comp.h

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#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 );

/* 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. */

/* Reason codes. */

#ifdef  __cplusplus
}
#endif
#endif