/* src/vm/suck.h - functions to read LE ordered types from a buffer

   Copyright (C) 1996-2005 R. Grafl, A. Krall, C. Kruegel, C. Oates,
   R. Obermaisser, M. Platter, M. Probst, S. Ring, E. Steiner,
   C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich, J. Wenninger,
   Institut f. Computersprachen - TU Wien

   This file is part of CACAO.

   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, 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., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.

   Contact: cacao@complang.tuwien.ac.at

   Authors: Christian Thalinger

   Changes:

   $Id: suck.h 3876 2005-12-05 19:03:54Z twisti $

*/


#ifndef _SUCK_H
#define _SUCK_H

#include "config.h"
#include "vm/types.h"

#include "vm/class.h"
#include "vm/loader.h"


/* macros to read LE and BE types from a buffer ********************************

   BE macros are for class file loading.
   LE macros are for ZIP file loading.

*******************************************************************************/

#if WORDS_BIGENDIAN == 0

/* we can optimize the LE access on little endian machines */

#define SUCK_LE_U1(p)    *((u1 *) (p))
#define SUCK_LE_U2(p)    *((u2 *) (p))
#define SUCK_LE_U4(p)    *((u4 *) (p))

#if U8_AVAILABLE == 1
#define SUCK_LE_U8(p)    *((u8 *) (p))
#endif

#define SUCK_BE_U1(p) \
      ((u1) (p)[0])

#define SUCK_BE_U2(p) \
    ((((u2) (p)[0]) << 8) + \
      ((u2) (p)[1]))

#define SUCK_BE_U4(p) \
    ((((u4) (p)[0]) << 24) + \
     (((u4) (p)[1]) << 16) + \
     (((u4) (p)[2]) << 8) + \
      ((u4) (p)[3]))

#if U8_AVAILABLE == 1
#define SUCK_BE_U8(p) \
    ((((u8) (p)[0]) << 56) + \
     (((u8) (p)[1]) << 48) + \
     (((u8) (p)[2]) << 40) + \
     (((u8) (p)[3]) << 32) + \
     (((u8) (p)[4]) << 24) + \
     (((u8) (p)[5]) << 16) + \
     (((u8) (p)[6]) << 8) + \
      ((u8) (p)[7]))
#endif

#else /* WORDS_BIGENDIAN == 0 */

#define SUCK_LE_U1(p) \
      ((u1) (p)[0])

#define SUCK_LE_U2(p) \
    ((((u2) (p)[1]) << 8) + \
      ((u2) (p)[0]))

#define SUCK_LE_U4(p) \
    ((((u4) (p)[3]) << 24) + \
     (((u4) (p)[2]) << 16) + \
     (((u4) (p)[1]) << 8) + \
      ((u4) (p)[0]))

#if U8_AVAILABLE == 1
#define SUCK_LE_U8(p) \
    ((((u8) (p)[7]) << 56) + \
     (((u8) (p)[6]) << 48) + \
     (((u8) (p)[5]) << 40) + \
     (((u8) (p)[4]) << 32) + \
     (((u8) (p)[3]) << 24) + \
     (((u8) (p)[2]) << 16) + \
     (((u8) (p)[1]) << 8) + \
      ((u8) (p)[0]))
#endif

/* we can optimize the BE access on big endian machines */

#if defined(__MIPS__)

/* MIPS needs aligned access */

#define SUCK_BE_U1(p) \
      ((u1) (p)[0])

#define SUCK_BE_U2(p) \
    ((((u2) (p)[0]) << 8) + \
      ((u2) (p)[1]))

#define SUCK_BE_U4(p) \
    ((((u4) (p)[0]) << 24) + \
     (((u4) (p)[1]) << 16) + \
     (((u4) (p)[2]) << 8) + \
      ((u4) (p)[3]))

#if U8_AVAILABLE == 1
#define SUCK_BE_U8(p) \
    ((((u8) (p)[0]) << 56) + \
     (((u8) (p)[1]) << 48) + \
     (((u8) (p)[2]) << 40) + \
     (((u8) (p)[3]) << 32) + \
     (((u8) (p)[4]) << 24) + \
     (((u8) (p)[5]) << 16) + \
     (((u8) (p)[6]) << 8) + \
      ((u8) (p)[7]))
#endif

#else /* defined(__MIPS__) */

#define SUCK_BE_U1(p)    *((u1 *) (p))
#define SUCK_BE_U2(p)    *((u2 *) (p))
#define SUCK_BE_U4(p)    *((u4 *) (p))

#if U8_AVAILABLE == 1
#define SUCK_BE_U8(p)    *((u8 *) (p))
#endif

#endif /* defined(__MIPS__) */

#endif /* WORDS_BIGENDIAN == 0 */


/* signed suck defines ********************************************************/

#define suck_s1(a)    (s1) suck_u1((a))
#define suck_s2(a)    (s2) suck_u2((a))
#define suck_s4(a)    (s4) suck_u4((a))
#define suck_s8(a)    (s8) suck_u8((a))


/* function prototypes ********************************************************/

bool suck_init(char *classpath);

bool suck_check_classbuffer_size(classbuffer *cb, s4 len);

u1 suck_u1(classbuffer *cb);
u2 suck_u2(classbuffer *cb);
u4 suck_u4(classbuffer *cb);
u8 suck_u8(classbuffer *cb);

float suck_float(classbuffer *cb);
double suck_double(classbuffer *cb);

void suck_nbytes(u1 *buffer, classbuffer *cb, s4 len);
void suck_skip_nbytes(classbuffer *cb, s4 len);

classbuffer *suck_start(classinfo *c);

void suck_stop(classbuffer *cb);

#endif /* _SUCK_H */

/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 */