#ifndef HEADER_COMP_H
# define HEADER_COMP_H

# include <openssl/crypto.h>

# ifdef OPENSSL_NO_COMP
# error COMP is disabled.
# endif

#ifdef __cplusplus
extern "C" {
#endif

typedef struct comp_ctx_st COMP_CTX;

struct comp_method_st {
int type; /* NID for compression library */
const char *name; /* A text string to identify the library */
int (*init) (COMP_CTX *ctx);
void (*finish) (COMP_CTX *ctx);
int (*compress) (COMP_CTX *ctx,
unsigned char *out, unsigned int olen,
unsigned char *in, unsigned int ilen);
int (*expand) (COMP_CTX *ctx,
unsigned char *out, unsigned int olen,
unsigned char *in, unsigned int ilen);
/*
* The following two do NOTHING, but are kept for backward compatibility
*/
long (*ctrl) (void);
long (*callback_ctrl) (void);
};

struct comp_ctx_st {
COMP_METHOD *meth;
unsigned long compress_in;
unsigned long compress_out;
unsigned long expand_in;
unsigned long expand_out;
CRYPTO_EX_DATA ex_data;
};

COMP_CTX *COMP_CTX_new(COMP_METHOD *meth);
void COMP_CTX_free(COMP_CTX *ctx);
int COMP_compress_block(COMP_CTX *ctx, unsigned char *out, int olen,
unsigned char *in, int ilen);
int COMP_expand_block(COMP_CTX *ctx, unsigned char *out, int olen,
unsigned char *in, int ilen);
COMP_METHOD *COMP_rle(void);
COMP_METHOD *COMP_zlib(void);
void COMP_zlib_cleanup(void);

# ifdef HEADER_BIO_H
# ifdef ZLIB
BIO_METHOD *BIO_f_zlib(void);
# endif
# endif

/* BEGIN ERROR CODES */
/*
* The following lines are auto generated by the script mkerr.pl. Any changes
* made after this point may be overwritten when the script is next run.
*/
void ERR_load_COMP_strings(void);

/* Error codes for the COMP functions. */

/* Function codes. */
# define COMP_F_BIO_ZLIB_FLUSH 99
# define COMP_F_BIO_ZLIB_NEW 100
# define COMP_F_BIO_ZLIB_READ 101
# define COMP_F_BIO_ZLIB_WRITE 102

/* Reason codes. */
# define COMP_R_ZLIB_DEFLATE_ERROR 99
# define COMP_R_ZLIB_INFLATE_ERROR 100
# define COMP_R_ZLIB_NOT_SUPPORTED 101

#ifdef __cplusplus
}
#endif
#endif