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-rw-r--r--lib/sqfs/data_writer/fragment.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/lib/sqfs/data_writer/fragment.c b/lib/sqfs/data_writer/fragment.c
new file mode 100644
index 0000000..e4fe9b4
--- /dev/null
+++ b/lib/sqfs/data_writer/fragment.c
@@ -0,0 +1,128 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * fragtbl.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+static int grow_fragment_table(sqfs_data_writer_t *proc)
+{
+ size_t newsz;
+ void *new;
+
+ if (proc->num_fragments >= proc->max_fragments) {
+ newsz = proc->max_fragments ? proc->max_fragments * 2 : 16;
+
+ new = realloc(proc->fragments,
+ sizeof(proc->fragments[0]) * newsz);
+
+ if (new == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ proc->max_fragments = newsz;
+ proc->fragments = new;
+ }
+
+ return 0;
+}
+
+static int grow_deduplication_list(sqfs_data_writer_t *proc)
+{
+ size_t new_sz;
+ void *new;
+
+ if (proc->frag_list_num == proc->frag_list_max) {
+ new_sz = proc->frag_list_max * 2;
+ new = realloc(proc->frag_list,
+ sizeof(proc->frag_list[0]) * new_sz);
+
+ if (new == NULL)
+ return SQFS_ERROR_ALLOC;
+
+ proc->frag_list = new;
+ proc->frag_list_max = new_sz;
+ }
+
+ return 0;
+}
+
+static int store_fragment(sqfs_data_writer_t *proc, sqfs_block_t *frag,
+ uint64_t hash)
+{
+ int err = grow_deduplication_list(proc);
+
+ if (err)
+ return err;
+
+ proc->frag_list[proc->frag_list_num].index = proc->frag_block->index;
+ proc->frag_list[proc->frag_list_num].offset = proc->frag_block->size;
+ proc->frag_list[proc->frag_list_num].hash = hash;
+ proc->frag_list_num += 1;
+
+ sqfs_inode_set_frag_location(frag->inode, proc->frag_block->index,
+ proc->frag_block->size);
+
+ memcpy(proc->frag_block->data + proc->frag_block->size,
+ frag->data, frag->size);
+
+ proc->frag_block->flags |= (frag->flags & SQFS_BLK_DONT_COMPRESS);
+ proc->frag_block->size += frag->size;
+ return 0;
+}
+
+int process_completed_fragment(sqfs_data_writer_t *proc, sqfs_block_t *frag,
+ sqfs_block_t **blk_out)
+{
+ uint64_t hash;
+ size_t i, size;
+ int err;
+
+ hash = MK_BLK_HASH(frag->checksum, frag->size);
+
+ for (i = 0; i < proc->frag_list_num; ++i) {
+ if (proc->frag_list[i].hash == hash) {
+ sqfs_inode_set_frag_location(frag->inode,
+ proc->frag_list[i].index,
+ proc->frag_list[i].offset);
+ return 0;
+ }
+ }
+
+ if (proc->frag_block != NULL) {
+ size = proc->frag_block->size + frag->size;
+
+ if (size > proc->max_block_size) {
+ *blk_out = proc->frag_block;
+ proc->frag_block = NULL;
+ }
+ }
+
+ if (proc->frag_block == NULL) {
+ size = sizeof(sqfs_block_t) + proc->max_block_size;
+
+ err = grow_fragment_table(proc);
+ if (err)
+ goto fail;
+
+ proc->frag_block = calloc(1, size);
+ if (proc->frag_block == NULL) {
+ err = SQFS_ERROR_ALLOC;
+ goto fail;
+ }
+
+ proc->frag_block->index = proc->num_fragments++;
+ proc->frag_block->flags = SQFS_BLK_FRAGMENT_BLOCK;
+ }
+
+ err = store_fragment(proc, frag, hash);
+ if (err)
+ goto fail;
+
+ return 0;
+fail:
+ free(*blk_out);
+ *blk_out = NULL;
+ return err;
+}