Add block processor data structure

The interface is designed for parallel, asynchronuous processing of data
blocks with an I/O callback that handles the serialized result.

The underlying implementation is currently still synchronuous.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 72 insertions, 0 deletions

diff --git a/lib/comp/block_processor.c b/lib/comp/block_processor.c
new file mode 100644
index 0000000..5938b3a
--- /dev/null
+++ b/lib/comp/block_processor.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * block_processor.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "config.h"
+
+#include "block_processor.h"
+#include "util.h"
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+struct block_processor_t {
+	size_t max_block_size;
+	compressor_t *cmp;
+	block_cb cb;
+	void *user;
+	int status;
+
+	uint8_t scratch[];
+};
+
+block_processor_t *block_processor_create(size_t max_block_size,
+					  compressor_t *cmp,
+					  unsigned int num_workers,
+					  void *user,
+					  block_cb callback)
+{
+	block_processor_t *proc = calloc(1, sizeof(*proc) + max_block_size);
+	(void)num_workers;
+
+	if (proc == NULL) {
+		perror("Creating block processor");
+		return NULL;
+	}
+
+	proc->max_block_size = max_block_size;
+	proc->cmp = cmp;
+	proc->cb = callback;
+	proc->user = user;
+	return proc;
+}
+
+void block_processor_destroy(block_processor_t *proc)
+{
+	free(proc);
+}
+
+int block_processor_enqueue(block_processor_t *proc, block_t *block)
+{
+	if (process_block(block, proc->cmp,
+			  proc->scratch, proc->max_block_size))
+		goto fail;
+
+	if (proc->cb(proc->user, block))
+		goto fail;
+
+	free(block);
+	return 0;
+fail:
+	free(block);
+	proc->status = -1;
+	return -1;
+}
+
+int block_processor_finish(block_processor_t *proc)
+{
+	return proc->status;
+}