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authorGiovanni Cabiddu <giovanni.cabiddu@intel.com>2017-04-21 21:54:30 +0100
committerHerbert Xu <herbert@gondor.apana.org.au>2017-04-24 18:11:08 +0800
commita368f43d6e3a001e684e9191a27df384fbff12f5 (patch)
tree08607bdb8d53d1c05825d71581ae4d4ad5f1e58f /crypto/deflate.c
parentcrypto: scomp - allow registration of multiple scomps (diff)
downloadlinux-dev-a368f43d6e3a001e684e9191a27df384fbff12f5.tar.xz
linux-dev-a368f43d6e3a001e684e9191a27df384fbff12f5.zip
crypto: scomp - add support for deflate rfc1950 (zlib)
Add scomp backend for zlib-deflate compression algorithm. This backend outputs data using the format defined in rfc1950 (raw deflate surrounded by zlib header and footer). Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to '')
-rw-r--r--crypto/deflate.c61
1 files changed, 44 insertions, 17 deletions
diff --git a/crypto/deflate.c b/crypto/deflate.c
index f942cb391890..94ec3b36a8e8 100644
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -43,20 +43,24 @@ struct deflate_ctx {
struct z_stream_s decomp_stream;
};
-static int deflate_comp_init(struct deflate_ctx *ctx)
+static int deflate_comp_init(struct deflate_ctx *ctx, int format)
{
int ret = 0;
struct z_stream_s *stream = &ctx->comp_stream;
stream->workspace = vzalloc(zlib_deflate_workspacesize(
- -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL));
+ MAX_WBITS, MAX_MEM_LEVEL));
if (!stream->workspace) {
ret = -ENOMEM;
goto out;
}
- ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
- -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL,
- Z_DEFAULT_STRATEGY);
+ if (format)
+ ret = zlib_deflateInit(stream, 3);
+ else
+ ret = zlib_deflateInit2(stream, DEFLATE_DEF_LEVEL, Z_DEFLATED,
+ -DEFLATE_DEF_WINBITS,
+ DEFLATE_DEF_MEMLEVEL,
+ Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
@@ -68,7 +72,7 @@ out_free:
goto out;
}
-static int deflate_decomp_init(struct deflate_ctx *ctx)
+static int deflate_decomp_init(struct deflate_ctx *ctx, int format)
{
int ret = 0;
struct z_stream_s *stream = &ctx->decomp_stream;
@@ -78,7 +82,10 @@ static int deflate_decomp_init(struct deflate_ctx *ctx)
ret = -ENOMEM;
goto out;
}
- ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
+ if (format)
+ ret = zlib_inflateInit(stream);
+ else
+ ret = zlib_inflateInit2(stream, -DEFLATE_DEF_WINBITS);
if (ret != Z_OK) {
ret = -EINVAL;
goto out_free;
@@ -102,21 +109,21 @@ static void deflate_decomp_exit(struct deflate_ctx *ctx)
vfree(ctx->decomp_stream.workspace);
}
-static int __deflate_init(void *ctx)
+static int __deflate_init(void *ctx, int format)
{
int ret;
- ret = deflate_comp_init(ctx);
+ ret = deflate_comp_init(ctx, format);
if (ret)
goto out;
- ret = deflate_decomp_init(ctx);
+ ret = deflate_decomp_init(ctx, format);
if (ret)
deflate_comp_exit(ctx);
out:
return ret;
}
-static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
+static void *gen_deflate_alloc_ctx(struct crypto_scomp *tfm, int format)
{
struct deflate_ctx *ctx;
int ret;
@@ -125,7 +132,7 @@ static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
if (!ctx)
return ERR_PTR(-ENOMEM);
- ret = __deflate_init(ctx);
+ ret = __deflate_init(ctx, format);
if (ret) {
kfree(ctx);
return ERR_PTR(ret);
@@ -134,11 +141,21 @@ static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
return ctx;
}
+static void *deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+ return gen_deflate_alloc_ctx(tfm, 0);
+}
+
+static void *zlib_deflate_alloc_ctx(struct crypto_scomp *tfm)
+{
+ return gen_deflate_alloc_ctx(tfm, 1);
+}
+
static int deflate_init(struct crypto_tfm *tfm)
{
struct deflate_ctx *ctx = crypto_tfm_ctx(tfm);
- return __deflate_init(ctx);
+ return __deflate_init(ctx, 0);
}
static void __deflate_exit(void *ctx)
@@ -272,7 +289,7 @@ static struct crypto_alg alg = {
.coa_decompress = deflate_decompress } }
};
-static struct scomp_alg scomp = {
+static struct scomp_alg scomp[] = { {
.alloc_ctx = deflate_alloc_ctx,
.free_ctx = deflate_free_ctx,
.compress = deflate_scompress,
@@ -282,7 +299,17 @@ static struct scomp_alg scomp = {
.cra_driver_name = "deflate-scomp",
.cra_module = THIS_MODULE,
}
-};
+}, {
+ .alloc_ctx = zlib_deflate_alloc_ctx,
+ .free_ctx = deflate_free_ctx,
+ .compress = deflate_scompress,
+ .decompress = deflate_sdecompress,
+ .base = {
+ .cra_name = "zlib-deflate",
+ .cra_driver_name = "zlib-deflate-scomp",
+ .cra_module = THIS_MODULE,
+ }
+} };
static int __init deflate_mod_init(void)
{
@@ -292,7 +319,7 @@ static int __init deflate_mod_init(void)
if (ret)
return ret;
- ret = crypto_register_scomp(&scomp);
+ ret = crypto_register_scomps(scomp, ARRAY_SIZE(scomp));
if (ret) {
crypto_unregister_alg(&alg);
return ret;
@@ -304,7 +331,7 @@ static int __init deflate_mod_init(void)
static void __exit deflate_mod_fini(void)
{
crypto_unregister_alg(&alg);
- crypto_unregister_scomp(&scomp);
+ crypto_unregister_scomps(scomp, ARRAY_SIZE(scomp));
}
module_init(deflate_mod_init);