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#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