From: Joonsoo Kim Subject: [PATCH v2 3/8] crypyo/lz4: support decompress_noctx Date: Thu, 20 Aug 2015 15:34:59 +0900 Message-ID: <1440052504-15442-4-git-send-email-iamjoonsoo.kim@lge.com> References: <1440052504-15442-1-git-send-email-iamjoonsoo.kim@lge.com> Cc: Minchan Kim , Nitin Gupta , Sergey Senozhatsky , linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, Herbert Xu , "David S. Miller" , Stephan Mueller , Joonsoo Kim To: Andrew Morton Return-path: In-Reply-To: <1440052504-15442-1-git-send-email-iamjoonsoo.kim@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org 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 --- 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; +} + 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