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// SPDX-License-Identifier: GPL-2.0-or-later
#define pr_fmt(fmt) "deflate: " fmt
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/zlib.h>
#include "backend_deflate.h"
/* Use the same value as crypto API */
#define DEFLATE_DEF_WINBITS (-11)
#define DEFLATE_DEF_MEMLEVEL MAX_MEM_LEVEL
struct deflate_ctx {
struct z_stream_s cctx;
struct z_stream_s dctx;
};
static void deflate_release_params(struct zcomp_params *params)
{
}
static int deflate_setup_params(struct zcomp_params *params)
{
if (params->dict_sz) {
pr_err("dictionary is not supported\n");
return -EOPNOTSUPP;
}
if (params->level == ZCOMP_PARAM_NOT_SET) {
params->level = Z_DEFAULT_COMPRESSION;
} else if (params->level < Z_DEFAULT_COMPRESSION ||
params->level > Z_BEST_COMPRESSION) {
pr_err("invalid compression level %d\n", params->level);
return -EINVAL;
}
if (params->deflate.winbits == ZCOMP_PARAM_NOT_SET) {
params->deflate.winbits = DEFLATE_DEF_WINBITS;
} else {
s32 wb = params->deflate.winbits;
if ((wb < -15 || wb > -9) && (wb < 9 || wb > 15)) {
pr_err("invalid winbits %d\n", wb);
return -EINVAL;
}
}
return 0;
}
static void deflate_destroy(struct zcomp_ctx *ctx)
{
struct deflate_ctx *zctx = ctx->context;
if (!zctx)
return;
if (zctx->cctx.workspace) {
zlib_deflateEnd(&zctx->cctx);
vfree(zctx->cctx.workspace);
}
if (zctx->dctx.workspace) {
zlib_inflateEnd(&zctx->dctx);
vfree(zctx->dctx.workspace);
}
kfree(zctx);
}
static int deflate_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
{
struct deflate_ctx *zctx;
size_t sz;
int ret;
zctx = kzalloc_obj(*zctx);
if (!zctx)
return -ENOMEM;
ctx->context = zctx;
sz = zlib_deflate_workspacesize(params->deflate.winbits, MAX_MEM_LEVEL);
zctx->cctx.workspace = vzalloc(sz);
if (!zctx->cctx.workspace)
goto error;
ret = zlib_deflateInit2(&zctx->cctx, params->level, Z_DEFLATED,
params->deflate.winbits, DEFLATE_DEF_MEMLEVEL,
Z_DEFAULT_STRATEGY);
if (ret != Z_OK)
goto error;
sz = zlib_inflate_workspacesize();
zctx->dctx.workspace = vzalloc(sz);
if (!zctx->dctx.workspace)
goto error;
ret = zlib_inflateInit2(&zctx->dctx, params->deflate.winbits);
if (ret != Z_OK)
goto error;
return 0;
error:
deflate_destroy(ctx);
return -EINVAL;
}
static int deflate_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
struct zcomp_req *req)
{
struct deflate_ctx *zctx = ctx->context;
struct z_stream_s *deflate;
int ret;
deflate = &zctx->cctx;
ret = zlib_deflateReset(deflate);
if (ret != Z_OK)
return -EINVAL;
deflate->next_in = (u8 *)req->src;
deflate->avail_in = req->src_len;
deflate->next_out = (u8 *)req->dst;
deflate->avail_out = req->dst_len;
ret = zlib_deflate(deflate, Z_FINISH);
if (ret != Z_STREAM_END)
return -EINVAL;
req->dst_len = deflate->total_out;
return 0;
}
static int deflate_decompress(struct zcomp_params *params,
struct zcomp_ctx *ctx,
struct zcomp_req *req)
{
struct deflate_ctx *zctx = ctx->context;
struct z_stream_s *inflate;
int ret;
inflate = &zctx->dctx;
ret = zlib_inflateReset(inflate);
if (ret != Z_OK)
return -EINVAL;
inflate->next_in = (u8 *)req->src;
inflate->avail_in = req->src_len;
inflate->next_out = (u8 *)req->dst;
inflate->avail_out = req->dst_len;
ret = zlib_inflate(inflate, Z_SYNC_FLUSH);
if (ret != Z_STREAM_END)
return -EINVAL;
return 0;
}
const struct zcomp_ops backend_deflate = {
.compress = deflate_compress,
.decompress = deflate_decompress,
.create_ctx = deflate_create,
.destroy_ctx = deflate_destroy,
.setup_params = deflate_setup_params,
.release_params = deflate_release_params,
.name = "deflate",
};
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