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-rw-r--r--lib/Makemodule.am2
-rw-r--r--lib/sqfs/serialize_fstree.c100
-rw-r--r--lib/sqfs/write_dir.c127
-rw-r--r--lib/sqfs/write_inode.c292
4 files changed, 521 insertions, 0 deletions
diff --git a/lib/Makemodule.am b/lib/Makemodule.am
index 536cad0..bf4ed61 100644
--- a/lib/Makemodule.am
+++ b/lib/Makemodule.am
@@ -17,6 +17,8 @@ libsquashfs_a_SOURCES += lib/sqfs/read_super.c lib/sqfs/meta_reader.c
libsquashfs_a_SOURCES += include/meta_reader.h lib/sqfs/id_table_write.c
libsquashfs_a_SOURCES += lib/sqfs/id_table_read.c lib/sqfs/read_inode.c
libsquashfs_a_SOURCES += lib/sqfs/readdir.c lib/sqfs/frag_reader.c
+libsquashfs_a_SOURCES += lib/sqfs/write_dir.c lib/sqfs/write_inode.c
+libsquashfs_a_SOURCES += lib/sqfs/serialize_fstree.c
libsquashfs_a_SOURCES += include/frag_reader.h
libutil_a_SOURCES = lib/util/canonicalize_name.c lib/util/write_retry.c
diff --git a/lib/sqfs/serialize_fstree.c b/lib/sqfs/serialize_fstree.c
new file mode 100644
index 0000000..95b9144
--- /dev/null
+++ b/lib/sqfs/serialize_fstree.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "meta_writer.h"
+#include "table.h"
+#include "util.h"
+
+#include <unistd.h>
+#include <stdio.h>
+
+int sqfs_serialize_fstree(int outfd, sqfs_super_t *super, fstree_t *fs,
+ compressor_t *cmp, id_table_t *idtbl)
+{
+ meta_writer_t *im, *dm;
+ uint8_t buffer[1024];
+ uint32_t offset;
+ uint64_t block;
+ size_t i, diff;
+ ssize_t ret;
+ FILE *tmp;
+ int tmpfd;
+
+ tmp = tmpfile();
+ if (tmp == NULL) {
+ perror("tmpfile");
+ return -1;
+ }
+
+ tmpfd = fileno(tmp);
+
+ im = meta_writer_create(outfd, cmp);
+ if (im == NULL)
+ goto fail_tmp;
+
+ dm = meta_writer_create(tmpfd, cmp);
+ if (dm == NULL)
+ goto fail_im;
+
+ for (i = 2; i < fs->inode_tbl_size; ++i) {
+ if (meta_writer_write_inode(fs, idtbl, im, dm,
+ fs->inode_table[i])) {
+ goto fail;
+ }
+ }
+
+ if (meta_writer_flush(im))
+ goto fail;
+
+ if (meta_writer_flush(dm))
+ goto fail;
+
+ super->root_inode_ref = fs->root->inode_ref;
+
+ meta_writer_get_position(im, &block, &offset);
+ super->inode_table_start = super->bytes_used;
+ super->bytes_used += block;
+
+ super->directory_table_start = super->bytes_used;
+ meta_writer_get_position(dm, &block, &offset);
+ super->bytes_used += block;
+
+ if (lseek(tmpfd, 0, SEEK_SET) == (off_t)-1) {
+ perror("rewind on directory temp file");
+ goto fail;
+ }
+
+ for (;;) {
+ ret = read_retry(tmpfd, buffer, sizeof(buffer));
+
+ if (ret < 0) {
+ perror("read from temp file");
+ goto fail;
+ }
+ if (ret == 0)
+ break;
+
+ diff = ret;
+ ret = write_retry(outfd, buffer, diff);
+
+ if (ret < 0) {
+ perror("write to image file");
+ goto fail;
+ }
+ if ((size_t)ret < diff) {
+ fputs("copying meta data to image file: "
+ "truncated write\n", stderr);
+ goto fail;
+ }
+ }
+
+ meta_writer_destroy(dm);
+ meta_writer_destroy(im);
+ fclose(tmp);
+ return 0;
+fail:
+ meta_writer_destroy(dm);
+fail_im:
+ meta_writer_destroy(im);
+fail_tmp:
+ fclose(tmp);
+ return -1;
+}
diff --git a/lib/sqfs/write_dir.c b/lib/sqfs/write_dir.c
new file mode 100644
index 0000000..b334864
--- /dev/null
+++ b/lib/sqfs/write_dir.c
@@ -0,0 +1,127 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#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;
+ uint32_t offset;
+ uint64_t block;
+
+ 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;
+
+ /* XXX: difference is actually signed */
+ if ((d->inode_num - c->inode_num) > 0x7FFF)
+ 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].offset = offset;
+
+ 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.offset = htole16(c->inode_ref & 0x0000FFFF);
+ ent.inode_number = htole16(c->inode_num - d->inode_num);
+ 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;
+}
diff --git a/lib/sqfs/write_inode.c b/lib/sqfs/write_inode.c
new file mode 100644
index 0000000..961013c
--- /dev/null
+++ b/lib/sqfs/write_inode.c
@@ -0,0 +1,292 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "meta_writer.h"
+#include "util.h"
+
+#include <assert.h>
