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#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/alloc.h>
#include <caml/compatibility.h>
#include <caml/fail.h>
#include <caml/threads.h>
#ifdef __GNUC__
#define INLINE static __inline__
#else
#define INLINE static
#endif
#define UNTESTEDENDIAN (-1)
#define LITTLEENDIAN 0
#define BIGENDIAN 1
#define UNKNOWNENDIAN (-2)
int endian = UNTESTEDENDIAN;
#define CHV(x,i) ((x>>(byte_size*(sizeof(x)-i-1)))&mask)
void test_endian(void)
{
char c, ci=0x11;
int byte_size;
int x, xi=0x11;
unsigned int mask, i;
if (endian != UNTESTEDENDIAN) return;
c=1; byte_size=0;
do { c=c<<1; byte_size++; } while(c!=0);
for (mask=0, i=1; i<=(unsigned)byte_size; i++) mask= (mask<<1)|1;
for (c=ci,i=0; i<sizeof(x); c+=ci,i++) ((char *)&x)[i]= c;
if ((CHV(x,0) == (int)(sizeof(x)*xi)) && (CHV(x,(sizeof(x)-1)) == (int)xi)) {
endian = LITTLEENDIAN;
} else if ((CHV(x,(sizeof(x)-1)) == (int)(sizeof(x)*xi)) && (CHV(x,0) == (int)xi)) {
endian = BIGENDIAN;
} else {
endian = UNKNOWNENDIAN;
}
}
INLINE void swap64( void *outp, const void *inp )
{
const char *in = (const char *)inp;
char *out = (char *)outp;
out[0] = in[7]; out[1] = in[6]; out[2] = in[5]; out[3] = in[4];
out[4] = in[3]; out[5] = in[2]; out[6] = in[1]; out[7] = in[0];
}
INLINE void swap32( void *outp, const void *inp )
{
const char *in = (const char *)inp;
char *out = (char *)outp;
out[0] = in[3]; out[1] = in[2]; out[2] = in[1]; out[3] = in[0];
}
void __i_le_32(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
int i = Int_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_32(b,_p,_i); break;
case LITTLEENDIAN: memcpy(String_val(b)+p, (char *)&i, 4); break;
case BIGENDIAN: swap32(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_be_32(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
int i = Int_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_be_32(b,_p,_i); break;
case BIGENDIAN: memcpy(String_val(b)+p, (char *)&i, 4); break;
case LITTLEENDIAN: swap32(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_le_32l(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
int i = Int32_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_32l(b,_p,_i); break;
case LITTLEENDIAN: memcpy(String_val(b)+p, (char *)&i, 4); break;
case BIGENDIAN: swap32(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_be_32l(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
int i = Int32_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_32l(b,_p,_i); break;
case LITTLEENDIAN: swap32(String_val(b)+p, (char *)&i); break;
case BIGENDIAN: memcpy(String_val(b)+p, (char *)&i, 4); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_le_64(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
long i = Long_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_64(b,_p,_i); break;
case LITTLEENDIAN: memcpy(String_val(b)+p, (char *)&i, 8); break;
case BIGENDIAN: swap64(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_be_64(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
long i = Long_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_be_64(b,_p,_i); break;
case BIGENDIAN: memcpy(String_val(b)+p, (char *)&i, 8); break;
case LITTLEENDIAN: swap64(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_le_64L(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
long i = Int64_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_64L(b,_p,_i); break;
case LITTLEENDIAN: memcpy(String_val(b)+p, (char *)&i, 8); break;
case BIGENDIAN: swap64(String_val(b)+p, (char *)&i); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
void __i_be_64L(value b, value _p, value _i)
{
CAMLparam3(b, _p, _i);
int p = Int_val(_p);
long i = Int64_val(_i);
switch (endian) {
case UNTESTEDENDIAN: test_endian(); __i_le_64L(b,_p,_i); break;
case LITTLEENDIAN: swap64(String_val(b)+p, (char *)&i); break;
case BIGENDIAN: memcpy(String_val(b)+p, (char *)&i, 8); break;
default: caml_failwith("Unknown endianness"); break;
}
CAMLreturn0;
}
/*
int main(argc, argv)
int argc; char *argv[];
{
test_endian();
switch (endian) {
case UNTESTEDENDIAN: printf("untested endian\n"); break;
case LITTLEENDIAN: printf("little endian\n"); break;
case BIGENDIAN: printf("big endian\n"); break;
default: printf("unknown endian\n"); break;
}
return(0);
}
*/
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