| 1 | |
| 2 | |
| 3 | * Cryptographic API.
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| 4 |
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| 5 |
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| 6 | #include <crypto/internal/scompress.h>
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| 7 | #include <linux/init.h>
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| 8 | #include <linux/lzo.h>
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| 9 | #include <linux/module.h>
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| 10 | #include <linux/slab.h>
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| 11 |
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| 12 | static void *lzorle_alloc_ctx(void)
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| 13 | {
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| 14 | void *ctx;
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| 15 |
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| 16 | ctx = kvmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);
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| 17 | if (!ctx)
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| 18 | return ERR_PTR(-ENOMEM);
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| 19 |
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| 20 | return ctx;
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| 21 | }
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| 22 |
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| 23 | static void lzorle_free_ctx(void *ctx)
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| 24 | {
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| 25 | kvfree(ctx);
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| 26 | }
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| 27 |
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| 28 | static int __lzorle_compress(const u8 *src, unsigned int slen,
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| 29 | u8 *dst, unsigned int *dlen, void *ctx)
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| 30 | {
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| 31 | size_t tmp_len = *dlen;
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| 32 | int err;
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| 33 |
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| 34 | err = lzorle1x_1_compress_safe(src, slen, dst, &tmp_len, ctx);
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| 35 |
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| 36 | if (err != LZO_E_OK)
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| 37 | return -EINVAL;
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| 38 |
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| 39 | *dlen = tmp_len;
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| 40 | return 0;
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| 41 | }
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| 42 |
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| 43 | static int lzorle_scompress(struct crypto_scomp *tfm, const u8 *src,
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| 44 | unsigned int slen, u8 *dst, unsigned int *dlen,
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| 45 | void *ctx)
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| 46 | {
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| 47 | return __lzorle_compress(src, slen, dst, dlen, ctx);
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| 48 | }
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| 49 |
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| 50 | static int __lzorle_decompress(const u8 *src, unsigned int slen,
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| 51 | u8 *dst, unsigned int *dlen)
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| 52 | {
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| 53 | int err;
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| 54 | size_t tmp_len = *dlen;
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| 55 |
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| 56 | err = lzo1x_decompress_safe(src, slen, dst, &tmp_len);
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| 57 |
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| 58 | if (err != LZO_E_OK)
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| 59 | return -EINVAL;
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| 60 |
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| 61 | *dlen = tmp_len;
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| 62 | return 0;
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| 63 | }
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| 64 |
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| 65 | static int lzorle_sdecompress(struct crypto_scomp *tfm, const u8 *src,
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| 66 | unsigned int slen, u8 *dst, unsigned int *dlen,
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| 67 | void *ctx)
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| 68 | {
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| 69 | return __lzorle_decompress(src, slen, dst, dlen);
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| 70 | }
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| 71 |
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| 72 | static struct scomp_alg scomp = {
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| 73 | .streams = {
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| 74 | .alloc_ctx = lzorle_alloc_ctx,
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| 75 | .free_ctx = lzorle_free_ctx,
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| 76 | },
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| 77 | .compress = lzorle_scompress,
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| 78 | .decompress = lzorle_sdecompress,
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| 79 | .base = {
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| 80 | .cra_name = "lzo-rle",
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| 81 | .cra_driver_name = "lzo-rle-scomp",
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| 82 | .cra_module = THIS_MODULE,
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| 83 | }
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| 84 | };
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| 85 |
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| 86 | static int __init lzorle_mod_init(void)
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| 87 | {
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| 88 | return crypto_register_scomp(&scomp);
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| 89 | }
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| 90 |
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| 91 | static void __exit lzorle_mod_fini(void)
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| 92 | {
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| 93 | crypto_unregister_scomp(&scomp);
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| 94 | }
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| 95 |
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| 96 | module_init(lzorle_mod_init);
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| 97 | module_exit(lzorle_mod_fini);
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| 98 |
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| 99 | MODULE_LICENSE("GPL");
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| 100 | MODULE_DESCRIPTION("LZO-RLE Compression Algorithm");
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| 101 | MODULE_ALIAS_CRYPTO("lzo-rle");
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