linux-kernel - Re: [PATCH v2 3/8] crypyo/lz4: support decompress

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Date:	Thu, 27 Aug 2015 10:56:19 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Joonsoo Kim <js1304@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 3/8] crypyo/lz4: support decompress_noctx

On (08/20/15 15:34), Joonsoo Kim wrote:
> lz4's decompression doesn't requires any scratch buffer so
> it doesn't need tfm context. Hence, it can support
> crypto compression noctx API and this patch implements it.
> 
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> ---
>  crypto/lz4.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/crypto/lz4.c b/crypto/lz4.c
> index 1848435..aa23da3 100644
> --- a/crypto/lz4.c
> +++ b/crypto/lz4.c
> @@ -76,6 +76,21 @@ static int lz4_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
>  	return err;
>  }
>  
> +static int lz4_decompress_noctx(const u8 *src, unsigned int slen,
> +				u8 *dst, unsigned int *dlen)
> +{
> +	int err;
> +	size_t tmp_len = *dlen;
> +	size_t __slen = slen;
> +
> +	err = lz4_decompress_unknownoutputsize(src, __slen, dst, &tmp_len);
> +	if (err < 0)
> +		return -EINVAL;
> +
> +	*dlen = tmp_len;
> +	return err;
> +}
> +

same,

static int lz4_decompress_noctx(const u8 *src, unsigned int slen,
				u8 *dst, unsigned int *dlen)
{
	return lz4_decompress_crypto(NULL, ....);
}

?

>  static struct crypto_alg alg_lz4 = {
>  	.cra_name		= "lz4",
>  	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
> @@ -88,7 +103,7 @@ static struct crypto_alg alg_lz4 = {
>  	.coa_compress		= lz4_compress_crypto,
>  	.coa_decompress		= lz4_decompress_crypto,
>  	.coa_compress_noctx	= NULL,
> -	.coa_decompress_noctx	= NULL } }
> +	.coa_decompress_noctx	= lz4_decompress_noctx } }
>  };
>  
>  static int __init lz4_mod_init(void)
> -- 
> 1.9.1
> 
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