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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* compare_files.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "difftool.h"
static unsigned char a_buf[MAX_WINDOW_SIZE];
static unsigned char b_buf[MAX_WINDOW_SIZE];
int compare_files(file_info_t *a, file_info_t *b, const char *path)
{
char second_name[strlen(second_path) + strlen(path) + 2];
char first_name[strlen(first_path) + strlen(path) + 2];
int afd = -1, bfd = -1, status = 0;
uint64_t offset, diff;
ssize_t ret;
if (a->size != b->size)
goto out_different;
if (compare_flags & COMPARE_NO_CONTENTS)
return 0;
if (a_is_dir) {
sprintf(first_name, "%s/%s", first_path, path);
afd = open(first_name, O_RDONLY);
if (afd < 0) {
perror(first_name);
goto fail;
}
}
if (b_is_dir) {
sprintf(second_name, "%s/%s", second_path, path);
bfd = open(second_name, O_RDONLY);
if (bfd < 0) {
perror(second_name);
goto fail;
}
}
for (offset = 0; offset < a->size; offset += diff) {
diff = a->size - offset;
if (diff > MAX_WINDOW_SIZE)
diff = MAX_WINDOW_SIZE;
if (a_is_dir) {
if (read_data_at(first_name, offset, afd, a_buf, diff))
goto out;
} else {
ret = data_reader_read(sqfs_a.data, a, offset,
a_buf, diff);
if (ret < 0 || (size_t)ret < diff) {
fprintf(stderr, "Failed to read %s from %s\n",
path, first_path);
return -1;
}
}
if (b_is_dir) {
if (read_data_at(second_name, offset, bfd, b_buf, diff))
goto out;
} else {
ret = data_reader_read(sqfs_b.data, b, offset,
b_buf, diff);
if (ret < 0 || (size_t)ret < diff) {
fprintf(stderr, "Failed to read %s from %s\n",
path, second_path);
return -1;
}
}
if (memcmp(a_buf, b_buf, diff) != 0)
goto out_different;
}
out:
if (afd >= 0)
close(afd);
if (bfd >= 0)
close(bfd);
return status;
fail:
status = -1;
goto out;
out_different:
if (compare_flags & COMPARE_EXTRACT_FILES) {
if (extract_files(a, b, path))
goto fail;
}
status = 1;
goto out;
}
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