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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* frag_table.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#define SQFS_BUILDING_DLL
#include "config.h"
#include "sqfs/frag_table.h"
#include "sqfs/super.h"
#include "sqfs/table.h"
#include "sqfs/error.h"
#include "sqfs/block.h"
#include "compat.h"
#include <stdlib.h>
#include <string.h>
struct sqfs_frag_table_t {
sqfs_object_t base;
size_t capacity;
size_t used;
sqfs_fragment_t *table;
};
static void frag_table_destroy(sqfs_object_t *obj)
{
sqfs_frag_table_t *tbl = (sqfs_frag_table_t *)obj;
free(tbl->table);
free(tbl);
}
static sqfs_object_t *frag_table_copy(const sqfs_object_t *obj)
{
const sqfs_frag_table_t *tbl = (const sqfs_frag_table_t *)obj;
sqfs_frag_table_t *copy;
copy = malloc(sizeof(*copy));
if (copy == NULL)
return NULL;
memcpy(copy, tbl, sizeof(*tbl));
return (sqfs_object_t *)copy;
}
sqfs_frag_table_t *sqfs_frag_table_create(sqfs_u32 flags)
{
sqfs_frag_table_t *tbl;
if (flags != 0)
return NULL;
tbl = calloc(1, sizeof(*tbl));
if (tbl == NULL)
return NULL;
((sqfs_object_t *)tbl)->copy = frag_table_copy;
((sqfs_object_t *)tbl)->destroy = frag_table_destroy;
return tbl;
}
int sqfs_frag_table_read(sqfs_frag_table_t *tbl, sqfs_file_t *file,
const sqfs_super_t *super, sqfs_compressor_t *cmp)
{
sqfs_u64 location, lower, upper;
void *raw = NULL;
size_t size;
int err;
free(tbl->table);
tbl->table = NULL;
tbl->capacity = 0;
tbl->used = 0;
if (super->flags & SQFS_FLAG_NO_FRAGMENTS)
return 0;
if (super->fragment_table_start == 0xFFFFFFFFFFFFFFFFUL)
return 0;
if (super->fragment_entry_count == 0)
return 0;
if (super->fragment_table_start >= super->bytes_used)
return SQFS_ERROR_OUT_OF_BOUNDS;
/* location must be after inode & directory table,
but before the ID table */
if (super->fragment_table_start < super->directory_table_start)
return SQFS_ERROR_CORRUPTED;
if (super->fragment_table_start >= super->id_table_start)
return SQFS_ERROR_CORRUPTED;
location = super->fragment_table_start;
lower = super->directory_table_start;
upper = super->id_table_start;
if (super->export_table_start < super->id_table_start)
upper = super->export_table_start;
if (SZ_MUL_OV(super->fragment_entry_count, sizeof(sqfs_fragment_t),
&size)) {
return SQFS_ERROR_OVERFLOW;
}
err = sqfs_read_table(file, cmp, size, location, lower, upper, &raw);
if (err) {
free(raw);
return err;
}
tbl->table = raw;
tbl->capacity = super->fragment_entry_count;
tbl->used = super->fragment_entry_count;
return 0;
}
int sqfs_frag_table_write(sqfs_frag_table_t *tbl, sqfs_file_t *file,
sqfs_super_t *super, sqfs_compressor_t *cmp)
{
size_t i;
int err;
if (tbl->used == 0) {
super->fragment_table_start = 0xFFFFFFFFFFFFFFFF;
super->flags |= SQFS_FLAG_NO_FRAGMENTS;
super->flags &= ~SQFS_FLAG_ALWAYS_FRAGMENTS;
super->flags &= ~SQFS_FLAG_UNCOMPRESSED_FRAGMENTS;
return 0;
}
err = sqfs_write_table(file, cmp, tbl->table,
sizeof(tbl->table[0]) * tbl->used,
&super->fragment_table_start);
if (err)
return err;
super->fragment_entry_count = tbl->used;
super->flags &= ~SQFS_FLAG_NO_FRAGMENTS;
super->flags |= SQFS_FLAG_ALWAYS_FRAGMENTS;
super->flags |= SQFS_FLAG_UNCOMPRESSED_FRAGMENTS;
for (i = 0; i < tbl->used; ++i) {
if (SQFS_IS_BLOCK_COMPRESSED(le32toh(tbl->table[i].size))) {
super->flags &= ~SQFS_FLAG_UNCOMPRESSED_FRAGMENTS;
break;
}
}
return 0;
}
int sqfs_frag_table_lookup(sqfs_frag_table_t *tbl, sqfs_u32 index,
sqfs_fragment_t *out)
{
if (index >= tbl->used)
return SQFS_ERROR_OUT_OF_BOUNDS;
out->start_offset = le64toh(tbl->table[index].start_offset);
out->size = le32toh(tbl->table[index].size);
out->pad0 = le32toh(tbl->table[index].pad0);
return 0;
}
int sqfs_frag_table_append(sqfs_frag_table_t *tbl, sqfs_u64 location,
sqfs_u32 size, sqfs_u32 *index)
{
size_t new_sz, total;
void *new;
if (tbl->used == tbl->capacity) {
new_sz = tbl->capacity ? tbl->capacity * 2 : 128;
if (SZ_MUL_OV(new_sz, sizeof(tbl->table[0]), &total))
return SQFS_ERROR_OVERFLOW;
new = realloc(tbl->table, total);
if (new == NULL)
return SQFS_ERROR_ALLOC;
tbl->capacity = new_sz;
tbl->table = new;
}
if (index != NULL)
*index = tbl->used;
memset(tbl->table + tbl->used, 0, sizeof(tbl->table[0]));
tbl->table[tbl->used].start_offset = htole64(location);
tbl->table[tbl->used].size = htole32(size);
tbl->used += 1;
return 0;
}
int sqfs_frag_table_set(sqfs_frag_table_t *tbl, sqfs_u32 index,
sqfs_u64 location, sqfs_u32 size)
{
if (index >= tbl->used)
return SQFS_ERROR_OUT_OF_BOUNDS;
tbl->table[index].start_offset = htole64(location);
tbl->table[index].size = htole32(size);
return 0;
}
size_t sqfs_frag_table_get_size(sqfs_frag_table_t *tbl)
{
return tbl->used;
}
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