[PATCH v2 3/8] crypyo/lz4: support decompress_noctx

[Joonsoo Kim]

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@xxxxxxx>
---
 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

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