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crypto: scomp - add support for deflate rfc1950 (zlib)

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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>
This commit is contained in:
Giovanni Cabiddu
2017-04-21 21:54:30 +01:00
committed by Herbert Xu
parent 3de4f5e1a5
commit a368f43d6e
3 changed files with 129 additions and 17 deletions
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61
crypto/deflate.c
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@ -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);