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byteorder.c
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byteorder.c
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/* byteorder.c
* Copyright: 2001-2003 The Perl Foundation. All Rights Reserved.
* CVS Info
* $Id$
* Overview:
* Byteordering functions
* These are assigned to a vtable in PackFile at each load.
* If the vtable method is called for conversion from the
* native byteorder, it is a noop and will work, but the
* caller should know if the PackFile byteorder is native
* and skip the conversion and just map it in.
* Data Structure and Algorithms:
* History:
* Initial version by Melvin on 2002/05/1
* Notes:
* References:
*/
#include "parrot/parrot.h"
/*
* Byte order handlers.
*/
/*
* Configure should have checked for supported word sizes
*/
/* fetch_iv_le
* This function converts a 4 or 8 byte INTVAL into little
* endian format. If the native format is already little
* endian, then no conversion is done.
*/
INTVAL
fetch_iv_le(INTVAL w)
{
#if !PARROT_BIGENDIAN
return w;
#else
# if INTVAL_SIZE == 4
return (w << 24) | ((w & 0xff00) << 8) | ((w & 0xff0000) >> 8) | (w >> 24);
# else
INTVAL r;
r = w << 56;
r |= (w & 0xff00) << 40;
r |= (w & 0xff0000) << 24;
r |= (w & 0xff000000) << 8;
r |= (w & 0xff00000000) >> 8;
r |= (w & 0xff0000000000) >> 24;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/* fetch_iv_be
* This function converts a 4 or 8 byte INTVAL into big
* endian format. If the native format is already big
* endian, then no conversion is done.
*/
INTVAL
fetch_iv_be(INTVAL w)
{
#if PARROT_BIGENDIAN
return w;
#else
# if INTVAL_SIZE == 4
return (w << 24) | ((w & 0xff00) << 8) | ((w & 0xff0000) >> 8) | (w >> 24);
# else
INTVAL r;
r = w << 56;
r |= (w & 0xff00) << 40;
r |= (w & 0xff0000) << 24;
r |= (w & 0xff000000) << 8;
r |= (w & 0xff00000000) >> 8;
r |= (w & 0xff0000000000) >> 24;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
* Same as above for opcode_t
*/
opcode_t
fetch_op_be(opcode_t w)
{
#if PARROT_BIGENDIAN
return w;
#else
# if OPCODE_T_SIZE == 4
return (w << 24) | ((w & 0x0000ff00) << 8) | ((w & 0x00ff0000) >> 8) |
((w & 0xff000000) >> 24);
# else
opcode_t r;
r = w << 56;
r |= (w & 0xff00) << 40;
r |= (w & 0xff0000) << 24;
r |= (w & 0xff000000) << 8;
r |= (w & 0xff00000000) >> 8;
r |= (w & 0xff0000000000) >> 24;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
opcode_t
fetch_op_le(opcode_t w)
{
#if !PARROT_BIGENDIAN
return w;
#else
# if OPCODE_T_SIZE == 4
return (w << 24) | ((w & 0x0000ff00) << 8) | ((w & 0x00ff0000) >> 8) |
((w & 0xff000000) >> 24);
# else
opcode_t r;
r = w << 56;
r |= (w & 0xff00) << 40;
r |= (w & 0xff0000) << 24;
r |= (w & 0xff000000) << 8;
r |= (w & 0xff00000000) >> 8;
r |= (w & 0xff0000000000) >> 24;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
* Unrolled routines for swapping various sizes from 32-128 bits
* These should only be used if alignment is unknown or we are
* pulling something out of a padded buffer.
*/
void
fetch_buf_be_4(unsigned char *rb, unsigned char *b)
{
#if PARROT_BIGENDIAN
memcpy(rb, b, 4);
#else
rb[0] = b[3];
rb[1] = b[2];
rb[2] = b[1];
rb[3] = b[0];
#endif
}
void
fetch_buf_le_4(unsigned char *rb, unsigned char *b)
{
#if !PARROT_BIGENDIAN
memcpy(rb, b, 4);
#else
rb[0] = b[3];
rb[1] = b[2];
rb[2] = b[1];
rb[3] = b[0];
#endif
}
void
fetch_buf_be_8(unsigned char *rb, unsigned char *b)
{
#if PARROT_BIGENDIAN
memcpy(rb, b, 8);
#else
rb[0] = b[7];
rb[1] = b[6];
rb[2] = b[5];
rb[3] = b[4];
rb[4] = b[3];
rb[5] = b[2];
rb[6] = b[1];
rb[7] = b[0];
#endif
}
void
fetch_buf_le_8(unsigned char *rb, unsigned char *b)
{
#if !PARROT_BIGENDIAN
memcpy(rb, b, 8);
#else
rb[0] = b[7];
rb[1] = b[6];
rb[2] = b[5];
rb[3] = b[4];
rb[4] = b[3];
rb[5] = b[2];
rb[6] = b[1];
rb[7] = b[0];
#endif
}
void
fetch_buf_le_12(unsigned char *rb, unsigned char *b)
{
#if !PARROT_BIGENDIAN
memcpy(rb, b, 12);
#else
rb[0] = b[11];
rb[1] = b[10];
rb[2] = b[9];
rb[3] = b[8];
rb[4] = b[7];
rb[5] = b[6];
rb[6] = b[5];
rb[7] = b[4];
rb[8] = b[3];
rb[9] = b[2];
rb[10] = b[1];
rb[11] = b[0];
#endif
}
void
fetch_buf_be_12(unsigned char *rb, unsigned char *b)
{
#if PARROT_BIGENDIAN
memcpy(rb, b, 12);
#else
rb[0] = b[11];
rb[1] = b[10];
rb[2] = b[9];
rb[3] = b[8];
rb[4] = b[7];
rb[5] = b[6];
rb[6] = b[5];
rb[7] = b[4];
rb[8] = b[3];
rb[9] = b[2];
rb[10] = b[1];
rb[11] = b[0];
#endif
}
void
fetch_buf_le_16(unsigned char *rb, unsigned char *b)
{
#if !PARROT_BIGENDIAN
memcpy(rb, b, 16);
#else
rb[0] = b[15];
rb[1] = b[14];
rb[2] = b[13];
rb[3] = b[12];
rb[4] = b[11];
rb[5] = b[10];
rb[6] = b[9];
rb[7] = b[8];
rb[8] = b[7];
rb[9] = b[6];
rb[10] = b[5];
rb[11] = b[4];
rb[12] = b[3];
rb[13] = b[2];
rb[14] = b[1];
rb[15] = b[0];
#endif
}
void
fetch_buf_be_16(unsigned char *rb, unsigned char *b)
{
#if PARROT_BIGENDIAN
memcpy(rb, b, 16);
#else
rb[0] = b[15];
rb[1] = b[14];
rb[2] = b[13];
rb[3] = b[12];
rb[4] = b[11];
rb[5] = b[10];
rb[6] = b[9];
rb[7] = b[8];
rb[8] = b[7];
rb[9] = b[6];
rb[10] = b[5];
rb[11] = b[4];
rb[12] = b[3];
rb[13] = b[2];
rb[14] = b[1];
rb[15] = b[0];
#endif
}
/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*
* vim: expandtab shiftwidth=4:
*/