xref: /third_party/openssl/crypto/comp/comp_lib.c (revision e1051a39) 
1/*
2 * Copyright 1998-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <openssl/objects.h>
14#include <openssl/comp.h>
15#include <openssl/err.h>
16#include "comp_local.h"
17
18COMP_CTX *COMP_CTX_new(COMP_METHOD *meth)
19{
20    COMP_CTX *ret;
21
22    if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) {
23        ERR_raise(ERR_LIB_COMP, ERR_R_MALLOC_FAILURE);
24        return NULL;
25    }
26    ret->meth = meth;
27    if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
28        OPENSSL_free(ret);
29        ret = NULL;
30    }
31    return ret;
32}
33
34const COMP_METHOD *COMP_CTX_get_method(const COMP_CTX *ctx)
35{
36    return ctx->meth;
37}
38
39int COMP_get_type(const COMP_METHOD *meth)
40{
41    return meth->type;
42}
43
44const char *COMP_get_name(const COMP_METHOD *meth)
45{
46    return meth->name;
47}
48
49void COMP_CTX_free(COMP_CTX *ctx)
50{
51    if (ctx == NULL)
52        return;
53    if (ctx->meth->finish != NULL)
54        ctx->meth->finish(ctx);
55
56    OPENSSL_free(ctx);
57}
58
59int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen,
60                        unsigned char *in, int ilen)
61{
62    int ret;
63    if (ctx->meth->compress == NULL) {
64        return -1;
65    }
66    ret = ctx->meth->compress(ctx, out, olen, in, ilen);
67    if (ret > 0) {
68        ctx->compress_in += ilen;
69        ctx->compress_out += ret;
70    }
71    return ret;
72}
73
74int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen,
75                      unsigned char *in, int ilen)
76{
77    int ret;
78
79    if (ctx->meth->expand == NULL) {
80        return -1;
81    }
82    ret = ctx->meth->expand(ctx, out, olen, in, ilen);
83    if (ret > 0) {
84        ctx->expand_in += ilen;
85        ctx->expand_out += ret;
86    }
87    return ret;
88}
89
90int COMP_CTX_get_type(const COMP_CTX* comp)
91{
92    return comp->meth ? comp->meth->type : NID_undef;
93}
94