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-rw-r--r--lib/sqfshelper/write_inode.c327
1 files changed, 327 insertions, 0 deletions
diff --git a/lib/sqfshelper/write_inode.c b/lib/sqfshelper/write_inode.c
new file mode 100644
index 0000000..1295fa9
--- /dev/null
+++ b/lib/sqfshelper/write_inode.c
@@ -0,0 +1,327 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * write_inode.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>
+
+static size_t hard_link_count(tree_node_t *n)
+{
+ size_t count;
+
+ if (S_ISDIR(n->mode)) {
+ count = 2;
+
+ for (n = n->data.dir->children; n != NULL; n = n->next)
+ ++count;
+
+ return count;
+ }
+
+ return 1;
+}
+
+static int get_type(tree_node_t *node)
+{
+ switch (node->mode & S_IFMT) {
+ case S_IFSOCK:
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_SOCKET;
+ return SQFS_INODE_SOCKET;
+ case S_IFIFO:
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_FIFO;
+ return SQFS_INODE_FIFO;
+ case S_IFLNK:
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_SLINK;
+ return SQFS_INODE_SLINK;
+ case S_IFBLK:
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_BDEV;
+ return SQFS_INODE_BDEV;
+ case S_IFCHR:
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_CDEV;
+ return SQFS_INODE_CDEV;
+ case S_IFREG: {
+ file_info_t *fi = node->data.file;
+
+ if (node->xattr != NULL || fi->sparse > 0)
+ return SQFS_INODE_EXT_FILE;
+
+ if (fi->startblock > 0xFFFFFFFFUL || fi->size > 0xFFFFFFFFUL)
+ return SQFS_INODE_EXT_FILE;
+
+ if (hard_link_count(node) > 1)
+ return SQFS_INODE_EXT_FILE;
+
+ return SQFS_INODE_FILE;
+ }
+ case S_IFDIR: {
+ dir_info_t *di = node->data.dir;
+
+ if (node->xattr != NULL)
+ return SQFS_INODE_EXT_DIR;
+
+ if (di->start_block > 0xFFFFFFFFUL || di->size > 0xFFFF)
+ return SQFS_INODE_EXT_DIR;
+
+ return SQFS_INODE_DIR;
+ }
+ }
+ assert(0);
+}
+
+static int write_file_blocks(fstree_t *fs, file_info_t *fi, meta_writer_t *im)
+{
+ uint64_t i, count = fi->size / fs->block_size;
+ uint32_t bs;
+
+ if ((fi->size % fs->block_size) != 0 &&
+ !(fi->flags & FILE_FLAG_HAS_FRAGMENT)) {
+ ++count;
+ }
+
+ for (i = 0; i < count; ++i) {
+ bs = htole32(fi->blocks[i].size);
+
+ if (meta_writer_append(im, &bs, sizeof(bs)))
+ return -1;
+ }
+ return 0;
+}
+
+static int write_dir_index(dir_index_t *diridx, meta_writer_t *im)
+{
+ sqfs_dir_index_t idx;
+ size_t i;
+
+ for (i = 0; i < diridx->num_nodes; ++i) {
+ idx.start_block = htole32(diridx->idx_nodes[i].block);
+ idx.index = htole32(diridx->idx_nodes[i].index);
+ idx.size = strlen(diridx->idx_nodes[i].node->name) - 1;
+ idx.size = htole32(idx.size);
+
+ if (meta_writer_append(im, &idx, sizeof(idx)))
+ return -1;
+
+ if (meta_writer_append(im, diridx->idx_nodes[i].node->name,
+ le32toh(idx.size) + 1)) {
+ return -1;
+ }
+ }
+ return 0;
+}
+
+int meta_writer_write_inode(fstree_t *fs, id_table_t *idtbl, meta_writer_t *im,
+ meta_writer_t *dm, tree_node_t *node)
+{
+ dir_index_t *diridx = NULL;
+ uint16_t uid_idx, gid_idx;
+ sqfs_inode_t base;
+ uint32_t offset;
+ uint64_t block;
+
+ if (id_table_id_to_index(idtbl, node->uid, &uid_idx))
+ return -1;
+
+ if (id_table_id_to_index(idtbl, node->gid, &gid_idx))
+ return -1;
+
+ meta_writer_get_position(im, &block, &offset);
+ node->inode_ref = (block << 16) | offset;
+
+ if (S_ISDIR(node->mode)) {
+ if (meta_writer_write_dir(dm, node->data.dir, &diridx))
+ return -1;
+ }
+
+ base.type = htole16(get_type(node));
+ base.mode = htole16(node->mode);
+ base.uid_idx = htole16(uid_idx);
+ base.gid_idx = htole16(gid_idx);
+ base.mod_time = htole32(node->mod_time);
+ base.inode_number = htole32(node->inode_num);
+
+ if (meta_writer_append(im, &base, sizeof(base))) {
+ free(diridx);
+ return -1;
+ }
+
+ switch (le16toh(base.type)) {
+ case SQFS_INODE_FIFO:
+ case SQFS_INODE_SOCKET: {
+ sqfs_inode_ipc_t ipc = {
+ .nlink = htole32(hard_link_count(node)),
+ };
+
+ return meta_writer_append(im, &ipc, sizeof(ipc));
+ }
+ case SQFS_INODE_EXT_FIFO:
+ case SQFS_INODE_EXT_SOCKET: {
+ sqfs_inode_ipc_ext_t ipc = {
+ .nlink = htole32(hard_link_count(node)),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ if (node->xattr != NULL)