+#include <endian.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int get_type(tree_node_t *node)
+{
+ int type;
+
+ switch (node->mode & S_IFMT) {
+ case S_IFSOCK: type = SQFS_INODE_SOCKET; break;
+ case S_IFIFO: type = SQFS_INODE_FIFO; break;
+ case S_IFLNK: type = SQFS_INODE_SLINK; break;
+ case S_IFBLK: type = SQFS_INODE_BDEV; break;
+ case S_IFCHR: type = SQFS_INODE_CDEV; break;
+ case S_IFDIR: type = SQFS_INODE_DIR; break;
+ case S_IFREG: type = SQFS_INODE_FILE; break;
+ default:
+ assert(0);
+ }
+
+ if (node->xattr != NULL)
+ type = SQFS_INODE_EXT_TYPE(type);
+
+ return type;
+}
+
+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;
+}
+
+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;
+ file_info_t *fi = NULL;
+ dir_info_t *di = NULL;
+ uint32_t bs, offset;
+ sqfs_inode_t base;
+ uint64_t i, block;
+ int type;
+
+ 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;
+
+ type = get_type(node);
+
+ if (S_ISDIR(node->mode)) {
+ di = node->data.dir;
+
+ if (meta_writer_write_dir(dm, di, &diridx))
+ return -1;
+
+ if ((di->start_block) > 0xFFFFFFFFUL || di->size > 0xFFFF ||
+ node->xattr != NULL) {
+ type = SQFS_INODE_EXT_DIR;
+ } else {
+ type = SQFS_INODE_DIR;
+ free(diridx);
+ diridx = NULL;
+ }
+ } else if (S_ISREG(node->mode)) {
+ fi = node->data.file;
+
+ if (fi->startblock > 0xFFFFFFFFUL || fi->size > 0xFFFFFFFFUL ||
+ hard_link_count(node) > 1) {
+ type = SQFS_INODE_EXT_FILE;
+ }
+ }
+
+ base.type = htole16(type);
+ base.mode = htole16(node->mode);
+ base.uid_idx = htole16(uid_idx);
+ base.gid_idx = htole16(gid_idx);
+ base.mod_time = htole32(fs->default_mtime);
+ base.inode_number = htole32(node->inode_num);
+
+ if (meta_writer_append(im, &base, sizeof(base))) {
+ free(diridx);
+ return -1;
+ }
+
+ switch (type) {
+ case SQFS_INODE_FIFO:
+ case SQFS_INODE_SOCKET: {
+ sqfs_inode_ipc_t ipc = {
+ .nlink = 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 = 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: {
+ sqfs_inode_file_ext_t ext = {
+ .blocks_start = htole64(fi->startblock),
+ .file_size = htole64(fi->size),
+ .sparse = htole64(0xFFFFFFFFFFFFFFFFUL),
+ .nlink = htole32(hard_link_count(node)),
+ .fragment_idx = htole32(fi->fragment),
+ .fragment_offset = htole32(fi->fragment_offset),
+ .xattr_idx = htole32(0xFFFFFFFF),
+ };
+
+ if (node->xattr != NULL)
+ ext.xattr_idx = htole32(node->xattr->index);
+
+ if (meta_writer_append(im, &ext, sizeof(ext)))
+ return -1;
+ goto out_file_blocks;
+ }
+ case SQFS_INODE_FILE: {
+ sqfs_inode_file_t reg = {
+ .blocks_start = htole32(fi->startblock),
+ .fragment_index = htole32(fi->fragment),
+ .fragment_offset = htole32(fi->fragment_offset),
+ .file_size = htole32(fi->size),
+ };
+
+ if (meta_writer_append(im, &reg, sizeof(reg)))
+ return -1;
+ goto out_file_blocks;
+ }
+ 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_dir_index_t idx;
+ size_t i;
+ 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 (meta_writer_append(im, &ext, sizeof(ext))) {
+ free(diridx);
+ return -1;
+ }
+
+ /* HACK: truncated index for empty directories */
+ if (node->data.dir->size == 0)
+ break;
+
+ ext.inodex_count = htole32(diridx->num_nodes - 1);
+
+ for (i = 0; i < diridx->num_nodes; ++i) {
+ idx.start_block = htole32(diridx->idx_nodes[i].block);
+
+ idx.index = diridx->idx_nodes[i].offset;
+ idx.index -= node->data.dir->block_offset;
+ idx.index = htole32(idx.index);
+
+ idx.size = strlen(diridx->idx_nodes[i].node->name) - 1;
+ idx.size = htole32(idx.size);
+
+ if (meta_writer_append(im, &idx, sizeof(idx))) {
+ free(diridx);
+ return -1;
+ }
+
+ if (meta_writer_append(im,
+ diridx->idx_nodes[i].node->name,
+ le32toh(idx.size) + 1)) {
+ free(diridx);
+ return -1;
+ }
+ }
+
+ free(diridx);
+ break;
+ }
+ default:
+ assert(0);
+ }
+ return 0;
+out_file_blocks:
+ for (i = 0; i < fi->size / fs->block_size; ++i) {
+ bs = htole32(fi->blocksizes[i]);
+
+ if (meta_writer_append(im, &bs, sizeof(bs)))
+ return -1;
+ }
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 16:20:19 +0000