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comp_lib.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include <openssl/comp.h>

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

      if ((ret=(COMP_CTX *)OPENSSL_malloc(sizeof(COMP_CTX))) == NULL)
            {
            /* ZZZZZZZZZZZZZZZZ */
            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, unsigned char *out, int olen,
           unsigned char *in, int ilen)
      {
      int ret;
      if (ctx->meth->compress == NULL)
            {
            /* ZZZZZZZZZZZZZZZZZ */
            return(-1);
            }
      ret=ctx->meth->compress(ctx,out,olen,in,ilen);
      if (ret > 0)
            {
            ctx->compress_in+=ilen;
            ctx->compress_out+=ret;
            }
      return(ret);
      }

int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen,
           unsigned char *in, int ilen)
      {
      int ret;

      if (ctx->meth->expand == NULL)
            {
            /* ZZZZZZZZZZZZZZZZZ */
            return(-1);
            }
      ret=ctx->meth->expand(ctx,out,olen,in,ilen);
      if (ret > 0)
            {
            ctx->expand_in+=ilen;
            ctx->expand_out+=ret;
            }
      return(ret);
      }

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