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/* $OpenBSD: comp.h,v 1.8 2014/11/03 16:58:28 tedu Exp $ */
#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
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
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