summaryrefslogtreecommitdiff
path: root/lib/sqfs/data_writer/block.c
diff options
context:
space:
mode:
authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-25 07:28:04 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-25 07:29:11 +0200
commitedac31f28863ae9f1b310d971fb194959c42c916 (patch)
treed9d81491e442123d776c6265795db47247ee6346 /lib/sqfs/data_writer/block.c
parent9434bdfaedb733e1441d87fedde8056efeda7145 (diff)
Rename block processor to sqfs_data_writer_t
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/data_writer/block.c')
-rw-r--r--lib/sqfs/data_writer/block.c131
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;
+}