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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/*
* block_processor.h - This file is part of libsquashfs
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef SFQS_BLOCK_PROCESSOR_H
#define SFQS_BLOCK_PROCESSOR_H
#include "sqfs/predef.h"
enum {
/* only calculate checksum, do NOT compress the data */
SQFS_BLK_DONT_COMPRESS = 0x0001,
/* set by compressor worker if the block was actually compressed */
SQFS_BLK_IS_COMPRESSED = 0x0002,
/* do not calculate block checksum */
SQFS_BLK_DONT_CHECKSUM = 0x0004,
/* set by compressor worker if compression failed */
SQFS_BLK_COMPRESS_ERROR = 0x0008,
/* first user setable block flag */
SQFS_BLK_USER = 0x0080
};
struct sqfs_block_t {
/* used internally, ignored and overwritten when enqueueing blocks */
sqfs_block_t *next;
uint32_t sequence_number;
/* Size of the data area */
uint32_t size;
/* checksum of the input data */
uint32_t checksum;
/* user settable file block index */
uint32_t index;
/* user pointer associated with the block */
void *user;
/* user settable flag field */
uint32_t flags;
/* raw data to be processed */
uint8_t data[];
};
/*
Gets called for each processed block. May be called from a different thread
than the one that calls enqueue, but only from one thread at a time.
Guaranteed to be called on blocks in the order that they are submitted
to enqueue.
A non-zero return value is interpreted as fatal error.
*/
typedef int (*sqfs_block_cb)(void *user, sqfs_block_t *blk);
#ifdef __cplusplus
extern "C" {
#endif
SQFS_API
sqfs_block_processor_t *sqfs_block_processor_create(size_t max_block_size,
sqfs_compressor_t *cmp,
unsigned int num_workers,
void *user,
sqfs_block_cb callback);
SQFS_API void sqfs_block_processor_destroy(sqfs_block_processor_t *proc);
/*
Add a block to be processed. Returns non-zero on error and prints a message
to stderr.
The function takes over ownership of the submitted block. It is freed with
a after processing and calling the block callback.
Even on failure, the workers may still be running and
sqfs_block_processor_finish must be called before cleaning up.
*/
SQFS_API int sqfs_block_processor_enqueue(sqfs_block_processor_t *proc,
sqfs_block_t *block);
/*
Wait for the compressor workers to finish. Returns zero on success, non-zero
if an internal error occoured or one of the block callbacks returned a
non-zero value.
*/
SQFS_API int sqfs_block_processor_finish(sqfs_block_processor_t *proc);
/*
Convenience function to process a data block. Returns 0 on success,
prints to stderr on failure.
*/
SQFS_API int sqfs_block_process(sqfs_block_t *block, sqfs_compressor_t *cmp,
uint8_t *scratch, size_t scratch_size);
#ifdef __cplusplus
}
#endif
#endif /* SFQS_BLOCK_PROCESSOR_H */
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