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199
SQUASHFS/squashfs-tools-4.4/squashfs-tools/zstd_wrapper.c
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199
SQUASHFS/squashfs-tools-4.4/squashfs-tools/zstd_wrapper.c
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/*
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* Copyright (c) 2017
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* Phillip Lougher <phillip@squashfs.org.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2,
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* or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* zstd_wrapper.c
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*
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* Support for ZSTD compression http://zstd.net
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <zstd.h>
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#include <zstd_errors.h>
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#include "squashfs_fs.h"
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#include "zstd_wrapper.h"
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#include "compressor.h"
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static int compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
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/*
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* This function is called by the options parsing code in mksquashfs.c
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* to parse any -X compressor option.
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*
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* This function returns:
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* >=0 (number of additional args parsed) on success
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* -1 if the option was unrecognised, or
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* -2 if the option was recognised, but otherwise bad in
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* some way (e.g. invalid parameter)
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*
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* Note: this function sets internal compressor state, but does not
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* pass back the results of the parsing other than success/failure.
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* The zstd_dump_options() function is called later to get the options in
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* a format suitable for writing to the filesystem.
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*/
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static int zstd_options(char *argv[], int argc)
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{
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return 1;
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}
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/*
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* This function is called by mksquashfs to dump the parsed
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* compressor options in a format suitable for writing to the
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* compressor options field in the filesystem (stored immediately
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* after the superblock).
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*
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* This function returns a pointer to the compression options structure
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* to be stored (and the size), or NULL if there are no compression
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* options.
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*/
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static void *zstd_dump_options(int block_size, int *size)
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{
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return NULL;
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}
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/*
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* This function is a helper specifically for the append mode of
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* mksquashfs. Its purpose is to set the internal compressor state
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* to the stored compressor options in the passed compressor options
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* structure.
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*
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* In effect this function sets up the compressor options
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* to the same state they were when the filesystem was originally
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* generated, this is to ensure on appending, the compressor uses
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* the same compression options that were used to generate the
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* original filesystem.
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*
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* Note, even if there are no compressor options, this function is still
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* called with an empty compressor structure (size == 0), to explicitly
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* set the default options, this is to ensure any user supplied
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* -X options on the appending mksquashfs command line are over-ridden.
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*
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* This function returns 0 on sucessful extraction of options, and -1 on error.
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*/
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static int zstd_extract_options(int block_size, void *buffer, int size)
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{
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struct zstd_comp_opts *comp_opts = buffer;
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if (size == 0) {
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/* Set default values */
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compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
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return 0;
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}
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/* we expect a comp_opts structure of sufficient size to be present */
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if (size < sizeof(*comp_opts))
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goto failed;
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SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
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if (comp_opts->compression_level < 1) {
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fprintf(stderr, "zstd: bad compression level in compression "
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"options structure\n");
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goto failed;
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}
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compression_level = comp_opts->compression_level;
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return 0;
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failed:
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fprintf(stderr, "zstd: error reading stored compressor options from "
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"filesystem!\n");
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return -1;
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}
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static void zstd_display_options(void *buffer, int size)
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{
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struct zstd_comp_opts *comp_opts = buffer;
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/* we expect a comp_opts structure of sufficient size to be present */
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if (size < sizeof(*comp_opts))
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goto failed;
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SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
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if (comp_opts->compression_level < 1) {
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fprintf(stderr, "zstd: bad compression level in compression "
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"options structure\n");
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goto failed;
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}
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printf("\tcompression-level %d\n", comp_opts->compression_level);
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return;
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failed:
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fprintf(stderr, "zstd: error reading stored compressor options from "
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"filesystem!\n");
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}
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/*
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* This function is called by mksquashfs to initialise the
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* compressor, before compress() is called.
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*
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* This function returns 0 on success, and -1 on error.
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*/
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static int zstd_init(void **strm, int block_size, int datablock)
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{
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return 0;
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}
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static int zstd_compress(void *strm, void *dest, void *src, int size,
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int block_size, int *error)
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{
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(void)strm;
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(void)dest;
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(void)src;
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(void)size;
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(void)block_size;
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(void)error;
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return 0;
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}
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static int zstd_uncompress(void *dest, void *src, int size, int outsize,
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int *error)
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{
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const size_t res = ZSTD_decompress(dest, outsize, src, size);
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if (ZSTD_isError(res)) {
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fprintf(stderr, "\t%d %d\n", outsize, size);
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*error = (int)ZSTD_getErrorCode(res);
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return -1;
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}
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return (int)res;
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}
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static void zstd_usage(void)
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{
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fprintf(stderr, "\t -Xcompression-level <compression-level>\n");
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}
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struct compressor zstd_comp_ops = {
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.init = zstd_init,
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.compress = zstd_compress,
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.uncompress = zstd_uncompress,
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.options = zstd_options,
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.dump_options = zstd_dump_options,
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.extract_options = zstd_extract_options,
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.display_options = zstd_display_options,
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.usage = zstd_usage,
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.id = ZSTD_COMPRESSION,
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.name = "zstd",
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.supported = 1
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};
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