femtolisp/llt/bswap.c

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C
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#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <alloca.h>
#include "dtypes.h"
#include "utils.h"
void bswap_buffer(byte_t *data, size_t sz, size_t npts)
{
size_t i, b;
byte_t *el;
byte_t temp;
if (sz <= 1)
return;
switch (sz) {
case 8:
for(i=0; i < npts; i++) {
((u_int64_t*)data)[i] = bswap_64(((u_int64_t*)data)[i]);
}
break;
case 4:
for(i=0; i < npts; i++) {
((u_int32_t*)data)[i] = bswap_32(((u_int32_t*)data)[i]);
}
break;
case 2:
for(i=0; i < npts; i++) {
((u_int16_t*)data)[i] = bswap_16(((u_int16_t*)data)[i]);
}
break;
default:
for(i=0; i < sz * npts; i += sz) {
el = data + i;
for(b=0; b < sz/2; b++) {
temp = el[b];
el[b] = el[sz-b-1];
el[sz-b-1] = temp;
}
}
}
}
void bswap(byte_t *s, size_t n)
{
unsigned int i;
char temp;
switch (n) {
case 8:
*(u_int64_t*)s = bswap_64(*(u_int64_t*)s); break;
case 4:
*(u_int32_t*)s = bswap_32(*(u_int32_t*)s); break;
case 2:
*(u_int16_t*)s = bswap_16(*(u_int16_t*)s); break;
case 1:
break;
default:
for(i=0; i < n/2; i++) {
temp = s[i];
s[i] = s[n-i-1];
s[n-i-1] = temp;
}
}
}
void bswap_to(byte_t *dest, byte_t *src, size_t n)
{
unsigned int i;
switch (n) {
case 8:
*(u_int64_t*)dest = bswap_64(*(u_int64_t*)src); break;
case 4:
*(u_int32_t*)dest = bswap_32(*(u_int32_t*)src); break;
case 2:
*(u_int16_t*)dest = bswap_16(*(u_int16_t*)src); break;
case 1:
break;
default:
for(i=0; i < n; i++) {
dest[i] = src[n-i-1];
}
}
}