comp_lib.c

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#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);
    }