1 files changed, 131 insertions, 0 deletions
diff --git a/lib/sqfs/data_writer/block.c b/lib/sqfs/data_writer/block.c
new file mode 100644
index 0000000..9461737
--- /dev/null
+++ b/lib/sqfs/data_writer/block.c
@@ -0,0 +1,131 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * process_block.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+#include <string.h>
+
+static int store_block_location(sqfs_data_writer_t *proc, uint64_t offset,
+				uint32_t size, uint32_t chksum)
+{
+	size_t new_sz;
+	void *new;
+
+	if (proc->num_blocks == proc->max_blocks) {
+		new_sz = proc->max_blocks * 2;
+		new = realloc(proc->blocks, sizeof(proc->blocks[0]) * new_sz);
+
+		if (new == NULL)
+			return SQFS_ERROR_ALLOC;
+
+		proc->blocks = new;
+		proc->max_blocks = new_sz;
+	}
+
+	proc->blocks[proc->num_blocks].offset = offset;
+	proc->blocks[proc->num_blocks].hash = MK_BLK_HASH(chksum, size);
+	proc->num_blocks += 1;
+	return 0;
+}
+
+static size_t deduplicate_blocks(sqfs_data_writer_t *proc, size_t count)
+{
+	size_t i, j;
+
+	for (i = 0; i < proc->file_start; ++i) {
+		for (j = 0; j < count; ++j) {
+			if (proc->blocks[i + j].hash !=
+			    proc->blocks[proc->file_start + j].hash)
+				break;
+		}
+
+		if (j == count)
+			break;
+	}
+
+	return i;
+}
+
+static int allign_file(sqfs_data_writer_t *proc, sqfs_block_t *blk)
+{
+	if (!(blk->flags & SQFS_BLK_ALLIGN))
+		return 0;
+
+	return padd_sqfs(proc->file, proc->file->get_size(proc->file),
+			 proc->devblksz);
+}
+
+int process_completed_block(sqfs_data_writer_t *proc, sqfs_block_t *blk)
+{
+	size_t start, count;
+	uint64_t offset;
+	uint32_t out;
+	int err;
+
+	if (blk->flags & SQFS_BLK_FIRST_BLOCK) {
+		proc->start = proc->file->get_size(proc->file);
+		proc->file_start = proc->num_blocks;
+
+		err = allign_file(proc, blk);
+		if (err)
+			return err;
+	}
+
+	if (blk->size != 0) {
+		out = blk->size;
+		if (!(blk->flags & SQFS_BLK_IS_COMPRESSED))
+			out |= 1 << 24;
+
+		offset = proc->file->get_size(proc->file);
+
+		if (blk->flags & SQFS_BLK_FRAGMENT_BLOCK) {
+			offset = htole64(offset);
+			proc->fragments[blk->index].start_offset = offset;
+			proc->fragments[blk->index].pad0 = 0;
+			proc->fragments[blk->index].size = htole32(out);
+		} else {
+			blk->inode->block_sizes[blk->index] = out;
+		}
+
+		err = store_block_location(proc, offset, out, blk->checksum);
+		if (err)
+			return err;
+
+		err = proc->file->write_at(proc->file, offset,
+					   blk->data, blk->size);
+		if (err)
+			return err;
+	}
+
+	if (blk->flags & SQFS_BLK_LAST_BLOCK) {
+		err = allign_file(proc, blk);
+		if (err)
+			return err;
+
+		count = proc->num_blocks - proc->file_start;
+		start = deduplicate_blocks(proc, count);
+		offset = proc->blocks[start].offset;
+
+		sqfs_inode_set_file_block_start(blk->inode, offset);
+
+		if (start < proc->file_start) {
+			offset = start + count;
+
+			if (offset >= proc->file_start) {
+				proc->num_blocks = offset;
+			} else {
+				proc->num_blocks = proc->file_start;
+			}
+
+			err = proc->file->truncate(proc->file, proc->start);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}