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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* super.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "difftool.h"
static const struct {
uint16_t mask;
const char *name;
} sqfs_flags[] = {
{ SQFS_FLAG_UNCOMPRESSED_INODES, "uncompressed inodes" },
{ SQFS_FLAG_UNCOMPRESSED_DATA, "uncompressed data" },
{ SQFS_FLAG_UNCOMPRESSED_FRAGMENTS, "uncompressed fragments" },
{ SQFS_FLAG_NO_FRAGMENTS, "no fragments" },
{ SQFS_FLAG_ALWAYS_FRAGMENTS, "always fragments" },
{ SQFS_FLAG_DUPLICATES, "duplicates" },
{ SQFS_FLAG_EXPORTABLE, "exportable" },
{ SQFS_FLAG_UNCOMPRESSED_XATTRS, "uncompressed xattrs" },
{ SQFS_FLAG_NO_XATTRS, "no xattrs" },
{ SQFS_FLAG_COMPRESSOR_OPTIONS, "compressor options" },
{ SQFS_FLAG_UNCOMPRESSED_IDS, "uncompressed ids" },
};
static void print_value_difference(const char *name, uint64_t a, uint64_t b)
{
uint64_t diff;
char c;
if (a != b) {
if (a < b) {
c = '+';
diff = b - a;
} else {
c = '-';
diff = a - b;
}
fprintf(stdout, "%s: %c%lu\n", name, c, diff);
}
}
static void print_offset_diff(const char *name, uint64_t a, uint64_t b)
{
if (a != b)
fprintf(stdout, "Location of %s differs\n", name);
}
static void print_flag_diff(uint16_t a, uint16_t b)
{
uint16_t diff = a ^ b, mask;
size_t i;
char c;
if (diff == 0)
return;
fputs("flags:\n", stdout);
for (i = 0; i < sizeof(sqfs_flags) / sizeof(sqfs_flags[0]); ++i) {
if (diff & sqfs_flags[i].mask) {
c = a & sqfs_flags[i].mask ? '<' : '>';
fprintf(stdout, "\t%c%s\n", c, sqfs_flags[i].name);
}
a &= ~sqfs_flags[i].mask;
b &= ~sqfs_flags[i].mask;
diff &= ~sqfs_flags[i].mask;
}
for (i = 0, mask = 0x01; i < 16; ++i, mask <<= 1) {
if (diff & mask) {
fprintf(stdout, "\t%c additional unknown\n",
a & mask ? '<' : '>');
}
}
}
int compare_super_blocks(const sqfs_super_t *a, const sqfs_super_t *b)
{
if (memcmp(a, b, sizeof(*a)) == 0)
return 0;
fputs("======== super blocks are different ========\n", stdout);
/* TODO: if a new magic number or squashfs version is introduced,
compare them. */
print_value_difference("inode count", a->inode_count, b->inode_count);
print_value_difference("modification time", a->modification_time,
b->modification_time);
print_value_difference("block size", a->block_size, b->block_size);
print_value_difference("block log", a->block_log, b->block_log);
print_value_difference("fragment table entries",
a->fragment_entry_count,
b->fragment_entry_count);
print_value_difference("ID table entries", a->id_count, b->id_count);
if (a->compression_id != b->compression_id) {
fprintf(stdout, "compressor: %s vs %s\n",
compressor_name_from_id(a->compression_id),
compressor_name_from_id(b->compression_id));
}
print_flag_diff(a->flags, b->flags);
print_value_difference("total bytes used", a->bytes_used,
b->bytes_used);
print_offset_diff("root inode", a->root_inode_ref, b->root_inode_ref);
print_offset_diff("ID table", a->id_table_start, b->id_table_start);
print_offset_diff("xattr ID table", a->xattr_id_table_start,
b->xattr_id_table_start);
print_offset_diff("inode table", a->inode_table_start,
b->inode_table_start);
print_offset_diff("directory table", a->directory_table_start,
b->directory_table_start);
print_offset_diff("fragment table", a->fragment_table_start,
b->fragment_table_start);
print_offset_diff("export table", a->export_table_start,
b->export_table_start);
return 1;
}
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