#include <stdio.h>
#include <stdlib.h>
#include <elf.h>
#include <fcntl.h>
#include <sys/endian.h>

int main(int argc, char *argv[])
{
	int fd1, fd2, big_endian = 0;
	Elf32_Ehdr ehdr;
	char buf[512];

	if (argc != 3) {
		printf("usage: %s input-file output-file\n", argv[1]);
		exit(1);
	}
	fd1 = open(argv[1], O_RDONLY);
	if (fd1 < 0) {
		printf("Error: couldn't open %s\n", argv[1]);
		exit(1);
	}
	if (read(fd1, &ehdr, sizeof(ehdr)) != sizeof(ehdr)) {
		printf("Error: couldn't read the ELF header\n");
		exit(1);
	}
	if (ehdr.e_machine != htole16(EM_ARM)) {
		if (ehdr.e_machine != htobe16(EM_ARM)) {
			printf("Error: Not an ARM ELF binary.\n");
			exit(1);
		} else
			big_endian = 1;
	} else
		big_endian = 0;
	if (big_endian) {
		ehdr.e_flags &= ~htobe32(0x200); /* Remove FPA Soft float */
		ehdr.e_flags |= htobe32(0x400); /* VFP Soft Float */
	} else {
		ehdr.e_flags &= ~htole32(0x200); /* Remove FPA Soft float */
		ehdr.e_flags |= htole32(0x400); /* VFP Soft Float */

	}
	fd2 = open(argv[2], O_WRONLY|O_CREAT|O_TRUNC, 0755);
	if (fd2 < 0) {
		printf("Error: couldn't open %s for writing\n", argv[2]);
		exit(1);
	}
	write(fd2, &ehdr, sizeof(ehdr));
	while (read(fd1, buf, sizeof(buf)) > 0)
		write(fd2, buf, sizeof(buf));
	
}