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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-01-28 21:23:21 +0100
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2020-01-29 17:22:50 +0100
commit9d5b0c381a7961a14d2a94a6b31a4e25a2543eae (patch)
tree089a3cc96f54cd7b09762840d03e4dc2420c5ea9 /lib/sqfs/block_processor/fileapi.c
parent60ff56b68ea0593782d7a2ef0ac4e667437418d2 (diff)
Rename sqfs_data_writer_t back to sqfs_block_processor_t
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/sqfs/block_processor/fileapi.c')
-rw-r--r--lib/sqfs/block_processor/fileapi.c188
1 files changed, 188 insertions, 0 deletions
diff --git a/lib/sqfs/block_processor/fileapi.c b/lib/sqfs/block_processor/fileapi.c
new file mode 100644
index 0000000..9e59c1d
--- /dev/null
+++ b/lib/sqfs/block_processor/fileapi.c
@@ -0,0 +1,188 @@
+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * fileapi.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#define SQFS_BUILDING_DLL
+#include "internal.h"
+
+static bool is_zero_block(unsigned char *ptr, size_t size)
+{
+ return ptr[0] == 0 && memcmp(ptr, ptr + 1, size - 1) == 0;
+}
+
+static int enqueue_block(sqfs_block_processor_t *proc, sqfs_block_t *block)
+{
+ int status;
+
+ while (proc->backlog > proc->max_backlog) {
+ status = wait_completed(proc);
+ if (status)
+ return status;
+ }
+
+ if (proc->backlog == proc->max_backlog)
+ proc->notify_threads = true;
+
+ return append_to_work_queue(proc, block, proc->notify_threads);
+}
+
+static int add_sentinel_block(sqfs_block_processor_t *proc)
+{
+ sqfs_block_t *blk = calloc(1, sizeof(*blk));
+
+ if (blk == NULL)
+ return test_and_set_status(proc, SQFS_ERROR_ALLOC);
+
+ blk->inode = proc->inode;
+ blk->flags = proc->blk_flags | SQFS_BLK_LAST_BLOCK;
+
+ return enqueue_block(proc, blk);
+}
+
+int sqfs_block_processor_begin_file(sqfs_block_processor_t *proc,
+ sqfs_inode_generic_t *inode, sqfs_u32 flags)
+{
+ if (proc->inode != NULL)
+ return test_and_set_status(proc, SQFS_ERROR_INTERNAL);
+
+ if (flags & ~SQFS_BLK_USER_SETTABLE_FLAGS)
+ return test_and_set_status(proc, SQFS_ERROR_UNSUPPORTED);
+
+ proc->inode = inode;
+ proc->blk_flags = flags | SQFS_BLK_FIRST_BLOCK;
+ proc->blk_index = 0;
+ proc->blk_current = NULL;
+ return 0;
+}
+
+static int flush_block(sqfs_block_processor_t *proc, sqfs_block_t *block)
+{
+ block->index = proc->blk_index++;
+ block->flags = proc->blk_flags;
+ block->inode = proc->inode;
+
+ if (is_zero_block(block->data, block->size)) {
+ sqfs_inode_make_extended(proc->inode);
+ proc->inode->data.file_ext.sparse += block->size;
+ proc->inode->num_file_blocks += 1;
+ proc->inode->extra[block->index] = 0;
+ free(block);
+ return 0;
+ }
+
+ if (block->size < proc->max_block_size &&
+ !(block->flags & SQFS_BLK_DONT_FRAGMENT)) {
+ block->flags |= SQFS_BLK_IS_FRAGMENT;
+ } else {
+ proc->inode->num_file_blocks += 1;
+ proc->blk_flags &= ~SQFS_BLK_FIRST_BLOCK;
+ }
+
+ return enqueue_block(proc, block);
+}
+
+int sqfs_block_processor_append(sqfs_block_processor_t *proc, const void *data,
+ size_t size)
+{
+ size_t diff;
+ void *new;
+ int err;
+
+ while (size > 0) {
+ if (proc->blk_current == NULL) {
+ new = alloc_flex(sizeof(*proc->blk_current), 1,
+ proc->max_block_size);
+
+ if (new == NULL)
+ return test_and_set_status(proc,
+ SQFS_ERROR_ALLOC);
+
+ proc->blk_current = new;
+ }
+
+ diff = proc->max_block_size - proc->blk_current->size;
+
+ if (diff == 0) {
+ err = flush_block(proc, proc->blk_current);
+ proc->blk_current = NULL;
+ if (err)
+ return err;
+ continue;
+ }
+
+ if (diff > size)
+ diff = size;
+
+ memcpy(proc->blk_current->data + proc->blk_current->size,
+ data, diff);
+
+ size -= diff;
+ proc->blk_current->size += diff;
+ data = (const char *)data + diff;
+ }
+
+ if (proc->blk_current != NULL &&
+ proc->blk_current->size == proc->max_block_size) {
+ err = flush_block(proc, proc->blk_current);
+ proc->blk_current = NULL;
+ return err;
+ }
+
+ return 0;
+}
+
+int sqfs_block_processor_end_file(sqfs_block_processor_t *proc)
+{
+ int err;
+
+ if (proc->inode == NULL)
+ return test_and_set_status(proc, SQFS_ERROR_INTERNAL);
+
+ if (!(proc->blk_flags & SQFS_BLK_FIRST_BLOCK)) {
+ if (proc->blk_current != NULL &&
+ (proc->blk_flags & SQFS_BLK_DONT_FRAGMENT)) {
+ proc->blk_flags |= SQFS_BLK_LAST_BLOCK;
+ } else {
+ err = add_sentinel_block(proc);
+ if (err)
+ return err;
+ }
+ }
+
+ if (proc->blk_current != NULL) {
+ err = flush_block(proc, proc->blk_current);
+ proc->blk_current = NULL;
+ }
+
+ proc->inode = NULL;
+ proc->blk_flags = 0;
+ proc->blk_index = 0;
+ return 0;
+}
+
+int sqfs_block_processor_finish(sqfs_block_processor_t *proc)
+{
+ int status = 0;
+
+ append_to_work_queue(proc, NULL, true);
+
+ while (proc->backlog > 0) {
+ status = wait_completed(proc);
+ if (status)
+ return status;
+ }
+
+ if (proc->frag_block != NULL) {
+ status = append_to_work_queue(proc, proc->frag_block, true);
+ proc->frag_block = NULL;
+
+ if (status)
+ return status;
+
+ status = wait_completed(proc);
+ }
+
+ return status;
+}