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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* fill_files.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "rdsquashfs.h"
static struct file_ent {
char *path;
const sqfs_inode_generic_t *inode;
} *files = NULL;
static size_t num_files = 0, max_files = 0;
static size_t block_size = 0;
static int compare_files(const void *l, const void *r)
{
sqfs_u32 lhs_frag_idx, lhs_frag_off, rhs_frag_idx, rhs_frag_off;
sqfs_u64 lhs_size, rhs_size, lhs_start, rhs_start;
const struct file_ent *lhs = l, *rhs = r;
sqfs_inode_get_frag_location(lhs->inode, &lhs_frag_idx, &lhs_frag_off);
sqfs_inode_get_file_block_start(lhs->inode, &lhs_start);
sqfs_inode_get_file_size(lhs->inode, &lhs_size);
sqfs_inode_get_frag_location(rhs->inode, &rhs_frag_idx, &rhs_frag_off);
sqfs_inode_get_file_block_start(rhs->inode, &rhs_start);
sqfs_inode_get_file_size(rhs->inode, &rhs_size);
/* Files with fragments come first, ordered by ID.
In case of tie, files without data blocks come first,
and the others are ordered by start block. */
if ((lhs_size % block_size) && (lhs_frag_off < block_size) &&
(lhs_frag_idx != 0xFFFFFFFF)) {
if ((rhs_size % block_size) && (rhs_frag_off < block_size) &&
(rhs_frag_idx != 0xFFFFFFFF))
return -1;
if (lhs_frag_idx < rhs_frag_idx)
return -1;
if (lhs_frag_idx > rhs_frag_idx)
return 1;
if (lhs_size < block_size)
return (rhs_size < block_size) ? 0 : -1;
if (rhs_size < block_size)
return 1;
goto order_by_start;
}
if ((rhs_size % block_size) && (rhs_frag_off < block_size) &&
(rhs_frag_idx != 0xFFFFFFFF))
return 1;
/* order the rest by start block */
order_by_start:
return lhs_start < rhs_start ? -1 : lhs_start > rhs_start ? 1 : 0;
}
static int add_file(const sqfs_tree_node_t *node)
{
struct file_ent *new;
size_t new_sz;
char *path;
int ret;
if (num_files == max_files) {
new_sz = max_files ? max_files * 2 : 256;
new = realloc(files, sizeof(files[0]) * new_sz);
if (new == NULL) {
perror("expanding file list");
return -1;
}
files = new;
max_files = new_sz;
}
ret = sqfs_tree_node_get_path(node, &path);
if (ret != 0) {
sqfs_perror(NULL, "assembling file path", ret);
return -1;
}
if (canonicalize_name(path)) {
fprintf(stderr, "Invalid file path '%s'\n", path);
sqfs_free(path);
return -1;
}
files[num_files].path = path;
files[num_files].inode = node->inode;
num_files++;
return 0;
}
static void clear_file_list(void)
{
size_t i;
for (i = 0; i < num_files; ++i)
sqfs_free(files[i].path);
free(files);
files = NULL;
num_files = 0;
max_files = 0;
}
static int gen_file_list_dfs(const sqfs_tree_node_t *n)
{
if (!is_filename_sane((const char *)n->name, true)) {
fprintf(stderr, "Found an entry named '%s', skipping.\n",
n->name);
return 0;
}
if (S_ISREG(n->inode->base.mode))
return add_file(n);
if (S_ISDIR(n->inode->base.mode)) {
for (n = n->children; n != NULL; n = n->next) {
if (gen_file_list_dfs(n))
return -1;
}
}
return 0;
}
static int fill_files(sqfs_data_reader_t *data, int flags)
{
int ret, openflags;
sqfs_ostream_t *fp;
sqfs_istream_t *in;
size_t i;
openflags = SQFS_FILE_OPEN_OVERWRITE;
if (flags & UNPACK_NO_SPARSE)
openflags |= SQFS_FILE_OPEN_NO_SPARSE;
for (i = 0; i < num_files; ++i) {
ret = sqfs_ostream_open_file(&fp, files[i].path, openflags);
if (ret) {
sqfs_perror(files[i].path, NULL, ret);
return -1;
}
if (!(flags & UNPACK_QUIET))
printf("unpacking %s\n", files[i].path);
ret = sqfs_data_reader_create_stream(data, files[i].inode,
files[i].path, &in);
if (ret) {
sqfs_perror(files[i].path, NULL, ret);
return -1;
}
do {
ret = sqfs_istream_splice(in, fp, block_size);
} while (ret > 0);
sqfs_drop(in);
if (ret == 0)
ret = fp->flush(fp);
if (ret) {
sqfs_perror(files[i].path, "unpacking", ret);
sqfs_drop(fp);
return -1;
}
sqfs_drop(fp);
}
return 0;
}
int fill_unpacked_files(size_t blk_sz, const sqfs_tree_node_t *root,
sqfs_data_reader_t *data, int flags)
{
int status;
block_size = blk_sz;
if (gen_file_list_dfs(root)) {
clear_file_list();
return -1;
}
qsort(files, num_files, sizeof(files[0]), compare_files);
status = fill_files(data, flags);
clear_file_list();
return status;
}
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