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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-02 00:37:50 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-05-03 21:45:46 +0200
commit1796ff184ba862508fc578c985dd9ebcc15a048d (patch)
treec73bf7226963e17ad45ed31d739ca5f5ebf7f1f3 /unpack/tree_node_from_inode.c
parentaffbcaf1deab75cf83e95512ff539d73474909e2 (diff)
unsquashfs: add function to turn inode into fs tree node
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'unpack/tree_node_from_inode.c')
-rw-r--r--unpack/tree_node_from_inode.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/unpack/tree_node_from_inode.c b/unpack/tree_node_from_inode.c
new file mode 100644
index 0000000..95056a7
--- /dev/null
+++ b/unpack/tree_node_from_inode.c
@@ -0,0 +1,144 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "unsquashfs.h"
+
+static size_t compute_size(sqfs_inode_generic_t *inode, const char *name,
+ size_t block_size)
+{
+ size_t size = sizeof(tree_node_t) + strlen(name) + 1;
+ size_t block_count = 0;
+
+ switch (inode->base.type) {
+ case SQFS_INODE_DIR:
+ case SQFS_INODE_EXT_DIR:
+ size += sizeof(dir_info_t);
+ break;
+ case SQFS_INODE_FILE:
+ size += sizeof(file_info_t);
+ block_count = inode->data.file.file_size / block_size;
+ break;
+ case SQFS_INODE_EXT_FILE:
+ size += sizeof(file_info_t);
+ block_count = inode->data.file_ext.file_size / block_size;
+ break;
+ case SQFS_INODE_SLINK:
+ case SQFS_INODE_EXT_SLINK:
+ size += strlen(inode->slink_target) + 1;
+ break;
+ default:
+ break;
+ }
+
+ return size + block_count * sizeof(uint32_t);
+}
+
+static void copy_block_sizes(sqfs_inode_generic_t *inode, tree_node_t *out,
+ size_t block_size)
+{
+ size_t block_count = out->data.file->size / block_size;
+
+ out->name += block_count * sizeof(uint32_t);
+
+ if (block_count) {
+ memcpy(out->data.file->blocksizes, inode->block_sizes,
+ block_count * sizeof(uint32_t));
+ }
+}
+
+tree_node_t *tree_node_from_inode(sqfs_inode_generic_t *inode,
+ const id_table_t *idtbl,
+ const char *name,
+ size_t block_size)
+{
+ tree_node_t *out;
+
+ if (inode->base.uid_idx >= idtbl->num_ids) {
+ fputs("converting inode to fs tree node: UID out of range\n",
+ stderr);
+ return NULL;
+ }
+
+ if (inode->base.gid_idx >= idtbl->num_ids) {
+ fputs("converting inode to fs tree node: GID out of range\n",
+ stderr);
+ return NULL;
+ }
+
+ out = calloc(1, compute_size(inode, name, block_size));
+ if (out == NULL) {
+ perror("converting inode to fs tree node");
+ return NULL;
+ }
+
+ out->uid = idtbl->ids[inode->base.uid_idx];
+ out->gid = idtbl->ids[inode->base.gid_idx];
+ out->mode = inode->base.mode;
+ out->type = inode->base.type;
+ out->inode_num = inode->base.inode_number;
+ out->name = (char *)out->payload;
+
+ switch (inode->base.type) {
+ case SQFS_INODE_DIR:
+ out->data.dir = (dir_info_t *)out->payload;
+ out->name += sizeof(dir_info_t);
+
+ out->data.dir->size = inode->data.dir.size;
+ out->data.dir->start_block = inode->data.dir.start_block;
+ out->data.dir->block_offset = inode->data.dir.offset;
+ break;
+ case SQFS_INODE_EXT_DIR:
+ out->data.dir = (dir_info_t *)out->payload;
+ out->name += sizeof(dir_info_t);
+
+ out->data.dir->size = inode->data.dir_ext.size;
+ out->data.dir->start_block = inode->data.dir_ext.start_block;
+ out->data.dir->block_offset = inode->data.dir_ext.offset;
+ break;
+ case SQFS_INODE_FILE:
+ out->data.file = (file_info_t *)out->payload;
+ out->name += sizeof(file_info_t);
+
+ out->data.file->size = inode->data.file.file_size;
+ out->data.file->startblock = inode->data.file.blocks_start;
+ out->data.file->fragment = inode->data.file.fragment_index;
+ out->data.file->fragment_offset =
+ inode->data.file.fragment_offset;
+
+ copy_block_sizes(inode, out, block_size);
+ break;
+ case SQFS_INODE_EXT_FILE:
+ out->data.file = (file_info_t *)out->payload;
+ out->name += sizeof(file_info_t);
+
+ out->data.file->size = inode->data.file_ext.file_size;
+ out->data.file->startblock = inode->data.file_ext.blocks_start;
+ out->data.file->fragment = inode->data.file_ext.fragment_idx;
+ out->data.file->fragment_offset =
+ inode->data.file_ext.fragment_offset;
+
+ copy_block_sizes(inode, out, block_size);
+ break;
+ case SQFS_INODE_SLINK:
+ case SQFS_INODE_EXT_SLINK:
+ out->data.slink_target = (char *)out->payload;
+ strcpy(out->data.slink_target, inode->slink_target);
+
+ out->name = (char *)out->payload +
+ strlen(inode->slink_target) + 1;
+ break;
+ case SQFS_INODE_BDEV:
+ case SQFS_INODE_CDEV:
+ out->name = (char *)out->payload;
+ out->data.devno = inode->data.dev.devno;
+ break;
+ case SQFS_INODE_EXT_BDEV:
+ case SQFS_INODE_EXT_CDEV:
+ out->name = (char *)out->payload;
+ out->data.devno = inode->data.dev_ext.devno;
+ break;
+ default:
+ break;
+ }
+
+ strcpy(out->name, name);
+ return out;
+}