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/*
* Copyright 2018, University Corporation for Atmospheric Research
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*/
#include "config.h"
#include "netcdf_filter_build.h"
/*
Common utilities related to filters.
Taken from libdispatch/dfilters.c.
*/
#ifdef WORDS_BIGENDIAN
/* Byte swap an 8-byte integer in place */
static void
byteswap8(unsigned char* mem)
{
unsigned char c;
c = mem[0];
mem[0] = mem[7];
mem[7] = c;
c = mem[1];
mem[1] = mem[6];
mem[6] = c;
c = mem[2];
mem[2] = mem[5];
mem[5] = c;
c = mem[3];
mem[3] = mem[4];
mem[4] = c;
}
/* Byte swap an 8-byte integer in place */
static void
byteswap4(unsigned char* mem)
{
unsigned char c;
c = mem[0];
mem[0] = mem[3];
mem[3] = c;
c = mem[1];
mem[1] = mem[2];
mem[2] = c;
}
#endif /*WORDS_BIGENDIAN*/
void
NC_h5filterspec_fix8(void* mem0, int decode)
{
#ifdef WORDS_BIGENDIAN
unsigned char* mem = mem0;
if(decode) { /* Apply inverse of the encode case */
byteswap4(mem); /* step 1: byte-swap each piece */
byteswap4(mem+4);
byteswap8(mem); /* step 2: convert to little endian format */
} else { /* encode */
byteswap8(mem); /* step 1: convert to little endian format */
byteswap4(mem); /* step 2: byte-swap each piece */
byteswap4(mem+4);
}
#else /* Little endian */
/* No action is necessary */
#endif
}
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