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/*
* Copyright 1998-2025 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/objects.h>
#include <openssl/comp.h>
#include <openssl/err.h>
#include "comp_local.h"
COMP_CTX *COMP_CTX_new(COMP_METHOD *meth)
{
COMP_CTX *ret;
if (meth == NULL)
return NULL;
if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL)
return NULL;
ret->meth = meth;
if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
OPENSSL_free(ret);
ret = NULL;
}
return ret;
}
const COMP_METHOD *COMP_CTX_get_method(const COMP_CTX *ctx)
{
return ctx->meth;
}
int COMP_get_type(const COMP_METHOD *meth)
{
if (meth == NULL)
return NID_undef;
return meth->type;
}
const char *COMP_get_name(const COMP_METHOD *meth)
{
if (meth == NULL)
return NULL;
return meth->name;
}
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) {
return -1;
}
ret = (int)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) {
return -1;
}
ret = (int)ctx->meth->expand(ctx, out, olen, in, ilen);
if (ret > 0) {
ctx->expand_in += ilen;
ctx->expand_out += ret;
}
return ret;
}
int COMP_CTX_get_type(const COMP_CTX* comp)
{
return comp->meth ? comp->meth->type : NID_undef;
}
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