source-engine/thirdparty/openssl/crypto/comp/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);
}