Re: [PATCH v2 4/8] crypto/lz4hc: support decompress_noctx

From	Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH v2 4/8] crypto/lz4hc: support decompress_noctx
Date	2015-08-27 04:00 +0200
Message-ID	<q1UDT-6OO-1@gated-at.bofh.it> (permalink)
References	<pZrG1-5if-5@gated-at.bofh.it> <pZrG2-5if-21@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On (08/20/15 15:35), Joonsoo Kim wrote:
> 
> lz4hc'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@lge.com>
> ---
>  crypto/lz4hc.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/crypto/lz4hc.c b/crypto/lz4hc.c
> index bcf0baa..a529620 100644
> --- a/crypto/lz4hc.c
> +++ b/crypto/lz4hc.c
> @@ -76,6 +76,21 @@ static int lz4hc_decompress_crypto(struct crypto_tfm *tfm, const u8 *src,
>  	return err;
>  }
>  
> +static int lz4hc_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 lz4hc_decompress_noctx(const u8 *src, unsigned int slen,
				u8 *dst, unsigned int *dlen)
{
	return lz4hc_decompress_crypto(NULL, ....);
}

?

	-ss

>  static struct crypto_alg alg_lz4hc = {
>  	.cra_name		= "lz4hc",
>  	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
> @@ -88,7 +103,7 @@ static struct crypto_alg alg_lz4hc = {
>  	.coa_compress		= lz4hc_compress_crypto,
>  	.coa_decompress		= lz4hc_decompress_crypto,
>  	.coa_compress_noctx	= NULL,
> -	.coa_decompress_noctx	= NULL } }
> +	.coa_decompress_noctx	= lz4hc_decompress_noctx } }
>  };
>  
>  static int __init lz4hc_mod_init(void)
> -- 
> 1.9.1
> 
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[PATCH v2 4/8] crypto/lz4hc: support decompress_noctx Joonsoo Kim <js1304@gmail.com> - 2015-08-20 08:40 +0200
  Re: [PATCH v2 4/8] crypto/lz4hc: support decompress_noctx Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com> - 2015-08-27 04:00 +0200

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