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Anything that generates a delta to see if two objects are close usually isn't interested in the delta ends up being bigger than some specified size, and this allows us to stop delta generation early when that happens.
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* test-delta.c: test code to exercise diff-delta.c and patch-delta.c
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*
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* (C) 2005 Nicolas Pitre <nico@cam.org>
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*
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* This code is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "delta.h"
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static const char *usage =
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"test-delta (-d|-p) <from_file> <data_file> <out_file>";
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int main(int argc, char *argv[])
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{
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int fd;
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struct stat st;
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void *from_buf, *data_buf, *out_buf;
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unsigned long from_size, data_size, out_size;
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if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
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fprintf(stderr, "Usage: %s\n", usage);
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return 1;
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}
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fd = open(argv[2], O_RDONLY);
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if (fd < 0 || fstat(fd, &st)) {
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perror(argv[2]);
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return 1;
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}
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from_size = st.st_size;
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from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (from_buf == MAP_FAILED) {
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perror(argv[2]);
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return 1;
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}
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close(fd);
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fd = open(argv[3], O_RDONLY);
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if (fd < 0 || fstat(fd, &st)) {
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perror(argv[3]);
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return 1;
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}
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data_size = st.st_size;
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data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
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if (data_buf == MAP_FAILED) {
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perror(argv[3]);
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return 1;
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}
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close(fd);
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if (argv[1][1] == 'd')
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out_buf = diff_delta(from_buf, from_size,
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data_buf, data_size,
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&out_size, ~0UL);
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else
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out_buf = patch_delta(from_buf, from_size,
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data_buf, data_size,
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&out_size);
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if (!out_buf) {
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fprintf(stderr, "delta operation failed (returned NULL)\n");
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return 1;
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}
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fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
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if (fd < 0 || write(fd, out_buf, out_size) != out_size) {
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perror(argv[4]);
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return 1;
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}
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return 0;
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}
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