com>.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
/* Find index of weight. */
|
|
static inline int32_t
|
|
findidx (const unsigned char **cpp)
|
|
{
|
|
int_fast32_t i = table[*(*cpp)++];
|
|
const unsigned char *cp;
|
|
const unsigned char *usrc;
|
|
|
|
if (i >= 0)
|
|
/* This is an index into the weight table. Cool. */
|
|
return i;
|
|
|
|
/* Oh well, more than one sequence starting with this byte.
|
|
Search for the correct one. */
|
|
cp = &extra[-i];
|
|
usrc = *cpp;
|
|
while (1)
|
|
{
|
|
size_t nhere;
|
|
|
|
/* The first thing is the index. */
|
|
i = *((int32_t *) cp);
|
|
cp += sizeof (int32_t);
|
|
|
|
/* Next is the length of the byte sequence. These are always
|
|
short byte sequences so there is no reason to call any
|
|
function (even if they are inlined). */
|
|
nhere = *cp++;
|
|
|
|
if (i >= 0)
|
|
{
|
|
/* It is a single character. If it matches we found our
|
|
index. Note that at the end of each list there is an
|
|
entry of length zero which represents the single byte
|
|
sequence. The first (and here only) byte was tested
|
|
already. */
|
|
size_t cnt;
|
|
|
|
for (cnt = 0; cnt < nhere; ++cnt)
|
|
if (cp[cnt] != usrc[cnt])
|
|
break;
|
|
|
|
if (cnt == nhere)
|
|
{
|
|
/* Found it. */
|
|
*cpp += nhere;
|
|
return i;
|
|
}
|
|
|
|
/* Up to the next entry. */
|
|
cp += nhere;
|
|
if ((1 + nhere) % __alignof__ (int32_t) != 0)
|
|
cp += __alignof__ (int32_t) - (1 + nhere) % __alignof__ (int32_t);
|
|
}
|
|
else
|
|
{
|
|
/* This is a range of characters. First decide whether the
|
|
current byte sequence lies in the range. */
|
|
size_t cnt;
|
|
size_t offset = 0;
|
|
|
|
for (cnt = 0; cnt < nhere; ++cnt)
|
|
if (cp[cnt] != usrc[cnt])
|
|
break;
|
|
|
|
if (cnt != nhere)
|
|
{
|
|
if (cp[cnt] > usrc[cnt])
|
|
{
|
|
/* Cannot be in this range. */
|
|
cp += 2 * nhere;
|
|
if ((1 + 2 * nhere) % __alignof__ (int32_t) != 0)
|
|
cp += (__alignof__ (int32_t)
|
|
- (1 + 2 * nhere) % __alignof__ (int32_t));
|
|
continue;
|
|
}
|
|
|
|
/* Test against the end of the range. */
|
|
for (cnt = 0; cnt < nhere; ++cnt)
|
|
if (cp[nhere + cnt] != usrc[cnt])
|
|
break;
|
|
|
|
if (cnt != nhere && cp[nhere + cnt] < usrc[cnt])
|
|
{
|
|
/* Cannot be in this range. */
|
|
cp += 2 * nhere;
|
|
if ((1 + 2 * nhere) % __alignof__ (int32_t) != 0)
|
|
cp += (__alignof__ (int32_t)
|
|
- (1 + 2 * nhere) % __alignof__ (int32_t));
|
|
continue;
|
|
}
|
|
|
|
/* This range matches the next characters. Now find
|
|
the offset in the indirect table. */
|
|
for (cnt = 0; cp[cnt] == usrc[cnt]; ++cnt);
|
|
|
|
do
|
|
{
|
|
offset <<= 8;
|
|
offset += usrc[cnt] - cp[cnt];
|
|
}
|
|
while (++cnt < nhere);
|
|
}
|
|
|
|
*cpp += nhere;
|
|
return indirect[-i + offset];
|
|
}
|
|
}
|
|
|
|
/* NOTREACHED */
|
|
return 0x43219876;
|
|
}
|