/* * test-delta.c: test code to exercise diff-delta.c and patch-delta.c * * (C) 2005 Nicolas Pitre <nico@cam.org> * * This code is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <stdio.h> #include <unistd.h> #include <string.h> #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/mman.h> #include "delta.h" static const char usage[] = "test-delta (-d|-p) <from_file> <data_file> <out_file>"; int main(int argc, char *argv[]) { int fd; struct stat st; void *from_buf, *data_buf, *out_buf; unsigned long from_size, data_size, out_size; if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) { fprintf(stderr, "Usage: %s\n", usage); return 1; } fd = open(argv[2], O_RDONLY); if (fd < 0 || fstat(fd, &st)) { perror(argv[2]); return 1; } from_size = st.st_size; from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0); if (from_buf == MAP_FAILED) { perror(argv[2]); close(fd); return 1; } close(fd); fd = open(argv[3], O_RDONLY); if (fd < 0 || fstat(fd, &st)) { perror(argv[3]); return 1; } data_size = st.st_size; data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0); if (data_buf == MAP_FAILED) { perror(argv[3]); close(fd); return 1; } close(fd); if (argv[1][1] == 'd') out_buf = diff_delta(from_buf, from_size, data_buf, data_size, &out_size, 0); else out_buf = patch_delta(from_buf, from_size, data_buf, data_size, &out_size); if (!out_buf) { fprintf(stderr, "delta operation failed (returned NULL)\n"); return 1; } fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666); if (fd < 0 || write(fd, out_buf, out_size) != out_size) { perror(argv[4]); return 1; } return 0; }