dwarf_leb.c revision 49d3bc91e27cd871b950d56c01398fa2f2e12ab4
/*
Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
under the terms of version 2.1 of the GNU Lesser General Public License
as published by the Free Software Foundation.
This program is distributed in the hope that it would be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Further, this software is distributed without any warranty that it is
free of the rightful claim of any third person regarding infringement
or the like. Any license provided herein, whether implied or
otherwise, applies only to this software file. Patent licenses, if
any, provided herein do not apply to combinations of this program with
other software, or any other product whatsoever.
You should have received a copy of the GNU Lesser General Public
License along with this program; if not, write the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
USA.
Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pky,
Mountain View, CA 94043, or:
For further information regarding this notice, see:
*/
#include "config.h"
#include "dwarf_incl.h"
#include <stdio.h>
/*
decode ULEB
*/
{
unsigned char byte;
/* The following unrolls-the-loop for the first few bytes and
unpacks into 32 bits to make this as fast as possible.
word_number is assumed big enough that the shift has a defined
result. */
if ((*leb128 & 0x80) == 0) {
if (leb128_length != NULL)
*leb128_length = 1;
return (*leb128);
if (leb128_length != NULL)
*leb128_length = 2;
return (word_number);
if (leb128_length != NULL)
*leb128_length = 3;
return (word_number);
if (leb128_length != NULL)
*leb128_length = 4;
return (word_number);
}
/* The rest handles long numbers Because the 'number' may be
before the shift for the shift to have a defined result. */
number = 0;
shift = 0;
byte_length = 1;
for (;;) {
if ((byte & 0x80) == 0) {
if (leb128_length != NULL)
return (number);
}
shift += 7;
byte_length++;
++leb128;
}
}
#define BITSINBYTE 8
/*
decode SLEB
*/
{
Dwarf_Signed number = 0;
Dwarf_Bool sign = 0;
Dwarf_Sword shift = 0;
/* byte_length being the number of bytes of data absorbed so far in
turning the leb into a Dwarf_Signed. */
for (;;) {
shift += 7;
if ((byte & 0x80) == 0) {
break;
}
++leb128;
byte_length++;
}
}
if (leb128_length != NULL)
return (number);
}