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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* compare_files.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "sqfsdiff.h"
static unsigned char old_buf[MAX_WINDOW_SIZE];
static unsigned char new_buf[MAX_WINDOW_SIZE];
int compare_files(sqfsdiff_t *sd, file_info_t *old, file_info_t *new,
const char *path)
{
char new_name[strlen(sd->new_path) + strlen(path) + 2];
char old_name[strlen(sd->old_path) + strlen(path) + 2];
int old_fd = -1, new_fd = -1, status = 0;
uint64_t offset, diff;
ssize_t ret;
if (old->size != new->size)
goto out_different;
if (sd->compare_flags & COMPARE_NO_CONTENTS)
return 0;
if (sd->old_is_dir) {
sprintf(old_name, "%s/%s", sd->old_path, path);
old_fd = open(old_name, O_RDONLY);
if (old_fd < 0) {
perror(old_name);
goto fail;
}
}
if (sd->new_is_dir) {
sprintf(new_name, "%s/%s", sd->new_path, path);
new_fd = open(new_name, O_RDONLY);
if (new_fd < 0) {
perror(new_name);
goto fail;
}
}
for (offset = 0; offset < old->size; offset += diff) {
diff = old->size - offset;
if (diff > MAX_WINDOW_SIZE)
diff = MAX_WINDOW_SIZE;
if (sd->old_is_dir) {
if (read_data_at(old_name, offset, old_fd,
old_buf, diff))
goto out;
} else {
ret = data_reader_read(sd->sqfs_old.data, old, offset,
old_buf, diff);
if (ret < 0 || (size_t)ret < diff) {
fprintf(stderr, "Failed to read %s from %s\n",
path, sd->old_path);
return -1;
}
}
if (sd->new_is_dir) {
if (read_data_at(new_name, offset, new_fd,
new_buf, diff))
goto out;
} else {
ret = data_reader_read(sd->sqfs_new.data, new, offset,
new_buf, diff);
if (ret < 0 || (size_t)ret < diff) {
fprintf(stderr, "Failed to read %s from %s\n",
path, sd->new_path);
return -1;
}
}
if (memcmp(old_buf, new_buf, diff) != 0)
goto out_different;
}
out:
if (old_fd >= 0)
close(old_fd);
if (new_fd >= 0)
close(new_fd);
return status;
fail:
status = -1;
goto out;
out_different:
if (sd->compare_flags & COMPARE_EXTRACT_FILES) {
if (extract_files(sd, old, new, path))
goto fail;
}
status = 1;
goto out;
}
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