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byteorder.c
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byteorder.c
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/*
Copyright (C) 2001-2007, The Perl Foundation.
$Id$
=head1 NAME
src/byteorder.c - Byteordering functions
=head1 DESCRIPTION
These are assigned to a vtable when the PBC file is loaded.
If the vtable method for conversion from the native byteorder is called,
it is a I<no op> and will work, but the caller should know if the
byteorder in the PBC file is native and skip the conversion and just map
it in.
=head2 Byte order handlers
Configure will have checked for supported word sizes.
=over 4
=cut
*/
#include "parrot/parrot.h"
#include "parrot/packfile.h"
/* HEADERIZER HFILE: include/parrot/packfile.h */
/*
=item C<fetch_iv_le>
This function converts a 4 or 8 byte C<INTVAL> into little endian
format. If the native format is already little endian, then no
conversion is done.
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CONST_FUNCTION
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 & 0xff000000000000) >> 40;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
=item C<fetch_iv_be>
This function converts a 4 or 8 byte C<INTVAL> into big endian format.
If the native format is already big endian, then no conversion is done.
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CONST_FUNCTION
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 & 0xff000000000000) >> 40;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
=item C<fetch_op_be>
Same as C<fetch_iv_be> for opcode_t
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CONST_FUNCTION
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 & 0xff000000000000) >> 40;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
=item C<fetch_op_le>
Same as C<fetch_iv_le> for opcode_t
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CONST_FUNCTION
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 & 0xff000000000000) >> 40;
r |= (w & 0xff00000000000000) >> 56;
return r;
# endif
#endif
}
/*
=pod
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.
=cut
*/
/*
=item C<fetch_buf_be_4>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_be_4(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_le_4>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_le_4(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_be_8>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_be_8(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_le_8>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_le_8(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_le_12>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_le_12(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_be_12>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_be_12(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_le_16>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_le_16(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=item C<fetch_buf_be_16>
TODO: Not yet documented!!!
=cut
*/
void
fetch_buf_be_16(NOTNULL(unsigned char *rb), NOTNULL(const 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
}
/*
=back
=head1 HISTORY
Initial version by Melvin on 2002/05/01
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/