[PATCH v2 2/8] crypto/lzo: support decompress_noctx

[Joonsoo Kim]

lzo'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/lzo.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/crypto/lzo.c b/crypto/lzo.c
index 9ca516b..f1844dd 100644
--- a/crypto/lzo.c
+++ b/crypto/lzo.c
@@ -80,6 +80,22 @@ static int lzo_decompress(struct crypto_tfm *tfm, const u8 *src,
 
 }
 
+static int lzo_decompress_noctx(const u8 *src, unsigned int slen,
+				u8 *dst, unsigned int *dlen)
+{
+	int err;
+	size_t tmp_len = *dlen; /* size_t(ulong) <-> uint on 64 bit */
+
+	err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
+
+	if (err != LZO_E_OK)
+		return -EINVAL;
+
+	*dlen = tmp_len;
+	return 0;
+
+}
+
 static struct crypto_alg alg = {
 	.cra_name		= "lzo",
 	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
@@ -91,7 +107,7 @@ static struct crypto_alg alg = {
 	.coa_compress 		= lzo_compress,
 	.coa_decompress		= lzo_decompress,
 	.coa_compress_noctx	= NULL,
-	.coa_decompress_noctx	= NULL } }
+	.coa_decompress_noctx	= lzo_decompress_noctx } }
 };
 
 static int __init lzo_mod_init(void)
-- 
1.9.1

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