comp.h

#ifndef HEADER_COMP_H
#define HEADER_COMP_H

#include <openssl/crypto.h>

#ifdef  __cplusplus
extern "C" {
#endif

typedef struct comp_ctx_st COMP_CTX;

typedef 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);
    } COMP_METHOD;

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