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adds new apis

#include <stdio.h>
#include <string.h>
#include <elwix.h>


int
main(int argc, char **argv)
{
	rpack_t *rp;
	register int i;
	char n8 = '*';
	short n16 = 0xdeba;
	int n32 = 0xdeadbeef;
	long long int n64 = 0x123456789abcdef0;

	if (argc < 2)
		return 1;

	rp = rpack_create(argv[1], strlen(argv[1]) + 1);
	if (!rp) {
		printf("#%d - %s\n", elwix_GetErrno(), elwix_GetError());
		return 2;
	} else
		printf("create raw packet %p -> %s(%d)\n", rp, rp->r_buf, rp->r_len);

	printf("test rpack_uint8::\n");
	for (i = 0; i < RPACK_LEN(rp); i++)
		if (i == 4)
			printf("\t%d) %c\n", i, rpack_uint8(rp, (uint8_t*) &n8));
		else
			printf("\t%d) %c\n", i, rpack_uint8(rp, NULL));
	RPACK_REWIND(rp);
	for (i = 0; i < RPACK_LEN(rp); i++)
		printf("\t%d) %c\n", i, rpack_uint8(rp, NULL));
	RPACK_REWIND(rp);

	printf("test rpack_uint16::\n");
	for (i = 0; i < RPACK_LEN(rp); i++)
		if (i == 4)
			printf("\t%d) %x\n", i, rpack_uint16(rp, (uint16_t*) &n16));
		else
			printf("\t%d) %x\n", i, rpack_uint16(rp, NULL));
	RPACK_REWIND(rp);
	for (i = 0; i < RPACK_LEN(rp); i++)
		printf("\t%d) %x\n", i, rpack_uint16(rp, NULL));
	RPACK_REWIND(rp);

	printf("test rpack_uint24::\n");
	for (i = 0; i < RPACK_LEN(rp); i++)
		if (i == 4)
			printf("\t%d) %x\n", i, rpack_uint24(rp, (uint32_t*) &n32));
		else
			printf("\t%d) %x\n", i, rpack_uint24(rp, NULL));
	RPACK_REWIND(rp);
	for (i = 0; i < RPACK_LEN(rp); i++)
		printf("\t%d) %x\n", i, rpack_uint24(rp, NULL));
	RPACK_REWIND(rp);

	printf("test rpack_uint32::\n");
	for (i = 0; i < RPACK_LEN(rp); i++)
		if (i == 4)
			printf("\t%d) %x\n", i, rpack_uint32(rp, (uint32_t*) &n32));
		else
			printf("\t%d) %x\n", i, rpack_uint32(rp, NULL));
	RPACK_REWIND(rp);
	for (i = 0; i < RPACK_LEN(rp); i++)
		printf("\t%d) %x\n", i, rpack_uint32(rp, NULL));
	RPACK_REWIND(rp);

	rpack_destroy(&rp);
	printf("destroy packet %p\n", rp);
	return 0;
}