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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* write_dir.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "meta_writer.h"
#include "util.h"
#include <assert.h>
#include <endian.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static int get_type(mode_t mode)
{
switch (mode & S_IFMT) {
case S_IFSOCK: return SQFS_INODE_SOCKET;
case S_IFIFO: return SQFS_INODE_FIFO;
case S_IFLNK: return SQFS_INODE_SLINK;
case S_IFBLK: return SQFS_INODE_BDEV;
case S_IFCHR: return SQFS_INODE_CDEV;
case S_IFDIR: return SQFS_INODE_DIR;
case S_IFREG: return SQFS_INODE_FILE;
default:
assert(0);
}
}
static int dir_index_grow(dir_index_t **index)
{
size_t size = sizeof(dir_index_t) + sizeof(idx_ref_t) * 10;
void *new;
if (*index == NULL) {
new = calloc(1, size);
} else {
if ((*index)->num_nodes < (*index)->max_nodes)
return 0;
size += sizeof(idx_ref_t) * (*index)->num_nodes;
new = realloc(*index, size);
}
if (new == NULL) {
perror("creating directory index");
return -1;
}
*index = new;
(*index)->max_nodes += 10;
return 0;
}
int meta_writer_write_dir(meta_writer_t *dm, dir_info_t *dir,
dir_index_t **index)
{
size_t i, size, count;
sqfs_dir_header_t hdr;
sqfs_dir_entry_t ent;
tree_node_t *c, *d;
uint16_t *diff_u16;
uint32_t offset;
uint64_t block;
int32_t diff;
c = dir->children;
dir->size = 0;
meta_writer_get_position(dm, &dir->start_block, &dir->block_offset);
while (c != NULL) {
meta_writer_get_position(dm, &block, &offset);
count = 0;
size = (offset + sizeof(hdr)) % SQFS_META_BLOCK_SIZE;
for (d = c; d != NULL; d = d->next) {
if ((d->inode_ref >> 16) != (c->inode_ref >> 16))
break;
diff = d->inode_num - c->inode_num;
if (diff > 32767 || diff < -32767)
break;
size += sizeof(ent) + strlen(c->name);
if (count > 0 && size > SQFS_META_BLOCK_SIZE)
break;
count += 1;
}
if (count > SQFS_MAX_DIR_ENT)
count = SQFS_MAX_DIR_ENT;
if (dir_index_grow(index))
return -1;
meta_writer_get_position(dm, &block, &offset);
i = (*index)->num_nodes++;
(*index)->idx_nodes[i].node = c;
(*index)->idx_nodes[i].block = block;
(*index)->idx_nodes[i].index = dir->size;
hdr.count = htole32(count - 1);
hdr.start_block = htole32(c->inode_ref >> 16);
hdr.inode_number = htole32(c->inode_num);
dir->size += sizeof(hdr);
if (meta_writer_append(dm, &hdr, sizeof(hdr)))
return -1;
d = c;
for (i = 0; i < count; ++i) {
ent.inode_diff = c->inode_num - d->inode_num;
diff_u16 = (uint16_t *)&ent.inode_diff;
*diff_u16 = htole16(*diff_u16);
ent.offset = htole16(c->inode_ref & 0x0000FFFF);
ent.type = htole16(get_type(c->mode));
ent.size = htole16(strlen(c->name) - 1);
dir->size += sizeof(ent) + strlen(c->name);
if (meta_writer_append(dm, &ent, sizeof(ent)))
return -1;
if (meta_writer_append(dm, c->name, strlen(c->name)))
return -1;
c = c->next;
}
}
return 0;
}
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