/usr/bin/avos:AOS check file()

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Description

This function is responsible for validating an .aos file. It returns zero if the file is valid, -1 otherwise.

References To

• AOS_verify_magic()
• AOS_compare_SIGx_checksum()

The Code

uint64_t AOS_file_length; // global variable
 
int AOS_check_file(char *pathname) {
	int fd;
	int unk_1;
 
	AOS_file_offset = 0;
 
	fd = fopen(pathname, O_RDONLY, 0);
	if(fd != 0) {
 
		AOS_file_length = fseek(fd, SEEK_END, 0);
		fseek(fd, SEEK_SET, 0);
 
		if(AOS_verify_magic(fd) == 0
				&& AOS_compare_SIGx_checksum(fd) == 0) {
			fclose(fd);
			return 0; // success
		}
 
		fclose(fd);
	}
 
	return -1; // failure
}