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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-s]")
#define CONV(ITYPE, SITYPE, OTYPE, EXPONENT, HA2EXPONENT, FRACTION)\
do {\
static int cache_i = 0;\
static ITYPE cache_in[] = {0, 0, 0, 0};\
static OTYPE cache_out[] = {0, 0, 0, 0};\
ITYPE exponent, fraction, signb;\
SITYPE sexponent;\
OTYPE ret, dexponent;\
if (portable == cache_in[cache_i]) {\
ret = cache_out[cache_i++];\
cache_i &= 3;\
return ret;\
}\
cache_in[cache_i] = portable;\
signb = portable >> (EXPONENT + FRACTION);\
exponent = (portable >> FRACTION) ^ (signb << EXPONENT);\
fraction = portable & (((ITYPE)1 << FRACTION) - 1);\
if (!exponent) {\
if (!fraction) {\
ret = (OTYPE)0.0;\
} else {\
sexponent = 1 - HA2EXPONENT - FRACTION;\
dexponent = (OTYPE)sexponent;\
ret = (OTYPE)fraction;\
ret *= pow((OTYPE)2.0, dexponent);\
}\
} else if (exponent + 1 == (ITYPE)1 << EXPONENT) {\
ret = (OTYPE)(fraction ? NAN : INFINITY);\
} else {\
fraction |= (ITYPE)1 << FRACTION;\
sexponent = (SITYPE)exponent;\
sexponent -= HA2EXPONENT + FRACTION;\
dexponent = (OTYPE)sexponent;\
ret = (OTYPE)fraction;\
ret *= pow((OTYPE)2.0, dexponent);\
}\
ret = signb ? -ret : ret;\
cache_out[cache_i++] = ret;\
cache_i &= 3;\
return ret;\
} while (0)
#define PROCESS(ITYPE, OTYPE, BITS)\
do {\
size_t i, n;\
ITYPE *ibuf = (ITYPE *)(stream->buf);\
OTYPE *obuf = sizeof(ITYPE) == sizeof(OTYPE) ? (OTYPE *)(stream->buf)\
: alloca(sizeof(stream->buf) / sizeof(ITYPE) * sizeof(OTYPE));\
strict *= !USING_BINARY##BITS;\
if (!strict && sizeof(ITYPE) != sizeof(OTYPE))\
eprintf("-s is required on this machine\n");\
do {\
n = stream->ptr / sizeof(ITYPE);\
if (strict) {\
for (i = 0; i < n; i++)\
obuf[i] = conv_##OTYPE(le##BITS##toh(ibuf[i]));\
} else {\
for (i = 0; i < n; i++)\
obuf[i] = *(OTYPE *)&(ITYPE){le##BITS##toh(ibuf[i])};\
}\
ewriteall(STDOUT_FILENO, obuf, n * sizeof(OTYPE), "<stdout>");\
n *= sizeof(ITYPE);\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
if (stream->ptr)\
eprintf("%s: incomplete frame\n", stream->file);\
} while (0)
static double conv_double(uint64_t portable) {CONV(uint64_t, int64_t, double, 11, 1023, 52);}
static float conv_float (uint32_t portable) {CONV(uint32_t, int32_t, float, 8, 127, 23);}
static void process_lf(struct stream *stream, int strict) {PROCESS(uint64_t, double, 64);}
static void process_f (struct stream *stream, int strict) {PROCESS(uint32_t, float, 32);}
int
main(int argc, char *argv[])
{
struct stream stream;
int strict = 1;
void (*process)(struct stream *stream, int strict);
ARGBEGIN {
case 's':
strict = 0;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
if (stream.encoding == DOUBLE)
process = process_lf;
else if (stream.encoding == FLOAT)
process = process_f;
else
eprintf("pixel format %s is not supported\n", stream.pixfmt);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process(&stream, strict);
return 0;
}
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