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/*
Copyright (C) 2003 Razvan Cojocaru <[email protected]>
Most of the code in this file is a modified version of code from
Pabs' GPL chmdeco project, credits and thanks go to him.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define UINT16ARRAY(x) ((unsigned char)(x)[0] | ((u_int16_t)(x)[1] << 8))
#define UINT32ARRAY(x) (UINT16ARRAY(x) | ((u_int32_t)(x)[2] << 16) \
| ((u_int32_t)(x)[3] << 24))
inline unsigned int get_int32_le( void *addr)
{
unsigned char *p = (unsigned char*) addr;
return (unsigned int) ( p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24) );
}
inline u_int64_t be_encint(unsigned char* buffer, size_t& length)
{
u_int64_t result = 0;
int shift=0;
length = 0;
do {
result |= ((*buffer) & 0x7f) << shift;
shift += 7;
++length;
} while (*(buffer++) & 0x80);
return result;
}
/*
Finds the first unset bit in memory. Returns the number of set bits found.
Returns -1 if the buffer runs out before we find an unset bit.
*/
inline int ffus(unsigned char* byte, int* bit, size_t& length)
{
int bits = 0;
length = 0;
while(*byte & (1 << *bit)){
if(*bit)
--(*bit);
else {
++byte;
++length;
*bit = 7;
}
++bits;
}
if(*bit)
--(*bit);
else {
++length;
*bit = 7;
}
return bits;
}
inline u_int64_t sr_int(unsigned char* byte, int* bit,
unsigned char s, unsigned char r, size_t& length)
{
u_int64_t ret;
unsigned char mask;
int n, n_bits, num_bits, base, count;
length = 0;
size_t fflen;
if(!bit || *bit > 7 || s != 2)
return ~(u_int64_t)0;
ret = 0;
count = ffus(byte, bit, fflen);
length += fflen;
byte += length;
n_bits = n = r + (count ? count-1 : 0) ;
while(n > 0) {
num_bits = n > *bit ? *bit : n-1;
base = n > *bit ? 0 : *bit - (n-1);
switch(num_bits){
case 0:
mask = 1;
break;
case 1:
mask = 3;
break;
case 2:
mask = 7;
break;
case 3:
mask = 0xf;
break;
case 4:
mask = 0x1f;
break;
case 5:
mask = 0x3f;
break;
case 6:
mask = 0x7f;
break;
case 7:
mask = 0xff;
break;
default:
mask = 0xff;
break;
}
mask <<= base;
ret = (ret << (num_bits+1)) |
(u_int64_t)((*byte & mask) >> base);
if( n > *bit ){
++byte;
++length;
n -= *bit+1;
*bit = 7;
} else {
*bit -= n;
n = 0;
}
}
if(count)
ret |= (u_int64_t)1 << n_bits;
return ret;
}
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