crypto/comp/comp_lib.c

   1 /* ====================================================================
   2  * Copyright (c) 1999-2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <openssl/objects.h>
  59 #include <openssl/comp.h>
  60 #include "comp_lcl.h"
  61
  62 COMP_CTX *COMP_CTX_new(COMP_METHOD *meth)
  63 {
  64     COMP_CTX *ret;
  65
  66     if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
  67         return (NULL);
  68     ret->meth = meth;
  69     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
  70         OPENSSL_free(ret);
  71         ret = NULL;
  72     }
  73     return (ret);
  74 }
  75
  76 const COMP_METHOD *COMP_CTX_get_method(const COMP_CTX *ctx)
  77 {
  78     return ctx->meth;
  79 }
  80
  81 int COMP_get_type(const COMP_METHOD *meth)
  82 {
  83     return meth->type;
  84 }
  85
  86 const char *COMP_get_name(const COMP_METHOD *meth)
  87 {
  88     return meth->name;
  89 }
  90
  91 void COMP_CTX_free(COMP_CTX *ctx)
  92 {
  93     if (ctx == NULL)
  94         return;
  95
  96     if (ctx->meth->finish != NULL)
  97         ctx->meth->finish(ctx);
  98
  99     OPENSSL_free(ctx);
 100 }
 101
 102 int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen,
 103                         unsigned char *in, int ilen)
 104 {
 105     int ret;
 106     if (ctx->meth->compress == NULL) {
 107         return (-1);
 108     }
 109     ret = ctx->meth->compress(ctx, out, olen, in, ilen);
 110     if (ret > 0) {
 111         ctx->compress_in += ilen;
 112         ctx->compress_out += ret;
 113     }
 114     return (ret);
 115 }
 116
 117 int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen,
 118                       unsigned char *in, int ilen)
 119 {
 120     int ret;
 121
 122     if (ctx->meth->expand == NULL) {
 123         return (-1);
 124     }
 125     ret = ctx->meth->expand(ctx, out, olen, in, ilen);
 126     if (ret > 0) {
 127         ctx->expand_in += ilen;
 128         ctx->expand_out += ret;
 129     }
 130     return (ret);
 131 }
 132
 133 int COMP_CTX_get_type(const COMP_CTX* comp)
 134 {
 135     return comp->meth ? comp->meth->type : NID_undef;
 136 }