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-rw-r--r--lib/sqfs/table.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/lib/sqfs/table.c b/lib/sqfs/table.c
new file mode 100644
index 0000000..2fab3cc
--- /dev/null
+++ b/lib/sqfs/table.c
@@ -0,0 +1,94 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+#include "meta_writer.h"
+#include "table.h"
+#include "util.h"
+
+#include <endian.h>
+#include <stdio.h>
+
+static int sqfs_write_table(int outfd, sqfs_super_t *super, const void *data,
+ size_t entsize, size_t count, uint64_t *startblock,
+ compressor_t *cmp)
+{
+ size_t ent_per_blocks = SQFS_META_BLOCK_SIZE / entsize;
+ uint64_t blocks[count / ent_per_blocks + 1];
+ size_t i, blkidx = 0, tblsize;
+ meta_writer_t *m;
+ ssize_t ret;
+
+ /* Write actual data. Whenever we cross a block boundary, remember
+ the block start offset */
+ m = meta_writer_create(outfd, cmp);
+ if (m == NULL)
+ return -1;
+
+ for (i = 0; i < count; ++i) {
+ if (blkidx == 0 || m->block_offset > blocks[blkidx - 1])
+ blocks[blkidx++] = m->block_offset;
+
+ if (meta_writer_append(m, data, entsize))
+ goto fail;
+
+ data = (const char *)data + entsize;
+ }
+
+ if (meta_writer_flush(m))
+ goto fail;
+
+ for (i = 0; i < blkidx; ++i)
+ blocks[i] = htole64(blocks[i] + super->bytes_used);
+
+ super->bytes_used += m->block_offset;
+ meta_writer_destroy(m);
+
+ /* write new index table */
+ *startblock = super->bytes_used;
+ tblsize = sizeof(blocks[0]) * blkidx;
+
+ ret = write_retry(outfd, blocks, tblsize);
+ if (ret < 0) {
+ perror("writing index table");
+ return -1;
+ }
+
+ if ((size_t)ret < tblsize) {
+ fputs("index table truncated\n", stderr);
+ return -1;
+ }
+
+ super->bytes_used += tblsize;
+ return 0;
+fail:
+ meta_writer_destroy(m);
+ return -1;
+}
+
+int sqfs_write_fragment_table(int outfd, sqfs_super_t *super,
+ sqfs_fragment_t *fragments, size_t count,
+ compressor_t *cmp)
+{
+ super->fragment_entry_count = count;
+
+ return sqfs_write_table(outfd, super, fragments, sizeof(fragments[0]),
+ count, &super->fragment_table_start, cmp);
+}
+
+int sqfs_write_ids(int outfd, sqfs_super_t *super, uint32_t *id_tbl,
+ size_t count, compressor_t *cmp)
+{
+ size_t i;
+ int ret;
+
+ for (i = 0; i < count; ++i)
+ id_tbl[i] = htole32(id_tbl[i]);
+
+ super->id_count = count;
+
+ ret = sqfs_write_table(outfd, super, id_tbl, sizeof(id_tbl[0]),
+ count, &super->id_table_start, cmp);
+
+ for (i = 0; i < count; ++i)
+ id_tbl[i] = htole32(id_tbl[i]);
+
+ return ret;
+}