This patch implements an scomp backend for the 842 compression algorithm.
This way, 842 is exposed through the acomp api.
Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@xxxxxxxxx>
---
crypto/842.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
crypto/Kconfig | 1 +
2 files changed, 80 insertions(+), 3 deletions(-)
diff --git a/crypto/842.c b/crypto/842.c
index 98e387e..a433ac3 100644
--- a/crypto/842.c
+++ b/crypto/842.c
@@ -31,11 +31,46 @@
#include <linux/module.h>
#include <linux/crypto.h>
#include <linux/sw842.h>
+#include <crypto/internal/scompress.h>
struct crypto842_ctx {
- char wmem[SW842_MEM_COMPRESS]; /* working memory for compress */
+ void *wmem; /* working memory for compress */
};
+static void *crypto842_alloc_ctx(struct crypto_scomp *tfm)
+{
+ void *ctx;
+
+ ctx = kmalloc(SW842_MEM_COMPRESS, GFP_KERNEL);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+
+ return ctx;
+}
+
+static int crypto842_init(struct crypto_tfm *tfm)
+{
+ struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ ctx->wmem = crypto842_alloc_ctx(NULL);
+ if (IS_ERR(ctx->wmem))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void crypto842_free_ctx(struct crypto_scomp *tfm, void *ctx)
+{
+ kfree(ctx);
+}
+
+static void crypto842_exit(struct crypto_tfm *tfm)
+{
+ struct crypto842_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ crypto842_free_ctx(NULL, ctx->wmem);
+}
+
static int crypto842_compress(struct crypto_tfm *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
@@ -45,6 +80,13 @@ static int crypto842_compress(struct crypto_tfm *tfm,
return sw842_compress(src, slen, dst, dlen, ctx->wmem);
}
+static int crypto842_scompress(struct crypto_scomp *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
+{
+ return sw842_compress(src, slen, dst, dlen, ctx);
+}
+
static int crypto842_decompress(struct crypto_tfm *tfm,
const u8 *src, unsigned int slen,
u8 *dst, unsigned int *dlen)
@@ -52,27 +94,61 @@ static int crypto842_decompress(struct crypto_tfm *tfm,
return sw842_decompress(src, slen, dst, dlen);
}
+static int crypto842_sdecompress(struct crypto_scomp *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int *dlen, void *ctx)
+{
+ return sw842_decompress(src, slen, dst, dlen);
+}
+
static struct crypto_alg alg = {
.cra_name = "842",
.cra_driver_name = "842-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
- .cra_ctxsize = sizeof(struct crypto842_ctx),
.cra_module = THIS_MODULE,
+ .cra_init = crypto842_init,
+ .cra_exit = crypto842_exit,
.cra_u = { .compress = {
.coa_compress = crypto842_compress,
.coa_decompress = crypto842_decompress } }
};
+static struct scomp_alg scomp = {
+ .alloc_ctx = crypto842_alloc_ctx,
+ .free_ctx = crypto842_free_ctx,
+ .compress = crypto842_scompress,
+ .decompress = crypto842_sdecompress,
+ .base = {
+ .cra_name = "842",
+ .cra_driver_name = "842-scomp",
+ .cra_priority = 100,
+ .cra_module = THIS_MODULE,
+ }
+};
+
static int __init crypto842_mod_init(void)
{
- return crypto_register_alg(&alg);
+ int ret;
+
+ ret = crypto_register_alg(&alg);
+ if (ret)
+ return ret;
+
+ ret = crypto_register_scomp_qdecomp(&scomp);
+ if (ret) {
+ crypto_unregister_alg(&alg);
+ return ret;
+ }
+
+ return ret;
}
module_init(crypto842_mod_init);
static void __exit crypto842_mod_exit(void)
{
crypto_unregister_alg(&alg);
+ crypto_unregister_scomp(&scomp);
}
module_exit(crypto842_mod_exit);
diff --git a/crypto/Kconfig b/crypto/Kconfig
index 59570da..09c88ba 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1522,6 +1522,7 @@ config CRYPTO_LZO
config CRYPTO_842
tristate "842 compression algorithm"
select CRYPTO_ALGAPI
+ select CRYPTO_ACOMP2
select 842_COMPRESS
select 842_DECOMPRESS
help
--
1.7.4.1
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