crypto/comp/comp.c

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#include <openssl/comp.h>

#include <openssl/mem.h>


COMP_CTX *COMP_CTX_new(COMP_METHOD *meth) {
  COMP_CTX *ret;

  ret = OPENSSL_malloc(sizeof(COMP_CTX));
  if (ret == NULL) {
    return NULL;
  }

  memset(ret, 0, sizeof(COMP_CTX));
  ret->meth = meth;
  if (ret->meth->init != NULL && !ret->meth->init(ret)) {
    OPENSSL_free(ret);
    ret = NULL;
  }

  return ret;
}

void COMP_CTX_free(COMP_CTX *ctx) {
  if (ctx == NULL) {
    return;
  }

  if (ctx->meth->finish != NULL) {
    ctx->meth->finish(ctx);
  }

  OPENSSL_free(ctx);
}

int COMP_compress_block(COMP_CTX *ctx, uint8_t *out, size_t out_len,
                        uint8_t *in, size_t in_len) {
  int ret;
  if (ctx->meth->compress == NULL) {
    return -1;
  }
  ret = ctx->meth->compress(ctx, out, out_len, in, in_len);
  if (ret > 0) {
    ctx->compress_in += in_len;
    ctx->compress_out += ret;
  }
  return ret;
}

int COMP_expand_block(COMP_CTX *ctx, uint8_t *out, size_t out_len, uint8_t *in,
                      size_t in_len) {
  int ret;

  if (ctx->meth->expand == NULL) {
    return -1;
  }
  ret = ctx->meth->expand(ctx, out, out_len, in, in_len);
  if (ret > 0) {
    ctx->expand_in += in_len;
    ctx->expand_out += ret;
  }
  return ret;
}