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// SPDX-License-Identifier: GPL-2.0+ OR Apache-2.0
/*
* Copyright (C) 2023, Alibaba Cloud
* Copyright (C) 2023, Gao Xiang <xiang@kernel.org>
*/
#include "erofs/internal.h"
#include "erofs/print.h"
#include "erofs/config.h"
#include "compressor.h"
#include "erofs/atomic.h"
void *kite_deflate_init(int level, unsigned int dict_size);
void kite_deflate_end(void *s);
int kite_deflate_destsize(void *s, const u8 *in, u8 *out,
unsigned int *srcsize, unsigned int target_dstsize);
static int deflate_compress_destsize(const struct erofs_compress *c,
const void *src, unsigned int *srcsize,
void *dst, unsigned int dstsize)
{
int rc = kite_deflate_destsize(c->private_data, src, dst,
srcsize, dstsize);
if (rc <= 0)
return -EFAULT;
return rc;
}
static int compressor_deflate_exit(struct erofs_compress *c)
{
if (!c->private_data)
return -EINVAL;
kite_deflate_end(c->private_data);
return 0;
}
static int compressor_deflate_init(struct erofs_compress *c)
{
if (c->private_data) {
kite_deflate_end(c->private_data);
c->private_data = NULL;
}
c->private_data = kite_deflate_init(c->compression_level, c->dict_size);
if (IS_ERR_VALUE(c->private_data))
return PTR_ERR(c->private_data);
return 0;
}
static int erofs_compressor_deflate_setlevel(struct erofs_compress *c,
int compression_level)
{
if (compression_level < 0)
compression_level = erofs_compressor_deflate.default_level;
if (compression_level > erofs_compressor_deflate.best_level) {
erofs_err("invalid compression level %d", compression_level);
return -EINVAL;
}
c->compression_level = compression_level;
return 0;
}
static int erofs_compressor_deflate_setdictsize(struct erofs_compress *c,
u32 dict_size,
u32 pclustersize_max)
{
if (!dict_size)
dict_size = erofs_compressor_deflate.default_dictsize;
if (dict_size > erofs_compressor_deflate.max_dictsize) {
erofs_err("dictionary size %u is too large", dict_size);
return -EINVAL;
}
c->dict_size = dict_size;
return 0;
}
const struct erofs_compressor erofs_compressor_deflate = {
.default_level = 1,
.best_level = 9,
.default_dictsize = 1 << 15,
.max_dictsize = 1 << 15,
.init = compressor_deflate_init,
.exit = compressor_deflate_exit,
.setlevel = erofs_compressor_deflate_setlevel,
.setdictsize = erofs_compressor_deflate_setdictsize,
.compress_destsize = deflate_compress_destsize,
};
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