// SPDX-License-Identifier: GPL-2.0-or-later

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/lzo.h>

#include "backend_lzo.h"

static void lzo_release_params(struct zcomp_params *params)
{
}

static int lzo_setup_params(struct zcomp_params *params)
{
        return 0;
}

static int lzo_create(struct zcomp_params *params, struct zcomp_ctx *ctx)
{
        ctx->context = kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
        if (!ctx->context)
                return -ENOMEM;
        return 0;
}

static void lzo_destroy(struct zcomp_ctx *ctx)
{
        kfree(ctx->context);
}

static int lzo_compress(struct zcomp_params *params, struct zcomp_ctx *ctx,
                        struct zcomp_req *req)
{
        int ret;

        ret = lzo1x_1_compress(req->src, req->src_len, req->dst,
                               &req->dst_len, ctx->context);
        return ret == LZO_E_OK ? 0 : ret;
}

static int lzo_decompress(struct zcomp_params *params, struct zcomp_ctx *ctx,
                          struct zcomp_req *req)
{
        int ret;

        ret = lzo1x_decompress_safe(req->src, req->src_len,
                                    req->dst, &req->dst_len);
        return ret == LZO_E_OK ? 0 : ret;
}

const struct zcomp_ops backend_lzo = {
        .compress       = lzo_compress,
        .decompress     = lzo_decompress,
        .create_ctx     = lzo_create,
        .destroy_ctx    = lzo_destroy,
        .setup_params   = lzo_setup_params,
        .release_params = lzo_release_params,
        .name           = "lzo",
};