+ ipc.xattr_idx = htole32(node->xattr->index);
+
+ return meta_writer_append(im, &ipc, sizeof(ipc));
+ }
+ case SQFS_INODE_SLINK: {
+ sqfs_inode_slink_t slink = {
+ .nlink = htole32(hard_link_count(node)),
+ .target_size = htole32(strlen(node->data.slink_target)),
+ };
+
+ if (meta_writer_append(im, &slink, sizeof(slink)))
+ return -1;
+ if (meta_writer_append(im, node->data.slink_target,
+ le32toh(slink.target_size))) {
+ return -1;
+ }
+ break;
+ }
+ case SQFS_INODE_EXT_SLINK: {
+ sqfs_inode_slink_t slink = {
+ .nlink = htole32(hard_link_count(node)),
+ .target_size = htole32(strlen(node->data.slink_target)),
+ };
+ uint32_t xattr = htole32(0xFFFFFFFF);
+
+ if (node->xattr != NULL)
+ xattr = htole32(node->xattr->index);
+
+ if (meta_writer_append(im, &slink, sizeof(slink)))
+ return -1;
+ if (meta_writer_append(im, node->data.slink_target,
+ le32toh(slink.target_size))) {
+ return -1;
+ }
+ if (meta_writer_append(im, &xattr, sizeof(xattr)))
+ return -1;
+ break;
+ }
+ case SQFS_INODE_BDEV:
+ case SQFS_INODE_CDEV: {
+ sqfs_inode_dev_t dev = {
+ .nlink = htole32(hard_link_count(node)),
+ .devno = htole32(node->data.devno),
+ };
+
+ return meta_writer_append(im, &dev, sizeof(dev));
+ }
+ case SQFS_INODE_EXT_BDEV:
+ case SQFS_INODE_EXT_CDEV: {
+ sqfs_inode_dev_ext_t dev = {
+ .nlink = htole32(hard_link_count(node)),
+ .devno = htole32(node->data.devno),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ if (node->xattr != NULL)
+ dev.xattr_idx = htole32(node->xattr->index);
+
+ return meta_writer_append(im, &dev, sizeof(dev));
+ }
+ case SQFS_INODE_EXT_FILE: {
+ file_info_t *fi = node->data.file;
+ sqfs_inode_file_ext_t ext = {
+ .blocks_start = htole64(fi->startblock),
+ .file_size = htole64(fi->size),
+ .sparse = htole64(fi->sparse),
+ .nlink = htole32(hard_link_count(node)),
+ .fragment_idx = htole32(0xFFFFFFFF),
+ .fragment_offset = htole32(0xFFFFFFFF),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ if ((fi->size % fs->block_size) != 0) {
+ ext.fragment_idx = htole32(fi->fragment);
+ ext.fragment_offset = htole32(fi->fragment_offset);
+ }
+
+ if (node->xattr != NULL)
+ ext.xattr_idx = htole32(node->xattr->index);
+
+ if (meta_writer_append(im, &ext, sizeof(ext)))
+ return -1;
+ return write_file_blocks(fs, fi, im);
+ }
+ case SQFS_INODE_FILE: {
+ file_info_t *fi = node->data.file;
+ sqfs_inode_file_t reg = {
+ .blocks_start = htole32(fi->startblock),
+ .fragment_index = htole32(0xFFFFFFFF),
+ .fragment_offset = htole32(0xFFFFFFFF),
+ .file_size = htole32(fi->size),
+ };
+
+ if ((fi->size % fs->block_size) != 0) {
+ reg.fragment_index = htole32(fi->fragment);
+ reg.fragment_offset = htole32(fi->fragment_offset);
+ }
+
+ if (meta_writer_append(im, &reg, sizeof(reg)))
+ return -1;
+ return write_file_blocks(fs, fi, im);
+ }
+ case SQFS_INODE_DIR: {
+ sqfs_inode_dir_t dir = {
+ .start_block = htole32(node->data.dir->start_block),
+ .nlink = htole32(hard_link_count(node)),
+ .size = htole16(node->data.dir->size),
+ .offset = htole16(node->data.dir->block_offset),
+ .parent_inode = node->parent ?
+ htole32(node->parent->inode_num) : htole32(1),
+ };
+
+ return meta_writer_append(im, &dir, sizeof(dir));
+ }
+ case SQFS_INODE_EXT_DIR: {
+ sqfs_inode_dir_ext_t ext = {
+ .nlink = htole32(hard_link_count(node)),
+ .size = htole32(node->data.dir->size),
+ .start_block = htole32(node->data.dir->start_block),
+ .parent_inode = node->parent ?
+ htole32(node->parent->inode_num) : htole32(1),
+ .inodex_count = htole32(0),
+ .offset = htole16(node->data.dir->block_offset),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ if (node->xattr != NULL)
+ ext.xattr_idx = htole32(node->xattr->index);
+
+ if (diridx != NULL)
+ ext.inodex_count = htole32(diridx->num_nodes - 1);
+
+ if (meta_writer_append(im, &ext, sizeof(ext))) {
+ free(diridx);
+ return -1;
+ }
+
+ if (diridx != NULL && write_dir_index(diridx, im) != 0) {
+ free(diridx);
+ return -1;
+ }
+
+ free(diridx);
+ break;
+ }
+ default:
+ assert(0);
+ }
+ return 0;
+}
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