Source of deflate.c - linux-imx - PHYTEC BitBucket (Stash)

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​
#define DEFLATE_DEF_LEVEL       Z_DEFAULT_COMPRESSION
#define DEFLATE_DEF_WINBITS     11
#define DEFLATE_DEF_MEMLEVEL        MAX_MEM_LEVEL
​
struct deflate_ctx {
    struct z_stream_s comp_stream;
    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;
    }
out:
    return ret;
out_free:
    vfree(stream->workspace);
    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;
​
    stream->workspace = vzalloc(zlib_inflate_workspacesize());
    if (!stream->workspace) {
        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;
    }
out:
    return ret;
out_free:
    vfree(stream->workspace);
    goto out;
}
Show more
    zlib_deflateEnd(&ctx->comp_stream);
    vfree(ctx->comp_stream.workspace);
}
​
static void deflate_decomp_exit(struct deflate_ctx *ctx)
{
    zlib_inflateEnd(&ctx->decomp_stream);
    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;
​
    ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
    if (!ctx)
        return ERR_PTR(-ENOMEM);
​
    ret = __deflate_init(ctx);
    ret = __deflate_init(ctx, format);
    if (ret) {
        kfree(ctx);
        return ERR_PTR(ret);
    }
​
    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)
{
    deflate_comp_exit(ctx);
    deflate_decomp_exit(ctx);
}
​
static void deflate_free_ctx(struct crypto_scomp *tfm, void *ctx)
{
Show more
    .cra_flags      = CRYPTO_ALG_TYPE_COMPRESS,
    .cra_ctxsize        = sizeof(struct deflate_ctx),
    .cra_module     = THIS_MODULE,
    .cra_init       = deflate_init,
    .cra_exit       = deflate_exit,
    .cra_u          = { .compress = {
    .coa_compress       = deflate_compress,
    .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,
    .decompress     = deflate_sdecompress,
    .base           = {
        .cra_name   = "deflate",
        .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)
{
    int ret;
​
    ret = crypto_register_alg(&alg);
    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;
    }
​
    return ret;
}
​
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);
module_exit(deflate_mod_fini);
​
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Deflate Compression Algorithm for IPCOMP");
MODULE_AUTHOR("James Morris <jmorris@intercode.com.au>");
MODULE_ALIAS_CRYPTO("deflate");