#include <stdio.h>
#include <limits.h>

#include "pack.h"

/* Integer packing. */
#define DEFPACK_BE(bits, type) void pack_ ## bits ## _be ( \
	unsigned char *out, type v \
) { \
	unsigned i; \
	for (i = 1; i <= bits/8; i++) { \
		out[bits/8 - i] = v % 256; \
		v /= 256; \
	} \
}

#define DEFPACK_LE(bits, type) void pack_ ## bits ## _le ( \
	unsigned char *out, type v \
) { \
	unsigned i; \
	for (i = 0; i < bits/8; i++) { \
		out[i] = v % 256; \
		v /= 256; \
	} \
}

DEFPACK_BE(16, unsigned short)
DEFPACK_BE(32, unsigned long)
#ifdef ULLONG_MAX
DEFPACK_BE(64, unsigned long long)
#endif

DEFPACK_LE(16, unsigned short)
DEFPACK_LE(32, unsigned long)
#ifdef ULLONG_MAX
DEFPACK_LE(64, unsigned long long)
#endif

#define DEFUNPACK_BE(bits, type) type unpack_ ## bits ## _be ( \
	unsigned char *in \
) { \
	type v = 0; \
	unsigned i; \
	for (i = 0; i < bits/8; i++) { \
		v *= 256; \
		v += in[i]; \
	} \
	return v; \
}

#define DEFUNPACK_LE(bits, type) type unpack_ ## bits ## _le ( \
	unsigned char *in \
) { \
	type v = 0; \
	unsigned i; \
	for (i = 1; i <= bits/8; i++) { \
		v *= 256; \
		v += in[bits/8 - i]; \
	} \
	return v; \
}

DEFUNPACK_BE(16, unsigned short)
DEFUNPACK_BE(32, unsigned long)
#ifdef ULLONG_MAX
DEFUNPACK_BE(64, unsigned long long)
#endif

DEFUNPACK_LE(16, unsigned short)
DEFUNPACK_LE(32, unsigned long)
#ifdef ULLONG_MAX
DEFUNPACK_LE(64, unsigned long long)
#endif