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-rw-r--r--include/compress.h71
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-/* SPDX-License-Identifier: GPL-3.0-or-later */
-/*
- * compress.h
- *
- * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
- */
-#ifndef COMPRESS_H
-#define COMPRESS_H
-
-#include "config.h"
-
-#include <sys/types.h>
-#include <stdbool.h>
-#include <stddef.h>
-#include <stdint.h>
-
-#include "squashfs.h"
-
-typedef struct compressor_t compressor_t;
-
-/* Encapsultes a compressor with a simple interface to compress or
- uncompress/extract blocks of data. */
-struct compressor_t {
- /* Write compressor options to the output file if necessary.
- Returns the number of bytes written or -1 on failure.
- Internally prints error messages to stderr. */
- int (*write_options)(compressor_t *cmp, int fd);
-
- /* Read compressor options to the input file.
- Returns zero on success, -1 on failure.
- Internally prints error messages to stderr. */
- int (*read_options)(compressor_t *cmp, int fd);
-
- /*
- Compress or uncompress a chunk of data.
-
- Returns the number of bytes written to the output buffer, -1 on
- failure or 0 if the output buffer was too small.
- The compressor also returns 0 if the compressed result ends
- up larger than the original input.
-
- Internally prints compressor specific error messages to stderr.
- */
- ssize_t (*do_block)(compressor_t *cmp, const uint8_t *in, size_t size,
- uint8_t *out, size_t outsize);
-
- /* create another compressor just like this one, i.e.
- with the exact same settings */
- compressor_t *(*create_copy)(compressor_t *cmp);
-
- void (*destroy)(compressor_t *stream);
-};
-
-bool compressor_exists(E_SQFS_COMPRESSOR id);
-
-/* block_size is the configured block size for the SquashFS image. Needed
- by some compressors to set internal defaults. */
-compressor_t *compressor_create(E_SQFS_COMPRESSOR id, bool compress,
- size_t block_size, char *options);
-
-void compressor_print_help(E_SQFS_COMPRESSOR id);
-
-void compressor_print_available(void);
-
-E_SQFS_COMPRESSOR compressor_get_default(void);
-
-const char *compressor_name_from_id(E_SQFS_COMPRESSOR id);
-
-int compressor_id_from_name(const char *name, E_SQFS_COMPRESSOR *out);
-
-#endif /* COMPRESS_H */